Q: Which of the following is the correct balanced equation for the combustion of methane ($$CH_4$$)?

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

Question 1

Which of the following best describes the primary goal of scientific inquiry in CHEM-101 as outlined in the syllabus?

Accepted Answer

To develop the scientific method of inquiry through the acquisition of scientific knowledge.

Question 2

A student is asked to convert 25.0 grams of NaCl to moles. Which formula should they use?

Accepted Answer

$$n = \frac{m}{M}$$

Question 3

During a laboratory experiment, a student needs to measure the mass of a sample accurately. Which piece of equipment should they use according to the course objectives?

Accepted Answer

Triple beam balance

Question 4

Which of the following is a correct application of the rules for significant figures when adding 12.34 g and 0.6 g?

Accepted Answer

$$12.9 g$$

Question 5

A student is asked to write the correct chemical formula for calcium phosphate. Which is correct?

Accepted Answer

$$Ca_3$$($$PO_4)_2$

Question 6

Which of the following best explains why it is important to balance chemical equations?

Accepted Answer

To satisfy the law of conservation of mass.

Question 7

A gas occupies a volume of 2.0 L at a pressure of 1.0 atm. If the pressure is increased to 2.0 atm at constant temperature, what is the new volume?

Accepted Answer

$$1.0 L$$

Question 8

Which of the following statements about acids and bases is correct according to the Brønsted-Lowry theory?

Accepted Answer

An acid is a substance that donates a proton ($$H^+).$$

Question 9

Which of the following is the correct electron configuration for a neutral atom of sodium ($$Na$$)?

Accepted Answer

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

Question 10

A solution is prepared by dissolving 5.0 g of glucose ($$C_6H_{12}O_6$) in enough water to make 100 mL of solution. What is the molarity of the solution? (Molar mass of C_6H$$_{12}$$O_6 = 180$ g/mol)

Accepted Answer

$$0.28 M$$

Question 11

Which of the following best describes the relationship between temperature and the kinetic energy of gas particles?

Accepted Answer

As temperature increases, the kinetic energy of gas particles increases.

Question 12

A student is asked to predict the type of bond formed between sodium and chlorine. Which is correct?

Accepted Answer

Ionic bond

Question 13

Which of the following is a correct statement about isotopes?

Accepted Answer

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

Question 14

A chemical reaction is exothermic if:

Accepted Answer

It releases heat to the surroundings.

Question 15

Which of the following is the correct balanced equation for the combustion of methane ($$CH_4$$)?

Accepted Answer

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

Question 16

A buffer solution is important in biological systems because it:

Accepted Answer

Maintains a relatively constant pH.

Question 17

Which of the following is a correct statement about the periodic table?

Accepted Answer

Elements in the same group have similar chemical properties.

Question 18

A student mixes 50 mL of 1.0 M $$HCl$$ with 50 mL of 1.0 M $$NaOH. $$What is the pH of the resulting solution?

Accepted Answer

pH = 7

Question 19

Which of the following best describes the role of a catalyst in a chemical reaction?

Accepted Answer

It decreases the activation energy.

Question 20

A radioactive isotope decays with a half-life of 10 days. If you start with 80 g, how much remains after 30 days?

Accepted Answer

$$10 g$$

CHEM-101: College Chemistry I – Structured Study Notes for GOB Chemistry Students

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