Answers
Related Questions
what's the molecular geomrtry of SiCI4
Answers
Answer:
Tetrahedral
Explanation:
The molecular geometry of SiCl₄ is a tetrahedral shape. According to the VESPR molecular theory, the compound has a shape of a tetrahedron.
In this compound there are four bond pairs and no lone pairs. The total electron pair is 4 . The valence shell electron pair repulsion theory uses the total number of electrons pairs surrounding the central atom of a specie.
What do all the elements in one row of the periodio fable have in common?
Answers
Answer:
Energy levels
Explanation:
Elements in one row of the periodic table have the same energy levels. A row on the periodic table is the horizontal arrangement of elements. These rows are called periods.
There are 7 periods on the periodic table.
Each elements on a period begins with an atom having one valence electrons and then ending with completely filled orbitals. Elements in the same period are known to have the same electronic shells which is the energy level. The principal quantum number of their electrons is the same.At which point in its swing does the pendulum have the least gravitational potential energy
Answers
Answer:
a
Explanation:
a
What mass of iron is produced from adding 80.0 g of iron(II) oxide (71.85 g/mol) to 20.0 g of magnesium metal? FeO (l) + Mg (l) ----------> Fe (l) + MgO (s) Identify the limiting reactant, mass of iron produced and the mass in grams of the excess reactant used in this reaction. Remember to report the correct number of significant figures and units where appropriate. You need to show work in order to receive credit. Zero points will be awarded if logical work/explanation is not given. You must show your work by typing it into the provided test box. I will not look to your scratch paper for work.
Answers
Answer:
46.0g of Iron are produced
Explanation:
Based on the chemical reaction:
FeO(l) + Mg(l) → Fe(l) + MgO(s)
1 mole of Iron (II) oxide reacts per mole of Mg to produce 1 mole of iron
To solve this question we need to convert each mass of reactant to moles using its respectives molar masses in order to find limitng reactant. Moles of limiting reactant = Moles of iron produced:
Moles FeO (Molar mass: 71.85g/mol):
80.0g * (1mol / 71.85g) = 1.11moles FeO
Moles Mg (Molar mass: 24.305g/mol)
20.0g * (1mol / 24.305g) = 0.823 moles Mg
As moles of Mg < Moles FeO, Mg is limiting reactant and the moles of Fe are 0.823 moles.
The mass of Iron produced is:
0.823 moles Fe * (55.845g/mol) =
46.0g of Iron are produced
In the reaction 5 space B r to the power of minus space (a q )space plus space B r O subscript 3 to the power of minus space (a q )space plus space 6 space H to the power of plus space (a q )space rightwards arrow space 3 space B r subscript 2 space (a q )space plus space 3 space H subscript 2 O space (l )the rate of disappearance of Br- at some moment in time was determined to be 3.5 x 10-4 M/s. What is the rate of appearance of Br2 at that same moment
Answers
Answer:
\(r_{Br_2}=2.1x10^{-4}M/s\)
Explanation:
Hello,
In this case, for the reaction:
\(5Br^-(aq)+BrO_3^-(aq)+6H^+(aq)\rightarrow 3Br_2(aq)+3H_2O(l)\)
Thus, via the rate proportions between Br⁻ and Br₂ for which the stoichiometric coefficients are 5 and 3 respectively, we can write:
\(\frac{r_{Br^-}}{-5} =\frac{r_{Br_2}}{3}\)
Hence, the rate of appearance of Br₂ turns out:
\(r_{Br_2}=\frac{3r_{Br^-}}{-5}=\frac{3*-3.5x10^{-4}M/s}{-5}\\ \\r_{Br_2}=2.1x10^{-4}M/s\)
Take into account that the rate of disappearance is negative for reactants.
Best regards.
please help, please don’t answer links
Answers
Answer:
0.093 mole of C₆H₁₂.
Explanation:
We'll begin by calculating the molar mass of C₆H₁₂. This can be obtained as follow:
Molar mass of C₆H₁₂ = (12×6) + (12×1)
= 72 + 12
= 84 g/mol
Finally, we shall determine the number of mole in 7.8 g of C₆H₁₂. This can be obtained as follow:
Molar mass of C₆H₁₂ = 84 g/mol
Mass of C₆H₁₂ = 7.8 g
Mole of C₆H₁₂ =?
