Q: Which of the following is the correct setup to convert 420 kg/hr to g/s?

$$420 \\ \times \\ \frac{1000}{1} \\ \times \\ \frac{1}{3600}$$

Q: Balance the following equation: $$C_2H_6 + O_2$ \\ \rightarrow CO_2$ + H_2O$$

$$2 C_2H_6 + 7 O_2$ \\ \rightarrow 4 CO_2$ + 6 H_2O$$

Q: Which of the following is the correct balanced equation for the combustion of methane?

$$CH_4 + 2$$ $$O_2$$ \\ \rightarrow $$CO_2 + 2 H_2O$

Question 1

A student measures the length of an object using a ruler and records it as 2.38 cm. How many significant figures are in this measurement?

Accepted Answer

3

Question 2

Which of the following is the correct setup to convert 420 kg/hr to g/s?

Accepted Answer

$$420 \ 	imes \ \frac{1000}{1} \ 	imes \ \frac{1}{3600}$$

Question 3

A 16.3 g solid is immersed in water. The volume of water rises from 43.6 mL to 45.2 mL. What is the density of the solid?

Accepted Answer

$$10.2 \ 	ext{g/cm}^3$$

Question 4

Which of the following correctly lists the number of protons, neutrons, and electrons in $$^{23}_{11}Na^+$$?

Accepted Answer

11 protons, 12 neutrons, 10 electrons

Question 5

Which of the following is the correct molecular formula for ethanol?

Accepted Answer

$$C_2H_5OH$$

Question 6

What is the percent by mass of nitrogen in $$NH_4NO_3$$? (Molar mass = 80 g/mol)

Accepted Answer

$$43.8\%$$

Question 7

Balance the following equation: $$C_2H_6 + O_2$ \ ightarrow CO_2$ + H_2O$$

Accepted Answer

$$2 C_2H_6 + 7 O_2$ \ ightarrow 4 CO_2$ + 6 H_2O$$

Question 8

A sample of gas has a volume of 2.0 L at 300 K. If the temperature is increased to 600 K at constant pressure, what is the new volume?

Accepted Answer

$$4.0 \ 	ext{L}$$

Question 9

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 10

Which of the following ions is isoelectronic with Ne?

Accepted Answer

$$F^-$$

Question 11

A 1.58 g sample of gas occupies 297 mL at 780 mm Hg and 30°C. What is the molar mass of the gas? ($$R = 0.0821 \ 	ext{L} \ 	ext{atm} \ 	ext{mol}^{-1} \ 	ext{K}^{-1})$$

Accepted Answer

$$44 \ 	ext{g/mol}$$

Question 12

Which of the following best describes the process of electron capture?

Accepted Answer

A nucleus absorbs an inner electron, converting a proton into a neutron.

Question 13

Which of the following is the correct electron configuration for $$Fe^{3+}$$?

Accepted Answer

$$[Ar] 3d^5$

Question 14

Which of the following statements about the periodic table is true?

Accepted Answer

Alkali metals are found in Group 1 and are highly reactive.

Question 15

Which of the following is the correct formula for copper(II) hydroxide?

Accepted Answer

$$Cu(OH)_2$$

Question 16

Which of the following best explains why gamma radiation does not change the mass or atomic number of a nucleus?

Accepted Answer

Gamma radiation consists of photons with no mass or charge.

Question 17

A sample of $$^{14}C$$ has an activity of 2.0 dps. If the half-life is 5730 years, what is the activity after 11,460 years?

Accepted Answer

$$0.5 \ 	ext{dps}$$

Question 18

Which of the following is the correct balanced equation for the combustion of methane?

Accepted Answer

$$CH_4 + 2$$ $$O_2$$ \ ightarrow $$CO_2 + 2 H_2O$

Question 19

Which of the following statements about Avogadro's number is correct?

Accepted Answer

It is the number of atoms in 1 mole of a substance.

Question 20

Which of the following is the correct formula for the empirical formula of a compound with 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass?

Accepted Answer

$$CH_2O$$

Comprehensive Study Notes for Honors Chemistry Midterm Exam Review

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