science chapter 2-3 fill in the blank

Question 1

matter that always has exactly the same composition is classified as a _____ ______

Answer 1

pure substance

Question 2

pure substances are either _____ or ______

Answer 2

element, compound

Question 3

an element has a fixed composition because it contains only one type of _____

Answer 3

atom

Question 4

the symbols for elements have either ____ or _____ letters

Answer 4

one, two

Question 5

a compound can be made from two or more elements or other _____ joined together in a fixed composition

Answer 5

compound

Question 6

the substances in a ______ mixture are evenly distributed throughout the mixture

Answer 6

homogenous

Question 7

in an ______ mixture, the parts of the mixture are noticeably different from one another

Answer 7

heterogeneous

Question 8

fresh milk is a suspension, but homogenized ilk is a _________

Answer 8

colloid

Question 9

if the particles in a mixture scatter light, the mixture is either a _____ or a _____

Answer 9

suspension, colloid

Question 10

based on the information in figure 2-1, the ___ point of gold is 1064.2 degrees C and the _____ point of gold is 2856.0 degrees C

Answer 10

melting, boiling

Question 11

measuring _______ can be used to test the purity of some substances

Answer 11

density

Question 12

if a spoon gets hot too quickly, when it is used to stir a pot of soup its probably made of _______

Answer 12

metal

Question 13

a material used for electrical wiring would need to have good _______

Answer 13

conductivity

Question 14

_______is a process that could be used to separate dissolved particles from the liquid in a solution

Answer 14

distillation

Question 15

a _______ change occurs when a material changes shape or size but the composition of the material does not change

Answer 15

physical

Question 16

_______ properties can be observed only when the substances in a sample of matter are changing into different substances

Answer 16

chemical

Question 17

rust forms because iron and oxygen are highly _______ elements

Answer 17

reactive

Question 18

a solid that forms and separates from a liquid mixture is a _______

Answer 18

precipitates

Question 19

a cake rises as it bakes because a chemical change causes _______ to be produced

Answer 19

gas

Question 20

when a metal changes color it has been heated, a _______ change occurred. when a metal changes color because it has reacted with another substance, a _______

Answer 20

physical, chemical

Question 21

a _______ has a definite volume and a definite shape

Answer 21

solid

Question 22

the state of matter that exists only at extremely low temperatures is called a bose-einstein _______

Answer 22

condensate

Question 23

materials can be classified as solids, liquids, or gases based on whether their shapes and _______ are definite or variable

Answer 23

volumes

Question 24

a material with a shape that remains unchanged when it is moved from on container to another is a _______

Answer 24

solid

Question 25

the _______ theory of matter states that all particles of matter are in constant motion

Answer 25

kinetic

Question 26

the motion of one particle of a gas is unaffected by the motion of other particles of the gas unless the particles _______

Answer 26

collide

Question 27

_______ between the particles of a gas and the walls of the container cause pressure in a closed container of gas

Answer 27

collions

Question 28

the pascal is the SI unit for _______

Answer 28

pressure

Question 29

reducing the volume of gas _______ its pressure if the _______ of the gas and the number of particles are constant

Answer 29

increases , temperature

Question 30

a graph representing Charles law shows that the _______ of a gas increases at the same rate as the _______ of the gas

Answer 30

temperature, volume

Question 31

the combined gas law describes the relationship among the _______, _______, and _______ of a gas when the number of particles is constant

Answer 31

pressure, volume, temperature

Question 32

if you're using charles law to find volume of a gas at a certain temperature, the temperature must be expressed in _______

Answer 32

kelvin

Question 33

if you know the volume and pressure of a gas and the pressure changes, you can find the new pressure by multiplying P1 by V1 and _______ this number by V2

Answer 33

dividing

Question 34

the phase change that is the reverse of deposition is _______

Answer 34

sublimation

Question 35

at sea level, water _______ at 100 degrees C

Answer 35

boils

Question 36

when water boils, some of its molecules have enough _______ _______ to overcome the attraction of neighboring molecules

Answer 36

kinetic energy

Question 37

during vaporization, a substance changes from a _______ to a _______

Answer 37

liquid, gas

Question 38

evaporation is the process that changes a substance from a liquid to a gas at temperatures below the substances _______ point

Answer 38

boiling

Question 39

during a _______ change, a system absorbs energy from its surroundings

Answer 39

endothermic