Unit 1 Test

Question 1

type of heterogeneous mixture that seems homogeneous bc it’s stirred up due to wind or a current

Answer 1

suspension

Question 2

type of heterogeneous mixture with two solids

Answer 2

mechanical

Question 3

same throughout; all samples have the same chemical and physical properties

Answer 3

homogeneous

Question 4

samples have different properties; substances will settle out

Answer 4

heterogeneous

Question 5

change in location, mixture, or state

Answer 5

physical change

Question 6

change in identity of substance

Answer 6

chemical change

Question 7

change in nucleus of atoms

Answer 7

nuclear

Question 8

solid to gas

Answer 8

sublimation

Question 9

solid to liquid

Answer 9

melting

Question 10

liquid to gas

Answer 10

boiling

Question 11

gas to solid

Answer 11

deposition

Question 12

gas to liquid

Answer 12

condensation

Question 13

liquid to solid

Answer 13

freezing

Question 14

3 things that sublime

Answer 14

dry ice
iodine
moth balls(paradichlorobenzene)

Question 15

energy in

Answer 15

endothermic

Question 16

examples of endothermic

Answer 16

melting, boiling, sublimation

Question 17

energy out

Answer 17

exothermic

Question 18

examples of exothermic

Answer 18

condensation, freezing, deposition

Question 19

solubility is a property of what type of change

Answer 19

physical change

Question 20

substances that dissolve in water

Answer 20

sugar, baking soda, salt

Question 21

substances that dissolve in oily solvents like toluene, gasoline, turpentine, or carbon tetrachloride

Answer 21

tar, asphalt, waxes, oils, fats, dirt, iodine, plastic

Question 22

all nitrates will dissolve in what?

Answer 22

water

Question 23

most ionic compounds…?

Answer 23

dissolve

Question 24

all chlorides are soluble except…?

Answer 24

silver chloride and lead chloride

Question 25

things that won't dissolve in either water or gas

Answer 25

metal, charcoal, wood, calcium carbonate(shells, limestone, chalk, and marble)

Question 26

what are some examples of calcium carbonate

Answer 26

shells, limestone, chalk, and marble

Question 27

separations are what type of change

Answer 27

physical change

Question 28

what processes can separate non volatile substances from water

Answer 28

evaporation and boiling

Question 29

what can separate two volatile substances

Answer 29

distillation

Question 30

something that will evaporate easily

Answer 30

volatile substance

Question 31

4 signs of chemical change

Answer 31

change in color change in odor formation of precipitate formation of gas

Question 32

example of formation of precipitate

Answer 32

sodium chloride mixed with silver nitrate to create silver chloride

Question 33

what is a precipitate

Answer 33

a solid that forms and settles out of a liquid mixture

Question 34

example of a change in color

Answer 34

copper in nitric acid turns green

Question 35

example of a change in odor

Answer 35

cooking or rotting

Question 36

example of a formation of a gas

Answer 36

hydrochloric acid + magnesium = hydrogen and magnesium chloride

Question 37

a self correcting process humans use to study, explain and document natural phenomena, which can be developed into technology

Answer 37

scientific method

Question 38

an explanation of a group of observations and experimental data; it may change over time

Answer 38

theory

Question 39

a mathematical statement of fact based upon experimental results; doesn't change over time

Answer 39

scientific law

Question 40

phlogiston model

Answer 40

- things that can't burn have none - things that can burn do have it - it should weigh less after burning

Question 41

common example that supports the phlogiston model

Answer 41

burning paper/ wood in an open container

Question 42

fuel= ash + phlogiston

Answer 42

phlogiston model

Question 43

fuel + oxygen = oxides

Answer 43

modern combustion theory

Question 44

weighs more after burning due to addition of oxygen

Answer 44

modern combustion theory

Question 45

what the scientist adjust from trial to trial

Answer 45

independent variable

Question 46

what the scientist measures (the effect)

Answer 46

dependent variable

Question 47

any physical change or chemical reaction, mass is conserved

Answer 47

law of conservation of mass

Question 48

is the formation of dew on grass in the morning chemical or physical?

Answer 48

physical bc it can be undone by evaporation

Question 49

what type of process is condensation?

Answer 49

exothermic

Question 50

what type of property is color

Answer 50

physical

Question 51

name an element

Answer 51

gold silver iron potassium

Question 52

what is the classification of gold

Answer 52

homogeneous pure substance

Question 53

name a compound

Answer 53

Carbon dioxide water salt

Question 54

name a homogeneous mixture

Answer 54

salt water, air

Question 55

name a heterogeneous mixture

Answer 55

muddy river water, orange juice w pulp

Question 56

what reactant is always needed for combustion

Answer 56

oxygen

Question 57

what product is always formed in combustion

Answer 57

oxides

Question 58

difference between an element and a compound

Answer 58

elements cannot be broken down, but compounds can be broken down by chemical means

Question 59

similarity between an element and a compound

Answer 59

both are homogeneous and pure substances

Question 60

what can mixtures be broken down by

Answer 60

physical means

Question 61

what can compounds be broken down by

Answer 61

chemical means

Question 62

classification of oxygen

Answer 62

homogeneous element/ compound

Question 63

classification of air

Answer 63

homogeneous mixture

Question 64

big molecules that can be either homogenous of heterogeneous

Answer 64

colloid