Observing Chemical Reactions

Which of the Following is true about chemical reactions?

• A: They are accompanied by changes in energy

• B: They form new substances with new properties

• both A and B are correct

• Neither A or B are correct

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 (does it catch on fire)

Substances formed as a result of chemical reactions are called?

• products

• reactants

• catalysts

• precipitates

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

True or false: in an exothermic reaction, products have more energy than the reactants?

• true

• false

Tags

NGSS.HS-PS1-4

True or false: Water boils at 100 C⁰. This is an example of a chemical property.

• true

• false

Tags

NGSS.MS-PS1-4

true or false: Substances that react with each other to complete a chemical reaction are called reactants.

• true

• false

Tags

NGSS.MS-PS1-1

The ability to react with oxygen is a chemical property.

• true

• false

Tags

NGSS.MS-PS1-1

true or false: another name for a chemical change is a chemical bond.

• true

• false

Tags

NGSS.MS-PS1-1

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

• true

• false

Tags

NGSS.MS-PS1-4