Which term describes the conversion of substances into different substances? (1 point)
O ionic bonding
O fossilization
O chemical reaction
O photosynthesis
Answers
Chemical reaction is the term which describes the conversion of substances into different substances.
What is chemical reaction?Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical reactions:
1) inorganic reactions
2)organic reactions
3) biochemical reactions
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Related Questions
Why are there only two elements in the first period of the periodic table? (1 point)
A. Because only two electrons can fit in the first orbit around the nucleus, and each period on the table is organized by number of orbits
B. Because the first two elements both start with H and are grouped together
C. Because the next elements have other things in common and they need to be arranged together
D. Because each row increases in atomic mass by a specific number so anything over five is in the second
Answers
Answer:A. Because only two electrons can fit in the first orbit around the nucleus, and each period on the table is organized by number of orbits
Explanation: This is because the The periodic table of elements is designed according to the number of shells from up going down together with their increasing number of atomic numbers, Now only Hydrogen and Helium have one shell and are therefore the only two elements that should be placed in the first period .
Also note that in filling of their s-orbital, the maximum number of electrons that it can contain is 2 as in 1s²
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The ph of lemon juice is 2. 2. the ph of orange juice is 4. 2. the concentration of hydrogen ions in lemon juice is ________ the concentration of hydrogen ions in orange juice.
Answers
The pH of lemon juice is 2. 2. the ph of orange juice is 4. 2. the concentration of hydrogen ions in lemon juice is l0^-2.2 and 10^-4.2 the concentration of hydrogen ions in orange juice.
A metric for determining how basic or acidic a substance as well as solution is. The pH scale ranges from 0 to 14. A pH value of 7 was considered neutral on just this scale, meaning it was neither acidic or basic. It becomes more acidic if the pH value is below 7, and much more basic if the pH value is well above 7.
Calculation of pH :
pH can be calculated by using the formula:
[H +]= 10^-pH]....(i)
[H+] = l0^-2.2 (For lemon juice)
[H +]= 10^-pH
[H +]= 10^-4.2 (orange juice)
Although pH may appear to be an element according to a periodic chart, it is essentially a unit or measurement. Potential Hydrogen, but rather pH, is an acronym that indicates how so much hydrogen being present in liquids and also how active each hydrogen ion becomes.
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Suppose your hair grows at the rate 1/32 in. per day. find the rate at which it grows in nanometers per sec- ond. since the distance between atoms in a molecule is:_______
Answers
The rate at which it grows in nanometers per second is 9.19 nm/s.
A filamentous biomaterial, hair is primarily made of proteins, particularly keratin. Dermal follicles produce the protein filament known as hair. Animals can be identified in part by their hair. The human body is covered in follicles that generate thick terminal and fine vellus hair, with the exception of regions of glabrous skin. A healthy head of hair offers some warmth and ultraviolet radiation defence.
The given hair growth rate is 1/32 inch per day.
We must determine the growth rate in nanometers per second.
We know that
1 inch= 2.54x10-⁷ nm
1 day= 86400 s
Using the formula
1/32 inch / day= 1×2.54×10-⁷/32×86400
1/32 inch/day = 9.19 nm/s.
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can someone help me solve the questions below using the data table below PLEASEE
DATA TABLE:
Mass of flask and vinegar solution- 25.17g
Mass of flask- 15.12g
Volume of vinegar solution (in mL)- 10.00ml
Initial volume of NaOH (in mL)-0.00ml
Final volume of NaOH (in mL)-39.00ml
CALCULATIONS:
Mass of vinegar solution- 10.0503g
Volume of NaOH used in titration (in mL)-39.00ml
Answers
The molarity of NaOH solution is 0.114 M.
