Q: The atomic radius of a uranium atom is approximately $$175\ \mathrm{pm}. In $$correct scientific notation, this is:

$$1.75 \times 10$$^{-10}$$\ \mathrm{m}$$

Question 1

Which subatomic particles have approximately equal masses?

Accepted Answer

protons and neutrons

Question 2

A $$^{16}_{8}\mathrm{O}$$ ion has 8 protons, 8 neutrons, and how many electrons?

Accepted Answer

10

Question 3

What value should be reported as the volume of a strip of aluminum foil measuring $$15.37\ \mathrm{cm} 	imes 4.25\ \mathrm{cm} 	imes 0.0010\ \mathrm{cm}$$?

Accepted Answer

$$0.065\ \mathrm{cm}^3$$

Question 4

The atomic radius of a uranium atom is approximately $$175\ \mathrm{pm}. In $$correct scientific notation, this is:

Accepted Answer

$$1.75 	imes 10$$^{-10}$$\ \mathrm{m}$$

Question 5

When comparing the dark Fraunhofer lines with lines emitted by burning elements, Bunsen and Kirchhoff concluded that:

Accepted Answer

each element absorbs and emits the same wavelengths

Question 6

Which of the following orbitals is the second lowest in energy (assuming they are all in the same shell)?

Accepted Answer

$$p$$

Question 7

If the principal quantum number is $$n = 7$$ and the angular momentum quantum number is $$l = 3$$ ($$f$$ orbital), which of the following values is NOT an allowed value of the magnetic quantum number ($$m_l$$)?

Accepted Answer

4

Question 8

Which transition in a hydrogen atom absorbs a photon with the longest wavelength?

Accepted Answer

$$n_i = 2 to$$ $$n_f = 3$$

Question 9

How many unpaired electrons does $$\mathrm{Co}^{2+}$$ have?

Accepted Answer

3

Question 10

What is the average molar mass (in g/mol) for the newly discovered element, Crionisotium, given the following data? 
Isotope: $$^{301}\mathrm{Cr}$$, Mass: $$300.94 g/$$mol, Abundance: $$73.10\%$$ 
Isotope: $$^{303}\mathrm{Cr}$$, Mass: $$302.95 g/$$mol, Abundance: $$26.90\%$$

Accepted Answer

$$301.54$$

Question 11

A $$12.0 g $$piece of dark chocolate is found to contain $$1.50 mg of $$caffeine. If the caffeine content in a $$600 mL $$mug of coffee is $$451 mg$$, how many kg of chocolate would you have to eat to consume the amount of caffeine in $$2$$ mugs of this particular coffee?

Accepted Answer

$$7.22 kg$$

Question 12

How many moles of $$\mathrm{H}_2\mathrm{CO}_3$$ are in $$450.0 g of$$ $$\mathrm{H}_2\mathrm{CO}_3$$? (Molar mass $$= 62.03 g/$$mol)

Accepted Answer

$$7.26$$ mol

Question 13

How many moles of H atoms are in $$450.0 g of$$ $$\mathrm{H}_2\mathrm{CO}_3$$?

Accepted Answer

$$14.52$$ mol$

Question 14

How many atoms of H are in $$450.0 g of$$ $$\mathrm{H}_2\mathrm{CO}_3$$?

Accepted Answer

$$8.74 	imes 10$$^{24}$$

Question 15

Arrange P, S, and Na in order of increasing first ionization energy.

Accepted Answer

Na \u003c P \u003c S

Question 16

Arrange P, S, and Na in order of increasing atomic radius.

Accepted Answer

S \u003c P \u003c Na

Question 17

Which of the following statements about atomic orbitals is correct?

Accepted Answer

A $$2p$$ orbital has a node at the nucleus.

Question 18

Which of the following best explains why the first ionization energy increases across a period?

Accepted Answer

Increasing nuclear charge with little increase in shielding

Question 19

Which of the following is a correct electron configuration for $$\mathrm{S} ($$sulfur)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^4$$

General Chemistry Exam Study Guide: Atomic Structure, Chemical Quantities, and Periodic Trends

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