Unit 2 Review

Front 1

States that mass is neither created nor destroyed but is conserved during a chemical reaction.


Single

Back 1

Law of Conservation of Mass

Front 2

The table organizing the elements, contains periods and groups


Single

Back 2

The Periodic Table

Front 3

The ratio of the mass of each element to the total mass of a compound

(Insert formula)

Single

Back 3

Percent by Mass

Front 4

The technique that uses evaporation or boiling point of a liquid in a solution to separate a dissolved solid from the solution.
Used in making rock candy.

Single

Back 4

Crystallization

Front 5

State of matter with an indefinite shape and indefinite volume


Single

Back 5

Gas

Front 6

State of matter with an indefinite shape but a definite volume


Single

Back 6

Liquid

Front 7

State of matter with a definite shape and a definite volume


Single

Back 7

Solid

Front 8

Atoms of an element have the same number of protons. But if they have a different number of neutrons they are called ____________________.


Single

Back 8

Isotopes

Front 9

The smallest building block of matter or smallest particle of an element that retains the properties of that element is known as _________________________.


Single

Back 9

An atom

Front 10

The weighted average mass of an elements isotopes is called _________________________.


Single

Back 10

The Average Atomic Mass

Front 11

The center most part of an atom where the protons and neutrons are found...


Single

Back 11

The nucleus

Front 12

The atomic number of an atom tells us ...
(there are two answers)



Double

Back 12

The number of protons and the number of electrons in the atom

Front 13

The mass number of an atom tells us...



Double

Back 13

The number of protons and the number of neutrons in the atom

Front 14

Identify the property as either physical or chemical:

Color


Single

Back 14

Physical

Front 15

Identify the property as either physical or chemical:

Tendency of rust

Single

Back 15

Chemical

Front 16

Identify the property as either physical or chemical:

Boiling Point


Single

Back 16

Physical

Front 17

Identify the property as either physical or chemical:

Density

Single

Back 17

Physical

Front 18

Identify the property as either physical or chemical:

Mass

Single

Back 18

Physical

Front 19

Identify the property as either physical or chemical:

Ability to burn


Single

Back 19

Chemical

Front 20

Identify the property as either physical or chemical:

Malleability


Single

Back 20

Physical

Front 21

Identify the change as either physical or chemical:

breaking a pencil in half

Single

Back 21

Physical

Front 22

Identify the change as either physical or chemical:

Wood Burning

Single

Back 22

Chemical

Front 23

Identify the change as either physical or chemical:

Silver tarnishing


Single

Back 23

Chemical

Front 24

Identify the change as either physical or chemical:

Ice Melting


Single

Back 24

Physical

Front 25

Identify the change as either physical or chemical:

Hard-boiling an egg

Single

Back 25

Chemical

Front 26

Identify the change as either physical or chemical:

Grinding coffee beans


Single

Back 26

Physical

Front 27

Identify the change as either physical or chemical:

Burning Gasoline

Single

Back 27

Chemical

Front 28

Identify each mixture as either homogeneous or heterogeneous:

Air

Single

Back 28

Homogeneous

Front 29

Identify each mixture as either homogeneous or heterogeneous:

Oil and Water

Single

Back 29

Heterogeneous

Front 30

Identify each mixture as either homogeneous or heterogeneous:

Chunky peanut butter

Single

Back 30

Heterogeneous

Front 31

Identify each mixture as either homogeneous or heterogeneous:

Gasoline

Single

Back 31

Homogeneous

Front 32

Used the periodic table to identify the following element:

Atomic number 68

Single

Back 32

Terbium

Front 33

Used the periodic table to identify the following element:

78 protons

Single

Back 33

Platinum

Front 34

Used the periodic table to identify the following element:

44 electrons and 44 protons

Single

Back 34

Ruthenium

Front 35

Used the periodic table to identify the following element:

Mass number 45 and number of neutrons 24

Double

Back 35

Scandium

Front 36

True or False:

Neutrons have no charge

Single

Back 36

True

Front 37

A 24 g sample of carbon combines with 64 g of oxygen to form CO2.
a) What is the mass of the reactants?
b) What is the mass of the product?
c) What law does this support?

Triple

Back 37

a) 24 + 66 = 88g
b) 88g because mass of reactants = mass of products
c) Law of Conservation of Mass

Front 38

A 58.33 g sample of Mg(OH)2, always contains 24.31 g of magnesium, 32.00g of oxygen, and 2.02 g of hydrogen. Find the mass percentage of each element in the compound.

Home Run

Back 38

Mg: (24.31/58.33) x 100 = 41.7%

O: (32.00/58.33) x 100 = 54.9%

H: (2.02/58.33) x 100 = 3.5%

Front 39

Calculate the average atomic mass of gallium with the following isotopes:
Ga-69 abundance of 60.12% and a mass of 68.9257
Ga-71 abundance of 39.88% and a mass of 70.9249

Home Run

Back 39

Ga-69: (68.9257 x 0.6012) = 41.44
Ga-71: (70.9249 x 0.3988) = 28.28

41.44 + 28.28 = 69.72

Front 40

For a new element the average atomic mass is found to be 52.0 amu. The following is a list of the isotopes found and their masses.
Isotope 1 mass 49.946
Isotope 2 mass 51.941
Isotope 3 mass 52.991
Isotope 4 mass 53.939

Which isotope has the highest abundance? Why?

Triple

Back 40

Isotope 2 will have the highest abundance and occurs the most often because the average atomic mass is closest to the mass of this isotope.

Front 41

Identify the following as an atom, ion, or isotope:

Chlorine- 37


Single

Back 41

Isotope

Front 42

Identify the following as an atom, ion, or isotope:

Sulfer

Single

Back 42

atom

Front 43

Identify the following as an atom, ion, or isotope:


Magnesium +2

Single

Back 43

ion

Front 44

True or False:
The mass of a neutron is approximately equal to the mass of a proton.


Single

Back 44

True

Front 45

True or False:
A solid cannot be compressed because its particles are tightly packed.


Single

Back 45

True

Front 46

True or False:
An intensive physical property is one that depends on the amount of matter present. For example mass or volume.

Single

Back 46

False, extensive physical properties are dependent on the amount . intensive are independent.

Front 47

True or False:
Matter that has a uniform and unchanging composition is called a pure substance.

Single

Back 47

True

Front 48

Define exothermic and endothermic.


Triple

Back 48

exothermic: heat is produced and leaves the reaction, feels warm or hot.

endothermic: heat is absorbed and used during the reaction, feels cool or cold

Front 49

What are the five indication of a chemical reaction taking place? (you need to list all five)


Home Run

Back 49

1. creation of a gas
2. creation of a precipitate
3. heat or light given off
4. a color change
5. a change in odor

Front 50

What is a precipitate?



Single

Back 50

When two solutions are mixed together and a solid is formed from a chemical reaction.

Front 51

Identify the reactant(s) in the following equation:

2 H2O ---> 2 H2 + O2

Double

Back 51

H2O

Front 52

Identify the product(s) in the following equation:

2 H2O ---> 2 H2 + O2

Double

Back 52

H2 and O2

Front 53

On the board, draw the particles of a liquid in a container.


Double

Back 53

See image

Front 54

On the board, draw the particles of a solid in a container.


Double

Back 54

See image

Front 55

On the board, draw the particles of a gas in a container.


Double

Back 55

See image