Given, Mass of flask and vinegar solution= 25.17 g.Mass of flask= 15.12 gVolume of vinegar solution (in mL)= 10.00 mlInitial volume of NaOH (in mL)= 0.00 mlFinal volume of NaOH (in mL)= 39.00 mlThe Mass of vinegar solution is 10.0503 g.The volume of NaOH used in titration is 39.00 ml.Let's calculate the molarity of the NaOH solution.First, calculate the moles of NaOH used in the reaction. Moles of NaOH = Molarity × Volume of NaOH (in L) Converting volume in mL to L,Volume of NaOH used = 39.00 mL = 39.00/1000 L = 0.0390 LThe molarity of NaOH solution is given by;Molarity of NaOH = Moles of NaOH / Volume of vinegar solution (in L)Converting volume in mL to L,Volume of vinegar solution = 10.00 mL = 10.00/1000 L = 0.0100 LNow, substituting the values; Molarity of NaOH = 0.114 M.
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what is the iupac name for the following? the line-angle structure has five carbon atoms in the chain, with a cl atom attached to the third (from left to right) carbon.
Answers
The IUPAC name for the line-angle structure with five carbon atoms in the chain and a Cl atom attached to the third (from left to right) carbon is 3-chloropentane.
The IUPAC naming system for organic compounds involves several steps, but some general principles must be followed.
The longest carbon chain is counted first, and the substituents are identified based on their position in the chain.
In the given structure, the longest chain contains five carbon atoms. The third carbon atom has a chlorine atom attached to it, making it a substituent.
The name of the substituent is added to the chain name as a prefix, thus giving the final name 3-chloropentane.
The IUPAC name of the given compound is 3-chloropentane. The common name for this structure is Chloroamyl.
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while water is boiling, it absorbs 2257 kj of heat per kilogram of water. this takes place at a constant temperature of 100°c. what is the entropy change of 10 kg of water while it boils? (be careful of your energy units). (1 point)
Answers
The entropy change is 6.051 x 10^4 J/K
Given:
mass of water = 10 kg
latent heat of boiling = 2257 kj
constant temperature = 100°c
To Find:
entropy change of 10 kg of water
Solution:
entropy change = mass*latent heat of boiling/temperature
= 10×2257×1000/(273+100) K
= 22,570,000/373K = 6.051 x 10^4 J/K
Hence, entropy change is 6.051 x 10^4 J/K
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5. What is the difference between a reflected and a diffracted sound wave?
A. A reflected sound wave is absorbed by the medium. A diffracted sound wave changes
direction as it passes through an opening.
B. A diffracted sound wave bounces back to the place of origin. A reflected sound wave is
absorbed as it passes through an opening.
C. A reflected sound wave bounces back to the place of origin. A diffracted sound wave
changes direction as it passes through an opening.
D. A diffracted sound wave bounces back to the place of origin. A reflected sound wave
changes direction as it passes through an opening.
Answers
Answer:
Reflection involves a change in direction of waves when they bounce off a barrier; refraction of waves involves a change in the direction of waves as they pass from one medium to another; and diffraction involves a change in direction of waves as they pass through an opening or around a barrier in their path.
Explanation:
https://www.physicsclassroom.com/class/waves/Lesson-3/Reflection,-Refraction,-and-Diffraction#:~:text=Diffraction%20of%20Waves-,Reflection%20involves%20a%20change%20in%20direction%20of%20waves%20when%20they,a%20barrier%20in%20their%20path.
Reflection of sound wave differs from diffraction of sound wave in that a reflected sound wave bounces back to the place of origin while a diffracted sound wave changes direction as it passes through an opening.
What is reflection?Reflection is the bouncing back of a wave when it hits an obstacle along its path.
What is diffraction?Diffraction is the spreading out of a wave in a circular path as it passes through a tiny opening.
Therefore, the difference between reflection and diffraction is that a reflected sound wave bounces back to the place of origin while a diffracted sound wave changes direction as it passes through an opening.
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8. A saturated solution of Ag Croq has a silver-ion concentration of 1.3 x 10-4M. Which is the Ksp of Ag CrO 4?
O 1.3 x 10-4
O 3.9 x 10-12
O 6.5 x 10-5
O 1.1 x 10-12
Answers
Answer: The \(K_{sp}\) of \(AgCrO_{4}\) is \(1.1 \times 10^{-12}\).
Explanation:
Given: \([Ag^{+}] = 1.3 \times 10^{-4} M\)
The reaction equation will be written as follows.