Mole = mass / molar mass
Mole of C₆H₁₂ = 7.8 / 84
Mole of C₆H₁₂ = 0.093 mole
Thus, 7.8 g contains 0.093 mole of C₆H₁₂.
Suppose you work at a theme park. Your supervisor wants you to make a sign displaying the maximum weight that a roller coaster train can carry. Your supervisor knows that the maximum weight is 1686.5 kg. However, he wants the sign to be quickly understood and tells you to make a sign that says: Maximum Weight 1700 kg. How could the lack of precision in this example cause problems?
Answers
Answer:
amusement parks. Each day, we flock by the millions to the nearest park, paying a sizable hunk of money to wait in long lines for a short 60-second ride on our favorite roller coaster. The thought prompts one to consider what is it about a roller coaster ride that provides such widespread excitement among so many of us and such dreadful fear in the rest? Is our excitement about coasters due to their high speeds? Absolutely not! In fact, it would be foolish to spend so much time and money to ride a selection of roller coasters if it were for reasons of speed. It is more than likely that most of us sustain higher speeds on our ride along the interstate highway on the way to the amusement park than we do once we enter the park. The thrill of roller coasters is not due to their speed, but rather due to their accelerations and to the feelings of weightlessness and weightiness that they produce. Roller coasters thrill us because of their ability to accelerate us downward one moment and upwards the next; leftwards one moment and rightwards the next. Roller coasters are about acceleration; that's what makes them thrilling. And in this part of Lesson 2, we will focus on the centripetal acceleration experienced by riders within the circular-shaped sections of a roller coaster track. These sections include the clothoid loops (that we will approximate as a circle), the sharp 180-degree banked turns, and the small dips and hills found along otherwise straight sections of the track.
Answer: well, for starters the maximum weight of the cart does say 1686.5kg n u decided to raise the weight by les jus say 14 kg, well that extra 14 kg might be the reason the whole cart accidently tips when it makes a sharp turn, n that's what well cause a problem
Explanation: im n k12 2 so i should know
2. Balance the following chemical equation: Ag2SO4 + Ga + Ga2(SO4)3 + Ag
Answers
Answer:
3(Ag2SO4)+2Ga -> Ga2(SO4)3+6Ag
Explanation:
Which of the following ions is not a part of the nitrogen cycle?NO+NH4+NO3NO2
Answers
INFORMATION:
We need to select which ion is not part of the nitrogen cycle
STEP BY STEP EXPLANATION:
To identify the ion that is not a part of the nitrogen cycle, let see the nitrogen cycle:
Nitrogen is the most abundant element in our planet’s atmosphere
1. Fixation: Nitrogen in its gaseous form (N2) can’t be used by most living things. It has to be converted or ‘fixed’ to a more usable form through a process called fixation. Nitrogen gas (N2) diffuses into the soil from the atmosphere, and species of bacteria convert this nitrogen to ammonium ions (NH4+), which can be used by plants.
2. Decomposition: Plants take up nitrogen compounds through their roots. Animals obtain these compounds when they eat the plants. When plants and animals die or when animals excrete wastes, the nitrogen compounds in the organic matter re-enter the soil where they are broken down by microorganisms, known as decomposers. This decomposition produces ammonia, which can then go through the nitrification process.
3. Nitrification: Nitrifying bacteria in the soil convert ammonia into nitrite (NO2-) and then into nitrate (NO3-). This process is called nitrification. Compounds such as nitrate, nitrite, ammonia and ammonium can be taken up from soils by plants and then used in the formation of plant and animal proteins.
4. Denitrification: Denitrification completes the nitrogen cycle by converting nitrate (NO3-) back to gaseous nitrogen (N2). Denitrifying bacteria are the agents of this process. These bacteria use nitrate instead of oxygen when obtaining energy, releasing nitrogen gas to the atmosphere.
