Chapter 4

Question 1

What occurs to the bonds between atoms of the reactants during chemical changes?

Answer 1

They are broken and new ones are formed

Question 2

What are the signs indicating a chemical change?

Answer 2

• release of gas
• emission/absorption of heat
• emission of light
• change in colour
• formation of a precipitate

Question 3

The law of conservation of mass states that in any chemical reaction the total mass of ________ = ?

Answer 3

Total mass of reactants=total mass of products

Question 4

What is the formula for a neutralization reaction?

Answer 4

Acid+Base=Salt+Water

USE LEWIS DOT STRUCTURE

Question 5

What is the formula for a combustion reaction?

Answer 5

Fuel+Oxygen=Carbon dioxide+water+energy

Question 6

What 3 factors are needed for a fire to start?

Answer 6

Oxygen, fuel, heat

Question 7

Which of the 3 factors needed to start a fire actually goes through combustion?

Answer 7

Fuel

Question 8

What is ignition temperature?

Answer 8

Min. temp. for combustion to happen

Question 9

What is the oxidizing agent?

Answer 9

Substance that allows the fuel to ignite

Question 10

What is the formula for a photosynthesis reaction?

Answer 10

Carbon dioxide+water+sun energy= sugar/glucose+oxygen

Question 11

What is the formula for a cellular respiration reaction?

Answer 11

Oxygen+sugar/glucose= carbon dioxide+water+energy