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3 years ago

At a recycling plant, old tin cans are melted down and reconstructed. This is an example of a _____

Chemistry

2 answers:

Len [333]3 years ago

5 0

Answer:

Physical change

Explanation:

Different types of changes take place. Two such changes are physical change and chemical change.

Physical change

This takes place when a substance changes from one state to another without changing the chemical composition. For example, water changes from liquid to solid (ice) when frozen. Thus, water has not changed its chemical properties. A physical change is reversible.

Thus, the melting of aluminium cans is a physical change.

Chemical change

This is a reaction that changes the original reactants to give different products. For example, burning coal gives ash, soot, carbon dioxide and water. Most chemical reactions are irreversible.

lina2011 [118]3 years ago

3 0

A change from physical change into chemical change not sure hope this helps

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The concentration of solution in M or mol/L can be calculated using the following formula:

$C=\frac{n}{V}$ .... (1)

Here, n is number of moles and V is volume of solution in L.

The molecular formula of potassium sulfate is $K_{2}SO_{4}$ thus, there are 2 moles of potassium in 1 mol of potassium sulfate.

1 mol of potassium will be there in 0.5 mol of potassium sulfate.

Mass of potassium is 4.15 g, molar mass is 39.1 g/mol.

Number of moles can be calculated as follows:

$n=\frac{m}{M}$

Here, m is mass and M is molar mass

Putting the values,

$n=\frac{(4.15 g}{(39.1 g/mol}=0.1061 mol$

Thus, number of moles of $K_{2}SO_{4}$ will be $0.1061\times 0.5=0.053 mol$ .

The volume of solution is 225 mL, converting this into L,

$1 mL=10^{-3}L$

Thus,

$225 mL=0.225 L$

Putting the values in equation (1),

$C=\frac{(0.053 mol}{0.225 L}=0.236 M$

Therefore, concentration of potassium sulfate solution is 0.236 M.

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