history 2.3 self test 2023

Question 1

true or false
John dalton contributed to the atomic theory

Answer 1

true

Question 2

true or false
density is an example of a general property of matter

Answer 2

false

Question 3

true or false
a gas has a definite volume but no definite shape

Answer 3

false

Question 4

true or false
milk is an example of matter

Answer 4

true

Question 5

true or false
water boils at 100 degrees on the celsius scale

Answer 5

true

Question 6

true or false
the meniscus should be read at the top sides of the curve

Answer 6

false

Question 7

true or false
a snowflake is a crystalline solid

Answer 7

true

Question 8

true or false
Neils Bohr drew the first picture of an atom

Answer 8

true

Question 9

true or false
Most atoms have a positive charge

Answer 9

false

Question 10

true or false
a molecule is made up of two or more atoms

Answer 10

true

Question 11

an atoms ability to combine is indicated by its __________

Answer 11

valence

Question 12

atomic particles that orbit the nucleus are the _________

Answer 12

electrons

Question 13

the inner energy level is designated by the number

Answer 13

1

Question 14

density equals mass divided by ___________

Answer 14

volume

Question 15

Ca is the ___________ for calcium

Answer 15

symbol

Question 16

electrons have a ___________ charge

Answer 16

negative

Question 17

the 1st energy level can hold a maximum of _______ electrons

Answer 17

2

Question 18

the building blocks of the universe are called

Answer 18

elements or atoms

Question 19

the atomic number tells how many ______ are in the nucleus

Answer 19

protons

Question 20

in the atom, nearly all the mass is found in the ________

Answer 20

nucleus

Question 21

Describe the characteristics of solids

Answer 21

has mass, takes up space, fixed shape and volume, may be crystalline

Question 22

Describe the characteristics of liquids

Answer 22

has mass, takes up space, fixed volume, no fixed shape

Question 23

describe the characteristics of gases

Answer 23

has mass, takes up space, no fixed volume, no fixed shape

Question 24

Define: compoud

Answer 24

a chemically combined substance made up of two or more different elements

Question 25

Define: element

Answer 25

substances that have only one kind of atom

Question 26

Define: mixture

Answer 26

a reversible combination of two or more substances not in fixed proportions

Question 27

List 2 general physical properties of matter
1
2

Answer 27

1. has mass
2. takes up space

Question 28

List 3 special physical properties of matter
1
2
3

Answer 28

1. density
2. Buoyancy
3. freezing point

Question 29

Gold

Answer 29

Au

Question 30

Neutron

Answer 30

no electrical charge

Question 31

Proton

Answer 31

Positive charge

Question 32

salt water

Answer 32

a liquid solution

Question 33

alloy

Answer 33

solid solution