Q: How many micrograms are in 65.3 kg?

$$6.53 \times 10$$^{10}$$\ \mu\text{g}$$

Q: Radio waves travel at the speed of light ($$3.00 \times 10^8$\ \text{m/s}). $$How many kilometers will radio messages to outer space travel in exactly one year? (1 year = 365.24 days)

$$9.46 \times 10$$^{12}$$\ \text{km}$$

Q: A patient is given a dose of 0.5 mg of a medication. How many grams is this?

$$5.0 \times 10$$^{-4}$$\ \text{g}$$

Question 1

Mercury is the only metal that exists as a liquid at room temperature. Its density is 13.6 g/cm³. Convert this density to pounds per cubic inch. (Given: $$1\ 	ext{in} = 2.54\ 	ext{cm}$$, $$1\ 	ext{lb} = 454\ 	ext{g})$$

Accepted Answer

$$0.491\ 	ext{lb/in}^3$$

Question 2

Silicon has three naturally occurring isotopes: $$^{28}	ext{Si} (92.22$$%, 27.976927 amu), $$^{29}	ext{Si} (4.69$$%, 28.976495 amu), and $$^{30}	ext{Si} (3.09$$%, 29.973770 amu). Calculate the atomic mass of silicon.

Accepted Answer

$$28.0855\ 	ext{amu}$$

Question 3

Lithium has two naturally occurring isotopes: $$^6	ext{Li} (6.015123 $$amu) and $$^7	ext{Li} (7.016005 $$amu). The atomic mass of lithium is 6.9412 amu. What is the percent abundance of lithium-6?

Accepted Answer

$$7.47\%$$

Question 4

Bromine-81 ($$^{81}	ext{Br}) is an $$isotope of bromine. Which combination correctly lists the atomic number, number of neutrons, and mass number, respectively?

Accepted Answer

35, 46, 81

Question 5

Which of the following does NOT have a uniform composition throughout?

Accepted Answer

heterogeneous mixture

Question 6

How many micrograms are in 65.3 kg?

Accepted Answer

$$6.53 	imes 10$$^{10}$$\ \mu	ext{g}$$

Question 7

Express $$122.0^{\circ}$$	ext{F}$$ in $$^{\circ}	ext{C}$$.

Accepted Answer

$$50.0^{\circ}$$	ext{C}$$

Question 8

If the temperature is $$38.0^{\circ}$$	ext{F}$$, what is the temperature in kelvins?

Accepted Answer

$$276.5\ 	ext{K}$$

Question 9

Radio waves travel at the speed of light ($$3.00 	imes 10^8$\ 	ext{m/s}). $$How many kilometers will radio messages to outer space travel in exactly one year? (1 year = 365.24 days)

Accepted Answer

$$9.46 	imes 10$$^{12}$$\ 	ext{km}$$

Question 10

A graduated cylinder contains 15.5 mL. After a metal with a mass of 7.95 g is dropped in, the volume increases to 95.2 mL. What is the density of the metal?

Accepted Answer

$$0.0835\ 	ext{g/mL}$$

Question 11

Which element is a metalloid according to the periodic table provided?

Accepted Answer

Silicon (Si)

Question 12

Which group in the periodic table contains the noble gases?

Accepted Answer

Group 18

Question 13

A patient is given a dose of 0.5 mg of a medication. How many grams is this?

Accepted Answer

$$5.0 	imes 10$$^{-4}$$\ 	ext{g}$$

Question 14

Which of the following elements is a nonmetal?

Accepted Answer

Nitrogen (N)

Question 15

Which element is an alkali metal?

Accepted Answer

Potassium (K)

Question 16

Which element is found in Group 2A and is essential for bone health?

Accepted Answer

Calcium (Ca)

Question 17

A compound contains only one type of atom. Which term best describes this substance?

Accepted Answer

element

Question 18

Which of the following is a transition element?

Accepted Answer

Copper (Cu)

Question 19

Which element is a halogen?

Accepted Answer

Fluorine (F)

Question 20

Which element is most likely to be used in the electronics industry due to its semiconducting properties?

Accepted Answer

Silicon (Si)

Exam 2 Practice Problems – Step-by-Step Guidance

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