15 Mia is a nanny for three small children. Their parents have laid out dinner, including broiled chicken tenders, broccoli, and steamed carrots. When Mia puts the plates in front of them, one of the kids makes a face and announces, “I don’t eat broccoli!” What would be the BEST way for Mia to respond? A. “Your mom and dad say you need to eat it.” B. “Broccoli is good for you so eat all of it.” C. “Why don’t you at least take one bite?” D. “That’s ok as long as you eat the chicken.”

ANSWER

EXPLANATION

Given information

The mass of calcium bromide is 5.0 grams

Follow the steps below to find the mole of calcium bromide

Step1: Write the formula for calculating mole

Recall, that the molar mass of calcium bromide is 199.89 g/mol

Step 2: Substitute the given data into the formula in step 1

Explanation:

For reactants: BE 2CH2OH = 2*(3*414+351+460) = 4106kJ/mol

: BE 3O2 = 3*499 = 1497kJ/mol

For products: BE 2CO2 = 2*799 = 1598kJ/mol

: BE 4H2O = 4*2*460 = 3680kJ/mol

Answer:

Bond energy is 325kJ/mol

The law of conservation of mass states that mass is not created nor destroyed, it is just transforms.

A chemical reaction satisfies this law if the same amount of each element is present in both sides of the equation.

By looking at the choices, it can be observed that in the third choices, 1 sulfate ion is reacting and 2 sulfate ions are being produced. This violates the law of conservation of mass because if 1 sulfate ion reacts, 1 sulfate ion must be produced.

It means that the correct answer is the third choice.

In this question, we have HClO4 and KOH being mixed together and then a final pH being calculated, one way of doing this calculation is by finding out how many moles are being equivalent to each other and how many we have left divided by the total volume, so lets work on that:

HClO4 = 0.200 (volume) * 0.180 (concentration) = 0.036 moles

KOH = 0.270 ( concentration) * 0.150 (volume) = 0.0405

Total volume will be = 0.150+0.200 = 0.350 L

Now we can do the next calculation

(0.036 - 0.0405)/0.350

0.0128

This final value will be placed in the pH formula, which is:

pH = -log [H+]

pH = -log [0.0128]

pH = 1.89, letter D

We have a closed container, so the number of moles remains constant.

Now, the total pressure is equal to the sum of the partial pressures. And the partial pressure of a gas will depend on its molar fraction, that is, the moles of the gas over the total moles. So the partial pressure is defined as:

Where,

Pi is the partial pressure of the gas

ni, are the moles of the corresponding gas

nT, are the total moles

Pt is the total pressure.

1. Partial pressures of O2 and CO2

Answer: PO2=360mmHg

PCO2=540mmHg

2. Now, the density will depend of the number of moles and the volume. We can calculate the volume of the gases with the ideal gas equation that says:

For each gas we will have:

O2

PO2=340mmHg=0.45atm

T=37°C=310.15K

R is a constant = 0.08206 (atm.L)/(mol.K)

nO2=2mol

massO2=2mol x MolarMass = 2 mol x 31.998g/mol=63.996g

CO2

PCO2=540mmHg=0.71atm

T=37°C=310.15K

R is a constant = 0.08206 (atm.L)/(mol.K)

nCO2=3mol

massCO2=3mol x MolarMass = 3 mol x 44.01g/mol=132.03g

Answer:

Density O2=0.57g/L

Density CO2 = 1.23g/L

3. In the second situation, what will happen is that the partial pressure of the gases will decrease, since due to the pressure exerted by the piston, part of the moles of gas will dissolve in the water. So in the gas phase we will have fewer moles of gas.

Explanation:

The energy of a photon of the violet light can be obtained as follows:

E = energy

h = Plank's constant

f = frequency

-------

Data provided:

f = 7.31x10^14 Hz

--

Data needed:

h = 6.63x10^-34 Js

So, E = h x f = 6.63x10^-34 Js x 7.31x10^14 Hz = 4.85x10^-19 J

Answer: 4.84x10^-19 J (nearest value)

The empirical formulas refer to the formulas where the ratios are the simplest, while the molecular formula shows the number of each type of atom.

In this case, we have a molecular formula and we just have to simplify the number to get the empirical formula. Divide each number by 2.

Therefore, the empirical formula is

Answer

Elements found in in the same vertical columns (Group 1A, 2A, etc) will share common properties. In the periodic table, the vertical columns of elements are called groups, or families.

Explanation

The vertical columns on the periodic table are called groups or families because of their similar chemical behavior. All the members of a family of elements have the same number of valence electrons and similar chemical properties. The horizontal rows on the periodic table are called periods.

Hence, elements found in in the same vertical columns (Group 1A, 2A, etc) will share common properties. In the periodic table, the vertical columns of elements are called groups, or families.

