matter unit assessment

Question 1

what is a physical property?

Answer 1

observed with senses, determined without destroying matter

Question 2

chemical properties

Answer 2

indicates how a substance reacts with something else, matter will be changed into new substance

Question 3

physical change

Answer 3

a change of size, shape, or state

no new substance is formed

Question 4

chemical change

Answer 4

a change in physical and chemical properties

a new substance is formed

Question 5

temperature

Answer 5

the amount of energy an object has in motion per molecule

Question 6

thermal energy

Answer 6

amount of energy something has depending on the temp of the object

Question 7

absolute zero

Answer 7

coldest temperature that can be reached, -237C

Question 8

waters boiling point

Answer 8

212F
100C
273.1K

Question 9

waters melting point

Answer 9

32F
0C
273.1K

Question 10

solid

Answer 10

does not flow, confined shape. set vol

Question 11

liquid

Answer 11

flows, takes shape of container, mol are as close together as solid, but have more energy

Question 12

gas

Answer 12

expands, flows like liquid, differing vol and shape, mol can completely break apart from one another

Question 13

plasma

Answer 13

when mol become so hot they split and break

Question 14

melting point

Answer 14

the temperature at which a solid turns into a liquid

Question 15

boiling point

Answer 15

the point at which a liquid turns into a gas or vice versa

Question 16

sublimation

Answer 16

when a solid turns directly into a gas, enough heat energy is added

Question 17

deposition

Answer 17

when a gas changes directly into a solid

Question 18

evaporation

Answer 18

when a liquid turns into a gas below its boiling point

Question 19

four indicators of a chemical change

Answer 19

color change
production of an odor
formation of gas
formation of a solid

Question 20

what happens to a temperature of a substance during a phase change?

Answer 20

it either increases or decreases

Question 21

how did the magnet model show that diff substances have different IF strengths?

Answer 21

because when you shook the magnets on different magnets faster or slower to represent energy, the magnets either stayed or spread

Question 22

how can one determine if an endothermic or exothermic phase change occurred?

Answer 22

when an object transfers it’s heat to another,it’s an exothermic reaction. when an object absorbs heat from another object, it’s an endothermic change.

Question 23

what are the factors that affect heat transfer

Answer 23

conductivity, temperature difference of materials, thickness of materials, area of the material
(CTTA)

Question 24

what is the difference between heat, specific heat, and temperature

Answer 24

heat is a form of energy, temperature is the amount of energy an object has per molecule, and specific heat is the amount of energy it takes to rise a materials temp by 1

Question 25

what role does kinetic energy play in dissolving a substance

Answer 25

while a solute dissolves in a solvent, the solvent is hitting the solute with enough kinetic energy and force to eventually break off molecules of the solute, surrounds it, and carries it away

Question 26

how can dissolving a substance affect the temp of a solution without chemical change taking place?

Answer 26

when a substance is broken apart through solvation, latisse energy is released and the solvent gains that energy, causing a change in temperature