Unit A: Section 3.0

Question 1

What are the elements on the left side of the equation called?

Answer 1

Reactants

Question 2

What are the elements on the right side of an equation called?

Answer 2

Products

Question 3

What are indications of chemical reactions?

Answer 3

• Formation of gas
• Formation of solids
• Energy Changes
• Change in odour

Question 4

How does an explosion occur?

Answer 4

When a small amount of a solid or liquid converts quickly to a large volume of gas

Question 5

What is the chemical formula for methane?

Answer 5

CH4

Question 6

What is an example of a commercial use for an explosion?

Answer 6

Airbags

Question 7

What is five-minute epoxy?

Answer 7

A product that contains 2 chemicals that when mixed hardens in 5 minutes

Question 8

How does 5 minute epoxy work?

Answer 8

The molecules have several places where they can join causing it to form one large molecule

Question 9

What state are metal elements always in?

Answer 9

Solid

Question 10

What state are all the diatomic elements?

Answer 10

Gas

Question 11

What are diatomic elements?

Answer 11

Elements that come in pairs or more such as O2

Question 12

What state does bromine come in?

Answer 12

Liquid

Question 13

What state does Iodine come in?

Answer 13

Solid

Question 14

What do letters in subscript indicate?

Answer 14

The state of an element

Question 15

What does a subscript of (aq) mean?

Answer 15

It is dissolved in water

Question 16

What state are all ionic compounds?

Answer 16

Solid

Question 17

When is an ionic compound shown in aqueous?

Answer 17

When it is very soluble and dissolved in water

Question 18

When is an ionic compound shown as solid?

Answer 18

When it is only slightly soluble even if its dissolved in water

Question 19

How do you predict the state of molecular compounds?

Answer 19

The smaller the molecules means most likely gas. The bigger the molecules most likely solid

Question 20

What are exothermic reactions?

Answer 20

When chemical reactions releases energy in the form of heat, light, or electricity

Question 21

How do car batteries work?

Answer 21

They contain sulfuric acid which is an electrolyte with reacts with lead and lead oxide to produce electricity

Question 22

What is a combustion reaction?

Answer 22

When oxygen reacts with a substance to form a new substance and gives off energy.

Question 23

How is electricity made using combustion?

Answer 23

Coal is burned and the steam used to burn the coal is able to turn a turbine

Question 24

What is a reactant in a combustion reaction?

Answer 24

Oxygen

Question 25

What are the products of a combustion reaction?

Answer 25

Carbon dioxide and energy and water vapor

Question 26

What are the fossil fuels?

Answer 26

Coal, Oil, and natural gas

Question 27

What is gasoline made out of?

Answer 27

Hexane C6H14

Question 28

What are endothermic reactions?

Answer 28

Reactions that absorb energy

Question 29

What are biochemical reactions essential to?

Answer 29

Life

Question 30

What are catalysts?

Answer 30

Chemicals that speed up a reaction but are not used up by it

Question 31

What are biochemical reactions?

Answer 31

Reactions that happen at an organism's body temperature and sped up by catalysts

Question 32

What type of reaction is synthesis?

Answer 32

Endothermic

Question 33

If energy is on the left side of chemical reaction is it endothermic or exothermic?

Answer 33

Endothermic

Question 34

If energy is on the right side of a reaction is it exothermic or endothermic?

Answer 34

Exothermic

Question 35

What type of reaction is cellular respiration?

Answer 35

Exothermic

Question 36

What are the characteristics of chemical reactions?

Answer 36

- Production of new substances - Flow of energy - Change of state - Consistent with the law of conservation of mass

Question 37

What comes along with a formation of a new substance?

Answer 37

New properties of state, melting point, color, density

Question 38

How can the flow of energy be detected?

Answer 38

-A change in temperature during the reaction

Question 39

What is the law of conservation of mass?

Answer 39

States that in a chemical reaction matter cannot be created or destroyed

Question 40

What does the arrow mean when writing a chemical formula?

Answer 40

Produces

Question 41

What is a formula equation?

Answer 41

Uses the chemical formulas of the reactants and products in a chemical reaction

Question 42

What is a skeletal equation?

Answer 42

A formula that shows the different elements but not in the correct proportions

Question 43

What are coefficients?

Answer 43

Numbers placed in front of elements or compounds to put in proper proportions

Question 44

What are the 5 common types of chemical reactions?

Answer 44

- Formation reactions - Decomposition reactions - Hydrocarbon combustions - Single replacement - Double replacement

Question 45

What is another name for a formation reaction?

Answer 45

Synthesis

Question 46

What takes place in a formation reaction?

Answer 46

2 elements combine to form a compound

Question 47

What is a decomposition reaction?

Answer 47

When a compound is broken down into its different parts. Only 1 reactant

Question 48

What are hydrocarbons?

Answer 48

Substances that contain hydrogen and carbon

Question 49

What is hydrocarbon combustion?

Answer 49

When hydrogen and carbon mix with oxygen and burn producing carbon dioxide and water vapor

Question 50

What is the chemical formula for natural gas?

Answer 50

NH4

Question 51

What is a single replacement reaction?

Answer 51

When a reactive element reacts with an ionic compound. After the reaction, the element ends up in a compound and an element ends up by itself

Question 52

What is a double replacement reaction?

Answer 52

When 2 ionic compounds switch elements

Question 53

What reactions only take place in solutions?

Answer 53

Double replacements

Question 54

What is the mole?

Answer 54

The quantity is the measure chemists use to measure elements

Question 55

What is the number of particles in one mole called?

Answer 55

Avogardo's number

Question 56

What element do chemists use to define the mole?

Answer 56

Carbon-12

Question 57

What number is avagardos number?

Answer 57

6.02 x 10^23

Question 58

What is the formula for finding the atomic molar mass?

Answer 58

m = n x M

Question 59

What does m mean when finding the atomic molar mass?

Answer 59

The mass in grams

Question 60

What does n mean when finding the atomic molar mass?

Answer 60

The number moles

Question 61

What does M mean when finding the atomic molar mass?

Answer 61

The molar mass