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goldenfox [79]
2 years ago
11

What is one source for the variation that drives natural selection?

Chemistry
2 answers:
Inessa05 [86]2 years ago
8 0
Over production because it
otez555 [7]2 years ago
6 0
The answer is over production
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3.01 × 1023 molecules H2O
grandymaker [24]
3079.23 is what you get when you multiply the answers.
6 0
3 years ago
What is the ionic compound of Na^+ and CO3^2-
maksim [4K]

To find the chemical formula of an ionic compound, the first step is to find the charge of the 2 ions. As given already, the charge of sodium ion is 1+, and carbonate ion has a charge of 2-. We can picture it like that: Sodium ion loses 1 electron and carbonate ion gains 2.

The next step is to find how the 2 ions can lose and gain electrons equally. In this case, since each Na ion only loses 1 electron, it cannot satisfy the need of one carbonate ion, since they need 2, not 1. Therefore, 2 Na ions can cover the need of one carbonate ion. So, the ratio of Na to CO3 ion should be 2:1.

Now just combine the 2 ions, positive one at the front, which makes it NaCO3, make sure you do not add the charge and notice that CO3 is a molecule itself so do not remove the 3. Now because the ratio is 2:1, so the final formula is Na2CO3, no need to add 1 if the ratio is 1.

Your answer should be Na2CO3.

8 0
2 years ago
Need help asap
zzz [600]
Question 4 is C. 13 I believe
5 0
3 years ago
Which of the following atoms contains the same number of neutrons as an atom of Calcium-40? (2 points) Select one: a. Potassium-
SVEN [57.7K]
First, let's find the number of neutrons in Calcium-40. to find the number of neutrons, you need to take the atomic mass minus atomic number

neutrons in Calcium---> 40 - 20 (atomic number) = 20 neutrons

potassium-40---> 40- 19= 21
scandium-44----> 44- 21= 23
argon-38---------> 38- 18= 20
chlorine-36------> 36- 17= 19

the answer is argon-38
5 0
3 years ago
Read 2 more answers
HELP PLZZ!!!!! a cup of coffee considered _____. a)solute b)precipitation c)solution d)solvent
Sloan [31]
The answer is solvent
3 0
2 years ago
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