Quiz about Chemical Reactions

Question 1

A chemical reaction or process that absorbs heat from the surroundings and become cooler overall

Accepted Answer

Endothermic

Answer

Exothermic

Question 2

A chemical reaction or process that releases heat.

Accepted Answer

Exothermic

Answer

Endothermic

Question 3

When a new substance forms as a result of a chemical reaction, what type of change has occurred?

Accepted Answer

Chemical Change

Answer

Physical Change

Question 4

Which is NOT an indication of a chemical change?

Accepted Answer

Shape Change

Answer

Temperature Change

Answer

Formation of a precipitate

Answer

Production of light

Question 5

What is the left part of a chemical equation called?

2H_{2 +}O₂ --> 2H₂O

Accepted Answer

Reactants

Answer

Yields

Answer

Products

Answer

Chemical Equation

Question 6

What is the right part of a chemical equation called...

2H_{2 +}O₂ --> 2H₂O

Accepted Answer

Products

Answer

Reactants

Answer

Yields

Answer

Chemical Equation

Question 7

Which statement is not a description of a chemical reaction?

Accepted Answer

A liquid is heated in the sun and half of it evaporates.

Answer

A solid is dropped into a beaker of liquid and a gas is released.

Answer

A solid is dropped into a beaker of liquid and an explosion occurs.

Answer

Two liquids are mixed in a beaker and a solid forms at the bottom of the beaker.

Question 8

Which of the options below is NOT a chemical change

Accepted Answer

Phase Change

Answer

Cooking

Answer

Digestion

Answer

Rusting

Question 9

During a chemical reaction, atoms can

Accepted Answer

be rearranged to form a new substance

Answer

be destroyed to form a new substance

Answer

be created to form a new substance

Question 10

Burning paper is an example of a

Accepted Answer

chemical reaction

Answer

boiling point

Answer

extended structure

Question 11

Chemical and Physical changes are the same.

Accepted Answer

False

Answer

True

Question 12

Ice melting to liquid water is an example of what kind of change?

Accepted Answer

Physical

Answer

Chemical

Answer

Ionic

Answer

Polar

Question 13

Tearing a piece of paper in half is an example of what kind of change?

Accepted Answer

Physical

Answer

Chemical

Answer

Ionic

Answer

Polar

Question 14

A solid that forms when two liquids react chemically is known as a

Accepted Answer

Precipitate

Answer

Physical

Answer

Chunk

Answer

Floater

Question 15

One sign of a chemical reaction is energy change. When a reaction released energy as heat it is

Accepted Answer

Exothermic

Answer

Endothermic

Question 16

A reaction that can be summarized A + B $$\rightarrow$$ AB is

Accepted Answer

Synthesis

Answer

Decomposition

Answer

Displacement

Answer

Combustion

Question 17

A reaction that can be summarized as AB $$\rightarrow$$ A+B is

Accepted Answer

Decomposition

Answer

Synthesis

Answer

Displacement

Answer

Combustion

Question 18

A fuel combining with Oxygen yielding Carbon Dioxide and Water (and heat/energy)

Accepted Answer

Combustion

Answer

Synthesis

Answer

Decomposition

Answer

Displacement

Question 19

The arrow $$\rightarrow$$ in a chemical equation is read as,

Accepted Answer

yields

Answer

makes

Answer

produces

Answer

forms

Question 20

What effect does decreasing the surface area of the reactants have on the rate of reaction?

Accepted Answer

Decreases

Answer

Increases

Answer

Stays the same

Question 21

If we grind a reactant into a powder this will -?- the surface area and -?- the rate of a reaction.

Accepted Answer

increase, speed up

Answer

increase, slow down

Answer

decrease, slow down

Answer

decrease, speed up

Question 22

A chemical equation summarized as AB + CD $$\rightarrow$$ AD + CB is what type?

Accepted Answer

Double Displacement (Replacement)

Answer

Decomposition

Answer

Combustion

Answer

Synthesis

Question 23

Over time, Hydrogen Peroxide breaks down into Water and Hydrogen gas. What type of reaction is this?

