jun 11 unit test

Question 1

solid -> gas

Answer 1

sublimation

Question 2

gas-> solid

Answer 2

deposition

Question 3

define matter

Answer 3

everything

Question 4

define pure substances

Answer 4

one type of particle

Question 5

define mixtures

Answer 5

two or more particles that make up something

Question 6

define elements

Answer 6

cannot be broken down into smaller substances

Question 7

define compounds

Answer 7

different elements combined in fixed proportions

Question 8

define homogenious

Answer 8

it looks like one thing. eg.) apple juice,

Question 9

define heterogeneous

Answer 9

you can see different things. eg.) a bowl of fruit

Question 10

name some physical properties

Answer 10

states of matter ( gaseous, solid and liquid)
color.
smell.
freezing point.
boiling point.
melting point.
Magnetism

Question 11

name some chemical properties

Answer 11

flammability, toxicity, acidity, reactivity

Question 12

define chemical change

Answer 12

A chemical change is a change of materials into another, new materials with different properties and one or more than one new substances are formed

Question 13

define physical change

Answer 13

Physical change is a type of change where the physical properties of matter change

Question 14

examples of physical change?

Answer 14

Crumpling a sheet of aluminum foil.
Melting an ice cube.
Casting silver in a mold.
Breaking a bottle.

Question 15

what happens when you change the number of neutrons

Answer 15

An isotope is formed

Question 16

what happens when you change the number of electrons

Answer 16

an ion is formed

Question 17

what happens when you change the number of protons

Answer 17

the element changes

Question 18

is the period the row or the column

Answer 18

row

Question 19

is the group the row or the column

Answer 19

column

Question 20

what are the properties of metals

Answer 20

-high melting and boiling point
-solid at room temp (mostly)
-shiny, malleable
-good at conducting

Question 21

what are the properties of metalloids

Answer 21

middle of non-metals and metals

Question 22

what are the properties of non-metals

Answer 22

• low melting and boiling point
• mostly gases and solids at room temp
• poor conductors
• dull and brittle

Question 23

what do groups tell you

Answer 23

the number of valence electrons

Question 24

what do periods tell you

Answer 24

the number of orbitals

Question 25

what are the properties of ionic compounds

Answer 25

soft
brittle
high melting and boiling point
most are soluble
conductive

Question 26

what are the properties of molecular compounds

Answer 26

soft solids
can also be liquids and gases
low melting and boiling points
insoluble
do not conduct

Question 27

what bond is formed by a molecular comound

Answer 27

covalent

Question 28

what bond is formed by an ionic compound

Answer 28

ionic

Question 29

define a covalent bond

Answer 29

sharing electrons

Question 30

define an ionic bond

Answer 30

giving away electrons