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Chapter 19 - Chemical Reactions

Total questions: 21

Worksheet time: 25mins

Name
Class
Date
1.

What is the definition of a chemical formula?

a)
A chemical formula is a concise way of expressing information about the atoms that constitute a particular chemical compound.
b)
A chemical formula is a type of mathematical equation used in chemistry
c)
A chemical formula is a list of ingredients used in a chemical reaction
d)
A chemical formula is a diagram showing the structure of a molecule
2.

What is the definition of a catalyst?

a)
A substance that decreases the rate of a chemical reaction without being consumed
b)
A substance that has no effect on the rate of a chemical reaction
c)
A substance that is completely consumed in a chemical reaction
d)
A substance that increases the rate of a chemical reaction without being consumed in the process.
3.

What is the definition of a synthesis reaction?

a)

The combination two or more simple substances to form a more complex product

b)
Combining two or more complex substances to form a simpler product
c)
Breaking down a complex substance into simpler products
4.

What is a exothermic reaction?

a)
A chemical reaction that releases energy in the form of heat or light.
b)
A reaction that absorbs energy in the form of heat or light.
c)
A reaction that only releases energy in the form of sound.
5.

Write the four main types of chemical reaction? (no combustion)

4 lines
6.

What is the definition of aqueous?

a)

A solution in which the solvent is a gas

b)

A solution in which the solvent is a solid

c)

A solution in which the solvent is a liquid

7.

What is the definition of a decomposition reaction?

a)
A reaction in which a compound remains unchanged
b)

A type of chemical reaction in which a compound breaks down into two or more simpler substances

c)
A reaction in which two or more substances combine to form a new compound
8.

What is a combustion reaction?

4 lines
9.

What is the definiton of a chemical reaction?

a)
A process in which one or more substances are converted into one or more different substances
b)

A process in which light and heat are always produced

c)

A process in which only solids and gases are involved

10.

What is the definition of a inhibitor?

a)
A substance that speeds up a particular chemical reaction or other process.
b)
A substance that has no effect on any chemical reaction or process.
c)
A substance that slows down or prevents a particular chemical reaction or other process.
d)

A substance that only affects the processes, not chemical reactions.

11.

What is the definiton of a coefficient?

a)

A number that goes at the end of a chemical equation of symbol

b)

A number that goes above a chemical symbol

c)

A number that goes before a chemical equation in order to balance the products and reactants sides.

12.

What is the definition of a subscript?

a)

A number that is below a chemical symbol showing how many of that element there are.

b)
A subscript is a character that is set at the normal line of type
c)
A superscript is a character that is set slightly above the normal line of type
13.

Explain the Law of Conservation of Mass

4 lines
14.

Balance the equation.

Fe + H2O → Fe3O4 + H2

15.

What is the definition of an endothermic reaction?

a)
Absorbs heat from its surroundings
b)
Does not involve any heat exchange
c)
Causes a decrease in temperature
d)
Releases heat to its surroundings
16.

What is the definition of a chemical equation?

a)
A mathematical equation involving chemical elements
b)
A written description of a chemical process
c)
A diagram showing the structure of a chemical compound
d)
A symbolic representation of a chemical reaction
17.

What is the definition of products in a chemical reaction?

a)
Substances formed as a result of the reaction
b)
The starting materials for the reaction
c)

The number before a chemical symbol to show how many atoms there are

18.

What is the difference endothermic and exothermic reactions?

4 lines
19.

What is the definition of a single displacement reaction?

a)
A single displacement reaction is a chemical reaction in which one element replaces another element in a compound.
b)
A single displacement reaction is a reaction where a compound breaks down into its constituent elements.
c)
A single displacement reaction is a reaction where two elements combine to form a compound.
d)
A single displacement reaction is a reaction involving two compounds exchanging ions.
20.

What is the definition of a double displacement reaction?

a)
A reaction in which there is no exchange of ions between compounds
b)
A reaction in which two compounds combine to form a single compound
c)
A chemical reaction in which two compounds exchange ions to form two new compounds.
d)
A reaction in which a single compound breaks down into two or more simpler substances
21.

Name the parts of a chemical equation?

4 lines

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