I wanted to know the units or if the units I put on the table is right. For example the unit for mass of solid or the unit for volume of water

AnswerExplanation:

The liters of a 6.85 M solution that should be used to make the solution can be calculated using the dilution formula.

The formula for calculating dilutions is:

C₁ = 2.45 M

V₁ = 7837 mL = 7837/1000 = 7.837 L

C₂ = 6.85 M

V₂ = unknown

The unknown volume, V₂ is the required volume needed to make the solution.

Therefore, the V₂ can be calculated using the formula above as follows:

Percent weight/volume (% w/v) is a way of expressing the concentration of a solutuon. The definition of it is:

% w/v = mass of solute /100 ml of solution

We have to find the volume of the 5.0 % (w/v) solution that contains 0.50 g of NaCl. So we are given these values:

Concentration % w/v = 5.0 %

mass of solute = 0.50 g

Since our solution is 5.0 % w/v Nacl, we know that it has 5.0 g NaCl in 100 ml of solution. So if we want to find the volume of solution that contains 0.50 g we can:

0.50 g of NaCl * 100 ml of solution/(5.0 g of NaCl) = 10. ml of solution.

10. mL of solution is the volume that contains 0.50 g of NaCl

Answer

Mole fraction of water = 0.066

Explanation

Given:

mass of methanol = 4.8 g

mass of water = 38 g

We know:

Molar mass of methanol = 32,04 g/mol

Molar mass of water = 18,01528 g/mol

Solution:

Step 1: Find the moles of methanol and water

n of methanol = m/M

n = 4.8g/32.04g/mol

n = 0.15 mol

n of water = 38g/18.01528

n = 2.11 mol

now mole fraction of methanol= mole of methanol/(mole of methanol + mole of water)

Mole fraction of methanol = 0.15mol/(0.15 mol + 2.11 mol)

Mole fraction of water = 0.066

You are preparing a solution from 750 L of a 3.0 M NaCl solution then 1.5 M NaCl solution could you produce by diluting the original solution is 1500L

Solution is a homogenous mixture of two or more substances in relative amounts that can be varied continuously up to what is called the limit of solubility.

Here given data is

Volume = V₁ =  750 L

M₁ =  3.0 M

M₂ =  1.5 M

V₂ = ?

We have to calculate  L of a 1.5 M NaCl solution could you produce by diluting the original solution = ?

So the formula is

M₁V₁ = M₂V₂

3.0 M ×750 L =  1.5 M ×V₂

V₂ = 1500L

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The percent yield of the reaction if 15.68 g of nitrogen and 10.74 g of hydrogen react to form 5.24 g of ammonia would be 82.35%.

From the balanced equation of the reaction below:

[tex]3H_2(g) + N_2 < - - > 2NH_3.[/tex]

The mole ratio of hydrogen to nitrogen is 3:1.

The molar mass of hydrogen is 2 g/mol

The molar mass of nitrogen is 28 g/mol

Recall that: mole = mass/molar mass

Mole of 10.74 g hydrogen = 10.74/2

                                           = 5.37 mol

Mole of 15.68 nitrogen = 15.68/28

                                      = 0.56 mol

This means hydrogen is in excess while nitrogen is the limiting reactant. The mole ratio of nitrogen and ammonia is 1:2. Thus, the equivalent mole of ammonia produced would be:

0.56 x 2 = 1.12 mol

Molar mass of ammonia = 17 g/mol

Mass of 1.12 mol ammonia = 1.12 x 17

                                            = 19.04 grams

Percent yield of the reaction = 15.68/19.04 x 100

                                               = 82.35%

In other words, the percent yield of the reaction is 82.35%.

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Explanation and Answer:

formula of Chlorite ion = ClO₂⁻

formula of Chlorate ion = ClO₃⁻

The chlorite ion contains two atoms of O, and the chlorate ion contains three atoms of O.

They are both cations and their charges are -1 but, the main difference between them is that the oxidation state of Cl in the chlorite ion is 3+ and the oxidation state of Cl in the chlorate ion is +5.

formula of sulfite ion = SO₃²⁻

formula of sulfate ion = SO₄²⁻

Sulfite and sulfate are both cations with charge -2. The oxidation state of S in the sulfite ion is +4 and the oxidation state of S in the sulfate ion is +6.

How are the chlorate and the chlorite ions similar to the sulfate and sulfite ions?

When naming a polyatomic ion the sufix is related to the oxidation state of the main element.

common positive oxidation states of Cl = +1 +3 +5 +7

common positive oxidation states of S = +4 +6

When the element has two main positive oxidation states (like S) , the sufix for the lower oxidation state is -ite (sulfite = +4) and the sufix for the greater oxidation that is usually more stable is -ate (sulfate = +6).

When the element has four main positive oxidation states (like Cl), the two in the middle are named in a similar way to the previous one. The lower oxidation state must have -ite as a sufix (chlorite = +3) and the sufix for the greater is -ate (chlorate = +5).

Ions are the charged chemical species. Chlorate and chloride are two different ions of chlorine which are represented as ClO₃⁻ and ClO₂⁻, respectively. These are similar to sulfate and sulfite ions in the difference in the charge present on them.

An ion is an atom or a molecule which carry a net electrical charge. The electric charge is a result of the valency of the atom.

Chlorite and chlorate are the two charged ions of chlorine and can be represented as:

Formula of Chlorite ion = ClO₂⁻

Formula of Chlorate ion = ClO₃⁻

The chlorite ion contains two atoms of O, whereas the chlorate ion contains three atoms of O. Both of these ions are anions as they carry a net negative charge with a charge of -1. The main difference between these two is the oxidation state of Cl in the chlorite ion which is +3 and the oxidation state of Cl in the chlorate ion is +5.

The sulfate and sulfite ions are the two charges species of sulfur which can be represented by:

formula of sulfite ion = SO₃²⁻

formula of sulfate ion = SO₄²⁻

Sulfite and sulfate are anions with a charge of -2. The oxidation state of sulfur in the sulfite ion is +4 and the oxidation state of sulfur in the sulfate ion is +6.

These are similar to chlorate and chloride ions in oxidation states which are: Oxidation state of Cl = +1, +3, +5, and +7 and Oxidation states of S = +4 and +6

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1) Titration. This is a common laboratory method used to determine the unknown concentration of a substance.

2) We use a solution with a known concentration. This solution can be an acid (or a base). We fill a burette with this solution.

3) In a flask, we have the solution with unknown concentration and a known volume. It can be a base (or an acid).

4) Let the solution out of the burette and into the flask. We have to do this until the indicator changes color. Read the volume in the burette.

5) Finally, we have to calculate the concentration of the solution.

ANSWER

EXPLANATION

Given that

The number o molecules is 6.02 x 10^23 molecules

Firstly, find the number of moles using the below formula

Recall, that the Avogadro's number is 6.02 x 10^23

Secondly, find the mass of CO2 using the formula below

Recall, that the molar mass of CO2 is given as 44.01 g/mol

Therefore, the mass of CO2 is 44 grams

1) First, let's write the equation:

NaOH(aq)

This would be the Gasoline, letter B, since gasoline is a hydrocarbon and these compounds are formed with covalent bonds, they share electrons and not gain or lose, forming ions and then conducting electricity, as we can see in the other 3 options, they all form ions.

Engineers come up with as many ideas to solve a problem as possible is so as to choose the best which is applicable in helping people.

This is referred to as an individual or a professional which employs the use of scientific knowledge in the construction and building of different types of machines and tools.

An engineer is someone who has a good analytic and problem solving skills and comes up with many ideas so as to be able to choose the best from the set of alternatives in helping people solve their problems or issues.

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ANSWER

The volume of the acid is 0.5 L

EXPLANATION

Given that;

The molarity of HCl is 1.00 M

The volume of Na2CO3 is 0.500 L

The molarity of Na2CO3 is 0.500M

To find the volume of HCl needed, follow the steps below

Step 1; Write the balanced equation for the reaction

In the above reaction, 2 moles of HCl is needed to completely react with Na2CO3 .

Step 2; Apply the molarity concept to find the volume of the acid

Where

CA is the concentration of the acid

VA is the volume of acid

CB is the concentration of the base

VB is the volume of the base

nA is the number of moles of acid

nB is the number of moles of base

Step 3; Substitute the given data into the formula in step 2

Hence, the volume of the acid is 0.5 L

Explanation:

We need to go through to stages to boil 41.1 g of water. We have to heat the sample of water from 84.7 °C to 100 °C (the boiling point) And then we have to provide enough heat to boil all the sample of water.

a) Heating from 84.7 °C to 100 °C:

This is calculated using the formula:

Q₁ = m * C * ΔT

Where Q₁ is the amount of heat, m is the mass of the sample, C is the specific heat of water and ΔT is the temperature change. We already know these values:

m = 41.1 g

C = 4.184 J/(g*°C)

ΔT = Tfinal - Tinitial = 100 °C - 84.7 °C

ΔT = 15.3 °C

Replacing these values we can get the amount of heat necessary for the first step:

Q₁ = m * C * ΔT

Q₁ = 41.1 g * 4.184 J/(g°C) * 15.3 °C

Q₁ = 2631 J

b) Boiling 41.1 g of water:

To find the amount of heat that we need to provide to the sample of water to completely boil it we can use this formula:

Q₂ = m * Cv

Where Cv is the latent heat of vaporization.

Cv = 2256 J/g

Q₂ = m * Cv

Q₂ = 41.1 g * 2256 J/g

Q₂ = 92721 J

c) Total amount of heat:

Qtotal = Q₁ + Q₂

Qtotal = 2631 J + 92721 J

Qtotal = 95352 J = 95400 J

Qtotal = 95.4 kJ

Answer: The amount of heat needed to boil the sample of water is 95.4 kJ or 95400 J.

Explanation:

P = 1.3 atm

V = 2.1 L

T = 75 °C = 75 + 273 = 348 K

R = 0.0821 atm.L / mol.K

n = ?

As, PV = nRT

therefore, n = PV/RT

n = 1.3 x 2.1 / 0.0821 x 348

n = 0.096 mole

The sides groups are what make each amino acid different from the others. Of the 20 side groups used to make proteins, there are two main groups: polar and non-polar. These names refer to the way the side groups, sometimes called "R" groups.

Using that,

In conclusion, the part of an amino acid that is different between the 20 different amino acids is the R-Group.

ANSWER:

• R-Group

mole ratio = 9:8

moles of CO2 = 3.07moles

molecules of C3H7OH = 2.75 * 10^22 molecules

The balanced form of the chemical rreaction is as shown below;

The mole ratio of oxygen to water as shown in the equation is 9:8

Given the following parameter

mole of oxygen that reacted = 4.6moles

According to stoichiometry, 9moles of oxygen produces 6 moles of caron dioxide. The moles of CO2 that is required will be expressed as:

Hence the moles of CO2 that will be produced is 3.07moles

Also if 4.6L of O2 reacted, the moles of oxygen that reacted will be;

According to stochiometry, 2 moles of C3H7OH reacts with 9moles of oxygen, the moles of C3H7OH required will be:

Convert the moles of C3H7OH to molecules as shown

Answer:

Explanation:

Here, we want to get the mass of H3PO4 produced

We start by getting the balanced equation of reaction:

The mass of H3PO4 produced would be based on the limiting reactant

The limiting reactant here is the one that would produce less amount of the product H3PO4

Firstly, let us get the number of moles of H3PO4 produced by each of the reactants

To get this, we start by getting the number of moles of each that reacted

We get this by dividing the masses by the molar masses

For water, we have it that the molar mass is 18 g/mol

Thus, the number of moles would be:

From the balanced equation of reaction:

4 moles of water produced 1 mole of H3PO4

5.2 moles of water will produce x moles of H3PO4

Thus:

For PCl5

The molar mass is 208 g/mol

Thus,we have the number of moles as:

From the equation of reaction:

1 mol of PCl5 produced 1 mol of H3PO4

That means 0.894 mol of PCl5 produced 0.894 mol of H3PO4

Since PCl5 produced a lesser amount of moles of water, that means, it is the limiting reactant

To get the mass of H3PO4 produced, we multiply this number of moles by

the molar mass of H3PO4

The molar mass of H3PO4 is 100 g/mol

Thus, we have the mass of H3PO4 produced as:

Answer:

Explanation:

Here, we want to select the option that is not an acid-base indicator from the options

Acid-base indicators are colored materials that are expected to change color based on the pH

A filter paper is a material used in filtration

As such, it cannot be used as an indicator

ANSWER

option B

EXPLANATION

Given that;

The molecular formula of the compound is given as BaCl2

The compound contain a metal and a non-metal

Ba means Barium

Cl2 is chloride because its a diatomic gas

Then BaCl2 is called Barium chloride

Therefore, the correct answer is option B

Answer:

I think the answer is calcium reacts with oxygen, forming a thin layer of CaO

Explanation:

I hope this helps

Maria is an 18 year old girl whose parathyroid has stopped functioning properly, this mean calcium levels in her body decreased.

Calcium (Ca) is a chemical element and an alkaline-earth metal from Periodic Table Group 2 (IIa). It is the fifth most abundant element in the Earth's crust and the most prevalent metallic element in human tissue.

The ancients made considerable use of lime (calcium oxide, CaO), a calcium compound. Sir Humphry Davy first extracted the lightweight, silvery metal itself in 1808 after distilling mercury from an amalgam created by electrolyzing a combination of lime and mercuric oxide. The Latin word for lime, calx, served as the inspiration for the element's name. The cosmic abundance of calcium is thought to be 4.9 104 atoms, and it makes up 3.64 percent of the crust of the Earth and 8 percent of the crust of the Moon.

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Assuming that this question is comparing two situations, only water as situation 1 and water + calcium chloride as situation 2. In this case, we will have the salt interacting with water in something called Colligative properties, which depending on the concentration of the solute, it will cause changes in physical state change of the solution. Salts in water tend to cause two things, regarding physical change, they raise the boiling point and lower the freezing point. Which is the case for this question, we have a solution with salt + water, therefore we will have a higher boiling point and a lower freezing point, number 3

ANSWER

option B

EXPLANATION;

The chemical symbol of iron is Fe

The chemical symbol of oxygen is O2

Therefore, the correct answer is B

Based on the model , the statement best compares the amounts energy in the reactants and the products of photosynthesis is since making sugar uses energy, the combined energy in the bond CO₂ and H₂O is greater than that in the bonds of O₂ and C₆H₁₂O₆

The plants make sugar using the energy that comes from sunlight and it will convert into the carbon dioxide and the water. this is called as photosynthesis. this  process occurs in the chloroplast in the plant cell.

Thus, Based on the model , the statement best compares the amounts energy in the reactants and the products of photosynthesis is since making sugar uses energy, the combined energy in the bond CO₂ and H₂O is greater than that in the bonds of O₂ and C₆H₁₂O₆

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Answer:

The number of yards is 792.

Explanation:

To convert 0.45 miles to yards it is necessary to use the equivalence from mile to feet, and then the equivalence from feet to yard:

So, it is 792 yards.

The oxygen gas is non polar because there is no interaction between the molecules of the gas.

A diatomic molecule is one that has only two atoms in it. These atoms are usually atoms of the same element in the majority of the cases that we encounter. Given the fact that the both atoms belong to the same substance, the electronegativity difference between the atoms is zero.

Given that the electronegativity difference between the atoms is zero, there is little or no interaction between the molecules of the substance. Thus the very weak intermolecular interaction is coming from the fact that there is no kind of interaction between the molecules.

Thus oxygen gas is covalent and the molecules do not interact with each other because the bond is nonpolar.

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Gas laws discover the relationship of pressure, temperature, volume and amount of gas.

1. Boyles Law

Boyle's Law tells us that the volume of gas increases as the pressure decreases, meaning pressure is inversely propotional to volume.

