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mojhsa [17]
3 years ago
11

Is drawing on paper a chemical or physical change

Chemistry
2 answers:
Tatiana [17]3 years ago
3 0

Answer:5

Explanation:

pav-90 [236]3 years ago
3 0

Answer:

physical change

Explanation:

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Which of the following is a correct representation of the isotope of sulfur that has 19 neutrons? sulfur-19 sulfur-35 sulfur-16
Delicious77 [7]

Answer:

sulfur-35

Explanation:

Sulfur-35 is a radioactive isotope that contains 19 neutrons.

Isotopes are represented with mass numbers. Mass number is the addition of number of proton and number of neutrons.

The number of proton in sulfur = 16

Number of neutron = 19

So, mass number = no. of protons + no. of neutrons

                              = 16 + 19

                              = 35

Hence, the correct answer is sulfur-35.

4 0
3 years ago
What are some of the main features found on the Sun’s surface. Describe these features in detail.
vodomira [7]
Sun spots- dark circles on the sun’s surface that I believe are areas of cooler temperatures.
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7 0
3 years ago
Cells with nuclei belong in the domain<br> Archaea<br> Bacteria<br> Eukarya<br> Protists
svet-max [94.6K]
Eukarya cause all cells with nuclei are considered eukaryotic
5 0
3 years ago
Read 2 more answers
Where is most of Earth's liquid water ? what must be done so humans can drink it ?
LiRa [457]
You're right it's the oceans.. since most is salt water, the salt has to be boiled out 
4 0
3 years ago
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What volume of 0.194 MNa3PO4 solution is necessary to completely react with 85.5 mL of 0.109 MCuCl2 ?
ira [324]

Answer:

35.9 ml

Explanation:

Start with the balanced equation:

3CuCl2(aq)+2Na3PO4(aq)→Cu3(PO4)2(s)+6NaCl(aq)

This tells us that 3 moles of CuCI2 react with 2 moles Na3PO4-

∴  1 mole CuCl2 will react with 2/3 moles Na3PO4

We know that concentration = moles/volume i.e:

c= n/v

∴n=c×v

∴nCuCl2=0.107×91.01000=9.737×10−3

I divided by 1000 to convert ml to L

∴nNa3PO4=9.737×10−3×23=6.491×10−3

v=nc=6.491×10−30.181=35.86×10−3L

∴v=35.86ml

4 0
2 years ago
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