Q: A nurse needs to convert $$45\ \mathrm{m/s} to$$ $$\mathrm{km/hr}$$ for a medical device. What is the correct conversion?

$$1.6 \times 10^2$\ \mathrm{km/hr}$$

Question 1

A hospital stores oxygen gas in high-pressure cylinders. Which physical property of gases allows them to be stored in this way, and what is the main reason this property is important for medical gas storage?

Accepted Answer

Gases are significantly compressible, allowing large amounts to be stored in small volumes.

Question 2

A student mixes sand, salt, and water in a beaker and stirs the mixture. Which of the following best describes the resulting mixture and why?

Accepted Answer

A heterogeneous mixture, because the sand does not dissolve and remains separate.

Question 3

Which of the following is an example of an intensive property, and why is it classified as such?

Accepted Answer

Temperature, because it does not depend on the amount of substance.

Question 4

A chemist finds a shiny, reddish metal and determines it is a pure substance. Which of the following is the best classification for this material?

Accepted Answer

An element

Question 5

According to the law of constant composition, which of the following statements is correct?

Accepted Answer

The composition of a compound is always the same, regardless of its source.

Question 6

A sample of gold has a mass of 33.3 g and a density of $$0.01932\ \mathrm{kg/cm^3$}. $$What is the volume of the gold sample in $$\mathrm{cm^3$}$$?

Accepted Answer

$$1.72\ \mathrm{cm^3$}$$

Question 7

A cube of an unknown metal has a side length of $$1.61\ \mathrm{mm}$$ and a mass of $$36\ \mathrm{mg}. $$Which metal is most likely the unknown, given the following densities: rhodium $$12.4\ \mathrm{g/cm^3$}$$, copper $$8.96\ \mathrm{g/cm^3$}$$, niobium $$8.57\ \mathrm{g/cm^3$}$$, vanadium $$6.11\ \mathrm{g/cm^3$}$$, zirconium $$6.51\ \mathrm{g/cm^3$}$$?

Accepted Answer

Niobium

Question 8

Which of the following numbers has the same number of significant figures as $$1.00310$$?

Accepted Answer

$$199.791$$

Question 9

A laboratory technician needs to convert $$3.337\ \mathrm{g/cm^3$} to$$ $$\mathrm{kg/m^3$}. $$What is the correct conversion?

Accepted Answer

$$3337\ \mathrm{kg/m^3$}$$

Question 10

A rectangular water tank is $$14.5\ \mathrm{cm}$$ long and $$4.63\ \mathrm{cm}$$ wide. If $$368.5\ \mathrm{g} of $$water completely fills the tank, what is the height of the tank in $$\mathrm{cm}$$? (Assume the density of water is $$1.000\ \mathrm{g/mL}.)$$

Accepted Answer

$$5.49\ \mathrm{cm}$$

Question 11

A room measures $$11.0\ \mathrm{ft} 	imes 11.0\ \mathrm{ft}$$ with a $$10.0\ \mathrm{ft}$$ ceiling. If the density of air at $$25\ ^\circ\mathrm{C} is$$ $$1.19\ \mathrm{g/L}$$, how many kilograms of air are in the room? ($$1\ \mathrm{in.} = 2.54\ \mathrm{cm}$$, $$1\ \mathrm{L} = 10^3$\ \mathrm{cm^3$})$$

Accepted Answer

$$40.8\ \mathrm{kg}$$

Question 12

Which of the following is true about the liter ($$\mathrm{L}$$)?

Accepted Answer

It is equivalent to a cubic decimeter.

Question 13

Which of the following is the correct abbreviation for the prefix mega-?

Accepted Answer

M

Question 14

A scientist needs to round $$229.613 to $$four significant figures and express the result in standard exponential notation. What is the correct answer?

Accepted Answer

$$2.296 	imes 10^2$

Question 15

Which of the following numbers contains no significant zeros?

Accepted Answer

$$0.00001$$

Question 16

A nurse needs to convert $$45\ \mathrm{m/s} to$$ $$\mathrm{km/hr}$$ for a medical device. What is the correct conversion?

Accepted Answer

$$1.6 	imes 10^2$\ \mathrm{km/hr}$$

Question 17

Which of the following is the chemical symbol for elemental sodium?

Accepted Answer

Na

Question 18

A student calculates $$(2.05631)(6.9391136) / 12.59326. $$What is the correct answer, reported to the proper number of significant figures?

Accepted Answer

$$1.13306$$

Question 19

Which of the following statements about expressing a number in scientific notation is correct?

Accepted Answer

It removes ambiguity as to the significant figures.

Question 20

A patient is prescribed a medication dosage of $$1\ \mathrm{kg}$$ per day. How many milligrams is this equivalent to?

Accepted Answer

$$1,000,000\ \mathrm{mg}$$

General Chemistry Chapter 1 Review – Guided Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard