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Alex_Xolod [135]
3 years ago
7

Samuel adds a teaspoon of salt to a glass of water. He notices that the salt disappears. Samuel takes a sip to discover that the

water tastes salty. What kind of change has occurred?
A.
It’s a chemical reaction because a new substance has formed.
B.
It’s a physical change because the water and the salt kept their original properties.
C.
It’s an example of synthesis because two substances reacted to give one substance.
D.
It’s a chemical reaction because the water now tastes salty but originally did not.
Chemistry
2 answers:
jeyben [28]3 years ago
7 0

Answer:a

Explanation:It’s a chemical reaction because a new substance has formed.

Vera_Pavlovna [14]3 years ago
4 0

Answer:

B

Explanation:

B It’s a physical change because the water and the salt kept their original properties.

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3 years ago
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If 15.0 mL of phosphoric acid completely neutralizes 38.5 mL of 0.150 mol/L calcium hydroxide, what is the concentration of the
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Answer:

Let me give it a try.

H3PO4 + Ca(OH)2 = Ca3(PO4)2 + H2O

Balancing this reaction

2H3PO4 + 3Ca(OH)2 == Ca3(PO4)2 + 6H2O.

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Volume = 38.5ml = 0.0385L

Moles of Ca hydroxide = 0.150m/L x 0.0385L

(Notice the units canceling out...leaving moles).

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From balanced reaction...

3moles of Ca(OH)2 completely reacts with 2moles of H3PO4

0.005775moles of Ca(OH)2 would completely react with....

= 0.005775 x 2/(3)

=0.00385moles of H3PO4.

Now we're looking for its Concentration in Mol/L

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If this is wrong

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5.
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Answer:

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