Observing Chemical Change

Which of the following is true about chemical reactions?

• They are accompanied by changes in energy

• They form new substances with new peoperties

• both A and B

• neither A nor B

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In an endothermic reaction, energy is

• absorbed

• released

• converted to mass

• synthesized

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

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

Tags

NGSS.MS-PS1-5

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

• False: less

• True

Tags

NGSS.HS-PS1-4

Water boils at  $100\degree$  C. This is an example of a chemical property.

• True

• False: physical

Substances that enter into a chemical reaction are called

• Products

• Reactants

Tags

NGSS.MS-PS1-2

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

• True

• False: physical

Another name for a chemical change is a chemical bond.

• True

• False: reaction

Tags

NGSS.MS-PS1-2

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

• True

• False: produces a new substance