\(Ag_{2}CrO_{4} \rightleftharpoons 2Ag^{+} + CrO^{2-}_{4}\)
This shows that the concentration of \(CrO^{2-}_{4}\) is half the concentration of \(Ag^{+}\) ion. So,
\([CrO^{2-}_{4}] = \frac{1.3 \times 10^{-4}}{2}\\= 0.65 \times 10^{-4} M\)
The expression for \(K_{sp}\) of this reaction is as follows.
\(K_{sp} = [Ag^{+}]^{2}[CrO^{2-}_{4}]\)
Substitute values into the above expression as follows.
\(K_{sp} = [Ag^{+}]^{2}[CrO^{2-}_{4}]\\= (1.3 \times 10^{-4})^{2} \times 0.65 \times 10^{-4}\\= 1.1 \times 10^{-12}\)
Thus, we can conclude that the \(K_{sp}\) of \(AgCrO_{4}\) is \(1.1 \times 10^{-12}\).
A charged plastic hair comb is shown to have a charge of 382nC. If it polarizes a piece of paper to an equal charge and is separated from it by 15 mm, what electrical force in newtons does the comb exert on the piece of paper to two significant digits?
Answers
The electrical force exerted by the comb on the piece of paper is about 5.84N.
We arrive at the answer by applying a basic law in the field of electrostatics, known as Coulomb's Law.
Coulomb's Law states two postulates about the electrostatic forces between bodies.
1. The Force between two charged bodies or particles is directly proportional to the product of the magnitude of charges.
F ∝ |Q₁*Q₂|
2. The same force is also inversely proportional to the square of the distance between the bodies.
F ∝ 1/R²
By combining the expression obtained through the postulates, we arrive at the following equation.
F = K(|Q₁*Q₂| / R²)
where K is called the electrostatic constant, equal to 9 * 10⁹ N·m²/C²
In the given question, if the piece of paper has also been polarized to the same amount of charge, it also holds a charge of 382nC. We can apply Coulomb's Law here to find the force between the comb and the paper.
F = 9 * 10⁹ * (382*382*10⁻¹⁸/15*15*10⁻⁶)
F = 9 *382²/225 *10⁻³
F = 5.836 N
Thus the force between the paper and the comb, mutually exerted on each other, is about 5.84N.
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what is the answer to this ?
Answers
Answer:
it is either d or c
Explanation:
Answer:
im pretty sure its 31
just add up the masses then divide by 3
The car has a rechargeable battery to drive it’s motor. The rechargeable battery provided a potential difference of 330 volts and can store up to 64 mega Jules it takes 8 hours for the battery to receive a full charge assume that the charging process is 100% efficient calculate the total charge the flows while the battery is being charged
Answers
The total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.
To calculate the total charge that flows while the battery is being charged, we can use the relationship between electrical energy, potential difference, and charge.
The electrical energy (E) stored in the battery is given as 64 mega Jules (64 MJ). The potential difference (V) provided by the battery is 330 volts. We know that the energy (E) is equal to the product of the potential difference (V) and the charge (Q):
E = V * Q
Since the charging process is 100% efficient, all the electrical energy supplied is stored in the battery. Therefore, we can rearrange the equation to solve for the charge (Q):
Q = E / V
Substituting the given values, we have:
Q = 64 MJ / 330 V
To perform the calculation, we need to convert mega Jules (MJ) to joules (J) since the SI unit of energy is joules. One mega Joule is equal to 1 million joules:
Q = (64 * 10^6 J) / 330 V
Calculating the division:
Q ≈ 193,939.39 Coulombs
Therefore, the total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.
This value represents the quantity of electric charge transferred during the charging process, and it indicates the amount of electricity that enters the battery.
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HELPPPPPPPPPPPPP ME PLSSSSSSSSSSS
This image shows a model of the rock cycle.
At point R, rocks melt underground to form magma. Which is another process that contributes to the formation of rock at point R?
compacting of sediments on the mountain
cooling as the lava runs down the mountain
weathering of the mountain from the environment
eroding of different rocks at the base of the mountain
Answers
Answer:
Option B: cooling as the lava runs down the mountain
Explanation:
The point R is basically at near the Earth's surface.
