Q: Which of the following is a correct example of dimensional analysis to convert $$5.0\ \mathrm{km} to$$ $$\mathrm{m}$$?

$$5.0\ \mathrm{km} \times \frac{1000\ \mathrm{m}}{1\ \mathrm{km}} = 5000\ \mathrm{m}$$

Question 1

A student measures the mass of a metal block as $$45.67\ \mathrm{g}$$ and its volume as $$16.2\ \mathrm{cm}^3. $$What is the density of the metal, reported to the correct number of significant figures?

Accepted Answer

$$2.82\ \mathrm{g/cm}^3$$

Question 2

Which of the following is an example of an extensive property?

Accepted Answer

Mass

Question 3

A solution is prepared by dissolving $$5.00\ \mathrm{g} of $$NaCl in $$100.0\ \mathrm{g} of $$water. Which of the following best describes the resulting mixture?

Accepted Answer

Homogeneous mixture

Question 4

Which of the following changes is a chemical change?

Accepted Answer

Rusting of iron

Question 5

A graduated cylinder is used to measure the volume of a liquid. The liquid level is between the $$21.0\ \mathrm{mL}$$ and $$22.0\ \mathrm{mL}$$ marks, closer to $$21.6\ \mathrm{mL}. $$What is the correct way to record this measurement?

Accepted Answer

$$21.60\ \mathrm{mL}$$

Question 6

Which of the following best describes the difference between physical and chemical properties?

Accepted Answer

Physical properties can be observed without changing the substance's identity, while chemical properties describe how a substance reacts to form new substances.

Question 7

Which of the following is the correct name for the compound $$\mathrm{FeCl}_3$$?

Accepted Answer

Iron(III) chloride

Question 8

A student needs to convert $$25.0\ \mathrm{cm}^3 to$$ $$\mathrm{mL}. $$Which of the following is the correct answer and conversion factor?

Accepted Answer

$$25.0\ \mathrm{mL}$$;\ 1\ \mathrm{cm}^3 = 1\ \mathrm{mL}$

Question 9

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture in which the composition is not uniform throughout

Question 10

Which of the following glassware is most appropriate for measuring $$25.00\ \mathrm{mL} of a $$solution with the highest precision?

Accepted Answer

Volumetric pipette

Question 11

A sample of gold has a mass of $$19.3\ \mathrm{g}$$ and a volume of $$1.00\ \mathrm{cm}^3. If $$the accepted density of gold is $$19.3\ \mathrm{g/cm}^3$$, what is the percent error in the student's measurement?

Accepted Answer

$$0\%$$

Question 12

Which of the following is a physical separation technique that can be used to separate a mixture of sand and salt?

Accepted Answer

Filtration

Question 13

Which of the following is an example of a chemical property?

Accepted Answer

Ability to react with oxygen

Question 14

Which of the following is a correct classification for oxygen ($$\mathrm{O}_2) at $$room temperature?

Accepted Answer

Element and gas

Question 15

A student records the following measurements for the mass of a sample: $$2.51\ \mathrm{g}$$, $$2.50\ \mathrm{g}$$, $$2.52\ \mathrm{g}$$, and $$2.51\ \mathrm{g}. $$The true mass is $$2.70\ \mathrm{g}. $$Which statement best describes the data?

Accepted Answer

The data are precise but not accurate.

Question 16

Which of the following is a correct example of dimensional analysis to convert $$5.0\ \mathrm{km} to$$ $$\mathrm{m}$$?

Accepted Answer

$$5.0\ \mathrm{km} 	imes \frac{1000\ \mathrm{m}}{1\ \mathrm{km}} = 5000\ \mathrm{m}$$

Question 17

Which of the following best describes the difference between a metal and a nonmetal?

Accepted Answer

Metals are good conductors of electricity, while nonmetals are poor conductors.

Question 18

Which of the following is the correct name for $$\mathrm{Na}_2\mathrm{SO}_4$$?

Accepted Answer

Sodium sulfate

Question 19

Which of the following best describes the phase of matter for bromine ($$\mathrm{Br}_2) at $$room temperature?

Accepted Answer

Liquid

Question 20

A sample of water is heated from $$25.0^\circ\mathrm{C} to$$ $$100.0^\circ\mathrm{C}. $$Which property of water changes during this process?

Accepted Answer

Temperature

General Chemistry I: Unit 1 Study Guide

Guida di studio - Domande di pratica

Study guide - Flashcard