Q: A patient needs 900. cc of medication at a drip rate of 2 drops/sec. If there are 20 drops per mL, how many minutes will it take to administer the medication?

$$\frac{900 \text{ mL} \times 20 \text{ drops/mL}}{2 \text{ drops/sec}} \div 60 = 150$$ min

Q: A meal contains 10 g of fat and 30 g of carbohydrates. How many Calories does it provide? (Fat: $$9 \text{ kcal/g}$$, Carbohydrate: $$4 \text{ kcal/g})$$

$$10 \times 9 + 30 \times 4 = 90 + 120 = 210$$ Cal

Q: A 25.0 g copper coin at 10.0$$^\circC is $$placed into 10.0 g of water at 75.0$$^\circC. $$After five minutes, the water temperature is 55.6$$^\circC. If $$the specific heat of water is 1.00 cal/g·$$^\circC$$, how much energy did the water lose?

$$Q = 10.0 \times 1.00 \times (55.6 - 75.0) = -194$$ cal

Q: Which of the following is the correct nuclear equation for the alpha decay of $$^{238}_{92}\text{U}$$?

$$^{238}_{92}\text{U} \$$rightarrow ^{234}$$_{90}\text{Th} $$+ ^{4}$$_{2}\text{He}$$

Question 1

Which of the following best describes the difference between carbon monoxide (CO) and carbon dioxide (CO$$_2) $$molecules as shown in the images?

Accepted Answer

CO contains one carbon atom and one oxygen atom, while CO$$_2$$ contains one carbon atom and two oxygen atoms.

Question 2

A student measures the mass of a zinc object as 68.60 g and finds that it increases the water level in a graduated cylinder from 35.5 mL to 45.0 mL. What is the density of the zinc object in g/mL?

Accepted Answer

$$\frac{68.60}{9.5} = 7.22 g/mL$$

Question 3

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

Accepted Answer

Evaporating gasoline

Question 4

A patient needs 900. cc of medication at a drip rate of 2 drops/sec. If there are 20 drops per mL, how many minutes will it take to administer the medication?

Accepted Answer

$$\frac{900 	ext{ mL} 	imes 20 	ext{ drops/mL}}{2 	ext{ drops/sec}} \div 60 = 150$$ min

Question 5

Which of the following statements about significant figures is correct?

Accepted Answer

Zeros to the right of a number with a decimal point are significant.

Question 6

Convert 69.00 $$^\circF to$$ $$^\circC $$using the formula $$^\circF$$ = $$1.8 	imes ^\circC + 32$. What is the answer?

Accepted Answer

$$^\circC$$ = \frac{69.00 - 32}{1.8} = 20.6^\circ$C

Question 7

Which of the following is a heterogeneous mixture?

Accepted Answer

Water and copper

Question 8

Which of the following is an exact number?

Accepted Answer

The number of students in a classroom

Question 9

A meal contains 10 g of fat and 30 g of carbohydrates. How many Calories does it provide? (Fat: $$9 	ext{ kcal/g}$$, Carbohydrate: $$4 	ext{ kcal/g})$$

Accepted Answer

$$10 	imes 9 + 30 	imes 4 = 90 + 120 = 210$$ Cal

Question 10

Which of the following is the correct scientific notation for 0.000665?

Accepted Answer

$$6.65 	imes 10$$^{-7}$$

Question 11

Which of the following is a chemical property?

Accepted Answer

Sugar ferments to form alcohol

Question 12

Which of the following is the correct formula for the sulfate ion?

Accepted Answer

$$	ext{SO}_4$$^{2-}$$

Question 13

Which of the following best describes the Law of Conservation of Energy?

Accepted Answer

Energy can only be transferred or transformed, not created or destroyed.

Question 14

A 25.0 g copper coin at 10.0$$^\circC is $$placed into 10.0 g of water at 75.0$$^\circC. $$After five minutes, the water temperature is 55.6$$^\circC. If $$the specific heat of water is 1.00 cal/g·$$^\circC$$, how much energy did the water lose?

Accepted Answer

$$Q = 10.0 	imes 1.00 	imes (55.6 - 75.0) = -194$$ cal

Question 15

Which of the following is a property of metals?

Accepted Answer

High luster

Question 16

Which of the following is the correct nuclear equation for the alpha decay of $$^{238}_{92}	ext{U}$$?

Accepted Answer

$$^{238}_{92}	ext{U} \$$rightarrow ^{234}$$_{90}	ext{Th} $$+ ^{4}$$_{2}	ext{He}$$

Question 17

How many significant figures are in the measurement 0.09830?

Accepted Answer

5

Question 18

Which of the following is the correct conversion factor for converting nanometers (nm) to meters (m)?

Accepted Answer

$$1 	ext{ nm} = 10$$^{-9}$$ 	ext{ m}$$

Chemistry Fundamentals: Matter, Measurements, Atomic Structure, and Nuclear Chemistry

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