A student determines the copper(II) content of a solution by first precipitating it as copper(II) hydroxide, and then decomposing the hydroxide to copper(II) oxide by heating. How many grams of copper(II) oxide should the student obtain if his solution contains 40.0 mL of 0.462 M copper(II) nitrate?

1.44g of CuO

Explanation:

First we put down the balanced chemical reaction equations involved. Then we obtain the amount of Cu2+ present in the Cu(NO3) from the information provided. This same amount of Cu2+ is present in Cu(OH)2 which decomposes to give copper II oxide. From the balanced reaction equation, we obtain the mass of CuO obtained from this amount of Cu2+ as shown in the image attached.

1. the question asks the most appropriate, which seems to rule out "all of the above." your choice appears to be the correct one.

2. the protocol described is good for identifying correlation, but not cause and effect. for cause/effect, you need to devise a protocol that will assign the treatment (or not) to groups that have essentially the same "demographics" with respect to all the other variables. your choice regarding control group seems appropriate. random assignment of treatment (choice d) may be appropriate also. (i think you can argue that b and d are just different descriptions of the same method.)

3. d will randomize the birds, but may not guarantee there are 10 in each group. e will do both, so seems the better choice.

comment on question 2

based on the problem statement, it seems clear that confident, attentive drivers are more likely to use daytime running lights. so, the protocol might need to be devised in such a way that the lights would be turned on or off without the driver's knowledge. (an attentive driver will figure it out.) assigning a confident, attentive driver to a group required to drive without running lights might mess with his/her confidence and attentiveness. you don't want your experiment to do that. (nor do you want the experiment to subject a driver to greater risk of accident as a consequence of driving without running lights.) experiments involving human safety are always problematic.

a is the answer to this question

explanation: