Science (Chemistry)

Question 1

What is the law of conservational energy?

Answer 1

The law of conservational energy states that energy cannot e create or destroyed only transferred.

Question 2

What is the symbol for hydrochloric acid?

Answer 2

HCL

Question 3

What is the symbol for calcium carbonate/limestone

Answer 3

CACO3

Question 4

What is a factor that affects the rates of reaction?

Answer 4

Temperature: gives particles more kinetic energy so that they can collide more frequently and forcefully meaning more particles can overcome the activation energy hence, increasing the rate of reaction

Question 5

What is a chemical reaction?

Answer 5

In order for the particles to react they must collide to make the product therefore, a chemical reaction is the process of reactant particles turning into product particles.

Question 6

What is activation energy?

Answer 6

the minimum amount of energy needed to break the bonds for a reaction to occur.

Question 7

What are reactants?

Answer 7

Reactants are the particles we start with in a chemical reaction

Question 8

What are products?

Answer 8

Chemicals you end up with in a chemical reaction

Question 9

True or False?: creating new bonds releases energy

Answer 9

True

Question 10

True or False?: breaking bonds takes in energy?

Answer 10

True

Question 11

What is -delta H?

Answer 11

-Delta H is the overall energy in a exothermic reaction which means energy exits

Question 12

What is +Delta H?

Answer 12

+Delta H is the overall energy in an endothermic reaction meaning energy enters

Question 13

What is an exothermic reaction?

Answer 13

It is a chemical reaction that feels warm or hot to the touch

Question 14

What is an endothermic reaction?

Answer 14

It is a chemical reaction that feels cold to the touch

Question 15

What is the unit of measurement for energy?

Answer 15

Joules (j) kilojoules (kj)

Question 16

What is diffusion?

Answer 16

Diffusion is the movement of
Particles
from an area of
high concentration to an area of low concentration in Liquids and gasses (fluids).

Question 17

What is latent heat?

Answer 17

Latent heat is the energy used to break the bonds so the temperature doesn’t increase

Question 18

What are the three states of matter

Answer 18

Solid,liquid,gas

Question 19

What is melting?

Answer 19

Melting is the process of a solid changing to a liquid (e.g ice to water)

Question 20

What is vaporisation?

Answer 20

Vaporisation is when a liquid changes to a gas (e.g water to steam)

Question 21

What is sublimation?

Answer 21

Sublimation is the process of a solid to gas (iodine(solid) to iodine(gas)

Question 22

What is evaporation?

Answer 22

Evaporation is vaporisation but only on the surface of a liquid

Question 23

What is boiling?

Answer 23

Boiling is vaporisation on the surface of the liquid as well as within the liquid

Question 24

What is condensation?

Answer 24

Condensation is the change from gas the liquid

Question 25

How do catalysts affect the rate of reaction?

Answer 25

catalysts lower the activation energy by breaking the bonds providing an alternative pathaway meaning particles can collide more frequently hence increasimg the rate of reaction

Question 26

How does concentration affect the rate of reaction?

Answer 26

if something has a higher conerntration it means that there are more particles in a certain area of the solution meaning it is more crowded so particles are able to colide more frequently hence increasing the rate of reaction

Question 27

How does surface area affect the rate of reaction?

Answer 27

You can increase the surface area of an object by cutting it up into smaller pieces. This means that there are more exposed particles to collide with meaning particles can collide more frequently hence increasing the rate of reaction