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Bezzdna [24]
3 years ago
5

The elements in group 2 all have _ valence electrons. A.2 4 6 8

Chemistry
2 answers:
Vlada [557]3 years ago
5 0

Answer:

2 valence electrons

Explanation:

JulijaS [17]3 years ago
4 0

Answer:

2 valence electrons,

Explanation:

For example magnesium Mg.

Mg readily loses  the 2 valance electrons to form Mg2+ which combines , for example, with chlorine to form the ionic  compound MgCl2.

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The molar mass of Ca(ClO4)2 is 239.1 g/mol.



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Which of the following cities would most likely expect to see a rise in their temperatures in the next couple of days
blagie [28]

Answer:

A seems correct.

Explanation:

A or D probably

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2 years ago
Determining Molar Mass
alisha [4.7K]

The molar mass of the following compounds in two decimal places are as follows:

  • NH3: 17.04 g/mol
  • Mg(OH)2: 58.33 g/mol
  • Fe2O3: 159.70 g/mol

<h3>MOLAR MASS:</h3>

The molar mass of a compound is the sum of all the atomic masses of the elements that constitutes the compound.

According to this question, three compounds were given as follows: NH3, Mg(OH)2 and Fe2O3.

The atomic mass of the elements in this compounds are as follows:

  • N = 14
  • H = 1
  • Mg = 24
  • O = 16
  • Fe = 56

  1. The molar mass of NH3 = 14 + 3 = 17g/mol
  2. The molar mass of Mg(OH)2 = 24 + 32 + 2 = 58g/mol
  3. The molar mass of Fe2O3 = 56(2) + 16(3) = 160g/mol

Learn more about molar mass at: brainly.com/question/12127540

6 0
2 years ago
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When table salt (NaCl) is dissolved into water, it breaks into 2 ions, Na+ and Cl-. The water molecules are attracted to them be
eimsori [14]

Answer:

A

Explanation:

According to Coulomb's Law, like charges<u><em> repel </em></u>each other, whereas unlike charges<em><u> attract</u></em> each other. This applies to all charged particles.

When NaCl dissociates into its ions in water, we observe the following ions in the system:

<em>Na+ (positive)</em>

<em>Cl - (negative)</em>

<em>H+ (positive)</em>

<em>OH- (negative)</em>

The only correct option is A where the negatively charged oxygen atoms are attracted to the positively charged sodium atoms.

In option B the charge of the oxygen atom is incorrectly mentioned as positive. In option C, the charge of hydrogen atoms is incorrectly mentioned as negative, and in option D the charges of the atoms are correct, but the pairing is incorrect as like charges repel each other.

<h3>Hope this helps</h3>
3 0
3 years ago
What is a polar bond?
Hoochie [10]

Answer: A polar bond is a covalent bond between two atoms where the electrons forming the bond are unequally distributed. This causes the molecule to have a slight electrical dipole moment where one end is slightly positive and the other is slightly negative

Explanation:

For example like H & CL

5 0
3 years ago
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