Slides in IC2 Activity 8.2 Discuss
What do you observe about the combination of a copper square and water?
Is the effect in the experiment due to water? How do you know?
Copy and paste your argument from IQWST to here. I am going to assign you to someone's CER and you will provide feedback to them. You will evaluate their Claim, Evidence, and Reasoning. Please be polite and open minded when you write something to someone; we don't want to hurt his/her feelings.
A chemical reaction occurred when I combined the copper square and vinegar [Claim]. The copper square before the experiment had different color, hardness, solubility in water, density, and melting point from the solid on the copper square after the experiment. The color changed from brown to green. The hardness changed from a hard solid to a soft powdery solid. The copper square was not soluble in water and the copper acetate was. The density of copper is 8.96g/ml while copper acetate is 1.88g/ml. The melting point of copper is 1084 degrees and copper acetate is 115 degrees [Evidence]. The properties (melting point, hardness, solubility, color) of the solids before and after the experiment are different, so the solids are different substances and a new substance was formed. A chemical reaction always results in different substances before and after the reaction and we know they are different based on the change in properties. [Reasoning]
Copy and paste your response from IQWST conclusion question #2 to here.
By the end of today, you should recognize that combining copper with vinegar is a chemical reaction because the substances we started with (copper and vinegar) are different from the substances observed after 24 hours (copper acetate). We can tell the substances are different because the properties are
old substances interact/react to form new substances,
copper + vinegar → copper acetate + hydrogen gas
reactants → products
Don't respond here. We will just discuss verbally.