Chpt 8 9th Grade

Question 1

Law of conservation of matter

Answer 1

Number and types of atoms on the left side must equal the right side

Question 2

Explain how to balance h2 + o2 = h20

Answer 2

2h2 + o2 = 2h20

Question 3

Chemical reactions that give off thermal energy

Answer 3

Endothermic

Question 4

Chemical reactions that absorb thermal heat

Answer 4

Endothermic

Question 5

4 factors that affect the rate of reaction

Answer 5

Increased temperature
Increased concentration
Increased surface area (by making proteins smaller)
Catalysts (compound that affects rate of reaction but doesn’t take place in reaction)

Question 6

4 types of chemical reactions

Answer 6

Combination
Decomposition
Single displacement
Double displacement

Question 7

Combination

Answer 7

2 or more smaller molecules combine to make one large one

Question 8

Decomposition

Answer 8

1 larger molecule breaks down into 2 or more smaller pieces

Question 9

Single displacement

Answer 9

To move and set apart

AB+C=AC+B

Question 10

Double displacement

Answer 10

2 set apart/change

AB+CD=AC+BD

Question 11

Acids?

Answer 11

Chemicals that will produce or donate a hydrogen ion(H+)

When they are placed in water they decompose

Question 12

Bases?

Answer 12

Also called alkalines they are the opposite of acid and they are a compound that provides hydroxide ions(OH-)
Caustic (basic)

Question 13

Acid + Base =

Answer 13

Salt + Water

Question 14

The neutral of the pH scale

Answer 14

7-pure water

Question 15

Explain indicators

Answer 15

It is a compound that changes it’s Mccullar shape based on its acid-base environment and then produces a color change because I can’t absorb different colors

Question 16

Explain end points

Answer 16

It is the pH value where the indicator changes color

Question 17

Organic chemistry

Answer 17

Compounds that contain carbon

Question 18

Hydrocarbons

Answer 18

Molecules that only have hydrogen and carbon

Carbon needs 4 bonds, hydrogen needs 1

Question 19

1-5 for carbon names

Answer 19

1. Meth
2. eth
3. prop
4. but
5. pent

Question 20

6-10 for carbon names

Answer 20

6. Hex
7. Hept
8. Oct
9. Non
10. Dec

Question 21

Names for single, double, and triple bonds

Answer 21

Single- alkANE
Double-alkENE
Triple-alkYNE

Question 22

Isomer

Answer 22

2 molecules of the same compound with a different shape

Question 23

Cyclo is when a carbon compound is ???

What is the name of the different way scientists draw these

Answer 23

In the shape of a circle

Aromatic compound

Question 24

Propanoic acid

Answer 24

When there’s an O and OH coming off of a compound

See notes

Question 25

Alcohols

Answer 25

Have -OH coming off and end in “nol”

Question 26

Explain how soaps work

Answer 26

Since like dissolves like water alone cannot dissolve fat and grease so when you put soap into the water the nonpolar end of the soup dissolves the nonpolar fat
These large molecules of fat emulsify into small molecules

Question 27

Polymer

Answer 27

Long chains of repeating chemical structures

Question 28

Esters

Answer 28

Have O coming off

Question 29

The rearranging or recombining of atoms or molecules to form new substances

Answer 29

Chemical reaction