Question 1

Which of the following numbers is correctly written in scientific notation?

Accepted Answer

$$3.2 	imes 10$$^{-4}$$

Question 2

How many significant figures are in the measurement 0.04050 g?

Accepted Answer

4

Question 3

Calculate $$7.25 + 1.3$$ and round your answer according to the rules for significant figures in addition.

Accepted Answer

$$8.6$$

Question 4

Multiply $$3.45 	imes 0.60$$ and round your answer according to the rules for significant figures in multiplication.

Accepted Answer

$$2.07$$

Question 5

Convert $$4.2$$ kilometers to centimeters. (Use $$1 	ext{ km} = 1000 	ext{ m}$$ and $$1 	ext{ m} = 100 	ext{ cm})$$

Accepted Answer

$$420000 	ext{ cm}$$

Question 6

A patient receives a dose of $$2.5$$ miles worth of medication. Convert this distance to meters. (Use $$1 	ext{ mile} = 1.609 	ext{ km}$$ and $$1 	ext{ km} = 1000 	ext{ m})$$

Accepted Answer

$$4022.5 	ext{ m}$$

Question 7

A block has a mass of $$50 	ext{ g}$$ and a volume of $$10 	ext{ mL}. $$What is its density?

Accepted Answer

$$5 	ext{ g/mL}$$

Question 8

A liquid has a density of $$1.5 	ext{ g/mL}. $$What mass of liquid is present in $$8 	ext{ mL}$$?

Accepted Answer

$$12 	ext{ g}$$

Question 9

Convert $$37^{\circ}$$	ext{C}$$ (body temperature) to Kelvin using the formula T_K = T_C + 273.15$.

Accepted Answer

$$310.15 	ext{ K}$$

Question 10

How much heat ($$q) is $$required to raise the temperature of $$15 	ext{ g} of $$water by $$10^{\circ}$$	ext{C}$$? (Use C = 4.184$$ 	ext{ J/g}^{\circ}	ext{C}$$ and q = mC$$\Delta T$$)

Accepted Answer

$$627.6 	ext{ J}$$

Question 11

Which of the following is a chemical change?

Accepted Answer

Burning gasoline

Question 12

Which process is endothermic?

Accepted Answer

Melting ice

Question 13

How many neutrons are in an atom of magnesium-25? (Atomic number = 12)

Accepted Answer

13

Question 14

Which element forms a $$-2$$ ion most readily?

Accepted Answer

Oxygen

Question 15

Calculate the average atomic mass of an element with $$70\%$$ abundance at $$35 	ext{ amu}$$ and $$30\% at$$ $$37 	ext{ amu}.$$

Accepted Answer

$$35.6 	ext{ amu}$$

Question 16

What is the electron configuration for nitrogen ($$7$$ electrons)?

Accepted Answer

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

Question 17

Which noble gas shortcut represents the electron configuration for potassium?

Accepted Answer

$$[Ar] 4s^1$

Question 18

Which molecule is nonpolar due to its symmetrical shape?

Accepted Answer

CO$$_2$$

Question 19

Which compound is ionic?

Accepted Answer

NaCl

Question 20

What is the VSEPR shape of H$$_2O$$?

Accepted Answer

Bent

Introductory Chemistry: Essential Calculation and Concept Review

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