Types of Chemical Reactions

Question 1

What are examples of chemical changes?

Answer 1

-When wood in a campfire burns.
-When photosynthesis, which is when plants change water and carbon dioxide into glucose and oxygen, occurs.

Question 2

What is made in each of these processes?

Answer 2

New substances

Question 3

True or False: It is not always easy to tell if a new substance forms during a change.

Answer 3

True

Question 4

True or False: There are some clues that you can use to tell if a chemical change has occurred.

Answer 4

True

Question 5

Precipitate Definition

Answer 5

An insoluble solid formed in a chemical reaction.

Question 6

What are the six clues that suggest a chemical change is occurring?

Answer 6

-Formation of a gas
-Formation of a precipitate
-Change in colour
-Change in odour
-Change in temperature
-Production of light

Question 7

True or False: The new substances, or products, that form during chemical changes will depend on the type of chemical reaction occurring.

Answer 7

True

Question 8

What does understanding the different types of chemical reactions allow you to do?

Answer 8

To identify what products are most likely to form.

Question 9

What are four different types of chemical reactions?

Answer 9

Synthesis, Decomposition, Single Displacement, and Double Displacement.

Question 10

What does the name of each reaction provide a clue about?

Answer 10

How the reactants change into products.

Question 11

What is the chemical reaction in which two or more reactants combine to form a new product?

Answer 11

Synthesis Reaction

Question 12

Synthesis Reaction Definition

Answer 12

A chemical reaction in which two or more reactants combine to produce a new product.

Question 13

What is the general equation in which synthesis reactions can be represented by?

Answer 13

A + B (arrow) AB

Question 14

Explain what the general equation that synthesis reactions can be represented by means

Answer 14

Two or more reactants (A and B) combine to form one product (AB).

Question 15

True or False: The reactants in a synthesis reaction may be any combination of elements and compounds, but the product will always be a compound.

Answer 15

True

Question 16

What is the chemical reaction in which a compound breaks down into two or more products?

Answer 16

Decomposition Reaction

Question 17

Decomposition Reaction Definition

Answer 17

A chemical reaction in which a compound breaks down (decomposes) into two or more simpler compounds or elements.

Question 18

What is the general chemical equation in which decomposition reactions can be represented by?

Answer 18

AB (arrow) A + B

Question 19

What might the products in a decomposition reaction be any combination of?

Answer 19

Elements and Compounds

Question 20

True or False: The reactant in a decomposition reaction will always be a compound.

Answer 20

True

Question 21

True or False: A decomposition reaction is the reverse of a synthesis reaction.

Answer 21

True

Question 22

What is the chemical reaction in which a reactive element (a metal or a non-metal) and a compound react to produce another element and another compound?

Answer 22

A Single Displacement Reaction

Question 23

Single Displacement Reaction Definition

Answer 23

A chemical reaction in which one element takes the place of another element in a compound.

Question 24

Therefore, a single displacement reaction is a chemical reaction in which:

Answer 24

An element takes the place of, or displaces, another element in a compound.

Question 25

What are the two general chemical equations that single displacement reactions can be represented by?

Answer 25

-A + BC (arrow) AC + B (for single displacement, where A is a metal). -A + BC (arrow) BA + C (for single displacement, where A is a non-metal).

Question 26

What do the two general chemical equations that single displacement reactions can be represented by mean?

Answer 26

-The first equation represents a reaction involving a metal replacing another metal. -The second equation represents a reaction involving a non-metal replacing another non-metal.

Question 27

In a Single Displacement Reaction, why do metals displace other metals?

Answer 27

Because a metal forms positive ions, and therefore, it must displace the positive ion from the compound so that a new ionic compound can form.

Question 28

What is the list of elements organized according to their chemical reactivity called?

Answer 28

An Activity Series

Question 29

Activity Series Definition

Answer 29

A list of elements organized according to their chemical reactivity; the most reactive element appears at the topic and the least reactive element appears at the bottom.

Question 30

True or False: The most reactive element is at the top of the list, and the least reactive element is at the bottom.

Answer 30

True

Question 31

A reactive metal will displace or replace a metal in a compound that is __________ it in the activity series.

Answer 31

Below

Question 32

What is one element on the activity series of metals that is not a metal?

Answer 32

Hydrogen

Question 33

Why can metals take the place of hydrogen in compounds?

Answer 33

Because hydrogen ions can be positively charged.

Question 34

True or False: The ion of a non-metal is negatively charged, so it can only be replaced with another non-metal.

Answer 34

True

Question 35

What is the chemical reaction called in which the positive ions of two compounds change places and form two new compounds?

Answer 35

Double Displacement Reaction

Question 36

Double Displacement Reaction Definition

Answer 36

A chemical reaction in which the positive ions of two different compounds exchange places, resulting in the formation of two new compounds-one of which may be a precipitate.

Question 37

What are usually the reactants of a double displacement reaction?

Answer 37

Aqueous solutions of ionic compounds.

Question 38

What is the general chemical equation that double displacement reactions can be represented by?

Answer 38

AB + CD (arrow) AD + CB

Question 39

What are the characteristics of a Synthesis Reaction?

Answer 39

Two reactants join to form a single compound.

Question 40

What are the characteristics of a Decomposition Reaction?

Answer 40

A single compound breaks apart into two or more products?

Question 41

What are the characteristics of a Single Displacement Reaction?

Answer 41

A reactive element takes the place of a less reactive element in a compound.

Question 42

What are the characteristics of a Double Displacement Reaction?

Answer 42

Two ionic compounds in a solution switch ions and form two new compounds, including a precipitate.

Question 43

Worksheets under Submission Tab Called "Chemistry Test Review"; Textbook Questions on Page 189 (1-2, 5-8), on Page 193 (1-2) and on Page 196 (1-2)

Answer 43

Depending on comfort level.