Q: Which of the following is the correct formula for converting Celsius to Fahrenheit?

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

Question 1

Which of the following best describes a compound?

Accepted Answer

A substance composed of atoms from two or more different elements chemically bonded in a fixed ratio.

Question 2

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

Accepted Answer

Melting of ice to form liquid water.

Question 3

A sample of seawater is analyzed and found to have the same composition throughout. Which classification best fits this sample?

Accepted Answer

Homogeneous mixture (solution)

Question 4

Which of the following properties is intensive?

Accepted Answer

Density

Question 5

Which separation technique would be most appropriate to separate a mixture of sand and salt water?

Accepted Answer

Filtration

Question 6

A student measures the mass of a gold bar as 19.32 g and its volume as 1.00 cm$$^3. $$What is the density of gold in g/cm$$^3$$?

Accepted Answer

$$19.32\ \mathrm{g/cm^3$}$$

Question 7

Which of the following is a chemical property?

Accepted Answer

Flammability

Question 8

Convert $$25.0\ ^\circ\mathrm{C} to $$Kelvin.

Accepted Answer

$$298.2\ \mathrm{K}$$

Question 9

Which of the following is an example of an exact number?

Accepted Answer

The number of students in a classroom.

Question 10

A solution is prepared by dissolving table salt in water. Which term best describes the resulting mixture?

Accepted Answer

Homogeneous mixture

Question 11

Which of the following is the correct SI base unit for measuring the amount of substance?

Accepted Answer

Mole (mol)

Question 12

A runner has a mass of $$70.0\ \mathrm{kg}$$ and is moving at $$5.0\ \mathrm{m/s}. $$What is the kinetic energy of the runner in Joules?

Accepted Answer

$$875\ \mathrm{J}$$

Question 13

Which of the following statements about significant figures is correct?

Accepted Answer

Zeroes at the end of a number are significant if the number contains a decimal point.

Question 14

A sample of ethanol has a density of $$0.79\ \mathrm{g/cm^3$}. $$What is the mass of $$50.0\ \mathrm{mL} of $$ethanol? (Assume $$1\ \mathrm{mL} = 1\ \mathrm{cm^3$})$$

Accepted Answer

$$39.5\ \mathrm{g}$$

Question 15

Which of the following is NOT a base SI unit?

Accepted Answer

Liter (L)

Question 16

Which of the following best describes the Law of Constant Composition?

Accepted Answer

The relative number of atoms of each element in a compound is the same in any sample.

Question 17

A student needs to convert $$5.00\ \mathrm{km} to $$meters using dimensional analysis. Which conversion factor should be used?

Accepted Answer

$$1\ \mathrm{km} = 1000\ \mathrm{m}$$

Question 18

Which of the following is a heterogeneous mixture?

Accepted Answer

Granite

Question 19

Which of the following is the correct formula for converting Celsius to Fahrenheit?

Accepted Answer

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

Question 20

Which of the following is a derived SI unit?

Accepted Answer

Joule (J)

Chapter 1: Introduction to Matter, Energy, and Measurement – General Chemistry Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard