module 1: what's matter?

Question 1

what is chemistry?

Answer 1

the study of composition, structure, properties, and reactions of matter

Question 2

what are chemicals?

Answer 2

substances that have the same composition and properties wherever found

Question 3

what is matter?

Answer 3

anything that takes up space

Question 4

Is there new matter?

Answer 4

NO

Question 5

what is the law of conservation of mass?

Answer 5

“Matter is neither created nor destroyed in a chemical reaction.”

mass of reactants = mass of products
- must be balanced

Question 6

what is a pure substance?

Answer 6

pure substances have a fixed or definite compositon
- composition CANNOT be changed
- can be either an element or a compound

Question 7

what is a mixture?

Answer 7

mixtures contain two or more different substances that are physically mixed but not chemically combined
- composition can change
- can be either a homogeneous mixture or a heterogeneous mixture

Question 8

can composition change for pure substances?

Answer 8

NOOOOOOOOOO

Question 9

can composition change for a mixture?

Answer 9

yes

Question 10

how many types of atoms are in a pure substance?

Answer 10

only one type of atom or molecule

Question 11

elements contain only _____ type of atom, and cannot be separated into simpler substances

Answer 11

one

Question 12

compounds contain ______ or ____ elements combined in ______

Answer 12

compounds only contain TWO or MORE elements combined in CONSTANT PROPORTIONS

Question 13

can compounds be broken down into the elements it’s made from using chemical seperation methods?

Answer 13

YES

Question 14

are atoms stable?

Answer 14

yes

Question 15

is an element a pure substance?

Answer 15

yes
- only composed of only one type of atom

Question 16

can a compound be a pure substance?

Answer 16

yes, as long as it’s composed of two or more elements that are combined in the same proportion

Question 17

what are the two “legs” of a pure substance?

Answer 17

elements AND compounds

Question 18

What is this?
a ____ consists of two or more substances that are physically mixed, but cannot be combined.

Answer 18

mixture

Question 19

are mixtures chemically combined?

Answer 19

NOOOOOO

Question 20

what are the two “legs” of mixtures?

Answer 20

homogenous AND heterogenous

Question 21

what is a homogenous mixture?

Answer 21

has the same composition throughout

Question 22

what is a heterogenous mixture?

Answer 22

its composition differs in different parts of the sample
- not the same throughout

Question 23

in which mixture are different parts of the mixture visible?
heterogenous or homogenous mixture?

Answer 23

heterogenous mixture

Question 24

matter is split up into which “legs”?

Answer 24

pure substances and mixtures

Question 25

classify the following: a.) carbon dioxide (CO2) b.) nitrogen (N2) c.) soda d.) rust (iron (III) oxide Fe2O3) e.) sea water f.) coffee g.) oil and water h.) chicken noodle soup

Answer 25

a.) compound b.) element c.) mixture d.) compound e.) heterogenous mixture f.) homogenous mixture g.) heterogeneous mixture h.) heterogenous mixture

Question 26

how fast do solids particles move?

Answer 26

very slowly

Question 27

which state of matter is this? ____ have an indefinite shape but a definite volume

Answer 27

waterh

Question 28

how fast do water particles move?

Answer 28

slowly

Question 29

do gases have an indefinite shape AND indefinite volume?

Answer 29

yes

Question 30

does gas take up the shape and volume of its container?

Answer 30

yes

Question 31

____ has a definite volume but takes the shape of the container

Answer 31

liquid

Question 32

____ particles are moving rapidly

Answer 32

gas

Question 33

___ particles fill the entire volume of a container

Answer 33

gas

Question 34

____ have a fixed arrangement

Answer 34

solid

Question 35

____ particles are close together but moving randomly

Answer 35

liquid

Question 36

what are physical properties?

Answer 36

characteristics observed or measured without changing the identity of a substance - This includes: the shape, physical state, boiling and freezing points, density, and the color

Question 37

what is physical change?

Answer 37

physical change occurs when matter undergoes a physical change of state, but its composition stays the SAME

Question 38

does water undergo physical change?

Answer 38

yes, it can be ice, water, or steam and it still has the same composition

Question 39

what is the boiling point of water?

Answer 39

100 celcius

Question 40

true or false: in physical changes the identity og the substance remains the same

Answer 40

true!!!

Question 41

what is a chemical property?

Answer 41

a chemical property describes the ability of a substance - things about them - how it will react - if we mix __ with __, how will it react? - ex. iron rusting

Question 42

is it a physical property or a chemical property? a ______ property is one that a substance displays without changing its composition

Answer 42

physical property - doing the physical change - what about it?

Question 43

is it a physical property or a chemical property? a _____ property is one that a substance displays only through changing its composition

Answer 43

chemical property - does the mixing - how will it change?

Question 44

during a chemical change, is a new substance formed?

Answer 44

yes

Question 45

true or false: matter undergoes a chemical change when it undergoes a chemical reaction

Answer 45

true

Question 46

is it a physical or chemical change? water boiling to give water vapor

Answer 46

physical change

Question 47

is it a physical or chemical change? baking soda combining with vinegar to produce gas bubbles

Answer 47

chemical change

Question 48

is it a physical or chemical property or change? casting a copper pot from molten copper

Answer 48

physical change

Question 49

is it a physical or chemical property or change? the temperature of orange juice in the refrigerator is 5 degrees celcius

Answer 49

physical property

Question 50

is it a physical or chemical property or change? copper statues have a tendency to develop a layer of patina after being exposed to the environment for a while

Answer 50

chemical property

Question 51

is it a physical or chemical property or change? the density of gold is 19.2 g/ cm3

Answer 51

physical property

Question 52

is it a physical or chemical property or change? iodine is a solid at room temperature

Answer 52

physical property

Question 53

is it a physical or chemical property or change? sugar decomposed to form carbon and water around 170 degrees Celsius

Answer 53

chemical property