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max2010maxim [7]
4 years ago
8

Gymnasts often practice on foam floors, which increase the collision time when a gymnast falls. What effect does this have on co

llisions?
The change in momentum needed to stop the gymnast is increased.
The change in momentum needed to stop the gymnast is decreased.
The force exerted by the floor on the gymnast decreases.
The force exerted by the floor on the gymnast increases.
Chemistry
1 answer:
Nina [5.8K]4 years ago
8 0
I think that the answer is (D)... I hope this helped

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The compound FeCl3 is made of...
notka56 [123]

The compound FeCl3  is made  of  one atom  and three  atoms  of chlorine


    <u><em>explanation</em></u>

  • FeCl3  is made up of two elements.
  • that is iron  with   Fe chemical symbol  and chlorine with Cl  chemical symbol.
  • There are 3  atoms of chlorine  in FeCl3   because the subscript in front of Cl in FeCl3  is 3.
3 0
3 years ago
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Ammonium perchlorate NH4ClO4 is a powerful solid rocket fuel, used in the Space Shuttle boosters. It decomposes into nitrogen N2
Bas_tet [7]

Answer:

1.3 mol H₂O

Explanation:

Let's consider the decomposition reaction of ammonium perchlorate.

NH₄ClO₄(s) → 1/2 N₂(g) + 1/2 Cl₂(g) + O₂(g) + 2 H₂O(g)

As we can see in the balanced equation, the molar ratio of ammonium perchlorate to water is 1:2. The moles of water produced by the reaction of 2.5 mol of ammonium perchlorate.

2.5 mol NH₄ClO₄ × (2 mol H₂O / 1 mol NH₄ClO₄) = 1.3 mol H₂O

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A company sells a natural medicine with plant ingredients to help treat dementia, a disease in which people have a hard time rem
sammy [17]
I think it is the second one. hope it helps! :)
5 0
4 years ago
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What is the cell wall &amp; the chloroplasts?
adoni [48]

The cell wall is mixed with the cell membrane, the cell wall is outside of the membrane and the cell membrane is letter i which allows materials to pass in and out of the cell.

Chloroplasts are letter k they basically just help the plant use photosynthesis.

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6 0
4 years ago
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Harrizon [31]

Answer:

6.19\times 10^{-3} is the mole fraction of potassium dichromate.

Explanation:

Mass of potassium dichromate = 24.42 g

Moles of  potassium dichromate =n_1=\frac{24.42 g}{294.185 g/mol}=0.0830 mol

Mass of water = 240.0 g

Moles of water =n_2=\frac{240.0 g}{18.015 g/mol}=13.3222 mol

Mole fraction is calculated by:

\chi_1=\frac{n_1}{n_1+n_2}

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6.19\times 10^{-3} is the mole fraction of potassium dichromate.

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