Quiz about Chemical Reactions

Question 1

True or false? Chemical reactions are easily reversible

Accepted Answer

False

Answer

True

Question 2

True or false: A change in state is a chemical reaction

Accepted Answer

False - a change in state is a physical change

Answer

True - something melting would be an example of a chemical reaction

Question 3

In a word equation, the starting chemicals are called...

Accepted Answer

reactants

Answer

products

Answer

ingredients

Question 4

In this chemical reaction, which is the product/s?

Magnesium + Oxygen --> Magnesium oxide

Accepted Answer

magnesium oxide

Answer

magnesium

Answer

magnesium and oxygen

Answer

oxygen

Question 5

A material that burns to transfer energy is called a...

Accepted Answer

fuel

Answer

compound

Answer

wood

Answer

petrol

Question 6

What is the scientific term given when something burns?

Accepted Answer

combustion

Answer

a fuel

Answer

flammable

Answer

heating

Question 7

What does a fuel need in order to burn?

Accepted Answer

oxygen

Answer

fuel

Answer

electricity

Answer

hydrogen

Question 8

When energy is transferred from the substances to the surroundings during a chemical reaction, what type of reaction is this?

Accepted Answer

exothermic

Answer

endothermic

Answer

decomposition

Answer

combustion

Question 9

In an endothermic reaction is energy transferred to the surroundings or to the substances?

Accepted Answer

substances

Answer

surroundings

Question 10

In a chemical reaction, the temperature is measured and it appears to increase. Is this an example of an exothermic or endothermic reaction?

Accepted Answer

exothermic

Answer

endothermic

Question 11

Which is NOT an example of something you could observe that would suggest a chemical reaction is taking place?

Accepted Answer

melting

Answer

fizzing

Answer

smells

Answer

temperature change

Question 12

What does "rearrange" mean?

Accepted Answer

To not add or take away but to move things around. To remix

Answer

To make sure to read all of the answers on the quiz

Answer

To not just choose the longest answer because sometimes teachers put in long answers to make sure you are paying attention.

Answer

To not pick the shortest answer

Question 13

The diagram above shows the repeating groups of atoms that make up two samples. Both samples are red powdery solids at room temperature. Will the other properties of the two samples be the same or different? (Examples of properties are smell, color, and the temperature at which a substance melts.)

Accepted Answer

The other properties will be same because the repeating groups of atoms that make up the two samples are the same.

Answer

The other properties will be different because there are more repeating groups of atoms in Sample 1.

Answer

The other properties will be the same because both samples are red at room temperature.

Answer

The other properties will be the same because both samples are powdery solids at room temperature.

Question 14

Can one substance change into another substance? (read carefully)

Accepted Answer

Yes, because atoms can be rearranged.

Answer

No, because things can mix, but they can't change into new things

Answer

Yes, because new atoms can be created

Answer

No, because atoms can not be destroyed

Question 15

The diagram above shows the repeating groups of atoms that make up two samples. Both samples are solids at room temperature. Will the other properties of the two samples likely be the same or different? (Examples of properties are smell, color, and the temperature at which a substance melts.)

Accepted Answer

The other properties will likely be different because the repeating groups of atoms that make up the two samples have different numbers of atoms.

Answer

The other properties will likely be different because there are more repeating groups of atoms in Sample 2.

Answer

The other properties will likely be the same because the repeating groups of atoms that make up the two samples have the same types of atoms.

Answer

The other properties will likely be the same because both samples are solids at room temperature.

Question 16

Andres is a chemist working at a company that makes ink. To make a new kind of ink, Andres mixed two liquid substances together in a sealed container. The diagram above shows the repeating groups of atoms that make up the two starting substances.

After mixing, Andres found two solid substances in the sealed container. (Nothing had escaped.) Which of the diagrams to the left shows the repeating groups of atoms that make up the ending substances?

Accepted Answer

Option A is correct

Answer

B.

Answer

C.

Answer

D.

Question 17

What is a reactant?

Accepted Answer

A starting substance before a chemical reaction

Answer

Something that actanats again

Answer

A potato

Answer

What happens when you have the reflexes of a ninja and can react quickly.

