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2 years ago

CAN SOMEONE PLEASE HELP!

Chemistry

2 answers:

Paha777 [63]2 years ago

7 0

They break apart into ions as they dissolve into solutions

katrin [286]2 years ago

3 0

Answer:C

Explanation: they break apart into ions as they dissolve into solution this process is known as dissociation.

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How many protons , neutrons and electrons are in an atom of magnesium-24?

Minchanka [31]

Here is your answer:

Theirs 12 protons, 12 electrons, and 14 neutrons!

Reason: When you look at the atomic number for any element on the table with all of the elements that's how many protons, and electrons their are in the substance (or element) you find how many neutrons by rounding the number under the atomic number which will equal 14!

Your answer is 12:12:14

8 0

3 years ago

Haley recorded several notes in her lab journal about the experiment. Which of her notes below is an interpretation of the data

KiRa [710]

Answer:

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Explanation:

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2 years ago

0.100 mol of CaCO3 and 0.100 mol CaO are placed in an 10.0 L evacuated container and heated to 385 K. When equilibrium is reache

HACTEHA [7]

Answer:

12.531 grams will be the final mass of calcium carbonate.

Explanation:

$CaCO_3(s)\rightleftharpoons CaO(s)+CO_2(g)$

Partial pressure of carbon dioxide gas at equilibrium = $P=0.220 atm$

Volume of carbon dioxide gas = V = 10.0 L

Moles of carbon dioxide gas formed = n

Temperature of the gas = T = 385 K

$PV=nRT$ ( ideal gas equation)

$n=\frac{PV}{RT}=\frac{0.220 atm\times 10.0 L}{0.0821 atm L/mol K\times 385 K}=0.06960 mol$

According to reaction , 1 mole of carbon dioxide gas is formed from 1 mole of calcium carbonate,0.06960 mole of carbon dioxide gas will be obtained from :

$\frac{1}{1}\times 0.06960 mol=0.06960 mol$ calcium carbonate

Moles of calcium carbonate at equilibrium = 0.100 mol - 0.06960 mol = 0.03040 mol

After addition of 0.300 atm of carbon dioxide gas, more amount of calcium carbonate will be be formed.

Here, at the same temperature, the equilibrium pressure of the carbon dioxide gas is 0.220 atm so, entire 0.300 atm of carbon dioxide will get convert to calcium carbonate.

So amount moles of carbon dioxide gas added = moles of calcium carbonate formed after re-establishment of an equilibrium :

Partial pressure of carbon dioxide gas added at equilibrium = $P=0.300 atm$

Volume of carbon dioxide gas = V = 10.0 L

Moles of carbon dioxide gas formed = n

Temperature of the gas = T = 385 K

$PV=nRT$ ( ideal gas equation)

$n=\frac{PV}{RT}=\frac{0.300 atm\times 10.0 L}{0.0821 atm L/mol K\times 385 K}=0.09491 mol$

Moles of calcium carbonate = 0.09491 mol

Total moles of calcium carbonate in the container :

=0.03040 mol + 0.09491 mol = 0.12531 mol

Mass of 0.12531 moles of calcium carbonate :

0.12531 mol × 100 g/mol = 12.531 g

12.531 grams will be the final mass of calcium carbonate.

4 0

3 years ago

The oxygen atom in a water molecule A is electrically neutral. B carries a negative electrical charge. C carries a positive elec

Klio2033 [76]

Answer: The oxygen atom in a water molecule carries a negative electrical charge.

Explanation:

A polar covalent bond is defined as the bond which is formed when there is a difference of electronegativities between the atoms.

Hydrogen bonding (H-bonding) is an intermolecular force having partial ionic-covalent character. H-bonding takes place between a hydrogen atom (attached with an electronegative atom e.g. O, N and F) and an electronegative atom (O,N and F).

In , $H_2O$ , O is a highly electronegative atom attached to a H atom through a covalent bond. Therefore O atom gets partial negative charge and H atoms get partial positive charge.

7 0

3 years ago

Please help me!!!!!!!!

Semmy [17]

Surface runoff, its quite obvious in the picture

3 0

3 years ago