Chemical Reactions

A candle wick burning is an example of a _________________________

• physical reaction
• condensation
• neutrons
• chemical reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a ___________change, a substance changes into a new substance with new properties.

• Physical

• Chemical

Which of these is NOT a sign that a chemical change has occurred?

• Change in shape.

• An unexpected color change

• A temperature change

• The formation of a precipitate (solid)

You know that a chemical reaction has occurred if

• there is a precipitate (new solid)

• there is a color change.

• there is a temperature change.

• All of these answers are evidence.

Tags

NGSS.MS-PS1-2

What indicates a chemical reaction occurred?

• change in temperature

• gas (bubbles) produced

• color change

• all of the above

A(an) ______ is the number that appears before a formula in a chemical equation.

• subscript

• coefficient

• ratio

• denominator

Which of the following is a physical change?

• Getting a haircut

• Rusty metal

• A compound

• sour milk

the starting materials in a chemical reaction

• Products
• Reactants
• Starters
• Enders

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In chemical reactions, what does the Law of Conservation of Matter mean?

• Matter is not created or destroyed.

• The total mass of the reactants is greater than the total mass of the products.

• The total mass of the reactants is less than the total mass of the products.

• Matter is not changed.

Tags

NGSS.MS-PS1-5

The substances listed on the right side (after the arrow) of a chemical equation are the

• Yields

• Reactants

• Products

• Precipitates