We can see that in the nitrogen cycle NH4+, NO2 and NO3 take part. So, the ion that is not a part of the nitrogen cycle is NO+.
ANSWER:
NO+
If an experiment produces 5 g but should have made 500 g, what is the percent
yield?
Answers
Answer:
Percentage of yield = 1%
Explanation:
Given:
Amount of yield = 5g
Total amount of product = 500 gram
Find:
Percentage of yield = ?
Computation:
⇒ Percentage of yield = [Amount of yield / Total amount of product]100
⇒ Percentage of yield = [5g / 500g]100
⇒ Percentage of yield = [0.01]100
⇒ Percentage of yield = 1%
What would this mechanism look like?
Answers
Answer:
Not sure sorry :(
Explanation:
Which term refers to the process by which land is worn away by natural forces or human activity
I will mark brainliest
Answers
Answer:
The answer is A. Erosion
Explanation:
Took the quiz
Answer:
A- erosion
Explanation:
Erosion occurs when water, wind, or ice removes soil and rock and deposits it in a new area.
Occurs naturally, but is also impacted by human activity.
Caused by farming, deforestation, and building roads and cities.
33. what is the correct order for obtaining salt from a mixture of sand and water a) dissolving in water, filtration, evaporation b) evaporation, filtration, dissolving in water c) filtration, dissolving in water, evaporation.
Answers
To obtain salt from a mixture of salt and sand, the mixture is filtered, then dissolved in water, and finally, water is made to evaporate leaving the sand. So, option C is the correct answer.
Sand and salt mixture consists of soluble and insoluble components. Salt is soluble in water while sand is not. The sand from this mixture can be separated using filtration, a method of filtering insoluble components from a solvent, typically using filter paper or various mediums in an industrial process. This way sand is separated from the mixture.
However, there will be minute particles that may not be filtered but are mostly insoluble. So, the mixture is mixed in water where salt dissolves leaving the other impurities that are insoluble.
The salt water is then heated so that water evaporates leaving only the salt behind. In this way, only salt is obtained.
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If a sample of C-14 initially contains 1.6 mmol of C-14, how many millimoles will be left after 2250 years
Answers
Answer: 1.2 millimoles will be left after 2250 years
Explanation:
Expression for rate law for first order kinetics is given by:
\(t=\frac{2.303}{k}\log\frac{a}{a-x}\)
where,
k = rate constant
t = age of sample
a = let initial amount of the reactant
a - x = amount left after decay process
a) for completion of half life:
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
\(t_{\frac{1}{2}}=\frac{0.693}{k}\)
\(k=\frac{0.693}{5730}=0.00012years^{-1}\)
b) Amount left after 2250 years
\(2250=\frac{2.303}{k}\log\frac{1.6}{a-x}\)
\(2250=\frac{2.303}{0.00012}\log\frac{1.6}{a-x}\)
\(\log\frac{1.6}{a-x}=0.117\)
\(\frac{1.6}{a-x}=1.31\)
\({a-x}=\frac{1.6}{1.31}=1.2\)
Thus 1.2 millimoles will be left after 2250 years
what is the example of the theory of needs by jean Baptiste de lamark
Answers
Answer: Jean Baptiste de Lamarck is a famous biologist known for his theory of evolution. While he is known for his theory of inheritance of acquired characteristics, he also proposed a theory of needs to explain the evolutionary process.
According to Lamarck's theory of needs, animals have specific needs that arise due to changes in their environment. For example, if an animal lives in an area with tall trees, it may need to stretch its neck to reach the leaves for food. Over time, Lamarck believed that this need would cause the animal's neck to lengthen, and this acquired trait would be passed down to its offspring.
One example of Lamarck's theory of needs can be seen in the evolution of the giraffe. Lamarck proposed that the giraffe's long neck evolved due to a need to reach high branches for food. According to his theory, over time, the giraffe's neck lengthened as a result of this need, and this acquired trait was passed down to future generations, eventually resulting in the long-necked giraffes we see today.
However, it is important to note that Lamarck's theory of needs has been largely discredited in modern evolutionary theory, which relies on the principles of natural selection and genetic mutation to explain the process of evolution.
