Workshop Jeopardy

Polyatomic Ions

100

What is the name of NO₃^-

Nitrate

200

What is the name of OH^-

Hydroxide

300

What is the name of PO₄^3-

Phosphate

400

What is the name of ClO₄^-

Perchlorate

500

What is the name of H₂PO₄^-

Dihydrogen Phosphate

Sig Figs

100

Round the following number to three significant figures:
4.567

4.57

200

How many significant figures are in the following measurement?
0.00780

3 Sig Figs

300

Perform the following calculation and express your answer with the correct number of significant figures:
5.23 × 2.1

11 (Rounded to 2 sig figs)

400

Add the following numbers and give the answer with the correct number of significant figures:
12.11 + 0.034 + 5.6

17.7

500

Divide the following numbers and express the answer with the correct number of significant figures:
0.00456 ÷ 1.23

 0.00371

Solubility

100

If I dissolve salt in water, what is the solute?

Salt

200

A sugar cube completely dissolves when added to a cup of coffee. Is this saturated or unsaturated?

unsaturated

300

A student mixes 50 grams of potassium nitrate KNO₃ in 100 mL of water at 25°C. The solubility of potassium nitrate in water at 25°C is 38 grams per 100 mL of water.

• Only 38 grams of KNO₃ will dissolve.
• 12 grams will remain undissolved.

400

At 40 °C, the solubility of  KNO₃ is 65 g/100. g of  H₂O. How many grams of  KNO₃ will dissolve in 120 g of  H₂O at  40°C?

78g of KNO₃

500

At 40 °C, the solubility of  KNO₃ is 65 g/100. g of  H₂O. How many grams of  H₂O are needed to completely dissolve 110 g of  KNO‍‍₃ at  40°C?

170g of H₂O

Combined Gas Law

100

What is the Combined Gas Law?

P1⋅V1/T1=P2⋅V2/T2 or pressure and volume are in which they are related to each other, and that they are both directly related to temperature.

200

Rearrange the variables in the combined gas law to solve for T₂.

T₂=T₁ x P₂/P₁ x V₂/V₁

300

A weather balloon is filled with 15.0 L of helium at a temperature of  25 °C and a pressure of 685 mmHg. What is the pressure, in millimeters of mercury, of the helium in the balloon in the upper atmosphere when the final temperature is  −35 °C and the final volume becomes 34.0 L, if the amount of He does not change?  

241mmHg

400

A sample of hydrogen H2 gas at 127 °C has a pressure of 2.00 atm. At what final temperature, in degrees Celsius, will the pressure of the H2 decrease to 0.25 atm, if volume and amount of gas do not change?

-223°C

500

A weather balloon is filled with 15.0 L of helium at a temperature of  25 °C and a pressure of 685 mmHg. What is the temperature, in degrees Celsius, if the helium in the balloon has a final volume of 22.0 L and a final pressure of 426 mmHg, if the amount of gas does not change?  

-1°C

Solutions

100

What does Soluble mean

A substance that can be dissolved in a liquid, forming a solution

200

What does Solvent mean?

A solvent is a substance in which a solute dissolves to form a solution.

300

Identify the solute and the solvent - 

• 10.0 g of NaCl and 100.0 g of H₂O                

NaCl, solute; H₂O, solvent

400

 A solution is prepared by dissolving 15 grams of sodium chloride (NaCl) in 85 grams of water. What is the mass percent of NaCl in the solution?

15%

500

A solution is made by dissolving 20 grams of sugar C₆H₁₂O₆ in 180 grams of water. What is the mass percent of sugar in this solution?

10%