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FinnZ [79.3K]
3 years ago
11

When it is winter, the United States receives the least direct solar energy, as compared with the rest of the year. Why does thi

s happen?
Chemistry
1 answer:
devlian [24]3 years ago
5 0

The Northern Hemisphere is titled away from the sun

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Economics is about the production of goods and services which requires that allocation of what
yuradex [85]

It requires the allocation of resources.

6 0
3 years ago
A gas made up of atoms escapes through a pinhole times as fast as gas. Write the chemical formula of the gas.
Artemon [7]

A gas made up of atoms escapes through a pinhole 0.225times as fast as gas. Write the chemical formula of the gas.

Answer:

Explanation:

To solve this problem, we must apply Graham's law of diffusion. This law states that "the rate of diffusion or effusion of a gas is inversely proportional to the square root of its molecular mass at constant temperature and pressure".

Mathematically;

                 \frac{r_{1} }{r_{2} }  = \frac{\sqrt{m_{2} } }{\sqrt{m_{1} } }

r₁ is the rate of diffusion of gas 1

r₂ is the rate of diffusion of gas 2

m₁ is the molar mass of gas 1

m₂ is the molar mass of gas 2

let gas 2 be the given H₂;

   molar mass of H₂ = 2 x 1 = 2gmol⁻¹

rate of diffusion is 0.225;

  i .e r1/r2 = 0.225

          0.225 = √2  /  √ m₁

           0.225 = 1.414 / √ m₁

           

       √ m₁  = 6.3

           m₁  = 6.3²  = 39.5g/mol

The gas is likely Argon since argon has similar molecular mass

5 0
3 years ago
A 5.00-g sample of copper metal at 25.0 °C is heated by the addition of 133 J of energy. The final temperature of the copper is
vekshin1

<u>Answer:</u> The final temperature of the copper is 95°C.

<u>Explanation:</u>

To calculate the final temperature for the given amount of heat absorbed, we use the equation:

Q= m\times c\times \Delta T

Q = heat absorbed  = +133 J (heat is added to the system)

m = mass of copper = 5.00 g

c = specific heat capacity of copper = 0.38 J/g ° C      

\Delta T={\text{Change in temperature}}=T_2-T_1

T_1=25^oC

Putting values in above equation, we get:

+133J=5.00g\times 0.38J/g^oC\times (T_2-25)\\\\T_2=95^oC

Hence, the final temperature of the copper is 95°C.

3 0
3 years ago
Which of the following is a scientific question? O A. How can I make a peach cobbler? O B. What chemicals cause most plants to b
igor_vitrenko [27]
The answer is B. Because think about it, it’s not a scientific fact that brown dogs are better pets, and the best color for your room isn’t it because the answer would be an opinion of someone not a fact. I hope this might help you.
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