To determine the mass of the number of atoms, the first step is to convert this number of atoms to moles using Avogadro's number:

Convert this amount of moles to grams using the molecular weight of Arsenic:

It means that the answer is 3.8199g.

To determine the mass percentage of each element in the compounds, we are going to use the following formula:

In the case of the last element of each compound, we are going to make the subtraction of 100% minus the addition of the other elements.

We are going to assume that we have 1 mole of every substance.

First, we have to determine the molecular weight of each substance:

a. NH3

If we have 1 mole of ammonia, then we have 17 g. Then, we can calculate the nitrogen mass percentage as follows:

Then, we make the subtraction to determine the hydrogen percentage:

Then, the answer is that the nitrogen mass percentage equals 82.4% and the hydrogen one is 17.6%

b. Na2CO3

We repeat the same steps that we did with the ammonia.

Then, the answer is that the sodium mass percentage equals 43.4%, the carbon is 11.3%, and the oxygen one is 45.3%

Answer:

Explanation:

Here, we want to get the amount of heat energy needed

Mathematically:

where:

Q is the amount of energy that we want to calculate

m is the mass of the iron sample which is 15 g

c is the specific heat capacity which is 0.448 J/g°C

ΔT is the change in temperature which is (100-22) = 78°C

Substituting the values, we have it as:

Synthetic substances:

Synthetic fibers e.g. are made from organic synthetic high-molecular compounds and are made synthetically from raw materials such as petroleum oil or petrochemicals.

Until here the answer is: petroleum oil

At home, we can find synthetic fibers, ceramics, plastics, etc

We can find synthetic fibers (polyester, Rayon, Spandex, etc) in caps, raincoats, and ropes.

Plastic can be found in bottles, cups, etc.

In World War 1, Chlorine gas was used as a toxic, poisonous gas to harm and terminate enemies.

Molar concentration or Molarity is a way to measure the concentration of a solution after some solute has been added to the solvent, the formula for Molarity is:

M = n/V

where:

M = molar concentration

n = number of moles

V = volume of the solution in Liters

In the question we are given the molarity and volume, let's add these information to our formula

0.6 M = n/2.5 L

n = 1.5 moles of Iodine should be added

Given that the pressure in the whole process is constant, we could use the Charles's law:

Let's replace our values and solve the equation for T2:

The temperature of the gas sample will be 201°C.

Answer

C

Explanation

A higher ranked element in the activity series is more reactive in a single replacement reaction. We predict a single replacement reaction will occur when a less reactive element can be replaced by a more reactive element in a compound. Therefore since A is more reactive, it will replace B in a single replacement reaction.

Step 1

N2(g) + 3 H2(g) → 2 NH3(g) (must be balanced)

The limiting reactant

Data needed:

The molar mass:

For N2) 28 g/mol

For H2) 2 g/mol

For NH3) 17 g/mol

Procedure:

28 g N2 ------ 3 x 2 g H2

7.0 g N2------- X = 1.5 g H2

According to this, for 7.0 g N2, 1.5 g H2 is needed to react, but 5.0 g is provided. Therefore, H2 is the excess, and N2 is the limiting reactant

1.5 g of H2 is reacted, so 5.0 g - 1.5 g= 3.5 g are leftover

------------------

Step 2

The theoretical yield.

Procedure:

28 g N2 ------ 2 x 17 g NH3

7.0 g N2------ X = 8.5 g NH3

Answer: The theoretical yield of ammonia is 15 g. FALSE

Answer

16,200 seconds

Explanation

Conversion factor:

1 hour = 60 minutes

1 minute = 60 seconds

Therefore,

4.5 hours x 60 minutes/1 hour = 270 minutes

270 minutes x 60 seconds/1 minute = 16,200 seconds

10.51 (g/cm³) is the Average Density of the given data.

Average Density = 10.34+10.58+10.62+10.51÷4

Average Density=42.05/4

Average Density=10.51

Density is defined as a material substance's mass per unit volume. Density is described by the equation d = M/V, where d stands for density, M for mass, and V for volume. Grams per cubic centimeter is the unit of measurement for density.

For instance, compared to Earth's density of 5.51 grams, water has a density of 1 grams per cubic centimeter. Another way to express density is in kilograms per cubic meter (in meter-kilogram-second or SI units)

It is easy to determine the relationship between mass and volume using density. For instance, the formula for determining a body's mass is M = Vd, while the formula for determining a body's volume is V = M/d.

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Explanation:

In solar power we use the radiation from the sun to produce electricity.

Answer: C. Solar power

The energy source that uses energy directly from the sun to produce electricity is solar power. The correct answer is option C.

Energy refers to the capacity or ability to do work or cause change. It is a scalar quantity that can be transferred or converted from one form to another, but it cannot be created or destroyed.

