Chemistry Part 2

Question 1

What is an endothermic reaction

Answer 1

Endothermic reactions require energy and are on the reactant side.

Question 2

What is an exothermic reaction

Answer 2

Exothermic reactions release energy and are on the product side. (May need energy to start)

Question 3

Why are exothermic reactions more dangerous?

Answer 3

Because we don’t have control over the size of the reaction like we do over endothermic reactions. Exothermic reactions can’t be controlled by a dial.

Question 4

What type of reaction are the following?

• coking an egg
• photosynthesis
• ice melting

Answer 4

Endothermic

Question 5

What type of reaction are the following?

• fireworks
• explosions
• sodium in water creates bubbles

Answer 5

Exothermic

Question 6

Single displacement?

Answer 6

One element takes the place of another element in the compound

A+Bx—>AX+B

Question 7

Double displacement

Answer 7

The cations of 2 compounds exchange places forming 2 new compounds.

AX+BY—>BX+AY

Question 8

Synthesis

Answer 8

2 or more reactants combine to form a new product.

A+B—>AB

Question 9

Decomposition

Answer 9

A compound breaks down into 2 or more similar compounds are elements

Question 10

Neutralization

Answer 10

Acid+Base—-> Salt +water

Question 11

Acids

Answer 11

A substance the produces hydrogen ions

Starts with H

Question 12

Base

Answer 12

A substance that produces hydroxide ions

Ends with OH

Question 13

Indicator

And examples

Answer 13

A chemical that changes colour when the concentration of H+ or OH- changes

Litmus
Phenolphthalein 
Bromothymol  blue 
Methyl violet 
Ph paper

Question 14

Properties of acids

Answer 14

Sour taste
Corrosive
Turns red with litmus
Stays clear with phenophtalein

Question 15

Properties of bases

Answer 15

Tastes bitter
Soapy
Turns blue with litmus
Turns pink with phenolphthalein

Question 16

Biological settings

Answer 16

Stomach acid - HCl
Pancreatic fluid- sodium bicarbonate
Citrus acid

Question 17

Domestic

Answer 17

Window cleaner — NH3
Drain cleaner—> NaOH
PICKLES - acetic acid

Question 18

What is H2SO4

Answer 18

Sulfuric acid

Question 19

What’s HNO3

Answer 19

Nitric acid

Question 20

What’s calcium hydroxide

Answer 20

CaOH2

Question 21

What’s NH3

Acid or base

Answer 21

Ammonia

Base

Question 22

0-6=

Answer 22

Acid

Question 23

8-14

Answer 23

Base

Question 24

7=

Answer 24

Pure water

Question 25

Sections of a lab report

Answer 25

Hypothesis
Procedure
Data and observation
Analysis
Conclusion

Question 26

Daltons atomic theory

Answer 26

1. Everything is made out of atoms
2. atoms can’t be created or destroyed
3. All atoms of same element have same mass and size.
4. compounds are formed by elements combining in certain ratios.

Question 27

Polyatomic ions

Answer 27

(OH)-1 hydroxide
(Po4)-3 phosphate 
(So4)-2 sulfate 
(Co3)-2 carbonate 
(No3)-1 nitrate
(NH4) ammonium

Question 28

Indicator results for litmus

Answer 28

Acid -red

Base- blue

Question 29

Indicator results for phenopthalein

Answer 29

Acid : clear base: pink

Question 30

Bromothymol blue

Answer 30

Acid:yellow
Base:blue

Question 31

Methyl violet

Answer 31

Acid green base violet