Q: Which of the following is the correct formula for calculating molarity ($$M$$)?

$$M = \frac{\text{moles of solute}}{\text{volume of solution in liters}}$$

Question 1

Which of the following best describes the main goal of green chemistry?

Accepted Answer

To develop chemical processes that minimize environmental impact and waste.

Question 2

Which of the following is a chemical property?

Accepted Answer

Reactivity with oxygen

Question 3

Which statement best explains why water is considered a compound?

Accepted Answer

It is made up of two or more elements chemically combined in a fixed ratio.

Question 4

According to Dalton’s atomic theory, which statement is correct?

Accepted Answer

Atoms of the same element are identical in mass and properties.

Question 5

Which subatomic particle determines the identity of an element?

Accepted Answer

Proton

Question 6

Which of the following best describes an ionic bond?

Accepted Answer

A bond formed by the transfer of electrons from one atom to another.

Question 7

Given the following reaction: $$2H_2 + O_2$ \rightarrow 2H_2O$$, how many moles of $$H_2O$$ are produced from 4 moles of $$O_2$$?

Accepted Answer

8 moles

Question 8

Which of the following elements is most likely to form a cation?

Accepted Answer

Sodium

Question 9

Which of the following is the correct formula for calculating molarity ($$M$$)?

Accepted Answer

$$M = \frac{	ext{moles of solute}}{	ext{volume of solution in liters}}$$

Question 10

A sample of gas occupies 2.0 L at 1.0 atm and 300 K. What will be its volume at 2.0 atm and 300 K? (Assume ideal gas behavior.)

Accepted Answer

1.0 L

Question 11

Which of the following intermolecular forces is strongest in water ($$H_2O$$)?

Accepted Answer

Hydrogen bonding

Question 12

Which of the following best explains why metals are good conductors of electricity?

Accepted Answer

They have loosely bound valence electrons that can move freely.

Question 13

Which of the following statements about the periodic table is correct?

Accepted Answer

Elements in the same group have similar chemical properties.

Question 14

Which of the following is a physical change?

Accepted Answer

Melting of ice

Question 15

A solution is prepared by dissolving 10.0 g of NaCl in enough water to make 500 mL of solution. What is the molarity of the solution? (Molar mass of NaCl = 58.44 g/mol)

Accepted Answer

0.171 M

Question 16

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electrons between two nonmetals.

Question 17

Which of the following is a correct statement about the kinetic molecular theory of gases?

Accepted Answer

Gas particles are in constant, random motion.

Question 18

Which of the following is the correct expression for the ideal gas law?

Accepted Answer

$$PV = nRT$$

Question 19

Which of the following best explains why ice floats on water?

Accepted Answer

Hydrogen bonding causes ice to have an open, hexagonal structure.

Question 20

Which of the following is an example of a chemical change?

Accepted Answer

Burning wood

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