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krok68 [10]
2 years ago
14

1 Write the chemical symbols for following elements: Nitrogen-

Chemistry
1 answer:
andreev551 [17]2 years ago
8 0

Answer:

Look below

Explanation:

Nitrogen: N

Phosphorus: P

Bromine: Br

Zinc: Zn

Potassium: K

Magnesium: Mg

Hope this helps(would be very grateful if you mark this answer branliest bc i need for lvl up)

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Which of the following compounds is a gas at room temperature? A : CH3CH2OH B : CH3CH2CH2CH2CH2CH2CH3 C : CH3CH2CH3 D : HOCH2CH2
attashe74 [19]

Answer:

C. CH_3CH_2CH_3

Explanation:

Molecules with the stronger intermolecular forces are pulled tightly together  to form solid at higher temperatures and that's why the freezing point is higher.

Also, molecules with the stronger intermolecular force have greater interaction between the molecules and thus on heating do not boil easily and have high boiling point also.

Thus, melting point and boiling point increases with increase in number of carbon atoms and also increase in intermolecular forces (like hydrogen bonding, if present).

Thus, the compound which is gas at room temperature is CH_3CH_2CH_3 <u>because it has least number of carbon atoms and absence of hydrogen bonding.</u>

<u></u>

8 0
3 years ago
A gas effuses 1.55 times faster than propane (C3H8)at the
stepladder [879]

Answer:  The mass of the gas is 18.3 g/mol.

Explanation:

To calculate the rate of diffusion of gas, we use Graham's Law.

This law states that the rate of effusion or diffusion of gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows:

\text{Rate of diffusion}\propto \frac{1}{\sqrt{\text{Molar mass of the gas}}}

\frac{Rate_{X}}{Rate_{C_3H_8}}=1.55

\frac{Rate_{X}}{Rate_{C_3H_8}}=\sqrt{\frac{M_{C_3H_8}}{M_{X}}}

1.55=\sqrt{\frac{44}{M_{X}}

Squaring both sides and solving for M_{X}

M_{X}=18.3g/mol

Hence, the molar mas of unknown gas is 18.3 g/mol.

5 0
3 years ago
Read 2 more answers
The recommended calcium intake for teenagers is 1300mg per day. A glass of milk contains 305mg of calcium. One glass contains a
aalyn [17]

305 x 4 = 1220.

1/4 of 304 = 76.

1220 + 76 = 1296.

You'd need approximately 4 and 1/4 of glasses of milk to get the recommended calcium intake for teenagers.

8 0
3 years ago
The half-life of the radioactive isotope magnesium-20 is 0.600 seconds.
Afina-wow [57]

It will take less 1.8 seconds for the mass of a sample of magnesium-20 to decay from 65.6 micrograms to 8.20 micrograms.

<h3>What is Half-Life of radioactive a radioactive substance?</h3>

The half-life of a radioactive element is the time for half the amount of a sample of the substance to decay.

After 0.6 seconds 31.25 remains

After 1.2 seconds, 15.625 remains

After 1.8 seconds, 7.9 micrograms remains.

In conclusion, it will take less 1.8 seconds for the sample to decay to 8.20 micrograms.

Learn more about Half-Life at: brainly.com/question/2320811

#SPJ1

3 0
1 year ago
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What is the molarity of ammonia if it is 1.0 ionized?
alexandr402 [8]

Answer:

A (0.0018 M

Explanation:

Ammonia is very strong but it is good to use around the house because if u have bugs or anything that's the same stuff to use for it

3 0
3 years ago
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