Question

1. Which form of energy changes in chemical reactions due to bonds breaking and forming? (1 point)

activation
potential
thermal
kinetic

2. What does it mean for a reaction to release energy? (1 point)

The relative potential energy of the reaction is positive.
The relative potential energy of the reaction is negative.
The activation energy of the reaction is positive.
The activation energy of the reaction is negative.

3. Heat is added to a chemical system. Which energy will increase? (1 point)

the relative potential energy of the system
the potential energy of the products
the activation energy of the system
the kinetic energy of the reactant molecules

4. Carbon monoxide and nitrogen monoxide react to produce carbon dioxide and nitrogen gas. If the system contains platinum, then less energy is required for the reaction to occur. Which term best describes the role of platinum in the system? (1 point)

reactant
energy
product
catalyst

5. The two oxygen atoms in a molecule of oxygen gas share their outer electrons. Which type of bond do the oxygen atoms form? (1 point)

ionic
exothermic
endothermic
covalent

Answer 1

Answer:

1. exothermic

The relative potential energy of the reaction is positive.increases the internal energy of the system.

Answer 2

Answer:

1. potential energy
2. relative potential energy of a reaction
3. the kinetic energy of the reacting molecules increases.
4. catalyst
5. covalent bond

Explanation:

A chemical profile diagram shows the energy changes of atoms as bonds are formed.

1. In chemical reactions, species change potential energy by breaking and forming bonds.
2. The relative potential energy of a reaction is negative when the reaction releases energy. The reaction is said to be exothermic.
3. When heat is added to a chemical system, the kinetic energy of the reacting molecules increases.
4. A catalyst is a substance that reduces the activation energy required for a reaction by providing an alternative reaction pathway. It is therefore a catalyst that lowers the energy required for the reaction of carbon monoxide and nitric oxide.
5. The type of bond that exists when two oxygen atoms in an oxygen molecule share electrons is a covalent bond. The type of bond that exists when two oxygen atoms in an oxygen molecule share electrons is a covalent bond.

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