Now, we are told that rocks melt underground to form magma. This is a process of formation of igneous rocks. So, in formation of igneous rocks another process that will contribute to formation of rocks at point R is named cooling.
Cooling is a process where the larva runs down the mountain that makes magma hardened and makes it it turn into igneous rock.
Answer:
The answer is cooling as the lava runs down the mountain.
Explanation:
I took the test on Edge 2020 and got the answer right.
I've been stuck on this question
Answers
According to the question the reaction A+B→C+D is exothermic.
What is reaction?Reaction in chemistry is a process in which two or more substances interact to form a new substance. Chemical reactions involve the breaking of chemical bonds and the formation of new bonds. Chemical reactions are essential for the formation and breaking of molecules, and are responsible for the production of energy.
a) The reaction A+B→C+D is exothermic.
b) The AH for the forward reaction is the difference between the enthalpies of the products and the reactants. The AH for the backward reaction is the difference between the enthalpies of the reactants and the products.
c) X would represent the position of the activated complex on the graph.
d) The activation energy for the forward reaction is the difference between the enthalpies of the reactants and the activated complex. The activation energy for the backward reaction is the difference between the enthalpies of the products and the activated complex. The forward reaction is expected to be faster because it has a lower activation energy.
e) On the same set of axes, the graph would show a decrease in the activation energy with the use of a catalyst, resulting in a lower energy barrier and faster reaction rates.
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Which atom (magnesium or chlorine) is larger? _______________________(you should also be prepared to answer the question if asked for the smaller atom)3a. Explain why the atom is larger. Include the following terms in your answer: protons, electrons, shells or layers, columbic attractions
Answers
Answer:
The magnesium atom is larger.
Explanation:
The magnesium atom is larger because it is on the left side of the Periodic Table (period 3 and group 2) where the atomic radius is larger.
Atomic radius is the distance from the center of the nucleus of an atom to the most external electron shell.
The greater the columbic attractions, the closer the protons in the nucleus are to the electrons in the outer layers, making the size of the atom smaller.
a. Suppose your best fit line is: y = 7978x – 0.006. If your unknown sample has a %T of 68.0, what is the solution concentration? Show your work.
b. The sample above was obtained after 2.00 mL of the original 100-mL solution was diluted to 50.00 mL (Part II, Step 4) and 2.25 mL of this solution was diluted again with 5.25 mL of water to give 7.50 mL of total volume (Part III, Step 2). Working backwards, what was the original concentration of your unknown solution in the 100-mL flask? Show your work.
Answers
The solution concentration is approximately 0.008525, or 0.8525% (assuming the concentration is expressed as a percentage).
To determine the solution concentration using the given best fit line equation and %T value, we can rearrange the equation to solve for x, which represents the solution concentration.
The equation given is: y = 7978x - 0.006
Let's substitute %T = 68.0 for y in the equation:
68.0 = 7978x - 0.006
Now, solve for x by isolating it
7978x = 68.0 + 0.006
7978x = 68.006
x = 68.006 / 7978
x ≈ 0.008525
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What is the most likely explanation for the difference in average high temperatures in July for these two cities?
Answers
Answer:Ocean breezes keep coastal Galveston cooler than Del Rio, which is inland and exposed to southerly winds.
Explanation: inwards has winds and outwards doesn’t have winds just the coast.
complete the balanced molecular chemical equation for the reaction below. if no reaction occurs, write nr after the reaction arrow. kbr(aq) +cacl2(aq)->
Answers
The balanced molecular chemical equation for the reaction between potassium bromide (KBr) and calcium chloride (CaCl2) is: 2KBr(aq) + CaCl2(aq) -> 2KCl(aq) + CaBr2(aq).
To balance the equation, we need to ensure that the number of atoms of each element is the same on both sides of the reaction arrow.
Given: KBr(aq) + CaCl2(aq) ->
The number of potassium (K) atoms on the left side is 1, while there are 2 chlorine (Cl) atoms on the right side due to CaCl2. To balance the K atoms, we need to add a coefficient of 2 in front of KBr: 2KBr(aq) + CaCl2(aq) ->
Now, the number of potassium (K) and chlorine (Cl) atoms is balanced.
