Chemical Reactions Quiz 1

Which of the following is true about chemical reactions?

• They are accompanied by changes in energy.
• They form new substances with new properties.
• both
• neither

In an endothermic reaction, energy is

• absorbed
• released
• converted to mass
• synthesized

Which of the following is NOT a physical property?

• melting point
• state of matter
• density
• flammability

Substances formed as a result of a chemical reaction are called

• catalysts
• precipitates
• products
• reactants

In an exothermic reaction, products have more energy than reactants.

• True
• False, the same
• False, less
• False, twice as much

Water boils at 100°C. This is an example of a chemical property.

• True
• False, metallic
• False, physical
• False, thermal

Substances that enter into a chemical reaction are called products.

• True
• False, reactants
• False, elements
• False, compounds

The ability to react with oxygen is an example of a chemical property.

• True
• False, physical
• False, metallic
• False, endothermic

Another name for a chemical change is a chemical bond.

• True
• False, product
• False, reaction
• False, compound

In a physical change, some of the physical properties of the substance may be altered and the chemical composition remains the same.

• True
• False, changes slightly
• False, is reduced
• False, is rearranged