Explanation: i would reallyyyyyyy apreciate brainliest
What is the sum of 2.099 g and 0.05681 g? ____g
Answers
Answer:
2.15581g
Explanation:
How are ions made from neutral atoms?
Why?
O KATIE
yes
-
no
You have learned that not all atoms of an element are the same. Variation in the number of neutrons
results in different isotopes of the element. In this activity we will explore another variation that can take
place—the loss and gain of electrons. The exchange of electrons between atoms is a very common way for
chemical change to take place. We will see it many times throughout the year.
1. Use Model 1 to complete the following table.
see p. 2 for the model
Is the number of Is the number of Is the number of
Metal or protons the same panteons the same electrons the same
Charge
on the
Nonmetal in the atom in the atom in the atom
ion
and the ion? and the ion? and the ion?
Lithium
metal
no
1+
Magnesium
2+
Aluminum
yes
3+
Fluorine
1-
Oxygen nonmetal
Nitrogen
3-
2. Based on the table you completed in Question 1, what distinguishes a neutral atom from an ion?
Circle choice
Protons
Electrons
3. Examine the isotope symbols in Model 1.
a. Where is the ion charge located in the stope symbol?
Circle 2 choices: Top OR bottom + Left OR Right
be Is a charge indicated on the neutral atoms? If yes, where is it located?
No, charge is not indicated on an atom, because it is neutral
4. Which subatomic particle carries a positive charge?
no
2-
Inmut
Answers
Answer:
They can be turned into positive ions.
Explanation:
neutral atoms can be turned into positively charged ions by removing one or more electrons. Atoms that gain extra electrons become negatively charged. A neutral chlorine atom, for example, contains 17 protons and 17 electrons . By adding one more electron we get a negatively charged Ion with a net charge of negative 1
Use the diagram below to answer 3 questions
Answers
Answer:
The element X is sulfur.
Sulfur will gain 2 electrons to become an ion.
The charge of sulfide ion is (2-).
Explanation:
1. In consideration of the following acids.
HCI, H,SO, HPO, Acetic acid, Formic Acid, HF, carbonic acid, ammonium ion, water, nitric acid
a. Find conjugate bases
b. Provide complete/partial ionized equations
c. Group them as strong and weak acids
Answers
Conjugate acid-base pair is the combination of two compounds which can accept and donate hydrogen ions.
The compounds are HCI, H₂SO₄, HPO, Acetic acid, Formic Acid, HF, carbonic acid, ammonium ion, water, nitric acid.
a.
Conjugate bases of HCl is Cl⁻.
Conjugate bases of H₂SO₄ is HSO₄⁻.
Conjugate bases of HPO₄²⁻ is PO₄³⁻.
Conjugate bases of CH₃COOH is CH₃COO⁻.
Conjugate bases of formic acid is formate ion.
Conjugate bases of HF is F⁻.
Conjugate bases of carbonic acid is the bicarbonate.
Conjugate bases of ammonium ion ammonia.
Conjugate bases of water is H₃O⁺.
Conjugate bases of HNO₃ is NO₃⁻.
b.
HCl ⇄ H⁺ + Cl⁻
H₂SO₄ ⇄ 2H⁺ + SO₄²⁻
H₃PO₄ ⇄ H⁺ + PO₄³
CH₃COOH ⇄ H⁺ + CH₃COO⁻
HCOOH ⇄ H⁺ + HCOO⁻
HF ⇄ H⁺ + F⁻
H₂CO₃ + H₂O ⇄ HCO₃⁻ + H₃O⁺
Ammonia does not ionizes in water.
H₂O ⇄ H₃O⁺ + OH⁻
HNO₃ ⇄ H⁺ + NO₃⁻
c.
Strong acids: HCl, H₂SO₄, HNO₃,
Weak acids: H₃PO₄, CH₃COOH, HCOOH, HF, H₂CO₃, ammonium ion
Water is both weak and strong acid.