Next, we look at the bromine (Br) and calcium (Ca) atoms. There is 2 bromine (Br) atoms on the left side and 1 calcium (Ca) atom on the right side. To balance the Br atoms, we need to add a coefficient of 2 in front of CaBr2: 2KBr(aq) + CaCl2(aq) -> 2KCl(aq) + CaBr2(aq)
Now, the equation is balanced with respect to the number of atoms on both sides.
The balanced molecular chemical equation for the reaction between potassium bromide (KBr) and calcium chloride (CaCl2) is: 2KBr(aq) + CaCl2(aq) -> 2KCl(aq) + CaBr2(aq).
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Help plzzZZZZ I really need help with this
Answers
what is the bond order for a second-period diatomic particle containing five electrons in antibonding molecular orbitals and eight electrons in bonding molecular orbitals?
Answers
The bond order for a second-period diatomic particle containing five electrons in antibonding molecular orbitals and eight electrons in bonding molecular orbitals is 1.5
Bond order is defined as the number of electrons in bonding molecular orbitals minus the number of electrons in antibonding molecular orbitals divided by two. As a result, we may determine the bond order of this diatomic particle by the formula: Bond order = (number of bonding electrons - number of antibonding electrons) / 2
Bond order = (8 - 5) / 2
Bond order = 1.5.
This diatomic molecule, according to the bond order, is a stable molecule since the bond order is greater than 1, indicating that it is a double bond. The molecule has an overall bond strength that is greater than a single bond, but not as strong as a triple bond. So therefore he bond order for a second-period diatomic particle containing five electrons in antibonding molecular orbitals and eight electrons in bonding molecular orbitals is 1.5
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•••••PLEASE HELP!Determine the maximum amount of NaNO that was produced during the experiment. Explain how you determined this amount.
Answers
The maximum amount of NaNO₃ that can be produced during the experiment is 9 moles
How do i determine the maximum amount of NaNO₃ produced?First, we shall obtain the limiting reactant. Details below:
Al(NO₃)₃ + 3NaCl -> 3NaNO₃ + AlCl₃
From the balanced equation above,
1 mole of Al(NO₃)₃ reacted with 3 moles of NaCl
Therefore,
4 moles of Al(NO₃)₃ will react with = 4 × 3 = 12 moles of NaCl
Thus, we can see that a higher amount of NaCl is needed to react with 4 moles of Al(NO₃)₃. Therefore, NaCl is the limiting reactant.
Finally, we can determine the maximum amount of NaNO₃ produced. Details below:
From the balanced equation above,
3 moles of NaCl reacted to produce 3 mole of NaNO₃
Therefore,
9 moles of NaCl will also react to produce 9 moles of NaNO₃
Thus, the maximum amount of NaNO₃ produced is 9 moles
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Which one of the following does not give butanoic acid when hydrolyzed with aqueous hydrochloric acid? 0 A) CH3CH2CH CCl B) CH3CH CH CH C) CH,CH2CH2COCH3 D) CH3CH CH2CN(CH3)2 A) A B) B c) C D) D
Answers
The compound that does not give butanoic acid when hydrolyzed with aqueous hydrochloric acid is CH₃CH CH CH. Option B is correct.
Hydrolysis is a chemical reaction in which water is used to break down a compound into its constituent parts. When a compound is hydrolyzed with aqueous hydrochloric acid, the hydroxide ion (OH-) from water reacts with the functional group of the compound to form an alcohol. The chloride ion (Cl-) from hydrochloric acid then reacts with the alcohol to form a chloride salt, while the hydrogen ion (H+) from hydrochloric acid reacts with the functional group to form a carboxylic acid (-COOH).
CH₃CH₂CCl would give butanoic acid upon hydrolysis as the C-Cl bond would be cleaved and replaced with -COOH group. CH₃CH₂CH₂COCH₃ would also give butanoic acid upon hydrolysis as the ester linkage would be cleaved and replaced with -COOH group. CH₃CH CH₂CN(CH₃)2 would give butanoic acid upon hydrolysis as the nitrile group would be converted to -COOH group. However, CH₃CH CH CH cannot give butanoic acid upon hydrolysis as it does not contain any functional group which can be converted to -COOH group. Option B is correct.
