Question 1

A 21.8 g sample of osmium has a density of $$22.6\ \mathrm{g/cm^3$}. $$What is the volume of the sample in $$\mathrm{cm^3$}$$, reported to the correct number of significant figures?

Accepted Answer

$$0.965\ \mathrm{cm^3$}$$

Question 2

A patient weighing 185 pounds has 1.4% of their body mass as calcium. How many kilograms of calcium are in their body? ($$1\ \mathrm{kg} = 2.20\ \mathrm{lb})$$

Accepted Answer

$$1.2\ \mathrm{kg}$$

Question 3

Which of the following best describes the location and properties of a neutron?

Accepted Answer

Approximate mass $$1\ \mathrm{amu}$$; charge $$0$$; inside nucleus

Question 4

A gold sample ($$150.\ \mathrm{g}) is $$heated from $$25\ ^\circ\mathrm{C} to$$ $$175\ ^\circ\mathrm{C}. If $$the specific heat of gold is $$0.0308\ \mathrm{cal/g\ ^\circ C}$$, how many calories are required?

Accepted Answer

$$693\ \mathrm{cal}$$

Question 5

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

Accepted Answer

Grinding coffee beans

Question 6

A thermometer reads $$95\ ^\circ\mathrm{F} on a $$hot day. What is this temperature in degrees Celsius?

Accepted Answer

$$35\ ^\circ\mathrm{C}$$

Question 7

Which of the following numbers has the greatest number of significant figures?

Accepted Answer

$$0.4470$$

Question 8

Which of the following substances would show the greatest temperature change upon absorbing $$100.0\ \mathrm{J} of $$heat? (Assume $$10.0\ \mathrm{g} of $$each substance.)

Accepted Answer

Gold ($$\mathrm{S.H.} = 0.128\ \mathrm{J/g\ ^\circ C})$$

Question 9

A diet has a total caloric intake of $$1400\ \mathrm{kcal}. If $$protein provides $$35\% of $$the calories, how many kcal come from protein?

Accepted Answer

$$490\ \mathrm{kcal}$$

Question 10

Which of the following is a chemical change?

Accepted Answer

Tarnishing of silver

Question 11

A radiation lab orders $$64\ \mu\mathrm{Ci} of$$ $$\mathrm{P}-32. $$After $$42.9$$ days, the activity is $$8.0\ \mu\mathrm{Ci}. $$What is the half-life of $$\mathrm{P}-32$$?

Accepted Answer

$$14.3\ \mathrm{days}$$

Question 12

Which of the following types of radiation has the highest energy?

Accepted Answer

$$\gamma-$$rays

Question 13

What is the product from the alpha decay of $$^{235}_{92}\mathrm{U}$$?

Accepted Answer

$$^{231}_{90}\mathrm{Th}$$

Question 14

Which process describes the splitting of a heavy nucleus into smaller nuclei, releasing a large amount of energy, as occurs when uranium-235 is bombarded with neutrons?

Accepted Answer

Fission

Question 15

A $$150.0\ \mathrm{g}$$ alloy requires $$59.3\ \mathrm{kJ} to $$raise its temperature from $$298\ \mathrm{K} to$$ $$398\ \mathrm{K}. $$What is the specific heat capacity of the alloy in $$\mathrm{J/g\ ^\circ C}$$?

Accepted Answer

$$3.95\ \mathrm{J/g\ ^\circ C}$$

Question 16

Which of the following best explains why radioisotopes used in diagnostic tests should have short half-lives?

Accepted Answer

To minimize the harmful side effects of the radiation

Question 17

Which of the following elements is NOT a metalloid or semimetal?

Accepted Answer

Aluminum (Al)

Question 18

A $$28\ \mathrm{mi/h}$$ automobile speed is to be converted to $$\mathrm{km/h}$$. ($$1\ \mathrm{km} = 0.6214\ \mathrm{mi}) $$What is the speed in $$\mathrm{km/h}$$, to the correct number of significant figures?

Accepted Answer

$$45\ \mathrm{km/h}$$

Question 19

Which of the following is a homogeneous mixture?

Accepted Answer

Air

Question 20

Which group contains only noble gases?

Accepted Answer

Kr, Xe, Rn

Exam #1 Practice Questions – Step-by-Step Study Guidance for GOB Chemistry

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