Chemistry #2

Question 1

Radiation

Answer 1

An unstable nucleus emits excess energy as radiation in the form of gamma rays or fast-moving sub-atomic particles

Question 2

Exothermic

Answer 2

describes chemical reactions that give out heat energy to the surroundings

Question 3

Endothermic

Answer 3

describes chemical reactions that absorb heat energy from the surroundings

Question 4

State

Answer 4

the condition in which matter exists

Question 5

(L)

Answer 5

liquid

Question 6

(g)

Answer 6

gas

Question 7

(aq) / aqueous

Answer 7

aqueous - dissolved in water

Question 8

(s)

Answer 8

solid

Question 9

Reactants

Answer 9

what is being formed by a chemical reaction

Question 10

product

Answer 10

it is what is formed after a chemical reation

Question 11

precipitate

Answer 11

an insoluble solid that emerges from a liquid solution

Question 12

Law of Conservation of Mass

Answer 12

law that states that, in a chemical reaction, the total mass of the reactants is the same as the total mass of the products

Question 13

Law of Constant Proportions

Answer 13

law that states that, in chemical compounds, the ratio of the elements is always the same

Question 14

Chemical Process

Answer 14

a reaction that changes the arrangement of the atoms or molecules of the substances involved

Question 15

Chemical Energy

Answer 15

energy stored in chemical bonds that is released during chemical reactions

Question 16

Synthesis Reaction

Answer 16

Synthesis reactions occur when two chemicals combine to form one larger chemical

Question 17

Decomposition Reaction (opposite of synthesis reaction)

Answer 17

Decomposition Reactions occur when one chemical breaks up to form two or more smaller chemical

Question 18

Combustion Reactions

Answer 18

If you’ve got something organic (something that contains both carbon and hydrogen atoms) that reacts with oxygen to form carbon dioxide and water vapour (plus lots of energy).

Question 19

Single Displacement Reactions

Answer 19

Single displacement reactions occur when the atoms of a pure element replace those of an element in a chemical compound.

Question 20

Double Displacement Reaction (precipitation reaction)

Answer 20

A Double Displacement Reaction is when the cations of two ionic compounds switch places.

Question 21

Acid-Base Reactions

Answer 21

Acid_Base reactions are just double displacement reactions in which water is formed. Example: When you eat chili and use milk to cancel out the stomach pain, which is a Acid-Base reaction