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Why do we use the metric system in science?
Answers
we use the metric system in science just for the simple fact that it is a common unit practice around the world. in science we must use the same system, because it would cause confusion or mistakes.
hope this helps good luck! :)
If a weak diprotic acid deprotonates, the resulting species will be which of the following? Choose the best description below.Select the correct answer below.an acida baseLast updated: 8/6both an acid and a basedepends on the substance
Answers
The resulting species when a weak diprotic acid deprotonates will depend on the specific substance. It could be both an acid and a base or only an acid or a base. Therefore, Option C is correct.
When a weak diprotic acid deprotonates, it can form different species depending on the specific acid. A diprotic acid is capable of donating two protons (H+) per molecule.
If the first proton is completely removed from the diprotic acid, it will form a monoprotic base. In this case, the resulting species will act as a base because it can accept a proton (H+). This species can be described as a base.
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Why the small community of Mount Laguna, California, just 55 miles from San Diego much colder than San Diego ?
Answers
Answer: It all boils down to the two cities' proximity to the Pacific Ocean, along with wind currents and geographical location
Explanation: It is known throughout the whole scientific community that a body of water near a city produces very stable temperatures throughout the year with small dips. When it is summer, instead of San Diego boiling in the heat, the Pacific absorbs most of this heat, making the heat in the city tolerable (almost), this makes the ocean appear cold in the summer.
When it turns to winter, the heat absorbed by the ocean in the summer gets radiated making the cold in San Diego negligible. Applying this same logic to Mount Laguna, which is not near a body of water, it can be understood that it would have more extreme temp. swings.
Along with water, there is wind currents. I don't live in Mount Laguna, but I have to assume from the context you gave me that a cold wind current usually flows there, making it colder than in San Diego, which has a warm current.
The location also matters, if this town is under a valley, canyon, or mountain it could be under a shadow further decreasing the temp. more than San Diego.
Hopefully this helps, and good luck!
How does the temperature of Santa Barbara, California compare to the temperature of Neah Bay, Washington? helllppp i neldd hellpppp fasttt
Answers
The climate in Santa Barbara, California and Neah Bay, Washington is vastly different, resulting in significant differences in temperature. Santa Barbara experiences a warm-summer Mediterranean climate, while Neah Bay experiences a marine west coast climate.
Santa Barbara, California has a Mediterranean climate, specifically classified as a warm-summer Mediterranean climate according to the Köppen climate classification system. This climate is characterized by long, warm, and dry summers, and mild, wet winters. The temperatures in Santa Barbara are relatively uniform throughout the year, ranging from 62°F to 74°F.
On the other hand, Neah Bay, Washington experiences a marine west coast climate, classified as Cfb in the Köppen climate classification system. This climate is characterized by heavy rainfall and high humidity. The temperatures in Neah Bay vary throughout the year, with January temperatures ranging from 41°F to 61°F and August temperatures ranging from 48°F to 68°F.
The differences in climate result in contrasting temperatures between the two locations. Santa Barbara can have hot and dry conditions due to its Mediterranean climate, while Neah Bay tends to be cool and humid due to its marine west coast climate.
In conclusion, Santa Barbara, California and Neah Bay, Washington have distinct climates, leading to notable variations in temperatures. Santa Barbara experiences a warm-summer Mediterranean climate with uniform temperatures, while Neah Bay has a marine west coast climate with more fluctuating temperatures throughout the year.
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How many moles of gold (Au) are there in 3.01 X 10^23 atoms of gold (Au)?
Answers
3.01 x 10^23 Au* 1m / 6.022 x 10^23
= .499m Au
6. What is the new freezing and boiling point of a solution that has 58. 5 g (HyS odded to 200 kg of woter? (K, H,Os 186 °C/m K, H,O: 512 °C/m)
Answers
The new freezing point of the solution is -0.01597 °C and the new boiling point is 100.004 °C.
To determine the new freezing and boiling point of the solution, we need to use the equation:
ΔTf = Kf × m
ΔTb = Kb × m
Where:
ΔTf = the change in freezing point
ΔTb = the change in boiling point
Kf = the freezing point depression constant for the solvent = 1.86 °C/m
Kb = the boiling point elevation constant for the solvent = 0.512 °C/m
m = molality of the solution = moles of solute per kilogram of solvent
First, we need to calculate the molality of the solution:
58.5 g of H₂S is the solute, and it has a molar mass of 34.08 g/mol. Therefore, the number of moles of H₂S is:
moles of H₂S = 58.5 g / 34.08 g/mol = 1.717 mol
The mass of water is given as 200 kg, which is equivalent to 200,000 grams.
molality = moles of solute/kilograms of solvent
molality = 1.717 mol / 200 kg = 0.008585 mol/kg
Now, we can calculate the change in freezing point and boiling point:
ΔTf = Kf × m = 1.86 °C/m × 0.008585 mol/kg = 0.01597 °C
ΔTb = Kb × m = 0.512 °C/m × 0.008585 mol/kg = 0.004393 °C
To find the new freezing point, we need to subtract the change in freezing point from the freezing point of pure water (0°C):
New freezing point = 0°C - ΔTf = 0°C - 0.01597 °C = -0.01597 °C
To find the new boiling point, we need to add the change in boiling point to the boiling point of pure water (100°C):
New boiling point = 100°C + ΔTb = 100°C + 0.004393 °C = 100.004 °C
Therefore, the new freezing point of the solution is -0.01597 °C and the new boiling point is 100.004 °C.
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Magnesium reacts with hydrochloric acid to form hydrogen gas according to the equation below. If sufficient hydrochloric acid is used to react completely with 72.9 g of magnesium, calculate how many moles of hydrogen gas (H2) will be produced. Use the stoichiometry road map to first convert the mass of Mg into moles of Mg
Answers
3 moles of hydrogen gas (H2) will be produced If sufficient hydrochloric acid is used to react completely with 72.9 g of magnesium.
The chemical reaction described in the question is represented in the following equation:Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)According to this equation, 1 mole of magnesium produces 1 mol of hydrogen gas. First, we convert 72.9g of Mg to moles using the following formula:moles of Mg = 72.9g ÷ 24.3g/molmoles of Mg = 3 molIf 1 mole of magnesium produces 1 mol of hydrogen gas. Therefore, 3 moles of Mg will produce 3 moles of hydrogen gas.Learn more: https://brainly.com/question/14919968?referrer=searchResults
Why are some isotopes radioactive and some are not?
Answers
Answer: there are atoms that either have too many or too few neutrons or protons in their nuclei. This results in an imbalance between the jedi forces holding them together, which leads to an excess of internal energy. Such atoms are said to be unstable or radioactive.
Explanation:
The following was the result of a regression of P/E ratios on growth rates, betas, and ROE for stocks listed on the S&P 500 in April 2018: P/E = 18.69 + 0.0695 GROWTH - 0.5082 BETA + 0.4262 ROE
which of the indipendent variable has the sign different from the one expected
a.Roe b.beta
c.growth
d. no one
Answers
The independent variable with a sign different from the one expected is (c) growth.
The regression equation provided is: P/E = 18.69 + 0.0695 GROWTH - 0.5082 BETA + 0.4262 ROE.
In the equation, the coefficients represent the expected impact of each independent variable on the dependent variable (P/E ratio). A positive coefficient indicates a positive relationship, and a negative coefficient indicates a negative relationship.
Comparing the coefficients to the expected signs:
a. ROE has a coefficient of 0.4262, and it is expected to have a positive impact on P/E ratios, which matches the expected sign.
b. BETA has a coefficient of -0.5082, and it is expected to have a negative impact on P/E ratios, which matches the expected sign.
c. GROWTH has a coefficient of 0.0695, and it is expected to have a positive impact on P/E ratios. However, since the coefficient is positive instead of negative, the sign is different from the expected sign.
Therefore, the independent variable with the sign different from the one expected is (c) growth.
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