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Why is scientific notation used?
A. to round numbers to the nearest whole number
B. to promote reproducibility of data
C. to increase the validity of data
D. to express very large or very small numbers
Answers
Answer:
c.to increase the validity of data
Answer:
i think its D
Explanation:
pls tell me if im wrong
Related Questions
Please help me answer this you just need to answer true or false
Answers
Answer: I think it would be false but im not 1000% sure
Answer:
true
Explanation:
proposed a new one
What is the order of the solvents from most to least polar?
Answers
The position in extremity from most to least is water, ethanol, ethyl acetic acid derivation, CH3)2CO, 2-butanone, diethyl ether, hexane, and benzene.
From these solvents, ethanol will be totally miscible in water because of its more modest carbon fasten and it's capacity to frame hydrogen bonds.
Water is a polar dissolvable; other polar solvents incorporate CH3)2CO, acetonitrile, dimethylformamide (DMF), dimethylsulfoxide (DMSO), isopropanol, and methanol.
One way you could really work out a dissolvable's extremity is by utilizing its dielectric consistency, which is utilized to quantify how well the dissolvable can part of the way drop the field strength of the electric field of a molecule added to it. The higher the worth of a dissolvable's dielectric consistent, the more polar it will be.
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Drag each tile to the correct image.
Match each alkane name with its structure.
octane
decane
propane
butane
heptane
CHE
IGH
CHE
Reset
Next
Answers
Answer:
The first one is Propane
The second one is HEPTANE
The third one is octane
The 4th is butane
the 5th is decane
The structures have been named according to IUPAC as \(\rm C_3H_8\) Propane, \(\rm C_7H_{16}\) Heptane, \(\rm C_8H_{18}\) Octane, \(\rm C_4H_{10}\) Butane, and \(\rm C_{10}H_{22}\) Decane.
The images has been the representation of the ball and stick structure of the compounds. The central balls have been the representation of the carbon atom , with small balls attached to the sticks have been the representation of the hydrogen attached.
The following structures has been given as:
The structure has 3 carbon atoms with the presence of 8 hydrogen. The molecular formula has been \(\rm C_3H_8\). It has been the structure of propane.The structure has 7 carbon and 16 hydrogen. The structure has been the representation of heptane with molecular formula \(\rm C_7H_{16}\).The structure has molecular formula \(\rm C_8H_{18}\) with 8 carbon and 18 hydrogen. It has been named Octane, according to IUPAC.The structure with 4 carbon and 10 hydrogen with molecular formula \(\rm C_4H_{10}\) has been named according to IUPAC as butane.The structure with molecular formula \(\rm C_{10}H_{22}\) has presence of 10 carbon and 22 hydrogen. It has been named as Decane.The structures have been named according to IUPAC as \(\rm C_3H_8\) Propane, \(\rm C_7H_{16}\) Heptane, \(\rm C_8H_{18}\) Octane, \(\rm C_4H_{10}\) Butane, and \(\rm C_{10}H_{22}\) Decane.
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Part C
Why do you use the same amount of baking soda and same amount of liquid for each combination?
Answers
Answer:
because you might have a too much bigger than explosion if you add more baking soda or vinegar
Explanation:
You use the same amount of baking soda and the same amount of liquid for each combination for the explosion.
We know that,
When you use the same amount of baking soda and the same amount of liquid for each combination then be get the explosion.
Baking soda and liquid are base and acid so they react chemically.
Here, the given liquid is vinegar
If you will increase the amount of baking soda and if you will increase the amount of liquid then no reaction
So, you use the same amount of baking soda and the same amount of liquid for each combination for the explosion.
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What's an example of an ionic bond and why is it ionic
Answers
Ionic bonding in sodium chloride. An atom of sodium (Na) donates one of its electrons to an atom of chlorine (Cl) in a chemical reaction, and the resulting positive ion (Na+) and negative ion (Cl−) form a stable ionic compound (sodium chloride; common table salt) based on this ionic bond.
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The recommended dose of aspirin will yield approximately 100.0 micrograms/mL in the blood. How many molecules of aspirin (C9H8O4) are in a drop (0.100 mL) of blood?
