Q: The density of gold at room temperature is $$19.3\ \text{g}\ \text{cm}^{-3}. $$What is its density in $$\text{kg}\ \text{m}^{-3}$$?

$$19,300\ \text{kg}\ \text{m}^{-3}$$

Q: Which of the following is a physical property?

Oxygen gas liquefies at $$90.6\ \text{K}$$ under normal pressure.

Question 1

Which of the following is a chemical property?

Accepted Answer

Carbon burns in oxygen gas.

Question 2

Which of the following pairs are isotopes?

Accepted Answer

$$\mathrm{H}_1^2$ and \mathrm{H}_1^3$

Question 3

A water sample from Bon Accord Dam in Tshwane has a surface area of $$315.0\ 	ext{km}^2$$ and an average depth of $$17.0\ 	ext{m}. It $$contains $$77.0\ 	ext{ng}\ 	ext{cm}^{-3} of Zn. $$What is the total mass (kg) of Zn in the dam?

Accepted Answer

$$412\ 	ext{kg}$$

Question 4

Which of the following is a pure substance?

Accepted Answer

Copper (II) oxide

Question 5

Convert $$25.86\ ^\circ	ext{C} to $$Kelvin.

Accepted Answer

$$298.01\ 	ext{K}$$

Question 6

Which of the following statements best describes the difference between accuracy and precision?

Accepted Answer

Accuracy is how close measurements are to the true value; precision is how close measurements are to each other.

Question 7

Which of the following is a derived SI unit?

Accepted Answer

Newton

Question 8

A cation $$Y^{2+} of $$element Y has $$45$$ nucleons and $$19$$ electrons. What is the identity of element Y?

Accepted Answer

Yttrium ($$\mathrm{Y})$$

Question 9

Which of the following is a correct chemical formula for the compound formed by aluminum and chlorine?

Accepted Answer

$$\mathrm{AlCl}_3$$

Question 10

Which of the following prefixes corresponds to $$10^{-12}$$?

Accepted Answer

pico

Question 11

The density of gold at room temperature is $$19.3\ 	ext{g}\ 	ext{cm}^{-3}. $$What is its density in $$	ext{kg}\ 	ext{m}^{-3}$$?

Accepted Answer

$$19,300\ 	ext{kg}\ 	ext{m}^{-3}$$

Question 12

Which of the following is a compound?

Accepted Answer

CO

Question 13

Which of the following is NOT a fundamental SI unit?

Accepted Answer

Newton

Question 14

Which of the following is a homogeneous mixture?

Accepted Answer

Air

Question 15

What is the correct chemical name for $$\mathrm{Fe}_2(\mathrm{CO}_3)_3$$?

Accepted Answer

Iron(III) carbonate

Question 16

Which of the following is a physical property?

Accepted Answer

Oxygen gas liquefies at $$90.6\ 	ext{K}$$ under normal pressure.

Question 17

Which of the following is the correct formula for magnesium hypochlorite?

Accepted Answer

$$\mathrm{Mg(ClO)_2}$$

Question 18

Which of the following is the correct symbol for gold?

Accepted Answer

Au

Question 19

Which of the following statements is true regarding mixtures?

Accepted Answer

A mixture can be homogeneous or heterogeneous.

Question 20

Which of the following is the correct formula for dinitrogen tetraoxide?

Accepted Answer

$$\mathrm{N}_2\mathrm{O}_4$$

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