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Describe the atoms in matter as it changes from a gas to a liquid. ANSWER QUICK!! 90 POINTS IF ANSWER
Answers
Answer:
Clouds are water
Explanation:
When a gas gathers up into a cloud,the cloud starts to rain and water comes out of the cloud.
Question 21
How many moles of O atoms are in 88 grams of CO₂?
2.8 moles
6.0 moles
1.00 moles
2.0 moles
4.0 moles
Answers
Your final answer: There are 2.0 moles of O atoms present in 88 grams of CO2. Your final answer to this question is D, or 2.0 moles. If you need to better understand, let me know and I will gladly assist you.
18.35 mL of an HCN solution were titrated with 35.4mL of a 0.268M NaOH solution to reach the equivalence point. What is the molarity of the HCN solution
Answers
Answer:
0.517
Explanation:
HCN + NaOH → NaCN + H2O [balanced as written]
(35.4 mL) x (0.268 M NaOH) x (1 mol HCN / 1 mol NaOH) / (18.35 mL HCN) = 0.517 M HCN
Answer: 0.517
Explanation:
Calculate the approximate temperature of a 0.50 mol sample of gas at 2.7 atm and a volume of 1.20L
Answers
Answer:
79.0 K
Explanation:
Assuming the gas behaves like an ideal gas, we can solve this problem by using the following formula:
PV = nRTWhere:
P = 2.7 atmV = 1.20 Ln = 0.50 molR = 0.082 atm·L·mol⁻¹·K⁻¹ (it is a constant)T = ?We input the data:
2.7 atm * 1.20 L = 0.50 mol * 0.082 atm·L·mol⁻¹·K⁻¹ * TAnd solve for T:
T = 79.0 KIron reacts with chlorine to form iron(III) chloride.
2Fe + 3Cl2 → 2FeCl3
What mass (in grams) of chlorine gas is needed to react with 251 grams of iron?
Select one:
a.
71 grams
b.
392 grams
c.
479 grams
d.
622 grams
Answers
The mass (in grams) of chlorine gas is needed to react with 251 grams of iron is 479 grams. Option C.
To determine the mass of chlorine gas needed to react with 251 grams of iron, we need to use the stoichiometry of the balanced chemical equation:
2Fe + 3Cl2 → 2FeCl3
From the balanced equation, we can see that 2 moles of iron (Fe) react with 3 moles of chlorine gas (Cl2) to produce 2 moles of iron(III) chloride (FeCl3).
To calculate the mass of chlorine gas, we can follow these steps:
Step 1: Convert the given mass of iron (Fe) to moles.
Using the molar mass of iron (Fe), which is approximately 55.85 g/mol, we can calculate the number of moles of iron:
moles of Fe = mass of Fe / molar mass of Fe
moles of Fe = 251 g / 55.85 g/mol
moles of Fe ≈ 4.5 mol (rounded to one decimal place)
Step 2: Use the mole ratio from the balanced equation to find the moles of chlorine gas (Cl2) needed.
From the balanced equation, we know that 2 moles of Fe react with 3 moles of Cl2. Therefore, the moles of Cl2 can be calculated as:
moles of Cl2 = (moles of Fe / 2) * 3
moles of Cl2 = (4.5 mol / 2) * 3
moles of Cl2 ≈ 6.75 mol (rounded to two decimal places)
Step 3: Convert the moles of chlorine gas to grams.
Using the molar mass of chlorine gas (Cl2), which is approximately 70.90 g/mol, we can calculate the mass of chlorine gas:
mass of Cl2 = moles of Cl2 * molar mass of Cl2
mass of Cl2 = 6.75 mol * 70.90 g/mol
mass of Cl2 ≈ 479 grams (rounded to the nearest whole number) Option C is correct.
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4. How is the coordination number determined?
Answers
A chemist needs to determine the concentration of a sulfuric acid solution by titration with a standard sodium hydroxide solution. He has a 0.1463 M
standard sodium hydroxide solution. He takes a 25.00 mL
sample of the original acid solution and dilutes it to 250.0 mL.
Then, he takes a 10.00 mL
sample of the dilute acid solution and titrates it with the standard solution. The endpoint was reached after the addition of 18.47 mL
of the standard solution. What is the concentration of the original sulfuric acid solution?
