Exploring Physical vs Chemical Changes

What defines a physical property of a substance?

• Properties that alter the physical state of a substance

• Properties that can only be observed during a chemical reaction

• Characteristics that change the chemical identity of a substance

• Characteristics observed without changing the substance chemically

Which property would describe how a substance reacts with oxygen?

• Physical property

• Chemical property

• Intrinsic property

• Extrinsic property

Tags

NGSS.MS-PS1-2

Which of the following is an example of a physical change?

• Burning a piece of wood

• Mixing acid and base

• Melting ice into water

• Rusting of iron

Tags

NGSS.MS-PS1-4

What happens to celery when it is cut into smaller pieces?

• It reacts with the air

• It undergoes a chemical change

• It remains chemically the same

• It becomes a different substance

What is a key indicator of a chemical change?

• Change in size or shape

• Change in state from solid to liquid

• Production of gas or change in color

• Reduction in temperature

Tags

NGSS.MS-PS1-2

What is produced when potassium metal reacts with water?

• A physical change

• A decrease in temperature

• An explosion

• A change in color

Tags

NGSS.MS-PS1-2

What does the arrow in a chemical equation symbolize?

• The direction of heat flow

• The yield or production of new substances

• The mixing of reactants

• The stability of the products

Tags

NGSS.MS-PS1-5

What role does a catalyst play in a chemical reaction?

• It is consumed completely

• It slows down the reaction

• It acts as a reactant

• It speeds up the reaction without being consumed

What does the triangle symbol over an arrow in a chemical equation indicate?

• The addition of heat to the reaction

• The production of a gas

• The reaction is reversible

• The need for a catalyst

According to the law of conservation of mass, what happens to the mass in a chemical reaction?

• Mass is doubled

• Mass is reduced

• Mass is conserved

• Mass is increased

Tags

NGSS.MS-PS1-5