Unit 3 Test

Question 1

5 basic types of reactions

Answer 1

-synthesis
-decomposition
-combustion
-single displacement
-double displacement

Question 2

what is a nuclear reaction

Answer 2

changes that occur within the nucleus of atom
*number of protons and neutrons change
*Involve large amounts of energy

Question 3

What happens during nuclear reactions

Answer 3

Radioactive particles are unstable and decay

Question 4

what types of radioactive decay is there

Answer 4

-alpha decay (alpha particles released)
-beta decay (beta particles released)

*extra energy released as gamma rays

Question 5

what is fission

Answer 5

large nucleus splits into smaller nuclei

ex: nuclear power plants

Question 6

What is fusion

Answer 6

smaller nuclei combining to form a larger nucleus

ex: H to He in the sun

Question 7

what is a dissociation equation

Answer 7

when you put an ionic compound into water

Question 8

what are total net ionic equations used for

Answer 8

reactions that occur in water

Question 9

what are total ionic equations used for

Answer 9

show all high solubility ionic compounds in their dissociation form

Question 10

what are net ionic equations used for

Answer 10

shows only ions or neutral substances involved in the overall chemical reaction

Question 11

what is a limiting reagent

Answer 11

the reactant that is completely consumed in a chemical reaction

Question 12

what is an excess reagent

Answer 12

-the reactant that you have leftover
- should be atleast 10% extra to ensure all limiting reagents react

Question 13

what does the limiting reagent determine?

Answer 13

determines how much of each product you can make

Question 14

what indicated a limiting reactant problem

Answer 14

mass of both reactants given

Question 15

what does theoretical yield predict

Answer 15

the amount of product predicted based on calculations from the balanced equation

Question 16

what is actual yeild

Answer 16

the amount of product actually produced in the experiment

Question 17

what is percent yield

Answer 17

the ratio expressed as a percentage of the actual amount of product divided by the max. possible amount of product

Question 18

what are the mechanisms of chemical change

Answer 18

-kinetic molecular theory
-collison reaction theory
-catalyst

Question 19

what is kinetic molecular theory

Answer 19

all matter is made up of particles in continuous random motion

Question 20

what is collison reaction theory

Answer 20

-chem reactions involve collision and rearrangement of of atoms or groups of atoms
-if collisions occur with enough energy in the right orientation, reactions can occur

Question 21

what is catalyst

Answer 21

a substance that speeds up chemical reaction without being permanently changed

Question 22

what is water

Answer 22

a universal solevant

Question 23

what is an ion that does not change called

Answer 23

spectator ion

Question 24

what is mutallurgy

Answer 24

-extracting metals from their ore and processing them into useful form
-physical and chem process