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EastWind [94]
3 years ago
14

What is a force is needed to stop a child form slipping on ice

Chemistry
1 answer:
Ludmilka [50]3 years ago
6 0

Answer:

Friction. Hope I helped.

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How many moles of water can be obtained from the reaction of 4 moles of O2?
Yuliya22 [10]

Answer: 8moles

Explanation:

The reaction below shows the formation of 2 moles of water from 2 moles of hydrogen and 1 mole of oxygen respectively.

2H2(g) + O2 (g) --> 2H2O(l)

So, if 1 mole of O2 produce 2 mole of H2O

4 moles of O2 will produce Z mole of H2O

To get the value of Z, cross multiply

1 x Z = 4 x 2

Z = 8

So, the equation will be 8H2(g) + 4O2 (g) --> 8H2O(l)

Thus, 4 moles of O2 will produce 8moles of H2O .

6 0
3 years ago
Some fertilizer blends contain magnesium nitrate (MgNO3). Suppose that a chemist has 1.24 liters of a 2.13 M solution of magnesi
tamaranim1 [39]

Initial concentration of magnesium nitrate M1 = 2.13 M

Initial volume of magnesium nitrate, MgNO3  V1 = 1.24 L

Final concentration of MgNO3, M2 = 1.60 M

Let the final volume of MgNO3 upon dilution be V2

Formula to use:

M1*V1 = M2*V2

V2 = M1*V1/M2

      = 2.13 M * 1.24 L/1.60 M = 1.65 L

Thus, the final volume of magnesium nitrate solution upon dilution is 1.65 L

7 0
3 years ago
Read 2 more answers
If an element has 3 valance electrons what row is it in?
klemol [59]

It can be any row

Explanation:

An element with a valence electrons of 3 can be in any row on the periodic table.

The rows are the horizontal arrangement of elements on the periodic table.

Elements on the same row have the same energy level.

  • The periodic table rows are called periods.
  • It is only in the groups that we can find such element.
  • Group 3 elements have 3 valence electrons.
  • Since this group cuts through all the rows, therefore, elements with 3 valence electrons can be found in any row.

learn more:

Metalloids brainly.com/question/3023499

#learnwithBrainly

8 0
3 years ago
Answer the following question about steriochemistry.
algol13

Answer:

b is the answer

Explanation:

5 0
3 years ago
a 143.1 g sample of a compound contains 53.4 g of carbon, 16.9 g of hydrogen, 43 g of nitrogen, and some amount of oxygen. what
Alex Ar [27]
Mass of oxygen = 143,1g - (53,4g + 16,9g + 43g) = 29,8g

If 143,1g ------ is ------ 100%
                       so
   29,8g  ------- is ------ %O

%O = (29,8g*100%) / 143,1g = 20,82%
3 0
3 years ago
Read 2 more answers
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