Answers
Answer:
3.34x10¹⁶ molecules of aspirin are in a drop of blood
Explanation:
The recomended dose of aspirin in blood is 100.0μg/mL =
1x10⁻⁴g aspirin / mL of blood.
In a drop (0.100mL) there are:
0.100mL ₓ (1x10⁻⁴g aspirin / mL of blood) = 1x10⁻⁵g aspirin.
Molecular mass of aspirin is:
9C = 12.01g/mol ₓ 9 = 108.09g/mol
8H = 1.01g/mol ₓ 8 = 8.08g/mol
4O = 16g/mol ₓ 4 = 64g/mol
108.09 + 8.08 + 64 = 180.17g/mol
Thus, moles of aspirin in 1x10⁻⁵g are:
1x10⁻⁵g ₓ (1mol / 180.17g) = 5.55x10⁻⁸ moles of aspirin
In 1 mole, you have 6.022x10²³ molecules, thus:
5.55x10⁻⁸ moles of aspirin ₓ (6.022x10²³ molecules / 1 mole ) =
3.34x10¹⁶ molecules of aspirin are in a drop of bloodWhat happens to the wavelength and frequency of light as you move from red to violet?
A. Both wavelength and frequency increases.
B. Both wavelength and frequency decreases.
C. Wavelength decreases and frequency increases.
D. Wavelength increases and frequency decreases.
Answers
Both Arrhenius and Bronsted-Lowry defintions of an acid are similar. According to both of these definitions, an acid is a compound that -
donates a pair of electrons
contains a nonmetal anion
donates a hydrogen ion
should be labeled as corrosive
Answers
Answer:Donates a hydrogen ion
Explanation:
Which are three ways water reaches the atmosphere?
A. sublimation, condensation, transpiration
B. evaporation, radiation, and condensation
C. transpiration, evaporation, and sublimation
Answers
Answer:
C. Transpiration, evaporation, and sublimation.
Explanation:
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Please help me.
Refer to the observations of the test tubes from part A. Determine which metal (or hydrogen) in each test tube is more reactive. Remember that the less reactive metal (or hydrogen) will typically end up in pure form as an element, so no reaction will occur if the less reactive metal (or hydrogen) is the one that begins in pure form
Answers
The metal which are placed above in the reactive series are more reactive and the metals which are below in the reactivity series are less reactive.
The reactivity of the metals is analyzed by the position of the metals in activity series of metals. Metals which are more reactive are placed at the top of the series and the metals which are less reactive are placed at the bottom of the series.
The more reactive metal is given below as :
1) Iron is more reactive
2) Hydrogen is more reactive
3) Zinc is more reactive
4) Magnesium is more reactive
5) Zinc is more reactive
6) Iron is more reactive
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SOMEONE PLEASE HELP HURRY
Answers
I think the answer is A. I know it's Planet X.
Which of the following are properties of metals? Select all that apply.
Ductile
High electrical conductivity
Malleable
Lustrous
Answers
Answer:
All of them
Explanation:
All of those are properties of metals
Answer:
A, B, C and D
Explanation:
All of them are properties of metals
2. Which change in oxidation number indicates
oxidation?
A) -1 to +2
C) -1 to - 2
B) +3 to +2
D) +2 to -3
Answers
Answer:
A)
Explanation:
Increasing of oxidation number shows that the process is oxidation(or losing of electrons).
-1 to +2, oxidation number is increased. This is an oxidation process.
-
10) Calculate the energy change for the formation of LiCl(s) from its elements in their standard states and the following tabulated information: ?
