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nirvana33 [79]
3 years ago
8

If an atom contains 12 protons and 10 neutrons, what's its mass number?

Chemistry
1 answer:
user100 [1]3 years ago
7 0
A = Z + n

A = 12 + 10

A = 22

Answer C

hope this helps!
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1 year ago
What molarity is prepared when a solution contains 0.277 moles of calcium bromide in 500 mL of solution (must change mL to Liter
Vladimir79 [104]

Answer:

0.554M of Calcium Bromide

Explanation:

Molarity by defintion is #of moles of something/litres of solution.

Therefore, here, we have 0.277 moles of calcium bromide and 500mL (divide 500ml by 1000 to go from mL to L because for every 1L there's 1000mL) or 0.5L.

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5 0
3 years ago
What is sodium fluoride?
ZanzabumX [31]

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Explanation:

5 0
2 years ago
A student dropped a piece of nickel metal into a solution of HCl(aq). He observed the formation of gas bubbles and collected the
omeli [17]

Answer:

a. The student performed the splint test incorrectly. He should of observed a popping sound when the splint was placed in the test tube.

Explanation:

It is given that a student performed an experiment where he dropped a nickel metal in to HCl solution. He observed the reaction and performed a splint test in the test tube that is filled with a gas which is formed while Nickle is dropped into the solution of HCl.

But the experiment that the student performed was incorrect. He must have observed the popping sound when the splint was placed in the test tube.

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Thus the correct option is (a).

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2 years ago
Which of the following is an example of a chemical change?
alexdok [17]

Answer:

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2 years ago
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