Q: A cable is $$8.84 \times 10^3$ \ \mathrm{km}$$ long and consists of 6 strands, each with a mass of $$1.19 \times 10$$^{-3}$$ \ \mathrm{lb/m}. $$What is the total mass of the cable in kilograms? ($$1 \ \mathrm{lb} = 0.4536 \ \mathrm{kg})$$

$$2.86 \times 10^4$ \ \mathrm{kg}$$

Question 1

Which of the following best describes a chemical property of copper?

Accepted Answer

Copper reacts with nitric acid to form a blue solution.

Question 2

A student heats a sample of water from $$20^\circ \mathrm{C} to$$ $$100^\circ \mathrm{C}. $$Which of the following best describes this process?

Accepted Answer

A physical change, because only the state or temperature changes.

Question 3

Which of the following is NOT a sign that a chemical reaction has occurred?

Accepted Answer

A change in physical state, such as melting.

Question 4

A graduated cylinder contains $$19.9 \ \mathrm{mL} of $$water. After a metal sample is added, the volume rises to $$24.5 \ \mathrm{mL}. $$What is the volume of the metal in $$\mathrm{cm^3$}$$?

Accepted Answer

$$4.6 \ \mathrm{cm^3$}$$

Question 5

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Sand and iron filings

Question 6

Convert $$38.7^\circ \mathrm{C} to $$Kelvin.

Accepted Answer

$$311.8 \ \mathrm{K}$$

Question 7

Which of the following statements about significant figures is TRUE?

Accepted Answer

All nonzero digits are significant.

Question 8

A student measures the mass of a sample four times and gets values very close to each other, but far from the true value. This is an example of:

Accepted Answer

Low accuracy, high precision

Question 9

Which of the following is an exact number?

Accepted Answer

$$1 \ \mathrm{ft} = 12 \ \mathrm{in}$$

Question 10

A slab of lithium weighs $$1.49 	imes 10^3$ \ \mathrm{mg}$$ and has dimensions $$20.9 \ \mathrm{mm} 	imes 11.1 \ \mathrm{mm} 	imes 11.9 \ \mathrm{mm}. $$What is its density in $$\mathrm{g/cm^3$}$$? (Use $$10 \ \mathrm{mm} = 1 \ \mathrm{cm}$$ and $$1000 \ \mathrm{mg} = 1 \ \mathrm{g})$$

Accepted Answer

$$0.540 \ \mathrm{g/cm^3$}$$

Question 11

Which of the following is the correct SI base unit for temperature?

Accepted Answer

Kelvin ($$\mathrm{K})$$

Question 12

A cable is $$8.84 	imes 10^3$ \ \mathrm{km}$$ long and consists of 6 strands, each with a mass of $$1.19 	imes 10$$^{-3}$$ \ \mathrm{lb/m}. $$What is the total mass of the cable in kilograms? ($$1 \ \mathrm{lb} = 0.4536 \ \mathrm{kg})$$

Accepted Answer

$$2.86 	imes 10^4$ \ \mathrm{kg}$$

Question 13

Which of the following is the correct formula to convert Celsius to Fahrenheit?

Accepted Answer

$$T(^\circ \mathrm{F}) = \dfrac{9}{5} T(^\circ \mathrm{C}) + 32$$

Question 14

Which of the following prefixes represents $$10^{-6}$$?

Accepted Answer

micro

Question 15

A measurement is recorded as $$0.0030 \ \mathrm{L}. $$How many significant figures does this value have?

Accepted Answer

2

Question 16

Which of the following best describes the scientific method?

Accepted Answer

A systematic approach involving observation, hypothesis, experiment, and theory.

Question 17

Which of the following is a physical property?

Accepted Answer

Melting point

Question 18

A student adds $$83.5 \ \mathrm{mL}$$ and $$23.28 \ \mathrm{mL} of $$liquid. What is the sum, rounded to the correct number of decimal places?

Accepted Answer

$$106.8 \ \mathrm{mL}$$

Question 19

Which of the following best describes a systematic error?

Accepted Answer

All measurements are consistently higher or lower than the true value.

Chapter 1: Keys to the Study of Chemistry – Matter, Measurement, and Problem Solving

Guida di studio - Domande di pratica

Study guide - Flashcard