Question 18

Samira watched a demonstration in which a scientist combined two substances in a sealed container and analyzed the results. The ending substances did not look the same as the starting substances.

Samira was given a diagram with the repeating groups of atoms that make up the starting substances, plus information about the properties of the starting and ending substances. She created a model of the repeating groups of atoms that might make up the two ending substances.

Accepted Answer

Samira's model correctly demonstrates how the properties changed with the rearrangement of the atoms. However not all atoms are accounted for. There is a missing reactant.

Answer

Samira's model is correct because the properties are different and the atoms are rearranged.

Answer

Samira's model is incorrect because not all atoms are accounted for

Answer

Samira's model correctly demonstrates how the properties changed with the rearrangement of the atoms. However not all atoms are accounted for. There is a missing product.

Question 19

What is a product (in chemical reactions)?

Accepted Answer

The substance(s) that are created after a chemical reaction

Answer

Something a company will try to sell to you

Answer

Also a potato

Answer

When the mitosis space-time folds into a tetrahedron flux-capacitor

Question 20

The diagram above shows the repeating groups of atoms that make up two samples. Both samples are gases at room temperature. Will the other properties of the samples likely be the same or different? (Examples of properties are smell, color, and the temperature at which a substance melts.)

Accepted Answer

The other properties will likely be different because the repeating groups of atoms that make up the two samples have different numbers of atoms.

Answer

The other properties will likely be the same because the repeating groups of atoms that make up the two samples have the same types of atoms.

Answer

The other properties will likely be the same because both samples are gases at room temperature.

Answer

The other properties will likely be different because there are more repeating groups of atoms in Sample 1.

Question 21

What is an atom?

Accepted Answer

The Hydrogen (H)s and the Oxygen (O)s are atoms

Answer

Water is an atom

Answer

The H2O is an atom

Answer

None of these are atoms

Question 22

What is a molecule?

Accepted Answer

The H2O is a molecule

Answer

The Hydrogen (H)s and the Oxygen (O)s are molecules

Answer

The H2O is an atom

Answer

None of these are molecules

Question 23

Is burning wood a chemical or physical change?

Accepted Answer

chemical

Answer

physical

Question 24

If two substances react and the temperature of the mixture decreases. Example the athletic trainer gives you a pack that gets cold when you shake it.

Accepted Answer

Endothermic reaction

Answer

Exothermic reaction

Question 25

The diagram above shows the repeating groups of atoms that make up two samples. Will the properties of the two samples likely be the same or different? (Examples of properties are smell, color, and the temperature at which a substance melts.)

Accepted Answer

The properties will likely be different because the repeating groups of atoms that make up each sample are different.

Answer

The properties will likely be different because there are more repeating groups of atoms in Sample 2.

Answer

The properties will likely be the same because the repeating groups of atoms that make up the two samples have one of the same types of atoms.

Answer

The properties will likely be the same because the repeating groups of atoms that make up the two samples have the same number of atoms.

Question 26

A company that makes frying pans needs to create a new substance to coat the pans. The substance must have a high melting point. To create this new substance, workers mixed together two substances that melt at low temperatures in a sealed container. The diagram above shows the repeating groups of atoms that make up the two starting substances.

After mixing, the workers found two substances that melt at higher temperatures in the sealed container. (Nothing had escaped.) Which of the diagrams to the left shows the repeating groups of atoms that make up the ending substances?

Accepted Answer

Option A is correct

Answer

B.

Answer

C.

Answer

D.

Question 27

Andres is a chemist working at a company that makes ink. To make a new kind of ink, Andres mixed two liquid substances together in a sealed container. The diagram above shows the repeating groups of atoms that make up the two starting substances.

After mixing, Andres found two solid substances in the sealed container. (Nothing had escaped.) Which of the diagrams to the left shows the repeating groups of atoms that make up the ending substances?

Accepted Answer

Option A is correct

Answer

B.

Answer

C.

Answer

D.

