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Chemistry

2 answers:

labwork [276]3 years ago

8 0

The warm air rises and the cold air sinks.

Sliva [168]3 years ago

4 0

The answer is A warm air rises cool air sinks

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How can chemical changes affect the environment?

IRINA_888 [86]

because it makes the environment to be present with chemical bonds

7 0

3 years ago

Concentration of Cl ion of 72.24g NaCl in .862 L solution

Nady [450]

Answer:

$Molarity_{Cl^-}=1.434\ M$

Explanation:

Moles of NaCl :

Given, Mass of NaCl = 72.24 g

Molar mass of NaCl = 58.44 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$Moles= \frac{72.24\ g}{58.44\ g/mol}$

$Moles\ of\ NaCl= 1.2361\ mol$

NaCl is a strong salt. So, moles of chloride ion = 1.2361 moles

Volume = 0.862 L

$Molarity=\frac{Moles\ of\ solute}{Volume\ of\ the\ solution}$

$Molarity_{Cl^-}=\frac{1.2361}{0.862}$

$Molarity_{Cl^-}=1.434\ M$

7 0

3 years ago

Which formula represents a polar molecule?<br> (1) O2 <br> (2) CO2 <br> (3) NH3<br> (4) CH4

lara [203]

Answer: Option (3) is the correct answer.

Explanation:

A molecule is polar when the net dipole moment of molecule is zero. When an electronegative atom is attached to an electropositive atom then the electronegative atom pulls the shared pair of electrons more towards itself.

As a result, the movement of electrons is more towards the electronegative atom and the dipole moment becomes zero. This will also induce partial positive and partial negative charge on electropositive and electronegative atom.

On the other hand, $O_{2}, CO_{2}, and CH_{4}$ are covalent compounds and does not have a net zero dipole moment.