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3 years ago

The number of protons and neutrons in an atom is known as the

Chemistry

2 answers:

Anna71 [15]3 years ago

7 0

Answer:

Its B. Just look at google.

vekshin13 years ago

7 0

Answer:

The number of protons and neutrons in an atom is known as the mass number. C.)

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Why is plastic a better choice for the slide than aluminum?

siniylev [52]

Answer:

Plastic is better because it doesn't melt in the microwave but aluminum burns in the microwave

Explanation:

7 0

3 years ago

Molarity, is the concentration of a solution expressed in terms of moles solute per liter of solution. What is the molarity of a

pishuonlain [190]

molarity of the CuSO₄ solution = 0.68 moles/L

Explanation:

The formula for molar concentration is:

molar concentration (molarity) = number of moles / solution volume (L)

number of moles = mass / molecular weight

number of moles of CuSO₄ = 12.304 / 159.6

number of moles of CuSO₄ = 0.07709 moles

molar concentration of the CuSO₄ solution = 0.07709 / 0.1127

molar concentration of the CuSO₄ solution = 0.68 moles/L

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3 years ago

Which of these chemical formulas represents both an element and a molecule?

inna [77]

O2.

Because it is only made up of one type of element it is an element. Howevern there is more than one oxygen atom because oxygen cannot exist as a single atom, therefore making it a molecule as well.

8 0

3 years ago

Read 2 more answers

Describe how the properties of the compound carbon monoxide (CO) differ from the properties of the

ElenaW [278]

Explanation:

There is a clear cut difference between a compound and an element:

A compound is made up of substances composed of two or more kinds of atoms or elements joined together in a definite grouping.
An element is a distinct substance that cannot be split-up into simpler substances. These substances are only made up of one kind of atom.

Compounds are formed so that unstable elements can attain stability.

Carbon monoxide is made up two elements: Carbon and oxygen that have combined chemically together.

Carbon monoxide is a toxic gas and it is different from oxygen atom and carbon atom.
Carbon is a solid but carbon monoxide is a gas.
Oxygen atom does not exists on its own but it exists as Oxygen gas O₂
The properties of carbon monoxide clearly differ from that of oxygen and carbon.

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3 years ago

Assuming 54.81 grams of Al are consumed in the presence of excess copper II chloride dihydrate, how many grams of AlCl3 can be p

Alchen [17]

Answer:

181.39g of AlCl3 is produced

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

3CuCl2•2H2O + 2Al → 2AlCl3 + 6H2O + 3Cu

Next, we shall determine the mass of Al that reacted and the mass of AlCl3 produced from the balanced equation. This is illustrated below:

Molar mass of Al = 27g/mol

Mass of Al from the balanced equation = 2 x 27 = 54g

Molar mass of AlCl3 = 27 + (3x35.5) = 133.5g/mol

Mass of AlCl3 from the balanced equation = 2 x 133.5 = 267g

Summary:

From the balanced equation above,

54g of Al reacted to produce 267g of AlCl3.

Next, we shall determine the theoretical yield of AlCl3. This can be achieved as shown below:

From the balanced equation above,

54g of Al reacted to produce 267g of AlCl3.

Therefore, 54.81g of Al will react to produce = (54.81 x 267)/54 = 271.01g of AlCl3.

Therefore, the theoretical yield of AlCl3 is 271.01g.

Finally, we shall determine the actual yield of AlCl3 produced from the reaction.

This can be obtain as follow:

Percentage yield of AlCl3 = 66.93%

Theoretical yield of AlCl3 = 271.01g

Actual yield of AlCl3 =?

Percentage yield = Actual yield/Theoretical yield x 100

66.93% = Actual yield /271.01g

Actual yield = 66.93% x 271.01

Actual yield = 66.93/100 x 271.01g

Actual yield = 181.39g.

Therefore, 181.39g of AlCl3 is produced from the reaction.

8 0

4 years ago