Question 1

Which of the following best describes a compound?

Accepted Answer

A pure substance made of two or more elements chemically joined together.

Question 2

Which statement about the periodic table is correct?

Accepted Answer

A vertical column is called a group and contains elements with similar chemical properties.

Question 3

Which of the following is a physical change?

Accepted Answer

Melting of ice into water.

Question 4

What is the correct symbol for the element sodium?

Accepted Answer

Na

Question 5

Which of the following is a heterogeneous mixture?

Accepted Answer

Salad with lettuce, tomatoes, and cucumbers

Question 6

Which of the following best describes the law of conservation of mass in a chemical reaction?

Accepted Answer

The total mass of reactants must equal the total mass of products.

Question 7

Which of the following is the correct balanced chemical equation for the reaction of carbon with oxygen to form carbon dioxide?

Accepted Answer

$$\mathrm{C} + \mathrm{O}_2 \rightarrow \mathrm{CO}_2$$

Question 8

Which of the following is NOT a step in balancing a chemical equation?

Accepted Answer

Change the subscripts in chemical formulas to balance atoms.

Question 9

What does the chemical formula $$\mathrm{H}_2\mathrm{O}_2$$ indicate?

Accepted Answer

Two hydrogen atoms and two oxygen atoms

Question 10

Which of the following elements is a transition metal?

Accepted Answer

Fe

Question 11

Which of the following is the correct SI unit for mass?

Accepted Answer

kilogram ($$kg)$$

Question 12

A chemical change results in:

Accepted Answer

A change in the chemical identity of a substance.

Question 13

Which of the following is a chemical reaction?

Accepted Answer

Rusting of iron

Question 14

Which of the following is the correct SI unit for length?

Accepted Answer

meter ($$m)$$

Question 15

Which of the following is an example of a homogeneous mixture?

Accepted Answer

Salt dissolved in water

Question 16

What does a coefficient in a chemical equation represent?

Accepted Answer

The number of molecules or formula units of a substance

Question 17

Which of the following is true about elements on the left side of the staircase line in the periodic table?

Accepted Answer

They are metals.

Question 18

Which of the following is the correct chemical formula for water?

Accepted Answer

$$\mathrm{H}_2\mathrm{O}$$

Question 19

Which of the following is a pure substance?

Accepted Answer

Salt ($$\mathrm{NaCl})$$

Question 20

Which of the following is the correct order of steps for balancing a chemical equation?

Accepted Answer

Examine the equation, balance one element at a time, check if balanced.

Foundations of Matter and Chemical Change: Study Notes for GOB Chemistry

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