Evidence of a Chemical Reaction Quizizz and Video

What is a chemical reaction?

• A process where physical forms change

• A process where elements combine to form a mixture

• A process where chemicals react to form new substances

• A process where substances dissolve in water

What happens during the electrolysis of water?

• Water separates into hydrogen and oxygen gases

• Water is purified

• Water changes its temperature

• Water turns into a solid

What is the result of burning steel wool in oxygen?

• It glows and produces energy

• It produces water

• It dissolves

• It turns into a liquid

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4

What are the products when hydrogen and oxygen recombine?

• Carbon dioxide and water

• Water vapor and energy

• Salt and water

• Oxygen and hydrogen gas

Tags

NGSS.HS-PS1-7

What are the 5 pieces of evidence stated from the video that indicates a chemical reaction has occurred?

Answer explanation

1. 1. There must be a release of a Gas.

2. 2. A change in Temperature must occur.

3. 3. There must a change in color.

4. 4. The formation of a precipitate.

5. 5. Energy is released in the form of light or sound.

Tags

NGSS.HS-PS1-7

How can temperature change signify a chemical reaction?

• It only increases, never decreases

• It indicates a physical change

• It can either increase or decrease

• It remains constant

Tags

NGSS.HS-PS1-5

What does the formation of a precipitate indicate?

• A chemical reaction producing a solid from liquids

• A physical mixture has formed

• Gases are released from the solution

• The temperature of the solution has changed

What form of energy is often released during chemical reactions?

• Mechanical

• Gravitational

• Magnetic

• Light or sound

Tags

NGSS.HS-PS1-4