Quiz about Chemical Reactions

Question 1

The substances listed on the right side of a chemical equation are the

Accepted Answer

Products

Answer

Yields

Answer

Reactants

Answer

Precipitates

Question 2

CaCO₃ represents a chemical

Accepted Answer

Formula

Answer

Symbol

Answer

Subscript

Answer

Reaction

Question 3

The substances listed on the left side of a chemical equation are the

Accepted Answer

Reactants

Answer

Products

Answer

Coefficients

Answer

Precipitates

Question 4

In chemical reactions, what does the principle of conservation of mass mean?

Accepted Answer

Matter is not created or destroyed.

Answer

The total mass of the reactants is greater than the total mass of the products.

Answer

The total mass of the reactants is less than the total mass of the products.

Answer

Matter is not changed.

Question 5

A molecule is smaller than an atom.

Accepted Answer

False

Answer

True

Question 6

How many Oxygen (O) atoms are in 2C₂HO₈C_l2

Accepted Answer

16

Answer

2

Answer

8

Answer

5

Question 7

A molecule is________

Accepted Answer

more than one atom bonded together

Answer

a glob of gelatinous goo

Answer

smaller than an atom

Answer

filled with raisons

Question 8

How many elements are in C₆H₁₂O₆?

Accepted Answer

3

Answer

1

Answer

2

Answer

4

Question 9

Which of the following shows the correct way to write the following chemical equation?

Fe + O₂ -> Fe₂O₃

Accepted Answer

4Fe + 3O₂ -> 2Fe₂O₃

Answer

2 Fe + 3O₂ -> Fe₂O₆

Answer

4 Fe + O₆ -> 2Fe₂O₃

Answer

None of the options are correctly balanced.

Question 10

In a closed system, a chemical reaction takes place.  The mass of the reactants in the beginning of the reaction is 25g.  What does the mass have to be in the end of the reaction in order to follow the law of conservation of mass?

Accepted Answer

25g

Answer

You can't tell with the given information.

Answer

30g

Answer

15g

Question 11

There are two reactants in a chemical equation, and one product.  The mass of the product is 30g.  The mass of the first reactant is 17g.  What must the mass of the second reactant be, if the equation is to follow the law of conservation of mass?

Accepted Answer

13g

Answer

47g

Answer

23g

Answer

You cant tell with the given information

Question 12

Students react baking soda & vinegar.
Which of the following would provide the evidence that the number of atoms present before a chemical reaction is equal to the number of atoms present after the chemical reaction?

Accepted Answer

The mass of the plastic bag, baking soda, and vinegar before the reaction was equal to the mass after the reaction.

Answer

Bubbles were produced during the reaction, which meant that a gas was being produced.

Answer

The plastic bag did not change in any way, indicating that it was not involved in the reaction.

Answer

The mass of the baking soda was exactly equal to the mass of the vinegar used to create the chemical reaction.

Question 13

How many IRON (Fe) atoms are in this chemical formula?

Accepted Answer

4 iron atoms

Answer

2 iron atoms

Answer

8 iron atoms

Answer

3 iron atoms

Question 14

In a chemical reaction, new/different atoms can be created

Accepted Answer

False

Answer

True

Question 15

In a chemical reaction, new/different molecules can be created

Accepted Answer

True

Answer

False

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