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Xelga [282]
3 years ago
7

How many valence electrons do the halogens have

Chemistry
1 answer:
gladu [14]3 years ago
7 0
8 they have eight :))))))))
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How much energy is required to convert 100.0 g of water completely<br> to steam?
Brrunno [24]

Answer:

<u>225.6 kJ</u>, <em>assuming the water is already at 100 °C</em>

Explanation:

The correct answer to this question will depend on the initial temperature of the water to which heat is added to produce steam.  Energy is required to raise the water temperature to 100°C.  At that point, an energy of vaporization is needed to convert liquid water at 100 °C to water vapor at 100°C.  The heat of vaporization for water is 2256.4 kJ/kg.  The energy required to bring 100g of water from a lower temperature to 100°C is calculated at 4.186 J/g°C.  We don't know the starting temperature, so this step cannot be calculated.

<em><u>Assuming</u></em> that we are already at 100 °C, we can calculate the heat required for vaporization:

(100.0g)(1000.0g/1 kg)(2256.4 kJ/kg) = 225.6 kJ for 100 grams water.

3 0
2 years ago
What is formed when 2 non metals reacts?
ryzh [129]

Answer:

A) covalent bond

Explanation:

Covalent bonding generally happens between nonmetals.

4 0
3 years ago
When a metal bonds with a nonmetal, the bond that is formed is a(n) ___.
bekas [8.4K]
Ionic Bond, which is the transfer of electrons of a metal to a non-metal. 
5 0
3 years ago
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How many sulfur atoms are there in 3.90 mol of sulfur?
Ilya [14]
 <span>In a mole of anything, there are 6.023 x 10^23 units. So, in 3.9 moles of sulfur, there are 3.9 * 6.023 x 10^23 = 23 x 10^23 = 2.3 x 10^24 atoms (keeping only 2 sig figs).  Hope I help!!
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6 0
3 years ago
What two substances are always produced by a neutralization reaction?
satela [25.4K]
What two substances are always produced by a neutralization reaction? water and salt
8 0
2 years ago
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