Question 1

Which of the following is a correct metric conversion for 2.5 milligrams to micrograms?

Accepted Answer

$$2.5 	imes 10^3$ micrograms

Question 2

A solution of salt water (NaCl) in water contains 2.39 g of NaCl per 100 g of solution. If the density of the solution is $$1.0 	ext{ g/mL}$$, what is the volume of solution containing $$8.5$$ moles of NaCl? (Molar mass of NaCl = $$58.5 	ext{ g/mol})$$

Accepted Answer

$$2080 mL$$

Question 3

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture with fixed and uniform composition

Question 4

Convert $$21.5^\circ 	ext{C} to $$Kelvin.

Accepted Answer

$$294.7 K$$

Question 5

A pound of food contains $$10.5$$ cups. If a German shepherd eats $$5$$ cups of dog food a day, how many pounds of food does it eat in a week?

Accepted Answer

$$3.33$$ pounds

Question 6

Which of the following is a pure substance?

Accepted Answer

Glucose ($$C_6H_{12}O_6$)

Question 7

If the temperature change in an exothermic reaction is $$11.9^\circ 	ext{C}$$, what is the temperature change in $$^\circ 	ext{F}$$?

Accepted Answer

$$21.4^\circ 	ext{F}$$

Question 8

How many cubic centimeters are in $$1$$ cubic meter?

Accepted Answer

$$1 	imes 10^6$ cm^3$

Question 9

A sample of mercury ($$Hg) $$contains $$6.0 	imes 10$$^{23}$$ atoms and has a mass of 201$ grams. What is the volume of this sample if mercury's density is 13.6$ g/cm^3$?

Accepted Answer

$$14.8 cm$^3$$

Question 10

Which of the following has a fixed composition?

Accepted Answer

Elements and compounds

Question 11

Convert $$125^\circ 	ext{C} to$$ $$^\circ 	ext{F}.$$

Accepted Answer

$$257^\circ 	ext{F}$$

Question 12

A student health center needs to vaccinate $$1,555$$ students. Each vaccine requires $$10.0 mL of $$serum. Will $$17.3$$ quarts of serum be enough to vaccinate all the students? ($$1$$ quart $$= 946 mL)$$

Accepted Answer

No, there will not be enough serum

Question 13

Which of the following best explains why $$C_3H_8 ($$propane) is a pure substance and not a mixture?

Accepted Answer

It has a fixed composition with a specific ratio of carbon to hydrogen atoms

Question 14

If the average US farm encompasses $$434$$ acres, how many square miles is this? ($$1 km$^2 = 247$$ acres, $$1 km$^2 = 0.6214$$ miles$$^2)$$

Accepted Answer

$$1.09$$ miles$$^2$$

Question 15

Which of the following is NOT a pure substance?

Accepted Answer

Koolaid

Question 16

A wood wheel has a density of $$0.59 g/cm$^3$$ and a mass of $$9.5$$ pounds. What is its volume in cm$$^3$$? ($$1 lb$$ = $$453.6 g)$$

Accepted Answer

$$7,300 cm$^3$$

Question 17

Which of the following best describes a mixture with the same composition throughout?

Accepted Answer

Homogeneous mixture

Question 18

If the temperature of the atmosphere falls by $$25.6^\circ 	ext{F}$$, what is the temperature change in $$^\circ 	ext{C}$$?

Accepted Answer

$$-14.2^\circ 	ext{C}$$

Question 19

Which of the following is a compound?

Accepted Answer

Table salt (NaCl)

Question 20

A French student has $$550$$ German marks and wants to change them into French francs. If a franc equals $$0.185$$ dollars, and $$0.49$$ dollars equals $$1.41$$ German marks, does she have enough money to spend the night in a hotel that costs $$146$$ francs per day?

Accepted Answer

No, she does not have enough francs

General Chemistry Study Notes: Measurement, Conversions, Significant Figures, and Classification of Matter

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