1. Match each reasoning statement with the piece of evidence it supports. Because high temperature water molecules are moving faster, they are able to support more solute particles in the solution. ✅ - sugar is more soluble in hot water than it is in cold

Smaller pieces of solute have more surface area so come in contact more often with the solvent. ✅ - Rock salt dissolves more slowly than table salt

The solution in the beaker must be an acid. The hydrogen ions from the acid are released as a gas as a salt is formed in the reaction. ✅ Woah, look at the gas being produced when I put a piece of metal in this beaker of unknown liquid!

A color change can result from a change in pH. A different concentration of hydrogen ions causes the indicator to undergo a chemical change. - ✅ I have 2 identical hydrangea bushes, but one has pink flowers and the other has blue.

2. Which statement about John and Jacob is true. The barrels have the same mass and are lifted from the dock all the way up into the ship.

❌ Jacob's mechanical advantage is higher than John's.

❌ Jacob does more work than John.

( one of these is the correct answer)

John must exert a great force to lift his barrel.

Both do the same amount of work to load the barrel onto the ship.

3.Choose the correctly matched wave phenomenon.✅Diffraction was the correct answer. Diffraction is when a wave passes through a slit or around a barries, it bends as it "sticks" to the barrier.

4.Check the true statements about sound and light

✅Electromagnetic waves with higher frequencies are more energetic.

Yes!

✅Sound travels faster in steel than in water.

5.What is the difference between the composition of covalent and ionic compounds?

✅covalent compounds are generally all nonmetals whereas ionic compounds are generally formed between a metal and a nonmetal

6.When Calcium and Oxygen join together,

✅a Calcium atom donates two electrons to an Oxygen atom to form an ionic bond. Both now have an octet.

7.Which formula is correct for potassium nitride? Is it ionic or covalent?

✅ K3N ionic

8.Which formula is correct for diphosphorus pentoxide? Is it ionic or covalent?

✅ P2O5 covalent

9. Choose all that correctly show the name of each compound. All formulas are written with the correct ratio of atoms.

✅ Al2O3 Aluminum Oxide

✅ BrF5 Bromine Pentafluoride

10.Use the graph to determine which solution is saturated.

wrong answers:

❌5 grams of sugar dissolved at 80 degrees C

❌250 grams of sugar dissolved at 20 degrees C

other two choices:

100 grams of sugar dissolved at 90 degrees C

140 grams of sugar dissolved at 55 degrees C

Hint: A point on the line will represent a saturated solution. Any point below the line is unsaturated and any point about the line represents a solution that is supersaturated.

Find the given grams of solute on the Y-axis, the temperature on the X-axis, and follow them onto the grid to locate each point. Then determine if the point is on the line, under the line, or above the line.

11.What are some ways we can increase the rate of dissolving? Check all correct answers.

✅Agitate (stir) the solution ✅Shake the solution ✅crush the solute into smaller particles ✅Heat the solution

12.How can you increase the solubility of sugar in water? Check all correct answers.

✅ Heat the solution

13.Match the chemical formula to each statement about the solubility curve. (All numbers in the formulas below are subscripts)

Has the same solubility as NaCl at 60 degrees.- ✅ K2Cr207

Most soluble at 10 degrees. - ✅ NaN03

70 grams dissolve at 35 degrees to make a saturated solution. - ✅ Pb(N03)2

20 grams at 70 degrees makes a supersaturated solution - ✅ Ce2(S04)3

14.Check all true statements about acids and bases.

✅ Acids turn blue litmus red

✅ HCl is an acid and NaOH is a base.

✅ A substance with a pH of 7.0 is considered neutral

✅ A substance with a pH of 2.0 is a strong acid

(images below is for question 14 and 12 and 10 and 2 in this order)