Q: A sample of gas at 1.00 atm and 273 K occupies 22.4 L. If the temperature is increased to 546 K at constant pressure, what will be the new volume?

$$V_2$$ = $$V_1$$ \times \frac{$$T_2$$}{$$T_1$$} = 22.4 \times \frac{546}{273} = 44.8$$ L

Q: What is the molar mass of ammonium sulfate, $$(NH_4$)_2SO_4$$?

$$2 \times 14.01 + 8 \times 1.01 + 32.07 + 4 \times 16.00 = 132.14 g/$$mol

Q: A balloon filled with helium gas at 1.00 atm and 300 K has a volume of 2.00 L. If the pressure is increased to 2.00 atm at constant temperature, what is the new volume?

$$V_2$$ = $$V_1$$ \times \frac{$$P_1$$}{$$P_2$$} = 2.00 \times \frac{1.00}{2.00} = 1.00$$ L

Question 1

A hospital pharmacist needs to convert a patient's weight from pounds to kilograms to calculate a medication dosage. If the patient weighs 154 lbs, what is their weight in kilograms? (1 lb = 0.454 kg)

Accepted Answer

$$154 	imes 0.454 = 69.8 kg$$

Question 2

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture in which the components are not evenly distributed, such as salad dressing

Question 3

Which of the following is the correct electron configuration for a neutral sulfur atom ($$Z=16$$)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^4$$

Question 4

A sample of gas at 1.00 atm and 273 K occupies 22.4 L. If the temperature is increased to 546 K at constant pressure, what will be the new volume?

Accepted Answer

$$V_2$$ = $$V_1$$ 	imes \frac{$$T_2$$}{$$T_1$$} = 22.4 	imes \frac{546}{273} = 44.8$$ L

Question 5

Which of the following statements about significant figures is correct?

Accepted Answer

All zeros to the right of the decimal point and after a nonzero digit are significant

Question 6

Which of the following is a physical change?

Accepted Answer

Melting ice to form liquid water

Question 7

What is the molar mass of ammonium sulfate, $$(NH_4$)_2SO_4$$?

Accepted Answer

$$2 	imes 14.01 + 8 	imes 1.01 + 32.07 + 4 	imes 16.00 = 132.14 g/$$mol

Question 8

Which of the following best explains why water is a polar molecule?

Accepted Answer

Oxygen is more electronegative than hydrogen, and the molecule has a bent shape

Question 9

A patient receives 500 mL of a saline solution containing 0.9% NaCl by mass. How many grams of NaCl did the patient receive?

Accepted Answer

$$500 	imes 0.009 = 4.5 g$$

Question 10

Which of the following compounds is named correctly according to IUPAC rules?

Accepted Answer

NaCl: sodium chloride

Question 11

Which of the following elements has the highest first ionization energy?

Accepted Answer

Neon ($$Ne)$$

Question 12

A chemical reaction is represented by the equation: $$2H_2 + O_2$ \rightarrow 2H_2O. If $$you start with 4 moles of $$H_2$$ and excess $$O_2$$, how many moles of $$H_2O$$ will be produced?

Accepted Answer

4 moles

Question 13

Which of the following best describes the VSEPR geometry of methane ($$CH_4$$)?

Accepted Answer

Tetrahedral

Question 14

Which of the following is the correct formula for calculating the pressure of a gas using Dalton's Law?

Accepted Answer

$$P_{total} = P_1$ + P_2$ + P_3$ + \ldots$$

Question 15

Which of the following is NOT a property of metals?

Accepted Answer

Brittleness

Question 16

A student mixes 50.0 mL of 0.200 M $$NaOH$$ with 50.0 mL of 0.200 M $$HCl. $$What is the final concentration of $$NaCl$$ formed?

Accepted Answer

$$0.200 M$

Question 17

Which of the following statements about ionic and covalent bonds is correct?

Accepted Answer

Ionic bonds involve the transfer of electrons, while covalent bonds involve sharing of electrons

Question 18

Which of the following is the correct formula for calculating density?

Accepted Answer

$$d = \frac{m}{V}$$

Question 19

A balloon filled with helium gas at 1.00 atm and 300 K has a volume of 2.00 L. If the pressure is increased to 2.00 atm at constant temperature, what is the new volume?

Accepted Answer

$$V_2$$ = $$V_1$$ 	imes \frac{$$P_1$$}{$$P_2$$} = 2.00 	imes \frac{1.00}{2.00} = 1.00$$ L

General Chemistry I: Midterm Study Guide (Chapters 1-5)

Guida di studio - Domande di pratica

Study guide - Flashcard