Q: Which of the following is a correct conversion factor for the equality $$1\,\text{kg} = 1000\,\text{g}$$?

$$\frac{1\,\text{kg}}{1000\,\text{g}}$$

Q: Which of the following is the correct equality for converting meters to centimeters?

$$1\,\text{m} = 100\,\text{cm}$$

Question 1

Which of the following best describes a chemical change?

Accepted Answer

A process in which a substance is converted into one or more new substances with different formulas and properties.

Question 2

Which of the following observations is NOT typically evidence of a chemical change?

Accepted Answer

Melting of ice.

Question 3

What is the correct balanced chemical equation for the reaction of aluminum with sulfur to form aluminum sulfide?

Accepted Answer

$$2Al(s) + 3S(s) \rightarrow Al_2S_3(s)$$

Question 4

Which type of reaction is represented by the following equation? $$2HgO(s) \rightarrow 2Hg(l) + O_2$(g)$$

Accepted Answer

Decomposition

Question 5

In the reaction $$2Zn(s) + 2HCl(aq) \rightarrow $$ZnCl_2$$(aq) + H_2$(g)$$, which element is oxidized?

Accepted Answer

Zn

Question 6

Which of the following is a correct conversion factor for the equality $$1\,	ext{kg} = 1000\,	ext{g}$$?

Accepted Answer

$$\frac{1\,	ext{kg}}{1000\,	ext{g}}$$

Question 7

A doctor's order prescribes 0.150 mg of Synthroid. If tablets contain 75 mcg of Synthroid, how many tablets are required to provide the prescribed medication?

Accepted Answer

2 tablets

Question 8

Which of the following best describes a combustion reaction?

Accepted Answer

A carbon-containing compound burns in oxygen to form $$CO_2$$ and $$H_2O$$, releasing energy.

Question 9

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

Accepted Answer

$$CH_4(g) + 2O_2(g$$) \rightarrow $$CO_2(g) + 2H_2O(g$$)$$

Question 10

Which of the following statements about oxidation and reduction is TRUE?

Accepted Answer

Oxidation involves the loss of electrons, while reduction involves the gain of electrons.

Question 11

A sample of methyl alcohol ($$CH_3OH) is $$metabolized in the body according to the following reaction: $$CH_3OH \rightarrow H_2CO + 2H. $$What type of reaction is this?

Accepted Answer

Oxidation (loss of hydrogen atoms)

Question 12

Which of the following is a double replacement reaction?

Accepted Answer

$$AgNO_3(aq) + $$NaCl(aq) \rightarrow AgCl(s) + $$NaNO_3(aq$$)$$

Question 13

If a person weighs 164 lb, what is their mass in kilograms? (Use $$1\,	ext{kg} = 2.20\,	ext{lb})$$

Accepted Answer

74.5 kg

Question 14

Which of the following is the correct equality for converting meters to centimeters?

Accepted Answer

$$1\,	ext{m} = 100\,	ext{cm}$$

Question 15

Which of the following is the correct classification for the reaction $$2Na(s) + Cl_2$(g) \rightarrow 2NaCl(s)$$?

Accepted Answer

Combination

Question 16

A solution contains 18% body fat by mass. How many grams of fat are present in a 70 g sample?

Accepted Answer

12.6 g

Question 17

Which of the following is a correct statement about the LD$$_{50}$$ value of a substance?

Accepted Answer

A lower LD$$_{50}$$ value indicates a more toxic substance.

Question 18

Which of the following is the correct conversion factor for the equality $$1\,	ext{mg} = 1000\,\mu	ext{g}$$?

Accepted Answer

$$\frac{1\,	ext{mg}}{1000\,\mu	ext{g}}$$

Question 19

Which of the following is a correct description of a single replacement reaction?

Accepted Answer

One element replaces another element in a compound.

Chemical Reactions, Equations, and Metric Conversions in GOB Chemistry

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