Chapter 3

Question 0

What is the study of matter and the changes it undergoes

Answer 0

Chemistry

Question 1

What is the part of the universe that has both mass and volume

Answer 1

Matter

Question 2

Materials that cannot be broken down by physical methods are called

Answer 2

Pure substances

Question 3

What are pure substances have

Answer 3

Constant composition

Question 4

What are the three things that you need to know about elements

Answer 4

Smallest unit atom
Found on the periodic table
Cannot be broken down

Question 5

What are the five things that u need to know about compounds

Answer 5

They are two or more different elements that are chemically bonded together
smallest unit molecule
can be broken down
governed by the law of constant composition
the process of being broken down is called decomposition

Question 6

what does the law of constant composition state

Answer 6

the law of constant composition states that elements combine in certain fixed whole number ratios in order to form compounds. the implication of this is if you change the ratio you change the compound.

Question 7

what is it called when elements combine to form a compound

Answer 7

synthesis

Question 8

what does decomposition need to occur

Answer 8

energy

Question 9

what are the types of energy

Answer 9

heat
electricity
pressure

Question 10

what are the three things that you need to know about mixtures

Answer 10

they are two or more pure substances physically bonded together
they have a variable composition
can be separated by physical methods

Question 11

what are the things that you need to know for a homogeneous mixture

Answer 11

same disposition
same
no layers
solution

Question 12

what are the things that you need to know for the heterogeneous mixture

Answer 12

layers
different disposition
different

Question 13

what are the two types of properties

Answer 13

physical and chemical properties

Question 14

what is the information that you need to know about the physical properties

Answer 14

the characteristics of matter that can be changed without changing its composition.
no new matter forms
the property describes when the changes will occur

Question 15

what are the things that you need to know about the chemical properties

Answer 15

the characteristics that determine how the composition of matter changes as a result of contact with other matter or the influence of energy
new matter forms

Question 16

what are the two types of changes that will be on the test

Answer 16

physical and chemical changes

Question 17

what are the things that you need to know about physical changes

Answer 17

the changes to matter that do not result in a change of the fundamental composition
state changes boiling melting condensing evaporate freezing sublime solubility

Question 18

what are the things that you need to know for chemical changes

Answer 18

involve a change in the fundamental composition
produce a new substance
chemical reaction
goes reactants to products

Question 19

for a physical change what is the most likely change

Answer 19

a change in state

Question 20

name the 7 common chemical changes

Answer 20

inert
rust 
tarnish 
cook
decompose
burn 
oxidize

Question 21

name the two kinds of forces and what they mean

Answer 21

intramolecular forces- means force within a molecule; the chemical bonds; effect chemical properties
intermolecular forces- means a force between molecules; effect physical properties

Question 22

what are the physical methods used for the separation of mixtures and the techniques

Answer 22

techniques physical property
filtration States of matter
evaporation volatility (how quickly liquid to gas)
decantation states of matter
chromatography polarity (stickiness/adherence to a surface
centrifugation density (homogeneous mixtures)
separatory funnel heterogeneous mixtures
extraction solubility
distillation boiling point