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PSYCHO15rus [73]
3 years ago
6

In determining the energy of activation, why was it prudent to run the slowest trial done at room temperature in the hot water b

ath and the fastest trial done at room temperature in the cold water bath?
Chemistry
1 answer:
Katen [24]3 years ago
4 0

Answer:In determining the energy of activation, why was it prudent to run the slowest trial done at room temperature in the hot water bath and the fastest trial done at room temperature in the cold water bath?

Explanation:

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A sample of helium occupies a volume of 180.0 ml at a pressure of 0.800 atm and a temperature of 29°C. What will be the
Brrunno [24]

Answer:

If the volume of the container is decreased to  90.0 ml and the pressure is increased to 1.60 atm the temperature will be 302 °K

Explanation:

Boyle's law says that "The volume occupied by a given gas mass at constant temperature is inversely proportional to the pressure", which is expressed mathematically as:  

P * V = k

Charles's Law consists of the relationship between the volume and temperature of a certain amount of ideal gas, which is maintained at a constant pressure, by means of a proportionality constant that is applied directly. In summary, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the ratio between volume and temperature will always have the same value:

\frac{V}{T} =k

Finally, Gay Lussac's law establishes that as the temperature increases, the gas molecules move more quickly and therefore the number of collisions against the walls increases, that is, the pressure increases since the container is of fixed walls and its volume can not change. Therefore, the ratio of pressure to temperature always has the same value (it is constant).

\frac{P}{T}=k

Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:

\frac{P*V}{T}=k

Having a state 1 at the beginning and a state 2 at the end is fulfilled:

\frac{P1*V1}{T1}=\frac{P2*V2}{T2}

In this case, you know:

  • P1= 0.800 atm
  • V1= 180 mL= 0.180 L (being 1 L=1000 mL)
  • T1= 29 °C= 302 °K
  • P2= 1.60 atm
  • V2= 90 mL= 0.09 L
  • T2=?

Replacing:

\frac{0.800 atm*0.180L}{302 K}=\frac{1.60 atm*0.09L}{T2}

Solving:

T2*\frac{0.800 atm*0.180L}{302 K}=1.60 atm*0.09L

T2=\frac{1.60 atm*0.09L}{\frac{0.800 atm*0.180L}{302 K}}

T2= 302 °K

<em><u>If the volume of the container is decreased to  90.0 ml and the pressure is increased to 1.60 atm the temperature will be 302 °K</u></em>

8 0
3 years ago
Suppose 53.0 ml of 0.320 m koh is mixed with 28.0 ml of 0.250 m hno3. what is the concentration of oh- ions after the reaction g
zheka24 [161]
Given:

Volume of KOH = 53.0 mL
Concentration of KOH = 0.320 M
Volume of HNO3 = 28.0 mL
Concentration of HNO3 = 0.250 M

Balanced Equation:

KOH + HNO3 ===> KNO3 + H2O

0.320   0.250        0              0

H2O ===> H+   +   OH-

Solve for the concentration of OH-
4 0
3 years ago
A sample of gas in a balloon has an initial temperature of 21 ∘C and a volume of 1310 L . If the temperature changes to 70 ∘C ,
bixtya [17]

Answer:

1528.3L

Explanation:

To solve this problem we should know this formula:

V₁ / T₁ = V₂ / T₂

We must convert the values of T° to Absolute T° (T° in K)

21°C + 273 = 294K

70°C + 273 = 343K

Now we can replace the data

1310L / 294K = V₂ / 343K

V₂ = (1310L / 294K) . 343K → 1528.3L

If the pressure keeps on constant, volume is modified directly proportional to absolute temperature. As T° has increased, the volume increased too

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3 years ago
Kichi made a table to identify where she might find acids and bases in her house based on their common uses.
sineoko [7]

The answer is: Ammonium hydroxide would be found in the pantry because it is found in vinegar.

Ammonim hydroxide (NH₄OH) is base and vinegar is acid.

pH of ammonium hydroxide is greater than 7 and vinegar has pH less than 7.

Ammonium hydroxide is a smelling, colorless liquid.

It is used as cleaning product, disinfectants and stain treaters.

Household ammonia contains 5-10% ammonium hydroxide.

5 0
3 years ago
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NaF name the ionic compound
Alenkinab [10]
Compound consisting of a sodium ion (Na+) with a plus one charge and a fluoride ion (F-) with a minus one charge. Hope I helped!! :)
6 0
3 years ago
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