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3 years ago

The atomic number tells the number of

2 answers:

5 0

The atomic number refers to tell if the number has the amount of protons for a nucleus in an atom. This is shown that the chemical effects of an element has in its singular form in the periodic table

xxMikexx [17]3 years ago

4 0

Answer:

atomic number tells us the number of proton , the atom consists of, for eg. hydrogen has 1 proton and hence it's atomic number is 1

our modern periodic table is arranged on the basis of atomic number as well.

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How many molecules are present in 265 moles of CCl

Solnce55 [7]

Answer:

Option C. 1.60x10^26 molecules

Explanation:

Avogadro's hypothesis proved that that 1 mole of any substance contains 6.02x10^23 molecules.

From the above, we understood that 1 mole of CCl4 contains 6.02x10^23 molecules.

If 1 mole of CCl4 contains 6.02x10^23 molecules,

then, 265 moles of CCl4 will contain = 265 x 6.02x10^23 = 1.60x10^26 molecules

From the calculation made above, 265 moles of CCl4 contains 1.60x10^26 molecules.

5 0

3 years ago

Two identical containers, one red and one yellow, are inflated with different gases at the same volume and pressure. Both contai

Evgen [1.6K]

Answer:

Explanation:

Here we're dealing with the root mean square velocity of gases. We'll provide the formula in order to calculate the root mean square velocity of a gas:

$v_{rms}=\sqrt{\frac{3RT}{M}}$

Here:

$R = 8.314 \frac{J}{K mol}$ is the ideal gas law constant;

$T$ is the absolute temperature in K;

$M$ is the molar mass of a compound in kg/mol.

We know that the gas from the red container is 4 times faster, as it takes 4 times as long for the yellow container to leak out, this means:

$\frac{v_{rms, red}}{v_{rms, yellow}} = 4$

We also know that the temperature of the red container is twice as large:

$\frac{T_{red}}{T_{yellow}} = 2$

Write the ratio of the velocities and substitute the variables:

$\frac{v_{rms, red}}{v_{rms, yellow}}=\frac{\sqrt{\frac{3RT_{red}}{M_{red}}}}{\sqrt{\frac{3RT_{yellow}}{M_{yellow}}}}=4$

Then:

$\frac{\sqrt{\frac{3RT_{red}}{M_{red}}}}{\sqrt{\frac{3RT_{yellow}}{M_{yellow}}}}=\sqrt{\frac{3RT_{red}}{M_{red}}\cdot \frac{M_{yellow}}{3RT_{yellow}}}=\sqrt{\frac{T_{red}}{T_{yellow}}\cdot \frac{M_{yellow}}{M_{red}}}=4$

From here:

$16 = \frac{T_{red}}{T_{yellow}}\cdot \frac{M_{yellow}}{M_{red}}$

Then:

$\frac{M_{yellow}}{M_{red}} = \frac{16}{\frac{T_{red}}{T_{yellow}}} = \frac{16}{2} = 8$

5 0

3 years ago

What is the oxidation number of the chromium atom in Li2Cr2O7?

DanielleElmas [232]

I believe the answer is 2

5 0

4 years ago

A sample of metal has a mass of 21.35 g, and a volume of 6.28 mL. What is the density of this metal?

Scilla [17]

Answer:

3.40g/mL

Explanation:

Density is a measure of mass over volume, so to get the density all we have to do is divide the mass by the volume.

21.35g ÷ 6.28 mL = 3.40g/mL

5 0

3 years ago

Which is a physical property of milk?

OleMash [197]

Answer:

Milk boils at about 212°F (100°C).

Explanation:

The boiling point is a physical property of every matter. Physical properties tell us what a substance is when no change is occuring to its constituents. Such properties can be observed with our senses or instruments or pieces of apparatus.

Some examples of physical properties are colour, taste, odour, hardness, texture, solubility in water.

They all depict what typifies a matter when no change whatever is imparted on them.

4 0

3 years ago