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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 should you that this was a PHYSICAL CHANGE?