Solar power is generated by converting sunlight into electrical energy using solar panels or photovoltaic cells. These cells are made up of layers of silicon that absorb sunlight and convert it into an electrical current.

The energy produced by solar power is clean, renewable, and does not produce any harmful emissions or waste products.

In conclusion, solar power is the energy source that uses energy directly from the sun to produce electricity. Option C is the correct answer.

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Answer

9.987 grams of O2

Explanation

Given:

Mass of potassium chlorate that decomposed = 25.5 g

What to find:

The mass of oxygen produced.

Solution:

The first step is to write the balanced chemical equation for the reaction.

2KClO₃ → 2KCl + 3O₂

From the equation; 2 moles of KClO₃ produced 3 moles of O₂

1 mole KClO₃ = 122.55 g/mol and 1 mole O₂ = 31.998 g/mol

This implies (2 mol x 122.55 g/mol) = 245.1 g of KClO₃ produced (3 mol x 31.998 g/mol) = 95.994 g of O₂

Therefore, 25.5 g of KClO₃ will produce

Therefore, the mass of oxygen produced is 9.987 grams

ANSWER

Option C

EXPLANATION

The collision between particles of substance increases with an increase in the temperature.

Recall, that matter exists in three states which are;

solid

liquid

gas

The particles will move faster is gas because the intermolecular force binding the particles together is very weak and therefore, the collision between the particles are very fast

Therefore, the particles of steam at 110 degrees Celcius will move faster

Option C is correct

Answer:

Explanation:

Here, we want to get the valence electron number for each of the listed elements

The number of valence electrons is used to put elements into groups

Thus, an element will have 1 valence electron if it belongs to group 1

Now, let us get the valence electrons for each of the listed elements

Carbon C has 6 valence electrons

Chlorine Cl has 7 valence electrons

Neon Ne has 8 valence electrons

Calcium Ca has 2 valence electrons

Oxygen O has 6 valence electrons

Kindly note that we do not count the d-block when checking for the number of valence electrons. After the second group, we skip the next 10 (the transition metals) and count the next group, starting from Boron as 3, in that sequence

The type of reaction involved in the illustration is a single displacement reaction.

Displacement reactions are chemical reactions in which an atom displaces another atom from a participating species of the reaction. Displacement reactions could be:

When you consider this reaction: [tex]Zn + AgNO_3 -- > ZnNO_3 + Ag[/tex]. Zn displaced Ag from the compound, [tex]AgNO_3[/tex]. Thus, it is a single displacement reaction.

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answer

13. the molar mass of O2 is 32 g/mol

conversion: 2 mols x 16 g/mol = 32 g

14. there are 2 mols of water produced and this equals:

2 mols x 18 g/mol = 36 g

Answer:

0.392 moles of KNO3.

Explanation:

To find the moles of a solute based on the volume and concentration of a solution, we use the following formula:

The given data is: molarity = 0.560 M and volume (liters of solution) = 0.70 L. So, let's solve for 'moles of solute' and replace the values that we have. The solute in this case, would be KNO3:

We're going to use 0.392 moles of KNO3 to prepare 0.70 L of a 0.560 M solution.

In this diagram, we have a reaction occurring and 3 letters that represent Reactants, Activation Energy and Products. To determine which is which, first, we will almost always have the Activation Energy in the middle of the reaction, this is how much energy is required for the reaction to occur, therefore Activation Energy is represented by letter B

To determine the total change in enthalpy, we need to subtract the sum of all the enthalpy from the products, which is letter C, and the sum of all the enthalpy from the reactants, which is letter A

ΔH = C - A

In this graph, we have the energy increasing and more energy on the products side, this means that an input of energy was required, this is the description of an Endothermic reaction, therefore the sign will be Positive

Answer and Explanation

(a) At constant temperature and volume the pressure of a gas is directly proportional to the number of moles of gas.

P = n (RT/V) where P is the pressure, n is the number of moles, R is the gas constant, T is the temperature and V is the volume

So when the pressure in increased, the volume will be decreased, meaning there will be less space in the container, this will lead to more collisions inside a container, meaning, the number of moles will be increased.

(b) Given: initial number of moles (n1) = 4.0 moles

initial pressure (P1) = 1.6 atm

Final number of moles (n2) = 3.0 moles

Required: Final Pressure (P2)

solution

P1/n1 = P2/n2

P2 = P1*n2/n1

P2 = 1.6 atm*3.0 moles/4.0 moles

P2 = 1.2 atm

To identify the limiting reactant, we use the coefficients of the reaction:

As you can see, we have 1.79 moles of NO, but we need 1.86 moles of NO according to the reaction. For this reason, NO is the limiting reactant since we need more than what we have.