Answers
The concentration of the original sulfuric acid solution is 0.05398M
In order to determine the concentration of the original sulfuric acid solution, we use the volume of the standard sodium hydroxide solution used in the titration along with the concept of stoichiometry.
Let us check the number of moles of sodium hydroxide (NaOH) used in the titration,
Moles of NaOH = Molarity of NaOH x Volume of NaOH
=0.1463M x 18.47 mL
= 0.002699 Moles
As the balanced chemical equation between Sulfuric acid (\(H_SO_4\)) and sodium hydroxide is 1:2, then we can deduct that 1 mole of sulfuric acid can react with 2 moles of sodium hydroxide.
In that case, the number of moles of sulfuric acid in the 10.00 mL sample is;
Moles of \(H_2SO_4\) = 0.002699 Moles x (1/2)
= 0.0013495 Moles
Now we can calculate the concentration of the original sulfuric acid solution:
That is, the concentration of \(H_2SO_4\) = Moles of \(H_2SO_4\) / Volume of original acid solution
=0.0013495 Moles / 0.02500L
=0.05398 M
Therefore, the concentration of the original sulfuric acid solution is approximately 0.05398 M.
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5. If a farmer has a corn crop and a herd of cows, which energy resource 20 poin
is the farmer most likely to use? *
O A. Geothermal
B. Biomass
C. Wind
D. Hydropower
I need y’all’s help xD please help <3 15 points ; )
Answers
Answer:
Biomass
Explanation:
It is Biomass because biomass is a Renewable and organic energy that is gotten from living things to generate sustainable electric energy. The farmer with corn and herds of cows has biomass energy resources because it is gotten from living things both plants and animals. The materials use for biomass gotten from plants and animals are woods, barks, straw, animals dung,gases produced by animals e.t.c.
The pOH of a solution is 8.3. Which of the following is true about the solution?
a
It is acidic and has a pH of 5.7.
b
It is acidic and has a pH of 3.8.
c
It is basic and has a pH of 5.7.
d
It is basic and has a pH of 3.8.
Answers
An answer has a pOH of 8.3. True about the solution is that it is basic and has a pH of 5.7.
What does "solution" mean in its simplest form?When one or more solutes are dissolved in a solvent, the result is a homogenous mixture known as a solution. a solvent is a substance that helps a solute dissolve so that a homogenous mixture results. When a substance dissolves in a solvent, it forms a homogenous mixture, which is known as a solute.
Why is a solution important in chemistry?A continuous variation in the relative proportions of a number of substances that is homogeneous and can be changed up to the solubility limit. Although the word "solution" is typically used to describe the liquids state of a substance, it is also possible for gases and solids to form solutions.
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The correct answer is that it is acidic and has a pH of 5.7.
V,r and i in parallel circuits
Answers
The relation between V, R, and I can be determined using Ohm's Law and the principles of parallel circuits.
Ohm's Law states that the voltage across a resistor (V) is equal to the current (I) flowing through it multiplied by its resistance (R). This can be expressed as V = I × R
In a parallel circuit, multiple resistors are connected in such a way that the voltage across each resistor is the same. This means that the voltage across all the resistors in parallel will be equal to the total voltage applied to the circuit. Therefore, the voltage (V) in the above equation represents the total voltage applied to the parallel circuit.
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Your question is incomplete, most probably the full question is this:
What is the relation between V, R, and I in a parallel circuit?
Can a molecule that has absorbed infrared radiation subsequently emit a photon with a wavelength in the uv region as a result?
yes
no
molecules cannot absorb infrared.
Answers
It is not possible that a molecule that has absorbed infrared radiation subsequently emit a photon with a wavelength in the UV region as a result.
Both infrared rays and ultraviolet rays belong to the electromagnetic spectrum. However, the infrared rays are lower in energy than the ultraviolet rays. Hence, infrared rays have a longer wavelength than ultraviolet rays.
This implies that it is not possible that a molecule that has absorbed infrared radiation subsequently emit a photon with a wavelength in the UV region as a result.
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