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WorksheetsUnit 1 Chemical Reactions Review
Total questions: 50
Worksheet time: 26mins
A chemical reaction that absorbs heat.
Endothermic
Exothermic
Catalyst
Inhibitor
A chemical reaction that releases heat.
Exothermic
Endothermic
Catalyst
Inhibitor
Substances that form in a chemical reaction.
Reactants
Products
Producers
Reactions
The original substances in a chemical reaction.
Products
Reactants
Yields
Elements
_____________ changes do not change the substance into something different.
Chemical
Physical
Both chemical and physical
______________ changes will change the substance into something with different properties.
Physical
Chemical
Both chemical and physical
A force that holds atoms together.
molecules
physical bond
chemical bond
compounds
The building blocks of matter are ________________.
elements
atoms
molecules
compounds
Look at the diagram to see if the chemical reaction shown models the Law of Conservation of Matter.
Yes
No
How many hydrogen atoms are found on the reactant side of the chemical equation shown?
3
6
8
2
How many oxygen atoms are shown on the product side in the chemical equation shown?
6
12
18
36
Is the chemical equation shown balanced?
Yes
No
Identify the number of atoms in the chemical formula for Potassium Chromate. The chemical formula is shown in the picture.
4
8
25
28
Identify the number of elements in the chemical formula for Calcium Sulfate. The chemical formula for Calcium Sulfate can be seen in the picture.
12
4
3
6
Identify the number of molecules in the chemical formula for Butane. The chemical formula for Butane is shown in the picture.
5
70
14
20
How many molecules are shown in the diagram?
3
2
9
Particles of a suspension will settle while particles of a colloid do not. Why does this happen?
The particles in a suspension are larger than the particles in a colloid.
The particles in a suspension are smaller than the particles in a colloid.
The particles in a suspension have a higher temperature than the particles in a colloid.
The particles in a suspension have a lower temperature than the particles in a colloid.
Why is baking soda considered a pure substance but flour is not?
Baking soda is a compound and flour is a mixture.
Baking soda is an element and flour is a mixture.
Baking soda is a mixture and flour is a compound.
Baking soda is a mixture and flour is an element.
What is oxygen classified as?
An element
A compound
A molecule
A mixture
Identify the type of chemical reaction given in the picture.
Synthesis
Decomposition
Single Replacement
Double Replacement
If you want to store uncooked meat to keep it from spoiling, which would keep it longer and why?
A freezer because lowering the temperature slows the chemical reactions.
A refrigerator because increasing the temperature slows the chemical reactions.
A freezer because lowering the temperature slows physical reactions.
A refrigerator because increasing the temperature slows the physical reactions.
A substance that speeds up the rate of reaction when added is called a/an __________.
inhibitor
catalyst
exothermic reaction
endothermic reaction
In a solution, which part is the solute, the drink mix or water?
drink mix
water
In what type of reaction does one reactant form two or more products?
Synthesis
Decomposition
Single Replacement
Double Replacement
Identify the type of chemical reaction shown in the chemical equation pictured.
Synthesis
Decomposition
Single Replacement
Double Replacement
Identify what type of chemical reaction is being modeled.
Synthesis
Decomposition
Single Replacement
Double Replacement
Identify what type of chemical reaction is being shown in the picture.
Synthesis
Decomposition
Single Replacement
Double Replacement
An example of a natural fiber would be __________.
silk
nylon
spandex
rayon
This is a number placed in front of a chemical formula that shows how many molecules there are.
subscript
exponent
superscript
coefficient
Which of the following is NOT a natural resource?
wood
cotton
oil
plastic
coal
Synthetic Materials tend to be ___________________ than Natural materials.
less durable
more durable
just as durable
How many nitrogen atoms are in this compound?
1
2
4
Which of the following is considered a synthetic substance?
Plant Fibers
Petroleum
Plastic
Wood
What is a synthetic material?
Any material that is man made
Any material that is only made from natural resources
Any material that is made of recycled materials
Any material that is found in nature.
What is a polymer?
a group of repeating atoms
a long chain of repeating molecules
a long chain molecule with identical group of atoms
a long chain of different atoms
What is the definition of matter?
Anything that has mass and takes up space
A substance that is liquid, solid, or gas
Anything that is pure
Anything that you can see or hold
Solubility is what type of property?
Plastic is an example of a(n) ______________________ because it is made from natural resources that have been chemically processed.
synthetic material
natural material
biodegradable material
organic material
______________________ can be chemically processed to make synthetic materials.
Natural resources
Metals
Water
Air
Synthetic materials are made up of:
Natural fibers
natural resources
Minerals
Metals
Water is boiled in a bottle with a balloon over the top. As the water heats, the balloon expands. What has happened to the weight of this bottle and balloon in this experiment?
It has increased as the balloon expands.
It has decreased as the water boiled away.
It has stayed the same.
It is unpredictable because the balloon is flexible.
5 grams of orange Kool Aid powder is added to 100 grams of water. What would you expect the new solution to weigh?
95 grams
100 grams
105 grams
500 grams
When you break a cracker into pieces it is a...
Chemical change
Physical change