1 Li(s) + 1/2 C12(s) — LiCl(s)
2 Li+(g) + Cl-(s) -- LiCl(s)
3 Li(s) — Li(g)
4 1/2 Cl2(g) - Cl(g)
5 Cl(g) + e- →Cl-(3) Li(g) → Lit(g) + e-
1-853 kJ/mol
2+159.4 kJ/mol
3+121.7 kJ/mol
4-348.6 kJ/mol
5+520.2 kJ/mol
A) +1305.7 kJ/mol
B) +296.9 kJ/mol
C) -400.3 kJ/mol
D) -627.2 kJ/mol
Answers
Answer:
-400.3 kJ/mol
Explanation:
A gas has a volume of 62.65 L at stp. At what temperture in C would the volume of the gas be 78.31 at a pressure of 612 mm hg
Answers
Answer:
1.79°C
Explanation:
Applying,
PV/T = P'V'/T'................. Equation 1
Where P = Initial presssure, V = Initial volume, T = Initial temperature, P' = Final pressure, V' = Final volume, T' = Final Temperature.
make T' the subject of the equation
T' = P'V'T/PV................ Equation 2
From the question,
Given: P = 760 mmHg (Standard pressure), T = 273 K (Standard temperature), V = 62.65 L, P' = 612 mmHg, V' = 78.31
Substitute these values into equation 2
T' = (612×78.31×273)/(760×62.65)
T' = 274.79 K
T' = (274.79-273) °C
T' = 1.79°C
the ph of a solution of acetic acid is measured to be . calculate the acid dissociation constant of acetic acid. be sure your answer has the correct number of significant digits.
Answers
Acetic acid's acid dissociation constant (Ka) is approximately 2.95× \(10^{(-3)}\).
The pH of a solution is the concentration of hydrogen ions in the solution.
The relationship between pH, Ka, and the concentrations of the acid and its conjugate base is
\(pH = pK_{a} +log \frac{[A^{-}]}{[HA]}\) where \([A^{-}]\) is the concentration of \(CH_{3}COO^{-}\).
In this case, the pH is given as 2.47, and the concentration of acetic acid is 0.63 M. We can assume that the concentration of the conjugate base (acetate ion, \(CH_{3}COO^{-}\)) is inappreciable as compared to the concentration of the acid. It is because the given acid is a weak acid and does not dissociate easily.
Using the Henderson-Hasselbalch equation, we can rearrange it to solve for pKa:
\(pK_{a} = pH-log\frac{[A^{-}]}{[HA]}.\)
As the concentration of the conjugate base is very less so, we can simplify the equation to:
\(pKa = pH \\Ka =10^{(-pKa)}=10^{(-2.47)}.\)
So, Ka ≈ 2.95 × \(10^{(-3)}\).
The complete question is
The pH of a 0.63 M solution of acetic acid is measured to be 2.47. Calculate the acid dissociation constant K of acetic acid. Be sure your answer has the correct number of significant digits.
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classify of covalent bond according to the
number of bonds between atoms
Answers
Explanation:
Covalent bonds can be classified based on the number of bonds between atoms into three categories:
1. Single Covalent Bond: In a single covalent bond, two atoms share one pair of electrons. This is the most common type of covalent bond. For example, in H2O, each hydrogen atom forms a single covalent bond with the oxygen atom.
2. Double Covalent Bond: In a double covalent bond, two atoms share two pairs of electrons. This bond is stronger than a single covalent bond. For example, in O2, the oxygen atoms are connected by a double covalent bond.
3. Triple Covalent Bond: In a triple covalent bond, two atoms share three pairs of electrons. This bond is the strongest among the three types. For example, in N2, the nitrogen atoms are connected by a triple covalent bond.
It is important to note that the number of bonds between atoms is determined by the number of electrons they need to achieve a stable electron configuration, which varies depending on the elements involved.
The covalent bond is classified mainly into three types
single, double and triple bonds.
Covalent bond is a bond formed between two atoms through the sharing of two electrons between them. The atoms will share more than one electron pairs if the valency is not satisfied. the three types of covalent bond are single bond, double bond and triple bond.
single bond is formed when one pair of electrons are shared between atoms, while if two pairs or three pairs are shared, it is called double or triple bond respectively. Covalent compounds are those which contains covalent bonding.
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Explain how heat as a reactant or product in a chemical reaction makes the change endothermic or exothermic?
Answers
✅Chemical reactions often involve changes in energy due to the breaking and formation of bonds. Reactions in which energy is released are exothermic reactions, while those that take in heat energy are endothermic.
