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Scrat [10]
3 years ago
10

As

Chemistry
2 answers:
FinnZ [79.3K]3 years ago
6 0

Answer:

A B D

Explanation:

<h2>PLS MARK AS BRAINLY</h2>
Mars2501 [29]3 years ago
4 0

Explanation:

  1. area of rectangle=l×b
  • 15=5×b
  • b=3cm

2.area of rectangle=l×b

  • 28=l×4
  • l=7cm

3. perimeter of square=4×L

  • 24=4×L
  • L=6cm

4. perimeter of rectangle=2(L+b)

  • 14=2(4+b)
  • 14=8+2b
  • 2b=6
  • b=3cm

hope it helps.

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What will be the number of atoms in 0.750 gram of Fe
expeople1 [14]

Answer:

8.085x10²¹ atoms

Explanation:

Atomic mass of Fe = 55.845 g/mol

it means ,

1 mole Fe = 55.845 g

1 mole = 6.02x10²³  atoms

so,

55.845g Fe has = 6.02x10²³ atoms

∴0.750 g  Fe has = {(6.02x10²³ x 0.750)/55.84} atoms

                             =8.085x10²¹ atoms

3 0
4 years ago
When ammonium nitrate is added to a suspension of magnesium hydroxide in water, the Mg(OH)2 dissolves. Write a net ionic equatio
Viefleur [7K]

Answer:

Net ionic: Mg(OH)_{2}+2NH_{4}^{+}\rightarrow Mg^{2+}+2NH_{3}+2H_{2}O

Explanation:

OH^{-} in Mg(OH)_{2} reacts with NH_{4}^{+} to form NH_{3} and H_{2}O.

Due to this acid-base reaction, Mg(OH)_{2} become soluble whenever NH_{4}NO_{3} is added to suspension of Mg(OH)_{2}.

In this reaction, NH_{4}NO_{3} acts as an acid and Mg(OH)_{2} acts as a base.

Molecular equation: Mg(OH)_{2}+2NH_{4}NO_{3}\rightarrow Mg(NO_{3})_{2}+2NH_{3}+2H_{2}O

Total ionic: Mg(OH)_{2}+2NH_{4}^{+}+2NO_{3}^{-}\rightarrow Mg^{2+}+2NO_{3}^{-}+2NH_{3}+2H_{2}O

Net ionic: Mg(OH)_{2}+2NH_{4}^{+}\rightarrow Mg^{2+}+2NH_{3}+2H_{2}O

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Lostsunrise [7]
All of the above is the correct answer
3 0
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Explanation:

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8 0
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There are 3 types of electron pairs present in a molecular shape: bond pair -bond pair, lone pair - bond pair, lone pair - lone pair.

Strength of repulsions between these three types of pair follows the order:

lone pair- lone pair > lone pair - bond pair > bond pair - bond pair

Whenever there is an addition of lone pairs to the geometry, some distortions take place which decreases the bond angles and some asymmetry is attained in the original molecular shape.

4 0
3 years ago
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