chem test - chemical reactions

Question 1

what is the state symbol for gas?

Answer 1

G

Question 2

what is the state symbol for solid?

Answer 2

S

Question 3

what is a physical change?

Answer 3

involves a change in state

Question 4

what is a chemical change?

Answer 4

involves a formation of one or more substances

Question 5

what are the 5 signs of a chemical reaction?

Answer 5

1. colour change
2. energy/temperature change
3. precipitate formed
4. gas produced
5. a substance disappearing but NOT dissolving

Question 6

what is the state symbol for liquid?

Answer 6

L

Question 7

what is the state symbol for adding water to a solution?

Answer 7

AQ

aqueous

Question 8

what is the gas test for hydrogen?

Answer 8

makes a lit splint pop

Question 9

what is the gas test for oxygen?

Answer 9

relights a glowing splint

Question 10

what is the gas test for carbon dioxide?

Answer 10

turns limewater from clear to cloudy

Question 11

what is a solute?

Answer 11

a solute is the substance being dissolved to make a solution

Question 12

what is a solution?

Answer 12

a solution is made when something soluble dissolves in another substance

Question 13

what is a solvent?

Answer 13

a solvent is used to dissolve the solute.

Question 14

how does temperature affect reaction rates?

Answer 14

the higher the temperature the shorter the reaction time.

heat makes the experiment faster.

Question 15

how does temperature affect reaction rates?

Answer 15

the higher the temperature the faster the experiment goes.

increasing the temperature makes collisions more likely and gives the particles more energy.

Question 16

how does concentration affect reaction rates?

Answer 16

the higher the concentration the faster the reaction goes.

higher concentration = higher chance of particles colliding.

Question 17

how does particle size affect reaction rates?

Answer 17

smaller particles increase chances of collisons making the reactions faster.