3 years ago

12. Identify the following as a chemical or physical change:

1 answer:

Reika [66]3 years ago

3 0

I think the answer isD,A

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Sveta_85 [38]

C because endangered animals cannot be tested in the scientific method

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Bingel [31]

The chemical equation of this reaction is: Fe + 2HCl -> FeCl2 + H2.

You can see that for 1mol of Fe you get 1mol of FeCl2. So you need 4mol of Fe to make 4mol of FeCl2.

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kompoz [17]

Answer:

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Explanation:

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Otrada [13]

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3 years ago

inn [45]

Answer: The density of the unknown metal is 7.86 g/ml.

Explanation:

Density is defined as the mass contained per unit volume.

$Density=\frac{mass}{Volume}$

Given : Mass of metal = 25.32 g

Volume of metal = volume of water displaced = (28.22 - 25.00) ml = 3.22 ml

Putting in the values we get:

$density=\frac{25.32g}{3.22ml}$

$Density=7.86g/ml$

Thus the density of the unknown metal is 7.86 g/ml

7 0

3 years ago