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4 years ago

Help me pls Idk the answers

Chemistry

2 answers:

gayaneshka [121]4 years ago

5 0

I’m very sorry but I don’t know how to answer that question.

Rashid [163]4 years ago

4 0

Answer:

It goes grain of salt water molecule human skin cell then E coli bacteria

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Write the name for the following molecular compounds. Remember to use the correct prefix for each compound.

Westkost [7]

Answer:

Hey there!

CS2) Carbon Disulfide.

PBr3) Phosphorus Tribromide

NO) Nitric Oxide

CF4) Carbon Tetrafluoride

P2O5) Phosphorus Pentoxide

Let me know if this helps :)

3 0

3 years ago

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

blondinia [14]

Answer: The correct answer is Option c.

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 c.

3 0

3 years ago

How are a sodium atom and a sodium ion alike?

grigory [225]

They are not allike as na atom has 11 elctrons and Na ion has 10 electons. They both have the same nucleus (same number of protons and neutrons). The only difference is that the ion has one less electron than the atom (in this case).

3 0

3 years ago

Which of the following is a strong base? a. h2o b. NH3 c.CaCo3 d. NaOh

hichkok12 [17]

Answer:

d. naoh

Explanation:

4 0

3 years ago

What happens to the mass when a substance changes states

Norma-Jean [14]

If the the level of water in a container is compared before and after the fusion, it can be realized that the ice has a higher level than that of liquid water: solid and liquid water does not have the same volume.
We can generalize:
A state change always causes a change in volume.
Comment:
Water is an exception, volume increases during a melting for most of substances.

8 0

3 years ago