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Lana71 [14]
3 years ago
7

A physical change will or will not change the composition of an identity of the substance.​

Chemistry
1 answer:
SVEN [57.7K]3 years ago
6 0
Physical change will not change the composition of a substance.
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How many milliliters of 0.258M NaOH are required to completely neutralize 2.00 g of acetic acid HC2H3O2?
madam [21]

Answer:

0.129 L = 129.0 mL.

Explanation:

  • NaOH neutralizes acetic acid (CH₃COOH) according to the balanced reaction:

<em>NaOH + CH₃COOH → CH₃COONa + H₂O.  </em>

  • According to the balanced equation: 1.0 mole of NaOH will neutralize 1.0 mole of CH₃COOH.  

<em>no. of moles of CH₃COOH = mass/molar mass </em>= (2.0 g)/(60 g/mol) = <em>0.033 mole.  </em>

<em> </em>

  • For NaOH:

no. of moles = (0.258 mol/L)(V)

  • At neutralization: no. of moles of NaOH = no. of moles of CH₃COOH  

∴ (0.258 mol/L)(V) = 0.033 mole

<em>∴ The volume of NaOH</em> =  (0.033 mole)/(0.258 mol/L) = <em>0.129 L = 129.0 mL.</em>

8 0
4 years ago
What is one danger associated with blizzards
notka56 [123]
One danger associated with blizzards is that blizzards are severe winter storms that pack a combination of blowing snow and wind resulting in very low visibilities. While heavy snowfalls and severe cold often accompany blizzards, they are not required. Sometimes strong winds pick up snow that has already fallen, creating a blizzard.

I hope this helps.
4 0
3 years ago
As the temperature of a gas sample increases, the number of molecules and volume remaining constant, the pressure exerted by the
Luba_88 [7]

Answer:

A. increases

Explanation:

According to the Gay-Lussac's law:-

Thus, at constant volume and number of moles, Pressure of the gas is directly proportional to the temperature of  the gas.

P ∝ T

Also,  it can be written as:-

\frac {P_1}{T_1}=\frac {P_2}{T_2}

Thus, if the temperature is increased, the pressure exerted by the gas also increases.

8 0
4 years ago
Use the following information to answer the next two questions:......Aqueous lithium chloride, liquid dihydrogen monooxide, and
mestny [16]

Answer:

e

f

Explanation:

7 0
3 years ago
Most galaxies in the universe are irregular-shaped galaxies. True False
klemol [59]
<h2>Hello!</h2>

The answer is: False.

Why?

It's known that most common galaxies are spiral - shaped, but according to some studies, the irregular - shaped galaxies can not be even considered "spiral shaped".

Irregular - shaped are galaxies defined by their lack of structures, and they were formed by an external gravitonal force acting, in fact, it's believed that they were spiral or elliptical galaxies before.

An example of irregular - shaped galaxies is Small Magenallic Cloud.

Have a nice day!

5 0
4 years ago
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