Question 28

Jacob mixed two samples together: a colorless gas with no smell and a colorless liquid that smells like bleach. He analyzed the results and found two ending substances. One of the ending substances was a green gas. This ending substance is made up of the repeating group of atoms shown above. Which of the diagrams to the left shows the repeating groups of atoms that make up the samples Jacob mixed together?

Accepted Answer

Option B is correct

Answer

A.

Answer

C.

Answer

D.

Question 29

Paula works at a paint company and is developing new ingredients to make paint safer to use. She mixed two colorless substances together in a sealed container. The diagram above shows the repeating groups of atoms that make up the two starting substances.

After mixing, Paula found two yellow substances in the sealed container. (Nothing had escaped.) Which of the diagrams to the left shows the repeating groups of atoms that make up the ending substances?

Accepted Answer

Option C is correct

Answer

A.

Answer

B.

Answer

D.

Question 30

Devorah is a food chemist, and she is developing a chemical to help foods stay fresh longer. She mixed a red liquid substance and a colorless solid substance together in a sealed container. The diagram above shows the repeating groups of atoms that make up the two starting substances.

After mixing, Devorah found two white substances in the sealed container. (Nothing had escaped.) Which of the diagrams to the left shows the repeating groups of atoms that make up the ending substances?

Accepted Answer

Option C is correct

Answer

A.

Answer

B.

Answer

D.

Question 31

the temperature at which a substance changes from the liquid phase to the gas phase

Accepted Answer

boiling point

Answer

melting point

Answer

sublimation point

Answer

energy point

Question 32

letters and numbers showing the types and number of atoms that repeat to make up a substance

Accepted Answer

chemical formula

Answer

chemical reaction

Answer

molecule

Answer

phase change diagram

Question 33

a process in which atoms rearrange to form new substances

Accepted Answer

chemical reaction

Answer

phase change

Answer

periodic table of elements

Answer

science

Question 34

formed by repeating groups of atoms that link together in a large network

Accepted Answer

extended structure

Answer

cell

Answer

organism

Answer

substance

Question 35

the temperature at which a substance changes from the solid phase to the liquid phase

Accepted Answer

melting point

Answer

boiling point

Answer

passing point

Answer

phase change point

Question 36

an object, diagram, or computer program that helps us understand something by making it simpler or easier to see

Accepted Answer

model

Answer

picture

Answer

graph

Answer

image

Question 37

a group of atoms joined together in a particular, specific way

Accepted Answer

molecule

Answer

substance

Answer

water

Answer

matter

Question 38

an ending substance that is made during a chemical reaction; the BLUE portion in the shown image

Accepted Answer

product

Answer

reactant

Question 39

a starting substance that is part of a chemical reaction; the RED portion in the shown image

Accepted Answer

reactant

Answer

product

Question 40

something that can be qualitatively or quantitatively observed about a substance, such as color, smell, or boiling point

Accepted Answer

property

Answer

energy

Answer

size

Answer

order

Question 41

to change the order or position of something

Accepted Answer

rearrange

Answer

convert

Answer

transfer

Answer

model

Question 42

the relative size of things

Accepted Answer

scale

Answer

atom

Answer

rearrange

Answer

property

Question 43

something that is made of all the same atoms or groups of atoms

Accepted Answer

substance

Answer

matter

Answer

energy

Answer

molecule

Question 44

In a ___________change, a substance changes into a different substance.

Accepted Answer

Chemical

Answer

Physical

Question 45

Which of these is NOT a sign that a chemical change has occurred?

Accepted Answer

A loss of transparency

Answer

An unexpected color change

Answer

A temperature change

Answer

The formation of a precipitate

Question 46

The Law of Conservation of Mass states

Accepted Answer

that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

Answer

that matter exists in all states and reacts the same

Answer

that matter can only be changed into new substances by introducing a catalyst

Answer

that matter exists in the same state throughout any chemical change

Question 47

What kind of mixture is shown in the picture?

Accepted Answer

Heterogeneous

Answer

Homogeneous

Question 48

What kind of mixture is shown in the picture?

Accepted Answer

Homogeneous

Answer

Heterogeneous

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