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Alborosie
2 years ago
15

Do you think more energy is released when lightning strikes inside a cloud or when lightning strikes the ground? Use your unders

tanding of electric potential energy to support your answer.
Chemistry
1 answer:
Serhud [2]2 years ago
6 0

Answer:

Which of the following statements about the periodic table is true?

 Elements in the same column are similar in their properties.

 Elements in the same row are similar in their properties.

 Elements that start with the same letter are similar in their properties.

 Elements that have the same atomic mass are similar in their properties.

Explanation:Which of the following statements about the periodic table is true?

 Elements in the same column are similar in their properties.

 Elements in the same row are similar in their properties.

 Elements that start with the same letter are similar in their properties.

 Elements that have the same atomic mass are similar in their properties.

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A 3.82-g sample of magnesium nitride is reacted with 7.73 g of water. mg3n2 (s) + 3 h2o (â) â 2 nh3 (g) + 3 mgo (s) the yield of
horrorfan [7]
The reaction is properly written as

Mg₃N₂ (s) + 3 H₂O (l) --> 2 NH₃<span> (g) + 3 MgO (s) 

Molar mass of Mg</span>₃N₂ = 100.95 g/mol
Molar mass of H₂O = 18 g/mol
Molar mass of MgO = 40.3 g/mol

Moles Mg₃N₂: 3.82/100.95 = 0.0378
Moles H₂O: 7.73/18 = 0.429 

Theo H₂O required for available Mg₃N₂: 0.0378*3/1 = 0.1134 mol
Hence, the limiting reactant is Mg₃N₂.
Thus,

Theoretical Yield = 0.0378 mol Mg₃N₂ * 3 mol MgO/Mg₃N₂ * 40.3 g/mol
Theo Yield = 4.57 g

Percent Yield = Actual Yield/Theo Yield * 100
Percent Yield = 3.60 g/4.57 g * 100 =<em> 78.77%</em>
5 0
3 years ago
QUESTION 5
mrs_skeptik [129]
Answer is b. Hope it help
7 0
3 years ago
Three cards with holes are arranged in a straight line. A light is shined through the first card’s hole and travels through all
igomit [66]
C) that light travels in a straight line.
8 0
4 years ago
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(1)List three things you know about<br> an atom? (2) What is matter created of?
kicyunya [14]

Answer:

Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).

Explanation:

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Starting with acetylene and bromoethane, show how you would use reagents from the table to synthesize 3-hexanone.
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The reaction sequence will be


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