Chemistry, 21.07.2019 11:30 FailingstudentXD

Which formula shown is incorrect for the name given? which formula shown is incorrect for the name given? calcium nitrate: ca(no3)2 ammonium cyanide: nh4cn strontium carbonate: srco3 potassium acetate: kc2h3o2 lithium sulfate: liso4

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Answer from: ashlynneboogs0056

5.Lithium sulfate: LiSO_4

Explanation:

We have to find the formula which is incorrect for the name given

1.Calcium nitrate : Ca(NO_3)_2

We know that Charge on calcium ion =+2

Charge on nitrate ion=-1

Therefore, the formula of calcium nitrate is Ca(NO_3)_2 .

Hence, it is true.

2.Ammonium cyanide: NH_4CN

Charge on ammonium ion=+1

Charge on cyanide ion=-1

Therefore, the formula of ammonium cyanide is NH_4CN .

Hence, it is true.

3.Strontium carbonate : SrCO_3

Charge on strontium ion=+2

Charge on carbonate ion=-2

Therefore, the formula of strontium carbonate is SrCO_3 .

Hence, option is true.

4.Potassium acetate: KC_2H_3O_2

Charge on potassium ion=+1

Charge on acetate ion=-1

Therefore , the formula of potassium acetate is KC_2H_3O_2 .

Hence, option is true.

5.Lithium sulfate: LiSO_4

Charge on lithium ion=+1

Charge on sulfate ion=-2

Therefore, the formula of lithium sulfate is Li_2SO_4 .

But given formula is LiSO_4 .

Hence, option is false.

Answer from: Quest

Answer: abeexplanation:

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.

Answer from: Quest

Carbon based or cells?

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