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WorksheetsChemical Reactions Unit Review
Total questions: 20
Worksheet time: 15mins
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According to the Law of Conservation of Mass:
Matter is always created in a chemical reaction.
Matter is always destroyed in a chemical reaction.
Matter is created and then destroyed in a chemical reaction.
Matter is not created or destroyed in a chemical reaction.
What is a reactant?
A volatile chemical
A dangerous substance
The substance you start with before a chemical reaction
The substances that are formed by a chemical reaction
What is a product?
A volatile chemical
A dangerous substance
The substance you start with before a chemical reaction
The substances that are formed by a chemical reaction
What do chemical formulas tell us?
The number of atoms in the world
The number of atoms and elements a molecule contains
The physical arrangement of atoms
How many protons there are
Which statement about the law of conservation of mass is false?
The mass of the reactants must equal the mass of the products.
All of the atoms on the reactants side of an equation are also on the product side.
The reaction creates new types of atoms.
Atoms are not lost, but are rearranged.
Identify the Reactants in this equation.
A
B
How many reactants are in A + B ---> C ?
1
2
3
4
How many products are in A + B ---> 2C
1
2
3
4
If the image shows the reactants, which option must be true about the products?
There will be at least 4 atoms.
There will be 1 atom of A, B, C, and D.
There could be 1 atom of A, B, C, and D.
There will be exactly 5 atoms.
If the image shows the reactants of a chemical reaction, which choice represents the products?
What is corrosion?
The release of oxygen
Breakdown of a metal
Material becoming saturated with oil
Metals fusing together
