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Anika [276]
3 years ago
7

Suppose that 70g of a substance is dissolved in 100cm^3 of water at 80°C. How much of the substance, in grams, will precipitate

when the solution is cooled down to 30°C?
A. 55
B. 45
C. 10
D. 30
E. 25

Chemistry
1 answer:
Arisa [49]3 years ago
3 0
Well the substance amount would be 45 because it will rise and began to drop temp while still being heated debate over the eastern half of the Roman empire became known as the teacher apologise for the teacher apologise to do ariana grande
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Describe two ways you could model atoms in a substance.
ziro4ka [17]

Answer:

You can model a substance doing a Lewis structure

And also you can model it doing a bond-line structure.

3 0
3 years ago
I’m confused because this is the answer key and I don’t know how they got the answer to number 1)
Tems11 [23]

Question One

It's more a question of unscrambling what is there. The answer is correct.

If you look at your periodic table, there is such an element as Na which I suspect might be the problem.

It has an atomic mass of 23. It's atomic number is 11 which means it is the 11th member (by mass) on the periodic table. The other 2 are oxygen and hydrogen.  So Oxygen has an atomic mass of 16 and Hydrogen has an atomic  mass of 1.

Oxygen is number 8 on the periodic table and hydrogen is number 1.

Molecular Mass

Na = 23

O = 16

H = 1

Total 40, just as the answer key says. I've probably given you more than you wanted to know, but if you still have trouble, leave a note.

5 0
3 years ago
Which statement best describes a physical property?
ArbitrLikvidat [17]
The first I believe
3 0
3 years ago
What is the answer to this problem
Akimi4 [234]

Answer:

380.5g/mol

Explanation:

The molar mass of a compound can be obtained by adding the molar masses of the elements present in the compound.

The molar mass of Cu3(PO4)2 can be obtained as follow:

Molar Mass of Cu = 63.5g/mol

Molar Mass of P = 31g/mol

Molar Mass of O = 16g/mol

The molar mass of Cu3(PO4)2 = (63.5x3) + 2[31 + (16x4)] = 190.5 + 2[31 + 64] = 190.5 + 2[95] = 190.5 + 190 = 380.5g/mol

4 0
4 years ago
A system of ideas that explains many related observations and is supported by a large body of evidence collected through scienti
wlad13 [49]
B. Theory
The hypothesis that stand the test of time (often tested and never rejected) is called theory. A theory is supported by a great dealcof evidence.
6 0
3 years ago
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