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Kruka [31]
2 years ago
8

What are the observed results of an experiment that occur from changes in independent variable

Chemistry
1 answer:
gayaneshka [121]2 years ago
3 0
I believe it is the dependent variable b/c it is the thing(s) that is been observe or measure
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While driving your rental car on your trip to Europe, you find that you are getting 9.7 kilometers per liter of gasoline. What d
Drupady [299]
<span>1 gallon = 4. 5 litres
1 litre = 1/4.5 gallons = 2/9 gallons

1 km = 5/8 mile

9.8 km = 9.8 x 5/8 miles = 49/8 miles

49/8
-------- mpg
2/9

49 x 9
--------- mpg
16

27.6 mpg </span>
6 0
3 years ago
A sample of gas has a volume of 2.00 L and a pressure of 0.750 kPa when its
Gennadij [26K]

Answer:

The final temperature is 397 K.

Explanation:

Boyle's law relates volume and pressure by expressing:

"The volume occupied by a certain gaseous mass at constant temperature is inversely proportional to pressure"

Boyle's law is expressed mathematically as:

P * V = k

where k is a constant.

Charles's Law consists of the relationship between the volume and the temperature of a certain amount of ideal gas, which is kept at a constant pressure. This law states: "At constant pressure, the volume that a gas sample occupies is directly proportional to the temperature"

So, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the ratio between the volume and the temperature will always have the same value:

\frac{V}{T}=k

Finally, Gay-Lussac's law establishes the relationship between pressure and temperature of a gas when the volume is constant. This law states that the pressure of a fixed volume of a gas is directly proportional to its temperature. That is, if the volume of a certain quantity of ideal gas at moderate pressure is kept constant, the quotient between pressure and temperature remains 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. So, you have:

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

Supposing you have a gas that is at a pressure P1, at a volume V1 and at a temperature T1 at the beginning of the experiment, by varying the temperature to a new value T2, then the pressure will change to P2 and the volume to V2, and will fulfill:

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

In this case, you have:

  • P1= 0.750 kPa
  • V1= 2 L
  • T1= 25°C= 298 °K (being 0°C=273°K)
  • P2= 0.500 kPa
  • V2= 4 L
  • T2= ?

Replacing:

\frac{0.750 kPa* 2 L}{298 K}=\frac{0.500 kPa*4 L}{T2}

and solving you get:

T2=\frac{0.500 kPa*4 L}{\frac{0.750 kPa* 2 L}{298 K}}

T2= 397 K

<u><em>The final temperature is 397 K.</em></u>

4 0
3 years ago
An unknown element is a mixture of
seropon [69]

Answer:

10.13086%

Explanation:

129y + 132(1-y) = 129.91

129y + 132 - 132y = 129.91

-3y = -2.09

y = 0.69666 (5 s.f.)

% abundance of 132X = 100% - (129×0.69666)%

                                    = 100% - 89.86914%

                                    = 10.13086%

                                    = 10.1% (3 significant figures)

*y is just a variable for the equation

8 0
2 years ago
What kind of reactions provide a star with energy?
lisov135 [29]

The nuclear fusion reaction is the source of energy in a star. In nuclear fusion reactions, the nuclei of two atoms combine to create a new atom with the release of a lot of energy. The nuclear fusion reaction takes place in the core of the star where two hydrogen atoms fuse to become one helium atom.

²₁H + ³₁H --> ⁴₂He + ¹₀n + 17.59 MeV

In the fusion reaction above deuterium fuses with tritium to form helium and releases ~18 mega electron volt of energy.

8 0
3 years ago
How many mole of copper, Cu are in 3.22 g of copper?​
Zolol [24]

Answer:

63.546

Explanation: Molecular weight of copper or mol The molecular formula for copper is Cu, The SI base unit for amount of substance is the mole

3 0
3 years ago
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