Quiz about Properties, Chemical Reactions and Heat Review

Question 1

The smallest particle of an element; made of electrons, protons, and neutrons

Accepted Answer

Atoms

Answer

Elements

Answer

Molecules

Answer

Products

Question 2

The process by which one or more substances change to produce one or more different substances

Accepted Answer

Chemical Reaction

Answer

Chemical Process

Answer

Reactant

Question 3

The simplest unit of a chemical compound that can exist; formed when two or more atoms join together chemically

Accepted Answer

Molecule

Answer

Atom

Answer

Compound

Question 4

A solid that is deposited from a solution

Accepted Answer

Precipitate

Answer

Solid

Answer

Liquid

Answer

Product

Question 5

A substance produced during a chemical reaction

Accepted Answer

Product

Answer

Reactant

Answer

Properties

Question 6

Physical and chemical characteristics of matter used to describe or identify a substance

Accepted Answer

Properties

Answer

Chemical Reaction

Answer

Product

Question 7

A substance that takes part in and undergoes change during a reaction

Accepted Answer

Reactant

Answer

Product

Answer

Molecule

Question 8

A chemical reaction or process that absorbs heat from the surroundings

Accepted Answer

Endothermic

Answer

Exothermic

Question 9

A chemical reaction or process that releases heat.

Accepted Answer

Exothermic

Answer

Endothermic

Question 10

Which of the following is a chemical change rather than a physical change

Accepted Answer

cooking a cake

Answer

boiling water at 100 C

Answer

chopping up a piece of wood.

Answer

ice carbon dioxide sublimating to gas

Question 11

The only way you can be certain that a chemical reaction has occured is by?

Accepted Answer

identifying one or more new chemical products

Answer

Light has been emitted

Answer

a colour change has occurred

Answer

bubbles appear

Question 12

a copper penny turning greenish after a few years.

Accepted Answer

Chemical Change

Answer

Physical Change

Question 13

When a scientist mixed two chemicals, an exothermic reaction takes place. Which of the following would be proof that the reaction was exothermic?

Accepted Answer

a temperature increase

Answer

a change of color

Answer

a change of state

Answer

a temperature decrease

Question 14

A scientist combines chemicals and produces an exothermic reaction. What byproduct of this reaction would show that it is exothermic?

Accepted Answer

heat

Answer

coolness

Answer

a precipitate

Answer

gas bubbles

Question 15

What type of change occurs when a new substance is formed that has different properties from the original substances?

Accepted Answer

chemical change

Answer

nuclear change

Answer

physical change

Answer

mutation

Question 16

How do chemical reactions turn substances into new substances?

Accepted Answer

the atoms break apart and combine back together in new ways

Answer

with burning acid

Answer

the molecules mix together and create new substances

Answer

the ionic compounds mix in water to form solutions

Question 17

Is ths a chemical or a physical change?

Accepted Answer

Physical change

Answer

Chemical change

Question 18

Why is tearing a piece of paper only a physical change?

Accepted Answer

It only changes its size, but it's still paper

Answer

It changes the paper.

Answer

It is hard to tear.

Answer

None of the above

Question 19

Is burning a campfire a chemical or physical change?

Accepted Answer

Chemical

Answer

Physical

Question 20

WHY is burning a campfire a chemical change?

Accepted Answer

It created a new substance with new properties

Answer

It changes in size

Answer

There is a lot of smoke

Answer

The logs get smaller

Question 21

Is ice freezing a physical or chemical change?

Accepted Answer

physical

Answer

chemical

Question 22

Why is ice freezing ONLY a physical change?

Accepted Answer

The molecules of water do NOT change. They only slow down and vibrate in position.

Answer

The ice is colder than water.

Answer

It can stay cold when you put it in the freezer.

Answer

Its physical appearance does NOT change.

Question 23

What term is given to a reaction which transfers heat energy to the surroundings?

Accepted Answer

Exothermic

Answer

Endothermic

Answer

Reversible

Answer

Exotermic

Question 24

When barium hydroxide and ammonium chloride react, the temperature of the mixture decreases. What kind of reaction is this?

Accepted Answer

Endothermic

Answer

Decomposition

Answer

Exothermic

Answer

Indothermic

Question 25

if more heat energy is released in making bonds in the products than is taken in when breaking bonds in the reactants

Accepted Answer

Exothermic

Answer

Endothermic

Answer

Exotermic

Answer

Endotermic

Question 26

if less heat energy is released in making bonds in the products than is taken in when breaking bonds in the reactants

Accepted Answer

Endothermic

Answer

Exotermic

Answer

Exothermic

Answer

Entrothermic

Question 27

What type of chemical reaction absorbs energy and requires energy for the reaction to occur?

Accepted Answer

Endothermic

Answer

Exotermic

Answer

Exothermic

Answer

Endotermic

Question 28

_____ reactions usually feel hot!

Accepted Answer

exothermic

Answer

endothermic

Question 29

____ reactions usually feel cold.

Accepted Answer

endothermic

Answer

exothermic

Question 30

Baking pizza in the oven

Accepted Answer

endothermic

Answer

exothermic

Question 31

A sunflower makes food during photosynthesis.

Accepted Answer

endothermic

Answer

exothermic

Question 32

Exothermic reactions release energy. Before these reactions occur, where is the necessary energy stored?

Accepted Answer

In the chemical bonds of the reactants of the reaction.

Answer

The substance's surroundings.

Answer

The air

Question 33

any characteristic of matter that you can observe without changing the identity of the substances that make it up

Accepted Answer

physical property

Answer

chemical property

Answer

periodic table

Answer

conglomerate

Question 34

a characteristic of matter you observe as it reacts or changes into a different substance

Accepted Answer

chemical property

Answer

physical property

Answer

periodic table

Answer

conglomerate

Question 35

the ability of one material to dissolve in another

Accepted Answer

solubility

Answer

boiling point

Answer

melting point

Answer

state of matter

Question 36

the temperature at which a solid changes to a liquid

Accepted Answer

melting point

Answer

solubility

Answer

boiling point

Answer

state of matter

Question 37

the temperature at which a liquid changes to a gas

Accepted Answer

boiling point

Answer

solubility

Answer

melting point

Answer

state of matter

Question 38

The ability to burn is a ___ property.

Accepted Answer

chemical

Answer

physical

Answer

conservitive

Answer

reversed

Question 39

Dissolving a solid into a liquid is a ___.

Accepted Answer

physical change

Answer

chemical change

Question 40

A change in a substance that only affects size, shape or state of matter.

Accepted Answer

physical change

Answer

chemical change

Answer

chemical property

Answer

endothermic

Question 41

___ change - causes the identity of a substance to change; something new is formed.

Accepted Answer

chemical

Answer

formation

Answer

physical

Answer

conservation

Question 42

Describe the physical and chemical properties of an emergency raft that will take you to safety

Accepted Answer

Solid at room temperature

Accepted Answer

Less dense than water (floats)

Answer

Reacts with exposure to water

Answer

Corrosive

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