Polyatomic Ions
What is the name of NO3-
Nitrate
Round the following number to three significant figures:
4.567
4.57
If I dissolve salt in water, what is the solute?
Salt
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.
What does Soluble mean
A substance that can be dissolved in a liquid, forming a solution
What is the name of OH-
Hydroxide
How many significant figures are in the following measurement?
0.00780
A sugar cube completely dissolves when added to a cup of coffee. Is this saturated or unsaturated?
unsaturated
Rearrange the variables in the combined gas law to solve for T2.
T2=T1 x P2/P1 x V2/V1
What does Solvent mean?
A solvent is a substance in which a solute dissolves to form a solution.
What is the name of PO43-
Phosphate
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)
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.
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
Identify the solute and the solvent -
10.0 g of NaCl and 100.0 g of H2O
NaCl, solute; H2O, solvent
What is the name of ClO4-
Perchlorate
Add the following numbers and give the answer with the correct number of significant figures:
12.11 + 0.034 + 5.6
17.7
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
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
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%
What is the name of H2PO4-
Dihydrogen Phosphate
Divide the following numbers and express the answer with the correct number of significant figures:
0.00456 ÷ 1.23
0.00371
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
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
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%