Chemical Reactions - Scope Practice

A candle wick burning is an example of a _________________________

• physical reaction
• condensation
• neutrons
• chemical reaction

In a ___________change, a substance changes into a different substance.

• Physical
• Chemical

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

• Change in shape.

• An unexpected color change

• An unexpected temperature change

• The formation of a precipitate

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 you didn't cause.

• All of these answers are evidence.

When a candle melts, it is a ___________________  change.

• chemical
• physical
• transparent
• undefined

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

• subscript

• coefficient

• ratio

• denominator

1. How is a chemical change different from a physical change?

• there is no difference

• a physical change creates a new substance

• a chemical change creates a new substance

the starting materials in a chemical reaction

• Products
• Reactants
• Starters
• Enders

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.

The substances listed on the right side of a chemical equation are the

• Yields
• Reactants
• Products
• Precipitates