Accepted Answer

Decomposition

Answer

Double Displacement (Replacement)

Answer

Combustion

Answer

Synthesis

Question 24

True or False - To know if a Chemical Reaction has occurred, you have to see ALL of the signs.

Accepted Answer

False

Answer

True

Question 25

A nail turns from a metallic gray to an orange brown when it rusts. This is an example of which sign of a chemical reaction?

Accepted Answer

Color Change

Answer

Precipitate Formation

Answer

Gas Production

Answer

Energy Change

Question 26

You put hydrogen peroxide on a cut to help clean it out. When you do, it fizzes and bubbles. This is an example of which sign of a chemical reaction?

Accepted Answer

Gas Production

Answer

Color Change

Answer

Precipitate Formation

Answer

Energy Change

Question 27

When there is a greater concentration of reactants, chemical reactions tend to happen

Accepted Answer

Faster

Answer

Slower

Question 28

In a combustion reaction, the REACTANTS are always

Accepted Answer

Oxygen + Fuel

Answer

Carbon Dioxide + Oxygen

Answer

Oxygen + Water

Answer

Fuel + Water

Question 29

Two of the products of a combustion reaction are

Accepted Answer

Carbon Dioxide + Water

Answer

Oxygen + Fuel

Answer

Oxygen + Water

Answer

Fuel + Water

Question 30

Another word for "Synthesis" is

Accepted Answer

combine

Answer

decompose

Answer

take apart

Answer

split

Question 31

Every substance in the universe can be described by a unique set of

Accepted Answer

properties

Answer

densities

Answer

masses

Answer

colors

Question 32

What combination of reactant traits would likely produce the fastest reaction rate?

Accepted Answer

Powdered & Hot

Answer

Whole & Cold

Answer

Powedered & Cold

Answer

Whole & Hot

Question 33

Putting food dye in water is a chemical reaction because the color changes

Accepted Answer

False

Answer

True

Question 34

Because it produces bubbles, boiling a pot of water is a chemical reaction/change.

Accepted Answer

False

Answer

True

Question 35

When a chemical reaction consumes more energy and takes it from its surroundings (causing them to cool) we describe it as

Accepted Answer

Endothermic

Answer

Exothermic

Question 36

When a chemical reaction releases energy/heat to its surroundings we describe it as

Accepted Answer

Exothermic

Answer

Endothermic

Question 37

2H₂+ O₂ $$\rightarrow$$ 2H₂O is an example of what type of reaction

Accepted Answer

Synthesis

Answer

Decomposition

Answer

Replacement

Answer

Combustion

Question 38

C₃H₈ + O₂ $$\rightarrow$$ CO₂ + H₂O (+heat/light/energy) is an example of what type of chemical reaction

Accepted Answer

Combustion

Answer

Synthesis

Answer

Decomposition

Answer

Displacement (Replacement)

Question 39

What combination of reactant traits would likely produce the slowest reaction rate?

Accepted Answer

Whole & Cold

Answer

Powdered & Hot

Answer

Powedered & Cold

Answer

Whole & Hot

Question 40

(Review)

4.23 grams is what type of observation/data?

Accepted Answer

Quantitative

Answer

Qualitative

Question 41

(Review)

Metallic is what type of observation/data?

Accepted Answer

Qualitative

Answer

Quantitative

Question 42

CaCO₃ $$\rightarrow$$ CaO + CO₂ is an example of which type of reaction?

Accepted Answer

Decomposition

Answer

Synthesis

Answer

Replacement (Displacement)

Answer

Combustion

Question 43

The reaction of vinegar and baking soda makes bubbles and gets slightly cooler.

What signs of a chemical reaction are shown by these observations?

Accepted Answer

Gas production

Accepted Answer

Change in Energy (Endothermic)

Answer

Precipitate

Answer

Color Change

Answer

Change in Energy (Exothermic)

Question 44

Many ingredients in baking are sold as powders or in granulated form.

Why?

Accepted Answer

Increased surface area

Answer

Easier to carry

Answer

So you use less

Answer

They bake hotter

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