3 years ago

When a substance cools down, is it releasing or absorbing energy?

1 answer:

4 0

<span>When something becomes cold or freezes such as water,it is releasing energy.The temperature continues to decrease more energy is given up and released.It stays a constant temperature as more energy is released to maintain the temperature needed to achieve the correct degree needed.</span>

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Properties of matter with three example each

Cerrena [4.2K]

Answer:

Extensive properties vary with the amount of the substance and include mass, weight, and volume. Intensive properties, in contrast, do not depend on the amount of the substance; they include color, melting point, boiling point, electrical conductivity, and physical state at a given temperature.

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3 years ago

What volume of 2.0 M HCl in mL will neutralize 25.0 mL of 1.00 M KOH?

MakcuM [25]

CaVa=CbVb
2xV=1X25
V=25/2
V=12.5ML

3 0

3 years ago

1 pts.what is the charge on the hydrogen end of a water molecule?

Savatey [412]

Positive

And Negative for oxygen.

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3 years ago

The mole fraction of NaCl in an

posledela

The weight/weight percent(%w/w) of NaCl in solution : 33.03%

<h3>Further explanation</h3>

Given

Mole fraction of NaCl : 0.132

Required

The weight/weight percent of NaCl

Solution

1 mol solution : 0.132 mol NaCl + 0.868 mol H₂O

mass NaCl :

$\tt 0.132\times 58.44 g/mol=7.714~g$

mass H₂O :

$\tt 0.868\times 18.016~g/mol=15.64~g$

Total mass = 7.714 + 15.64 = 23.354 g

$\tt \%NaCl=\dfrac{7.714}{23.354}\times 100\%=33.03\%$

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3 years ago

What volume of 12.0 M sulfuric acid is needed to prepare 300.0 mL of 2.50 M solution?

Zepler [3.9K]

Answer:

n=c*V

=2.50*300x10^-3

=.75 moles of hcl

v=n/c

=.75/12

=.0625 L

convert to mL

=62.5mL

4 0

3 years ago