Question 1

Which of the following is the correct chemical formula for magnesium chloride?

Accepted Answer

$$\mathrm{$$MgCl_2$$}$$

Question 2

A student needs to prepare 250 mL of a 0.2 M NaCl solution. How many grams of NaCl (molar mass = 58.44 g/mol) are required?

Accepted Answer

$$2.92\ \mathrm{g}$$

Question 3

Which of the following best describes the process of converting between units in scientific calculations?

Accepted Answer

Using dimensional analysis to multiply by conversion factors so that units cancel appropriately.

Question 4

Which of the following is the correct name for the compound $$\mathrm{Fe_2O_3}$$?

Accepted Answer

Iron(III) oxide

Question 5

A laboratory experiment requires you to convert 45.0 mL to liters. What is the correct value in liters?

Accepted Answer

$$0.0450\ \mathrm{L}$$

Question 6

Which of the following statements about significant figures is correct?

Accepted Answer

When multiplying or dividing, the answer should have the same number of significant figures as the measurement with the fewest significant figures.

Question 7

A student is asked to balance the following chemical equation: $$\mathrm{C_2H_6 + O_2$ \rightarrow CO_2$ + H_2O}. $$What is the correct set of coefficients?

Accepted Answer

$$2, 7, 4, 6$$

Question 8

Which of the following best explains why safety goggles are required in the chemistry lab?

Accepted Answer

To protect your eyes from chemical splashes, broken glass, and other hazards.

Question 9

A student records the mass of a sample as 0.04560 g. How many significant figures are in this measurement?

Accepted Answer

5

Question 10

Which of the following is the correct formula for ammonium sulfate?

Accepted Answer

$$\mathrm{(NH_4$)_2SO_4}$$

Question 11

A solution is prepared by dissolving 10.0 g of glucose ($$\mathrm{C_6H_{12}O_6$}$$, molar mass = 180.16 g/mol) in enough water to make 0.250 L of solution. What is the molarity of the solution?

Accepted Answer

$$0.222\ \mathrm{M}$$

Question 12

Which of the following is a correct application of the periodic table to predict the chemical behavior of elements?

Accepted Answer

Elements in the same group have similar chemical properties because they have the same number of valence electrons.

Question 13

A student needs to convert 5.00 miles to kilometers. (1 mile = 1.609 km). What is the correct answer?

Accepted Answer

$$8.05\ \mathrm{km}$$

Question 14

Which of the following is the correct name for $$\mathrm{Na_2CO_3}$$?

Accepted Answer

Sodium carbonate

Question 15

A student is asked to solve the following problem: 'How many moles are in 25.0 g of $$\mathrm{H_2O}$$?' (Molar mass of $$\mathrm{H_2O} = 18.02 g/$$mol)

Accepted Answer

$$1.39\ \mathrm{mol}$$

Question 16

Which of the following best describes a hypothesis in the scientific method?

Accepted Answer

A testable statement or prediction that can be investigated by experimentation.

Question 17

A student is asked to convert 300 K to degrees Celsius. What is the correct answer?

Accepted Answer

$$26.85^\circ \mathrm{C}$$

Question 18

Which of the following is the correct chemical formula for dinitrogen pentoxide?

Accepted Answer

$$\mathrm{N_2O_5}$$

Question 19

A student is asked to describe the difference between a physical and a chemical change. Which of the following is a chemical change?

Accepted Answer

Iron rusting in the presence of oxygen

Question 20

A student mixes 50.0 mL of 1.00 M HCl with 50.0 mL of 1.00 M NaOH. What is the concentration of NaCl in the resulting 100.0 mL solution, assuming complete neutralization?

Accepted Answer

$$0.50\ \mathrm{M}$$

Introduction to Chemistry Syllabus and Course Expectations

Guida di studio - Domande di pratica

Study guide - Flashcard