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Answer:
Heat as a reactant makes the change endothermic, while heat as a product makes the change exothermic.
Explanation:
In an endothermic reaction, heat is a reactant, making the endothermic reaction cooler than its surroundings. This can be compared to how an ice cube melting requires heat as a reactant.
In an exothermic reaction, heat is a product, making the exothermic reaction hotter than its surroundings. This is compared to how a fire releases heat into the air as a product.
Which of the following is NOT part of Dalton's Atomic Theory?
1. Atoms are composed of tiny subatomic particles.
2. Atoms that combine do so in simple, whole-number ratios.
3. All elements are composed of atoms.
4. Atoms of the same element are identical.
Answers
Answer: The statement that theatoms are made up of protons, neutrons, and electrons is not a part of Dalton's atomic theory. Therefore, option c is correct.
Explanation:
Consider the following intermediate reactions. 2 equations. First: upper C upper H subscript 4 (g) plus 2 upper O subscript 2 (g) right arrow upper C upper O subscript 2 (g) plus 2 upper H subscript 2 upper O (g). Delta H 1 equals negative 802 kilojoules. Second: 2 upper H subscript 2 upper O (g) right arrow 2 upper H subscript 21 upper O (l). Delta H subscript 2 equals negative 890 kilojoules. The overall chemical reaction is as follows. Upper C upper H subscript 4 (g) plus 2 upper o subscript 2 (g) right arrow upper C upper O subscript 2 (g) plus 2 upper H subscript 2 upper O (l). What is the correct enthalpy diagram using the Hess law for this system?.
Answers
The correct enthalpy change for the overall chemical reaction is \(\(+978 \, \text{kJ}\).\)
Using the given intermediate reactions and their corresponding enthalpy changes, we can determine the enthalpy change for the overall chemical reaction. The enthalpy changes of the individual reactions can be summed up to obtain the enthalpy change for the overall reaction.
First reaction:\(\(C_2H_4(g) + 3O_2(g) \rightarrow 2CO_2(g) + 2H_2O(g) \quad \Delta H_1 = -802 \, \text{kJ}\)\)
Second reaction: \(\(2H_2O(g) \rightarrow 2H_2O(l) \quad \Delta H_2 = -890 \, \text{kJ}\)\)
To obtain the overall reaction, we need to cancel out the common species, which is\(\(2H_2O(g)\)\). By multiplying the second reaction by 2, we can cancel out the water vapor and combine the reactions:
\(\(2(2H_2O(g) \rightarrow 2H_2O(l)) \rightarrow 4H_2O(l) \quad \Delta H_2 = -2 \times (-890 \, \text{kJ}) = +1780 \, \text{kJ}\)\)
Now, we can add the enthalpy changes of the individual reactions to get the enthalpy change for the overall reaction:
\(\(\Delta H_{\text{overall}} = \Delta H_1 + \Delta H_2 = -802 \, \text{kJ} + 1780 \, \text{kJ} = +978 \, \text{kJ}\)\)
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Helen recorded the following data about the half-life of a radioisotope. Radioactive Decay of Radioisotope A Grams of Radioactive Material Remaining Time (in billions of years) 200 0 100 1 50 2 25 3 12.5 4 6.25 5 Which of the following types of graphs could Helen use to best organize her data? A. bar graph B. line graph C. histogram D. circle graph
Answers
Answer:
Line graph
Explanation:
I did it on Study Island
Radioisotopes are substances that are radioactive and have atoms with an unstable nucleus. The data about the radioisotope can be best organized in a line graph. Thus, option B is correct.
What is a graph?A graph is a tool used to represent the data that contains the numerical data and includes the vertices and points to show the numbers and information in a statistical way. It is used to represent the variables of the tables in an easy and understandable manner.
Graphs can be bars, points, lines, columns, bubbles, areas, pie charts, etc. The line graphs use lines to connect the individual variables and are used to track the changes in radioactive material over a time period. It can easily represent the half-life and the remaining time of the radioactive decay.
Therefore, option B. a line graph will be best to represent the information.
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An atom of hydrogen loses its electron. What is its charge?
+1
0
−1
+2
Answers
Answer:
Hhhhhere is The answer : +1
write its IUPAC name?
Answers
Answer:
Hello
please make sure that there is any group which is join with alkane
Which event always involves a chemical change A boiling B melting C conducting D burning
Answers
Answer:
burning
Explanation:
When a chemical change occurs, the matter is transformed into a new substance. When a substance is burned, it will change into something new. Thus, you know that burning is a chemical change. All the other options are physical properties. The substances may change state, but they will not change identities.
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Find the coordinates of the midpoint of the segment given it's endpoints (-3, 7) and (3,-5)
Answers
Answer:
(0,1)
Explanation:
Endpoints (-3, 7) and (3,-5)
The midpoints will be the average of the x and y coordinates:
Midpoint for x = (-3+3)/2 = 0
Midpoint for y = (7-5)/2 = 1
(0,1)
How does the number of reactants in a decomposition reaction compare with
the number of products?
A. The number of reactants may be greater than or less than the
number of products.
B. The number of reactants is the same as the number of products.
C. The number of reactants is less than the number of products.
D. The number of reactants is greater than the number of products.
Answers
The number of reactants is less than the number of products in a decomposition reaction.
What is a Decomposition reaction?This is the type of chemical reaction which involves a reactant being broken down into two or more products.
This means the number of product is always greater than the reactant which is why option C was chosen.
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How many moles are equal to 1.3 x 1024 atoms of aluminum?
Answers
Answer:
The answer is 2.16 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
\(n = \frac{N}{L} \\ \)
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
\(n = \frac{1.3 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 2.159468...\)
We have the final answer as
2.16 molesHope this helps you
In an effort to sanitize his water, Beethoven knows that bromine can be used to purify water. If Beethoven has 2.12 x 1022 formula units of aluminum bromide are reacted with excess chlorine gas, how many milliliters of liquid bromine (density = 3.12 g/mL) are formed?
Answers
Answer:
2.7 mL
Explanation:
The equation of the reaction is;
2AlBr3 + 3Cl2 -----> 2AlCl3 + 3Br2
Number of moles in 2.12 x 1022 formula units of aluminum bromide
1 mole of AlBr3 = 6.02 * 10^23 formula units
x moles = 2.12 x 1022 formula units
x = 2.12 x 1022 formula units * 1 mole/ 6.02 * 10^23 formula units
x = 0.0352 moles of AlBr3
According to the reaction equation;
2 moles of AlBr3 produces 3 moles of Br2
0.0352 moles of AlBr3 produces 0.0352 moles * 3 moles /2 moles
= 0.0528 moles of Br2
Mass of Br2 produced = 0.0528 moles of Br2 * 159.808 g/mol
Mass of Br2 produced = 8.44g
But density = mass/volume
volume = mass/density
volume of Br2 = 8.44 g/ 3.12 g/mL
volume of Br2 = 2.7 mL
what is the molarity of acetic acid in vinegar, which is 5% acetic acid by mass. the denisty of vinegar is 1.01
Answers
We are given with the mass % of acetic acid, which means in a sample of 100 g, 5 g is of acetic acid.
also, given that is density of vinegar, acetic acid is 1.01 g/l
and are asked to determine the molarity of acetic acid.
Molarity = number of moles/volume
number of moles of acetic acid = Given Mass/Molar Mass
Molar Mass of acetic acid = 60 g/mol
number of moles = 5/60
number of moles = 0.083 moles
For volume, we know that density = mass/volume
volume = mass/density
volume of acetic acid = 5/1.01
volume = 4.95 l
Molarity = number of moles/volume
Molarity of acetic acid = 0.083/4.95
Molarity = 0.0167M
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Which group on the periodic table is an atom with 5 valence electrons?Group 4 AGroup 2 AGroup 5 AGroup 15 A
Answers
Explanation:
The atoms on the periodic table are grouped according to having similar properties. Therefore, atoms of group 15 has 5 valence electrons.
Answer:
The last option is correct.