Question 4

Question

A)


Based on the differences in electronegativities, with which atom is cesium (Cs) most likely to form an ionic bond?

(1 point)
Responses

Cs-At = 1.4
Cs-At = 1.4

Cs-I = 1.8
Cs-I = 1.8

Cs-Cl = 2.3
Cs-Cl = 2.3

Cs-S = 1.8
Cs-S = 1.8
Question 5
A)Which statement is the best description of the energy found in molecules of water?(1 point)
Responses

Hotter molecules have more kinetic energy.
Hotter molecules have more kinetic energy.

A molecule's temperature is not connected to its energy.
A molecule's temperature is not connected to its energy.

Colder molecules have more kinetic energy.
Colder molecules have more kinetic energy.

Colder molecules have more thermal energy.
Colder molecules have more thermal energy.
Question 6
A)When potassium permanganate and glycerol react, the potential energy of the products is less than the potential energy of the reactants. Which statement about this reaction is correct?(1 point)
Responses

The reaction is exothermic.
The reaction is exothermic.

The reaction is endothermic.
The reaction is endothermic.

The activation energy of the system is negative.
The activation energy of the system is negative.

The total potential energy of the system is constant.
The total potential energy of the system is constant.
Question 7
A)Hydrochloric acid and sodium hydroxide react to produce water and sodium chloride in an endothermic reaction. Which statement must be true of the reaction?(1 point)
Responses

The energy of each bond in water and sodium chloride is greater than the energy of each bond in hydrochloric acid and sodium hydroxide.
The energy of each bond in water and sodium chloride is greater than the energy of each bond in hydrochloric acid and sodium hydroxide.

The bond energy used to break the bonds in hydrochloric acid and sodium hydroxide is less than the energy released to form the bonds in water and sodium chloride.
The bond energy used to break the bonds in hydrochloric acid and sodium hydroxide is less than the energy released to form the bonds in water and sodium chloride.

More bond energy is absorbed on the reactants side than is released on the products side.
More bond energy is absorbed on the reactants side than is released on the products side.

The total bond energy of water and sodium chloride is greater than the total bond energy of hydrochloric acid and sodium hydroxide.
The total bond energy of water and sodium chloride is greater than the total bond energy of hydrochloric acid and sodium hydroxide.
Question 8
A)
Imagine a graph. The x-axis is labeled "Time" and is measured in seconds, and the y-axis is labeled "Potential Energy" and is measure in kilojoules (kJ). The slope starts at 0 seconds and a plateau at 25 kJ. This plateau is labeled "Reactants." The slop then rises to a peak labeled "Activation Energy" at 78kJ. Finally the slop drops to a plateau at 14kJ and is labeled "Products."

What does the graph described above represent?

(1 point)
Responses

Rate of reaction graph
Rate of reaction graph

A phase change graph
A phase change graph

An endothermic reaction
An endothermic reaction

An exothermic reaction
An exothermic reaction
Question 9
A)Endothermic reactions absorb a lot of energy. Exothermic reactions give off a lot of energy. Which type of reaction has a higher activation energy? Which one takes more energy to break up the bonds of the reactants?(1 point)
Responses

Exothermic reactions have a higher activation energy. Exothermic reactions require more energy to break up the bonds of the reactants.
Exothermic reactions have a higher activation energy. Exothermic reactions require more energy to break up the bonds of the reactants.

Exothermic reactions have a higher activation energy. Endothermic reactions require more energy to break up the bonds of the reactants.
Exothermic reactions have a higher activation energy. Endothermic reactions require more energy to break up the bonds of the reactants.

Endothermic reactions have a higher activation energy. Exothermic reactions require more energy to break up the bonds of the reactants.
Endothermic reactions have a higher activation energy. Exothermic reactions require more energy to break up the bonds of the reactants.

Endothermic reactions have a higher activation energy. Endothermic reactions require more energy to break up the bonds of the reactants.
Endothermic reactions have a higher activation energy. Endothermic reactions require more energy to break up the bonds of the reactants.
Question 10
A)Why is thermal energy (heat) required to freeze ice into crystals?(1 point)
Responses

Heat must be absorbed by the reactants and the products.
Heat must be absorbed by the reactants and the products.

Heat must be released by the products in order to convert from the reactants.
Heat must be released by the products in order to convert from the reactants.

Heat must be absorbed by the products in order to convert from the reactants.
Heat must be absorbed by the products in order to convert from the reactants.

Heat must be released by the reactants and the products.
Heat must be released by the reactants and the products.
Question 11
A)
Cobalt ions form complex ions with water and chloride as shown in the reaction. The left side of the reaction is pink, and the right side of the reaction is blue.

