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 properties.
• Both A and B
• None of the above.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

• True
• False

Tags

NGSS.MS-PS1-4

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

• true
• false

Tags

NGSS.MS-PS3-4

Substances that enter into a chemical reaction are called products.

• true
• false

Tags

NGSS.MS-PS1-2

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

• true
• false

Another name for a chemical change is a chemical bond.

• true
• false

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

• True
• False

Tags

NGSS.MS-PS1-4

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-PS1-2

NGSS.MS-PS1-5