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Arte-miy333 [17]
3 years ago
12

Can someone help me??

Chemistry
2 answers:
Lubov Fominskaja [6]3 years ago
8 0

Answer: B. ridge push and slab pull

Explanation: Took the test.

Kryger [21]3 years ago
6 0

Answer:

I do K12 and c is correct!

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Which of the following is the best definition of a physical change?
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I think answer is

C. Something that can be observed or measured while changing the identity of the substance
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If you are given the molarity of a solution, what additional information would you need to find the weight/weight percent (w/w%)
Ludmilka [50]

Answer:

- The molar mass of the solute, in order to convert from moles of solute to grams of solute.

- The density of solution, to convert from volume of solution to mass of solution.

Explanation:

Hello,

In this case, since molarity is mathematically defined as the moles of solute divided by the volume of solution and the weight/weight percent as the mass of solute divided by the mass of solution, we need:

- The molar mass of the solute, in order to convert from moles of solute to grams of solute.

- The density of solution, to convert from volume of solution to mass of solution.

For instance, if a 1-M solution of HCl has a density of 1.125 g/mL, we can compute the w/w% as follows:

w/w\%=1\frac{molHCl}{L\ sln}*\frac{36.45gHCl}{1molHCl}*\frac{1L\ sln}{1000mL\ sln}*\frac{1mL\ sln}{1.125g\ sln}    *100\%\\\\w/w\%=3.15\%

Whereas the first factor corresponds to the molar mass of HCl, the second one the conversion from L to mL of solution and the third one the density to express in terms of grams of solution.

Regards.

4 0
3 years ago
The mass number of this atom is_________<br><br>​
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7

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The mass number is neutrons plus protons

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