Lab Quiz On Physical And Chemical Change Lab Including Additional Steps

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Lab Quiz on Physical and Chemical Change Lab including Additional Steps

Lab Quiz on Physical and Chemical Change Lab including Additional Steps (CONTINUED)

Name: ___________________________ Period: ____________

Lab Quiz on Physical and Chemical Change Lab including Additional Steps

"A NEW SUBSTANCE IS FORMED" IS NOT A SUFFICIENT ANSWER FOR QUESTIONS BELOW

Answer the following questions using your Lab notebook (specifically Physical and Chemical Change Lab and Additional Steps in Physical and Chemical Change Lab - Revised 2022-2023).

1) In Step 1 of the original lab, circle the change:
a) When you added energy to wax in test tube: Physical or Chemical
b) When you added energy to the candle (made of wax): Physical or Chemical

2) In Step 3 of the original Physical and Chemical Change Lab, you added some AgNO₃ solution to the NaCl solution. When you added the two solutions together, answer the following:
a) Was this a CHEMICAL CHANGE or PHYSICAL CHANGE (circle one).
b) In a sentence or two explain why (use lab observation to support explanation) what you circled above ("new substance is formed" is not an observation).

3) In Step 4, you added HCl (Hydrochloric acid) solution to a piece of Mg (Magnesium metal):
a) Was this a CHEMICAL CHANGE or PHYSICAL CHANGE (circle one)
b) What observation(s) determine what you circled above ("new substance is formed" is not an observation). DO NOT NEED TO EXPLAIN WHY HERE

4) In Step 5 of the original lab, you ground up the Copper (II) sulfate, added it to a test tube, heated it, let it cool and then added water. What observation showed you that this was a PHYSICAL CHANGE?

Name: ___________________________ Period: ____________

Lab Quiz on Physical and Chemical Change Lab including Additional Steps (CONTINUED)

"A NEW SUBSTANCE IS FORMED" IS NOT A SUFFICIENT ANSWER FOR QUESTIONS BELOW

Answer the following questions using your Lab notebook (specifically Physical and Chemical Change Lab and Additional Steps in Physical and Chemical Change Lab - Revised 2022-2023).

5) In Step C of the Additional Steps, which of the following (circle answer) DID NOT have a Tyndal Effect, Colloid, Suspension or Solution?

6) What characteristic(s) of the particles in the mixtures (Colloid, Suspension and Solution) causes the Tyndal Effect?

7a) What was the other reactant of Step B besides the Mg ribbon?

7b) What was the observed characteristic(s) of the product of this chemical change/reaction?

7c) What was the product NAME (from notes you added in class after doing the lab).

8) What Conservation Law helped you to determine what this product could be add up of? (no explain needed here)

9a) In Step A, what was your observation that a "precipitate" was formed after adding each of the two solutions to the Copper (II) sulfate solution?

9b) From your observation from Step A and post-lab notes, what caused the "blue" color in the Copper (II) sulfate solution?