Q: The average distance from Earth to the Moon is $$384\ \mathrm{Mm}. $$Express this distance in centimeters using scientific notation.

$$3.84 \times 10$$^{10}$$\ \mathrm{cm}$$

Question 1

A laboratory thermometer reads $$36.5\ ^\circ\mathrm{C}$$ for a patient's temperature. What is this temperature in Kelvin? Use the formula $$K = ^\circ\mathrm{C} + 273.15.$$

Accepted Answer

$$309.65\ \mathrm{K}$$

Question 2

A sample of gold is heated from $$25.0\ ^\circ\mathrm{C} to$$ $$43.3\ ^\circ\mathrm{C} by $$absorbing $$200\ \mathrm{J} of $$heat. If the specific heat of gold is $$0.13\ \mathrm{J/g}^\circ\mathrm{C}$$, what is the mass of the gold sample? Use $$q = m c \Delta T.$$

Accepted Answer

$$84.1\ \mathrm{g}$$

Question 3

Which of the following best describes the classification of a smoothie made by blending various fruits and vegetables, resulting in a brown frothy suspension that settles over time?

Accepted Answer

a heterogeneous mixture

Question 4

A Silver-108 isotope is represented as $$^{108}_{47}\mathrm{Ag}. $$How many protons and neutrons does it contain?

Accepted Answer

47 protons and 61 neutrons

Question 5

The average distance from Earth to the Moon is $$384\ \mathrm{Mm}. $$Express this distance in centimeters using scientific notation.

Accepted Answer

$$3.84 	imes 10$$^{10}$$\ \mathrm{cm}$$

Question 6

A radioactive sample of Phosphorus-32 ($$^{32}\mathrm{P}) is $$used in leukemia treatment. If its half-life is $$14.3$$ days, what fraction of the original sample remains after $$57.2$$ days? Use the formula $$n = \frac{t}{t_{1/2}}$$ and $$	ext{fraction remaining} = \left(\frac{1}{2}ight)^n.$$

Accepted Answer

$$0.0625$$

Question 7

Which of the following is a chemical property of iodine ($$\mathrm{I}_2$$)?

Accepted Answer

It combines with sodium metal to form sodium iodide.

Question 8

Which of the following nuclear reactions represents electron capture?

Accepted Answer

$$^{204}_{84}\mathrm{Po} $$+ ^{0}$$_{-1}\mathrm{e} \$$rightarrow ^{204}$$_{83}\mathrm{Bi}$$

Question 9

A piece of osmium has a volume of $$14.5\ \mathrm{cm}^3$$ and a density of $$22.6\ \mathrm{g/cm}^3. $$What is its mass? Use $$	ext{mass} = 	ext{density} 	imes 	ext{volume}.$$

Accepted Answer

$$328\ \mathrm{g}$$

Question 10

Which of the following compounds is classified as a molecular compound?

Accepted Answer

$$\mathrm{PBr}_3$$

Question 11

A patient is exposed to a form of radiation that can be stopped by skin but is extremely dangerous if inhaled. Which type of radiation is this?

Accepted Answer

alpha particles

Question 12

Which element would be expected to have nearly identical chemical properties as chlorine?

Accepted Answer

fluorine

Question 13

What is the systematic name for the ionic compound with the formula $$\mathrm{Ni}_3\mathrm{P}_2$$?

Accepted Answer

Nickel(II) phosphide

Question 14

A neutral silicon atom has how many valence electrons?

Accepted Answer

4

Question 15

Which metric prefix corresponds to a power of $$10^{-15}$$?

Accepted Answer

femto

Question 16

What is the formula for the ionic compound formed from $$\mathrm{Co}^{3+}$$ and $$\mathrm{SO}_4$$^{2-}$$ ions?

Accepted Answer

$$\mathrm{Co}_2(\mathrm{SO}_4)_3$$

Question 17

A sample contains $$3,055,000,000$$ base pairs. How is this number correctly written in scientific notation?

Accepted Answer

$$3.055 	imes 10^9$

Question 18

Which of the following ions has a $$1+$$ charge?

Accepted Answer

ammonium ion

Question 19

Which element from the list below is considered a non-metal?

Accepted Answer

bromine

Question 20

Which of the following best describes the position of phosphorus on the periodic table?

Accepted Answer

It is a 3rd period, pnicogen.

CHEM 1120 Exam 1 Study Guidance – GOB Chemistry Concepts and Problem Solving

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