Chapter 8,lesson 1Chemical Reaction

Question 1

Indicators of Chemical Reaction:

Answer 1

1 Transfer of energy (cause the surrounding to heat or cool.2 Release light.3 color change.4 evidence of a precipitate (particles from by the reaction and settle at the bottom).5 gas production

Question 2

Chemical reaction:

Answer 2

Some chemical reaction are so small that it may be difficult to see an indicator.No matter how slight the change,a chemical reaction still has occurrieds

Question 3

Reactivity:

Answer 3

The ability of element to take part in a chemical reaction.

Question 4

Reactant:

Answer 4

An original substance at the beginning of a chemical reaction.Example:baking soda

Question 5

Product:

Answer 5

A new substance resulting from (made by )a chemical change.Example:Fire+wood=ashes

Question 6

Precipitate:

Answer 6

The soils product of a chemical reaction in a solution.

Question 7

Chemical Reaction:

Answer 7

A change or reaction that creates a new kind of matter (product)with different properties from the original matter.(reactant)