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3 years ago

Why is it difficult to classify dissolving as simply a physical or a chemical change?

1 answer:

6 0

Dissolving an ionic compound is a chemical change. In contrast, dissolving sugar or another covalent compound is a physical change because chemical bonds are not broken and new products are not formed .Dissolving a solid in liquid, such as table salt in water, is a physical change because only the state of the matter has changed. Physical changes can often be reversed. ... It has not combined with the water to cause a chemical reaction

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The equation shows the reaction between zinc metal and hydrochloric acid.

liq [111]

The balanced chemical reaction is written as:

Zn(s) + 2HCl(aq) = ZnCl2(aq) + H2(g)

We are given the amount of the reactant zinc to be used in the reaction This amount would be the starting point for the calculation. It is as follows:

5.00 mol Zn ( 1 mol H2 / 1 mol Zn ) (2.02 g H2 / 1 mol H2 ) = 10.1 g H2

Therefore, the correct answer is the second option.

8 0

4 years ago

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jolli1 [7]

Answer:

0.83 g

Explanation:

Step 1: Write the balanced equation

Fe + CuSO₄ ⇒ Cu + FeSO₄

Step 2: Calculate the moles corresponding to 0.75 g of Fe

The molar mass of Fe is 55.85 g/mol.

$0.75g \times \frac{1mol}{55.85g} = 0.013 mol$

Step 3: Calculate the moles of Cu produced from 0.013 moles of Fe

The molar ratio of Fe to Cu is 1:1. The moles of Cu produced are 1/1 × 0.013 mol = 0.013 mol.

Step 4: Calculate the mass corresponding to 0.013 moles of Cu

The molar mass of Cu is 63.55 g/mol.

$0.013mol \times \frac{63.55g}{mol} = 0.83 g$

4 0

4 years ago

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21. A piece of metal with a a mass of 15.2 g is heated from 17°C to 42°C. In the process it absorbs 1362 J of

Sholpan [36]

Answer:

3.58J/g°C is the specific heat of the metal

Explanation:

The specific heat of a material is defined as the energy that 1g of the material absorbs and produce the increasing in temperature in 1°C. The equation is:

Q = S*ΔT*m

Where Q is energy = 1362J

S is specific heat of the material

ΔT is change in temperature = 42°C - 17°C = 25°C

And m is the mass of the material = 15.2g

Replacing:

S = Q / ΔT*m

S = 1362J / 25°C*15.2g

<h3>3.58J/g°C is the specific heat of the metal</h3>

4 0

3 years ago

The measurement 4.06 x 10^-5g represents:

Hitman42 [59]

The measurement 4.06 x 10^-5g represents: 0.0000406 g

8 0

3 years ago

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Which statement best describes a physical change?

Inga [223]

Answer: 3 Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same

Explanation:

Physical change mainly physical properties of a substance while the chemical changes remain unchanged. Once there is a change to the chemistry of the substance, this would be classified as a chemical change.

8 0

3 years ago

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