Equation used for Boyles Law: P1V1 = P2V2

Example: A 17.50mL sample of gas is at 4.500 atm. What will be the volume if the pressure becomes 1.500 atm, with a fixed amount of gas and temperature?

So in this example we are given, P1 and P2, we are also given V1 and we want to know V2. What will happen to the volume if the pressure is increased.

V2 = P1V1/P2

V2 = (4.500 atm x 17.50 mL)/1.500atm

V2 = 52.50mL

This example proves that when the pressure is increased, the volume also increases.

2. Charles Law

Charles' Law tells us that the volume of gas increases as the temperature increases. Volume is directly proportional to Temperature.

The equation used: V1/T1 = V2/T2

Example: A sample of Carbon dioxide in a pump has volume of 20.5 mL and it is at 40.0 oC (=313.15 K). When the amount of gas and pressure remain constant, find the new volume of Carbon dioxide in the pump if temperature is increased to 65.0 oC (=333.15 K).

V2 = (V1 x T2)/T1

V2 = (20.5 mL x 333.15 K)/313.15K

V2 = 21.8 mL

The volume increased as the temperature increased.

3. Avogadro's Law tell us that the volume of gas increases as the amount of gas increases. Volume(V) is directly proportional to the Amount of gas(n).

Equation: P1/n1 = P2/n2 and V1/n1 = V2/n2

Example: A 3.80 g of oxygen gas in a pump has volume of 150 mL. constant temperature and pressure. If 1.20g of oxygen gas is added into the pump. What will be the new volume of oxygen gas in the pump if temperature and pressure held constant?

This problem is asking for V2 of oxygen. We have to first calculate the number of moles of Oxygen.

n1 = 3.80/(15.999 x 2)

n1 = 0.1188 mol

n2 = 1.20/(15.999 X 2)

n2 = 0.0375 mol

V2 = (V1 x n2)/n1

V2 = (150.0mL x 0.0375)/0.1188

V2 = 47.3485 mL

4. The ideal gas law

The ideal gas law is the combination of the three simple gas laws.

Equation: pV = nRT

Example: At 655mm Hg and 25.0oC, a sample of Chlorine gas has volume of 750mL. How many moles of Chlorine gas at this condition?

So we want number of moles.

n = PV/RT

n = 655mmHg x( 1 atm/760 mmHg) x 0.75 L/0.082057L⋅atm⋅mol-1.K-1 x 298.15

n = 0.026 mol

According to the question, we are to categorize the definitions in the box as elements, compounds, or mixtures.

For ELEMENTS

• Since element,s consist of only one kind of atom,, hence they are ,substances made up of one type of particle (atoms or molecules)

• Since matter is anything that has mass and occupies space and is made up of substances called elements, hence, they are anything that has mass and volume

• Cannot be broken into simpler kinds, of matter since elements are made of atoms.

For COMPOUNDS

• Compounds can only be separated by chemical means but not by physical means. Hence we can say that ,compounds cannot be separated by physical means, but can be chemically

• Consists of atoms of two or more different elements bonded together

• Has properties unique to the element that makes it up

FOR MIXTURES

• Since the mixture consists of, two or more different elements ,and/or compounds physically, hence they can be separated by physical means.

• They can be separated into simpler types of matter by physical means and keeps the, properties of parts, that make it up.

First, we need to find the values of molar mass of Al and O at the periodic table:

Al : 27 g/mol

O: 16 g/mol

Now let's calculate the molar mass of Al2O3:

(2x27) + (16x3)

54 + 48 = 102 g/mol

Now let's calculate the percent of each element:

For Al:

102 ---- 100%

54 ---- x%

x = 52.9%

For O:

102 ---- 100%

48 ---- y%

y = 47.1%

Answer: 52.9% Al, 47.1% O

Answer:

It contains 75g of acetic acid.

Explanation:

With the percent mass (15%) and the mass of the solution of vinegar, we can calculate the amount of acetic acid, using the percent by mass formula:

So, it contains 75g of acetic acid.