Q: A thermometer reads 99.2 °C. What is this temperature in Fahrenheit? Use $$^\circ F = (^\circ C \times 1.8) + 32. A$$) $$^\circ F = (99.2 \times 1.8) + 32 = 210.6 B$$) $$^\circ F = (99.2 + 32) / 1.8 = 73.0 C$$) $$^\circ F = (99.2 - 32) / 1.8 = 37.3 D$$) $$^\circ F = (99.2 \times 1.8) - 32 = 146.6$$

$$^\circ F = (99.2 \times 1.8) + 32 = 210.6$$

Question 1

Which of the following is an intensive property?

A) Mass
B) Volume
C) Density
D) Length

Accepted Answer

Density

Question 2

A student measures the mass of a coin as 5.01 g using a balance. If the true mass is 5.00 g, and repeated measurements yield 5.01 g, 5.02 g, and 5.00 g, which statement best describes the measurements?

A) Accurate but not precise
B) Precise but not accurate
C) Both accurate and precise
D) Neither accurate nor precise

Accepted Answer

Both accurate and precise

Question 3

Convert 40.00 °C to Kelvin using the correct formula.

A) $$K = 40.00 + 273.15 = 313.15
B$$) $$K = 40.00 - 273.15 = -233.15
C$$) $$K = (40.00 	imes 1.8) + 32
D$$) $$K = (40.00 - 32) / 1.8$$

Accepted Answer

$$K = 40.00 + 273.15 = 313.15$$

Question 4

A platinum ring has a mass of 3.15 g and displaces 0.233 cm$$^3 of $$water. Is the ring made of platinum? (Density of platinum = 21.4 g/cm$$^3)

A) $$Yes, because $$3.15 / 0.233 = 13.5 g/cm$^3
B) No$$, because $$3.15 / 0.233 = 13.5 g/cm$^3
C) $$Yes, because $$3.15 / 0.233 = 21.4 g/cm$^3
D) No$$, because $$3.15 / 0.233 = 21.4 g/cm$^3$$

Accepted Answer

No, because $$3.15 / 0.233 = 13.5 g/cm$^3$$

Question 5

Which glassware would you use to measure exactly 25.00 mL of a solution?

A) Beaker
B) Graduated cylinder
C) Volumetric flask
D) Erlenmeyer flask

Accepted Answer

Volumetric flask

Question 6

How many significant figures are in the measurement 0.04450 m?

A) 2
B) 3
C) 4
D) 5

Accepted Answer

4

Question 7

A thermometer reads 99.2 °C. What is this temperature in Fahrenheit? Use $$^\circ F = (^\circ C 	imes 1.8) + 32.

A$$) $$^\circ F = (99.2 	imes 1.8) + 32 = 210.6
B$$) $$^\circ F = (99.2 + 32) / 1.8 = 73.0
C$$) $$^\circ F = (99.2 - 32) / 1.8 = 37.3
D$$) $$^\circ F = (99.2 	imes 1.8) - 32 = 146.6$$

Accepted Answer

$$^\circ F = (99.2 	imes 1.8) + 32 = 210.6$$

Question 8

Which of the following is the correct SI base unit for luminous intensity?

A) Mole
B) Candela
C) Kelvin
D) Ampere

Accepted Answer

Candela

Question 9

A sample of jet fuel has a density of 0.768 g/cm$$^3. If a 747 is $$fueled with $$1.73 	imes 10^5$ L, what is the mass of the fuel in kilograms? (1$ L = 1000$ cm^3$)

A) 1.33$$ 	imes $$10^5 kg
B$$) $$1.33 	imes 10^8$ kg
C) 1.33$$ 	imes $$10^2 kg
D$$) $$1.33 	imes 10^4$ kg

Accepted Answer

$$1.33 	imes 10^5$ kg

Question 10

Which prefix multiplier represents $$10^{-9}$$?

A) milli
B) micro
C) nano
D) pico

Accepted Answer

nano

Question 11

A student adds $$2.345 + 0.07 + 2.9975. $$According to the rules for significant figures in addition, what is the correct answer?

A) $$5.4125
B$$) $$5.41
C$$) $$5.4
D$$) $$5.413$$

Accepted Answer

$$5.41$$

Question 12

Which of the following best describes the difference between accuracy and precision?

A) Accuracy is reproducibility; precision is closeness to the true value.
B) Accuracy is closeness to the true value; precision is reproducibility.
C) Both accuracy and precision mean the same thing.
D) Accuracy is only important in chemistry, not precision.

Accepted Answer

Accuracy is closeness to the true value; precision is reproducibility.

Question 13

A cylinder has a mass of 12.4 g, a length of 2.00 cm, and is made of aluminum (density = 2.70 g/cm$$^3). $$What is its radius? ($$V = \pi r^2$ l)

A$$) $$r = 1.00 cm
B$$) $$r = 0.85 cm
C$$) $$r = 0.76 cm
D$$) $$r = 2.00 cm$$

Accepted Answer

$$r = 0.76 cm$$

Question 14

Which of the following is an example of a derived unit?

A) Meter
B) Kilogram
C) Liter
D) Second

Accepted Answer

Liter

Question 15

A fishing boat spills 3.0 barrels of oil (1 barrel = 42 gallons) into the ocean. If the oil film is $$2.5 	imes 10^2$ nm thick, how many square meters will the oil slick cover? (1 gallon = 3.785 L, 1 L = 1000 cm^3$, 1 m^3$ = 10^6$ cm^3$, 1 nm = 10$$^{-9}$$ m)

A) 1.9$$ 	imes $$10^3 m$^2
B$$) $$1.9 	imes 10^6$ m^2$
C) 1.9$$ 	imes $$10^2 m$^2
D$$) $$1.9 	imes 10^4$ m^2$

Accepted Answer

$$1.9 	imes 10^3$ m^2$

Question 16

Which of the following numbers is ambiguous in terms of significant figures?

A) 1200
B) 1200.
C) 1.200 × 10$$^3
D) 1.2 × 10$^3$$

Accepted Answer

1200

Question 17

Which of the following is the correct conversion factor to convert from in$$^2 to cm$^2$$?

A) $$2.54 cm$$ $$= 1 in
B$$) $$6.45 cm$^2$$ $$= 1 in$^2
C$$) $$1 cm$^2$$ $$= 2.54 in$^2
D$$) $$1 in$^2$$ $$= 2.54 cm$^2$$

Accepted Answer

$$6.45 cm$^2$$ $$= 1 in$^2$$

Question 18

Which of the following is an exact number?

A) 1.000 × 10$$^5 s
B) 10 dm = 1 m
C) 0.04450 m
D) 5.0003 km$$

Accepted Answer

10 dm = 1 m

Matter, Measurement, and Problem Solving (Sections 1.6–1.8): Foundations of Chemical Quantification

Guida di studio - Domande di pratica

Study guide - Flashcard