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2 years ago

Is it ture the sun moves across the sky

Chemistry

1 answer:

dlinn [17]2 years ago

5 0

Answer:

Yes, this statement is true. The sun moves across our sky from east to west.

Explanation:

(fun fact: on Mars the sun moves across the sky from west to east!)

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Two students are working together on a project. One student applies for to a book to move it across the table to the other perso

Softa [21]

Answer:

D.16 N

Explanation:

20 - 4 = 16

20 N - 4 N = 16 N

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3 years ago

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A cell membrane acts as a boundary between the cell and its external environment. What is another role of the cell membrane?

Naddika [18.5K]

The answer is D, it controls what comes in & out the cell, well i hope so!

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2 years ago

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Which of the following is NOT a chemical reaction?

Damm [24]

Ice melting from water. Nothing has changed except the state of matter.

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3 years ago

A gaseous mixture composed of 20% CH4, 30% C2H4, 35% C2H2, and 15% C2H20. What is the average molecular weight of the mixture? a

Semenov [28]

Answer: The correct answer is Option d.

Explanation:

We are given:

Mass percentage of $CH_4$ = 20 %

So, mole fraction of $CH_4$ = 0.2

Mass percentage of $C_2H_4$ = 30 %

So, mole fraction of $C_2H_4$ = 0.3

Mass percentage of $C_2H_2$ = 35 %

So, mole fraction of $C_2H_2$ = 0.35

Mass percentage of $C_2H_2O$ = 15 %

So, mole fraction of $C_2H_2O$ = 0.15

We know that:

Molar mass of $CH_4$ = 16 g/mol

Molar mass of $C_2H_4$ = 28 g/mol

Molar mass of $C_2H_2$ = 26 g/mol

Molar mass of $C_2H_2O$ = 48 g/mol

To calculate the average molecular mass of the mixture, we use the equation:

$\text{Average molecular weight of mixture}=\frac{_{i=1}^n\sum{\chi_im_i}}{n_i}$

where,

$\chi_i$ = mole fractions of i-th species

$m_i$ = molar masses of i-th species

$n_i$ = number of observations

Putting values in above equation:

$\text{Average molecular weight}=\frac{(\chi_{CH_4}\times M_{CH_4})+(\chi_{C_2H_4}\times M_{C_2H_4})+(\chi_{C_2H_2}\times M_{C_2H_2})+(\chi_{C_2H_2O}\times M_{C_2H_2O})}{4}$

$\text{Average molecular weight of mixture}=\frac{(0.20\times 16)+(0.30\times 28)+(0.35\times 26)+(0.15\times 42)}{4}\\\\\text{Average molecular weight of mixture}=6.75$

Hence, the correct answer is Option d.

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3 years ago

How might society have been most likely impacted if Nikola Tesla, the inventor of AC technology, had not become a scientist?

Nonamiya [84]

Cars might not be as insulated and as safe because of the need to get cooler air into the vehicle, and im not fully sure but refrigerators would still run on ice to cool food. Houses wouldnt be as insulated from heat so when winter came around you would be colder than normal

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3 years ago

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