Think about a neutral magnesium atom.Then think of a magnesium ion with a 2+charge.How are they different?

1 answer:

6 0

A neutral atom has no added/missing electrons, it's simply neutral. A +2 however signifies something, what do you believe it means in terms of added/subtracted electrons?

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On number 5 I am really stuck can I have help please.

zmey [24]

Answer to this question is absorbed

5 0

3 years ago

For hydrated copper (II) sulfate calculate the mass percentage of water in your hydrated crystals.

nikitadnepr [17]

Answer:

56.44 %

Explanation:

The formula of copper(II) sulfate pentahydrate is $CuSO_4\cdot 5H_2O$ .

In order to calculate the mass percentage of water in it, we may assume that we have 1 mol of copper(II) sulfate pentahydrate. In general, the mass percentage is a ratio between the mass of a component and the total mass of the compound expressed in percent:

$\omega = \frac{m_c}{m_t}\cdot 100 \%$

Since we're taking 1 mole of a substance here, we may state that the mass percentage of water will be calculating using molar masses instead:

$\omega_{H_2O} = \frac{5M_{H_2O}}{M_{CuSO_4\cdot 5 H_2O}}\cdot 100 \%$

Notice that we take 5 molar masses of water, as 1 mole of copper(II) sulfate pentahydrate contains 5 moles of water molecules, then:

$\omega_{H_2O} = \frac{5\cdot 18.016 g/mol}{159.609 g/mol}\cdot 100 \% = 56.44 \%$

6 0

3 years ago

Which element in period 4 would have chemical properties similar to magnesium? 7. which metalloids would have chemical propertie

azamat

The only solution you'll need to have for this problem is a periodic table. The columns in the table are called groups, and they are number from the left to the right starting with 1. The rows in the table are called periods which are numbered from the top to bottom starting with 1.

6. Elements that belong to the same group portray similar chemical properties. Therefore, the element in period 4 which is also in group 2 is Calcium (Ca).

7. The elements that are striked through with the red slanting lines are the metalloids. All the elements to the left of the metalloids are metals. All the elements to the right are nonmetals. Bromine has a symbol of Br. Since At is a metalloid and located in the same group with Br, the answer is Astatine (At).

8. Tin has the chemical symbol of Sn. The nonmetal that is located in the same group is Carbon (C).

9. All the elements in period 6 would have similar properties. The answers could be: Phosphorus (P), Arsenic (As), Antimony (Sb) and Bismuth (Bi).

10. Period is row 1 and group 18 is the last column. The answer is Helium (He).