Co(H2O)62+ + 4Cl−+heat ⇌ CoCl42−+6H2O

Which statement about the system at equilibrium is correct?

(1 point)
Responses

Cooling a purple solution will turn it pink.
Cooling a purple solution will turn it pink.

Adding hydrogen chloride (HCl) to a blue solution will turn it purple.
Adding hydrogen chloride (HCl) to a blue solution will turn it purple.

Adding water to a purple solution will turn it blue.
Adding water to a purple solution will turn it blue.

Heating a blue solution will turn it purple.
Heating a blue solution will turn it purple.
Question 12
A)Why are rubber and metal both useful while making wire?(1 point)
Responses

Both are flexible, but one conducts electricity while the other insulates.
Both are flexible, but one conducts electricity while the other insulates.

Both are good insulators, but one is flexible while the other is rigid.
Both are good insulators, but one is flexible while the other is rigid.

Both are good insulators, but one is more ductile than the other.
Both are good insulators, but one is more ductile than the other.

Both are flexible, but one reflects electromagnetic waves well while the other transmits them.
Both are flexible, but one reflects electromagnetic waves well while the other transmits them.
Question 13
A)
Use the reaction to answer the question.

Fe2O3+3H2SO4

How many atoms of oxygen will be found in the product(s) of the reaction?

(1 point)
Responses

12
12

4
4

15
15

3
3
Question 14
A)
Use the table and equation to answer the question

Element Atomic Mass (amu)
hydrogen 1
carbon 12
oxygen 16
CH4+2O2→ CO2+2H2O

The law of conservation of matter states that matter cannot be crated nor destroyed. How does the balance equation above demonstrate this law?

(1 point)
Responses

The number of atoms, type of elements, and mass of reactants and products are equal.
The number of atoms, type of elements, and mass of reactants and products are equal.

The number of molecules, number of atoms, and type of elements are equal.
The number of molecules, number of atoms, and type of elements are equal.

The number of molecules, types of elements, and mass of reactants and products are equal.
The number of molecules, types of elements, and mass of reactants and products are equal.

The number of molecules, number of atoms, and mass of reactants and products are equal.
The number of molecules, number of atoms, and mass of reactants and products are equal.

Answer 1

Here are the correct answers to your questions based on the information provided:

Question 4: A) Based on the differences in electronegativities, with which atom is cesium (Cs) most likely to form an ionic bond?

• Answer: Cs-Cl = 2.3 (A higher difference indicates a stronger likelihood of forming an ionic bond.)

Question 5: A) Which statement is the best description of the energy found in molecules of water?

• Answer: Hotter molecules have more kinetic energy. (Kinetic energy of molecules increases with temperature.)

Question 6: A) When potassium permanganate and glycerol react, the potential energy of the products is less than the potential energy of the reactants. Which statement about this reaction is correct?

• Answer: The reaction is exothermic. (Exothermic reactions release energy, resulting in products with lower potential energy.)

Question 7: A) Hydrochloric acid and sodium hydroxide react to produce water and sodium chloride in an endothermic reaction. Which statement must be true of the reaction?

• Answer: More bond energy is absorbed on the reactants side than is released on the products side. (In an endothermic reaction, the energy required to break the bonds exceeds the energy released forming product bonds.)

Question 8: A) What does the graph described above represent?

• Answer: An endothermic reaction. (The reactants have lower potential energy than the products, indicating that energy is absorbed.)

Question 9: A) Which type of reaction has a higher activation energy? Which one takes more energy to break up the bonds of the reactants?

• Answer: Endothermic reactions have a higher activation energy. Endothermic reactions require more energy to break up the bonds of the reactants. (Endothermic reactions typically entail more energy input to initiate.)

Question 10: A) Why is thermal energy (heat) required to freeze ice into crystals?

• Answer: Heat must be released by the reactants in order to convert from the reactants. (The process of freezing involves the removal of heat.)

Question 11: A) Which statement about the system at equilibrium is correct?

• Answer: Cooling a purple solution will turn it pink. (Shifting the equilibrium left with a decrease in temperature favors the pink side.)

Question 12: A) Why are rubber and metal both useful while making wire?

• Answer: Both are flexible, but one conducts electricity while the other insulates. (Rubber insulates; metal conducts.)

Question 13: A) How many atoms of oxygen will be found in the product(s) of the reaction?

• Answer: 12 (In the reaction equation, there are 6 H2O contributing 6 oxygens and 6 CO2 contributing 12 oxygens total.)

Question 14: A) How does the balance equation above demonstrate the law of conservation of matter?

• Answer: The number of atoms, type of elements, and mass of reactants and products are equal. (This is a correct demonstration of the law of conservation.)

Feel free to ask more questions if you need further assistance!