Question 1

Which of the following correctly expresses 0.000345 meters using an appropriate metric prefix?

Accepted Answer

$$345$$ \mu m$

Question 2

A chemist needs to convert 250.0 mL of a solution to liters for a calculation. Which of the following is the correct conversion?

Accepted Answer

$$0.250 L$$

Question 3

A student measures the mass of a sample three times and obtains values of 2.51 g, 2.50 g, and 2.52 g. The true mass is 2.80 g. Which statement best describes the measurements?

Accepted Answer

The measurements are precise but not accurate.

Question 4

How many significant figures are in the measurement 0.0045600 g?

Accepted Answer

6

Question 5

A block has a mass of 12.0 g and a volume of 8.0 cm$$^3. $$What is its density?

Accepted Answer

$$1.5 g/cm$^3$$

Question 6

Which of the following is a macroscopic property?

Accepted Answer

The boiling point of water

Question 7

Which statement best summarizes modern atomic theory?

Accepted Answer

Atoms are composed of protons, neutrons, and electrons, and can undergo nuclear reactions.

Question 8

An atom of $$^{23}_{11}Na $$has:

Accepted Answer

11 protons, 12 neutrons, 11 electrons

Question 9

Which of the following is a homogeneous mixture?

Accepted Answer

Salt dissolved in water

Question 10

How many moles are in 18.0 g of water ($$H_2O$$)? (Molar mass of $$H_2O = 18.0 g/$$mol)

Accepted Answer

$$1.00$$ mol

Question 11

Calculate the molecular mass of glucose ($$C_6H_{12}O_6$). (Atomic masses: C = 12.0, H = 1.0, O = 16.0)

Accepted Answer

$$180.0 g/$$mol

Question 12

Which experiment demonstrated the particle nature of light?

Accepted Answer

The photoelectric effect

Question 13

Which of the following best describes the wave-particle duality of matter?

Accepted Answer

Electrons can behave as both waves and particles.

Question 14

Which technique is commonly used to identify elements based on the light they emit or absorb?

Accepted Answer

Spectroscopy

Question 15

According to the Bohr model, which transition in the hydrogen atom emits the highest energy photon?

Accepted Answer

From $$n=2 to$$ $$n=1$$

Question 16

Which of the following is a valid set of quantum numbers for an electron in a 3p orbital?

Accepted Answer

$$n=3,\ l=1,\ m_l=0,\ m_s=+\frac{1}{2}$$

Question 17

Which electron configuration represents a neutral atom of nitrogen (atomic number 7)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^3$$

Question 18

A sample of gas has a mass of 0.500 g and occupies a volume of 250 mL at room temperature. What is its density in g/L?

Accepted Answer

$$2.00 g/L$$

Question 19

A solution is prepared by dissolving 5.00 g of NaCl (molar mass = 58.44 g/mol) in water to make 250.0 mL of solution. What is the molarity of the solution?

Accepted Answer

$$0.342 M$$

General Chemistry: Fundamental Concepts and Atomic Structure

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