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Blababa [14]
3 years ago
11

PLEASE HELP I WILL GIVE BRAINLY TO CORRECT ANSWER (after I finish test)

Chemistry
1 answer:
riadik2000 [5.3K]3 years ago
8 0

Answer:

i think its 2

Explanation:

because the H2 is seperate from the others it is the only one with a number.

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Which is a pure substance?<br> soda<br> gasoline<br> salt water<br> carbon dioxide
hram777 [196]

Answer: Carbon dioxide is a pure substance.

Explanation: A pure substance is defined when a substance has a single type of molecule. If more than 1 type of molecule is present in a substance, then it is considered as a mixture.

  • Soda is basically a mixture of water and carbon dioxide. More than 1 type of molecule is present.
  • Gasoline is a mixture of may gases. More than 1 type of molecule is present.
  • Salt water contains salt and water molecules, hence it is considered as a mixture.
  • Carbon dioxide has only 1 type of molecule which is CO_2 molecules. Hence, it is a pure substance.
8 0
3 years ago
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Can someone help me with these two questions?
guapka [62]

Answer:

no

Explanation:

I can't help

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4 0
3 years ago
A solution that is 0.20 m in hcho2 and 0.15 m in nacho2 find ph
Mashutka [201]
We are given
0.2 M HCHO2 which is formic acid, a weak acid
and
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To get the pH of a base buffer, we use the formula
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From, literature, pKa = 1.77 x 10^-4
Substituting into the equation
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So, the pH of the buffer solution is 13.87
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nikitadnepr [17]
Decantation is a process for the separation of mixtures of immiscible liquids or of a liquid and a solid mixture such as a suspension.
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3 years ago
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