Chemical Reactions

Question 1

Which polyatomic ions have charge -2?

Answer 1

Sulfate and Carbonate

Question 2

Which polyatomic ions have charge of-3

Answer 2

Phosphate

Question 3

Properties of acids

Answer 3

Are sour
Often react with metals to form H2
React with carbonates

Question 4

Properties of bases

Answer 4

Are bitter
Slippery touch
Do not react with carbonates

Question 5

What is the Ph scale?

Answer 5

Measuring of how acidic/basic a substance is.

Lower the number- more acidic

Question 6

What do acids and bases form?

Answer 6

Salt + Hydrogen Gas

Question 7

What do acid and metal reactions form?

Answer 7

Salt + hydrogen gas

Question 8

What do acid and carbonate reactions form?

Answer 8

Salt+ carbon dioxide+ water

Question 9

What is a precipitate

Answer 9

A substance deposited in solid form from a solution

Question 10

What is a spectator ion?

Answer 10

ions that are present during the reaction but are unchanged by the reaction

Question 11

What is the word equation for combustion?

Answer 11

Hydrocarbon fuel+ oxygen= carbon dioxide + water
eg. ethene + oxygen= carbon dioxide + water
C2H4 + 02 = 2Co2 + 2H2o

Question 12

What is combustion?

Answer 12

The rapid reaction of a substance, usually a fuel with oxygen gas to protect heat

Question 13

What are polyatomic ions?

Answer 13

Ions formed of a number of different atoms which are chemically bound together and act as a unit.
Eg. hydroxide: OH-
carbonate: CO32-
sulfate: SO42-

Question 14

When does combustion occur?

Answer 14

When a fuel exothermically reacts with oxygen
Equation- Fuel + O2 → CO2 + H2O
Eg.

CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g)