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Q 1/21
Score 0
Jane dissolves 8 grams of sugar in 50 milliliters of water. What is the solvent in this scenario?
120
sugar and water
Jane
sugar
water
Q 2/21
Score 0
What type of water is formed from boiling the water, catching the steam, and then condensed back to water?
120
deionized water
distilled water
tap water
aqueous
21 questions
Q.
Jane dissolves 8 grams of sugar in 50 milliliters of water. What is the solvent in this scenario?
1
120 sec
Q.
What type of water is formed from boiling the water, catching the steam, and then condensed back to water?
2
120 sec
Q.
During a chemical change heat energy is released, what do we call the heat energy released during a chemical change?
3
120 sec
Q.
Which word would you use to describe kool-aid?
4
120 sec
Q.
What do we call a solution that has very little solute dissolved in a solvent?
5
120 sec
Q.
Sometimes when I go to the river I see bugs that can walk on water. Why do the bugs not fall into the water?
6
120 sec
Q.
The Dead Sea is the saltiest sea in the world. It contains 332 grams of salt per 1000 grams of water. What is the percent concentration by mass?
7
120 sec
Q.
Calculate the number of moles of potassium iodide (KI) needed to make one liter of 0.75 M solution.
8
120 sec
Q.
Calculate the number of grams of potassium iodide (KI) needed to make one liter of a 0.75 M solution.
9
120 sec
Q.
In a coffee cup calorimetry experiment 1.75 g of Zn (s) is added to 100.0 mL of 1.0 M HCl initially at 21.0 degrees Celsius. The temperature rises to 30.1 degrees Celsius. What is the heat of the reaction (delta H) per mole of Zn? Assume that the specific heat of the acid is the same as that of pure water.
10
120 sec
Q.
In one experiment a student mixed 100.0 mL of water with 2.60 g of ammonium nitrate (NH4NO3(s)) in a coffee cup calorimeter. The initial temperature of the water was 24.5 degrees Celsius. After the ammonium nitrate was added, the solution was stirred and the final temperature of the mixed solution was 20.2 degrees celsius. Calculate the heat change (enthalpy) for the dissolution of NH4NO3(s) in kilo joules per mole of solid dissolved. Assume the specific heat of the solution is the same as pure water.
11
120 sec
Q.
If I add 25 mL of water to 125 mL of a 0.15 M NaOH solution, what will the molarity of the diluted solution be?
12
120 sec
Q.
When heat is produced during a chemical reaction, the reaction is said to be endothermic or exothermic?
13
120 sec
Q.
During an exothermic reaction is the change in enthalpy of the reaction a positive number or a negative number.
14
120 sec
Q.
Pick the best answer that describes the relation ship between heat of solution and change in enthalpy.
15
120 sec
Q.
Why is potassium chloride able to dissolve in water?
16
120 sec
Q.
How many moles are in 325 g of (NH4)Cr2O7?
17
120 sec
Q.
What is the molarity of 28.9 g of CaCl2 dissolved in water to make a 0.78 L solution
18
120 sec
Q.
What is the percent by mass of N in Ca(CN)2?
19
120 sec
Q.
To increase the temperature of 100 g of H20 (s) from -50.0 degrees celsius to -10.0 degrees celsius, how much energy is required?
