Q: A student needs to convert $250.0\ ^\circ\mathrm{F}$ to Celsius. Which formula should they use, and what is the result?

Use $^\circ\mathrm{C} = (^\circ\mathrm{F} - 32) \times \frac{5}{9}$; result is $121.1\ ^\circ\mathrm{C}$

Question 1

A sample of water is heated from 25.0 °C to 77.0 °C. What is the temperature change in Kelvin?

Accepted Answer

$52.0\ K$

Question 2

Which of the following statements best describes the Law of Multiple Proportions?

Accepted Answer

Elements combine in small whole-number ratios to form compounds.

Question 3

A student records the mass of a sample as 0.0500 g. How many significant figures are in this measurement?

Accepted Answer

4

Question 4

Which of the following elements is a diatomic molecule in its natural state?

Accepted Answer

Nitrogen

Question 5

A block of wood (density $0.54\ \mathrm{g/mL}$) is placed in a beaker containing acetone (density $0.79\ \mathrm{g/mL}$) and water (density $1.00\ \mathrm{g/mL}$). Where will the wood settle?

Accepted Answer

It will float on top of both acetone and water.

Question 6

Which of the following is the correct formula for iron (II) phosphide?

Accepted Answer

$\mathrm{Fe}_3\mathrm{P}_2$

Question 7

A sample contains $3.01 	imes 10^{23}$ molecules of CO$_2$. How many moles of CO$_2$ are present?

Accepted Answer

$0.500\ \mathrm{mol}$

Question 8

Which of the following best describes an isotope?

Accepted Answer

Atoms with the same number of protons but different numbers of neutrons.

Question 9

What is the name of the compound $\mathrm{CuSO}_4 \cdot 5\mathrm{H}_2\mathrm{O}$?

Accepted Answer

Copper (II) sulfate pentahydrate

Question 10

A student needs to convert $250.0\ ^\circ\mathrm{F}$ to Celsius. Which formula should they use, and what is the result?

Accepted Answer

Use $^\circ\mathrm{C} = (^\circ\mathrm{F} - 32) 	imes \frac{5}{9}$; result is $121.1\ ^\circ\mathrm{C}$

Question 11

Which of the following is a property of metals?

Accepted Answer

They are malleable and conduct electricity.

Question 12

How many electrons are present in a $\mathrm{N}^{3-}$ ion?

Accepted Answer

10

Question 13

Which of the following compounds is covalent?

Accepted Answer

$\mathrm{NF}_5$

Question 14

A sample of a compound contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is the empirical formula?

Accepted Answer

$\mathrm{CH}_2\mathrm{O}$

Question 15

Which group on the periodic table contains the noble gases?

Accepted Answer

Group 18

Question 16

What is the molar mass of $\mathrm{NH}_4^+$ (ammonium ion)? (N = 14.0, H = 1.0)

Accepted Answer

$18.0\ \mathrm{g/mol}$

Question 17

Which of the following is the correct name for $\mathrm{K}_2\mathrm{SO}_4$?

Accepted Answer

Potassium sulfate

Question 18

A sample of osmium (density $22.4\ \mathrm{g/mL}$) and neoprene rubber (density $1.33\ \mathrm{g/mL}$) are placed in water. What is the correct order from top to bottom?

Accepted Answer

Water, neoprene rubber, osmium

Question 19

Which of the following is the correct formula for a compound formed between barium and nitrate?

Accepted Answer

$\mathrm{Ba(NO}_3)_2$

Question 20

A chemist has 0.250 mol of glucose ($\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6$). How many molecules does this represent?

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