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Vlada [557]
2 years ago
15

Witch type of force is a contact force

Chemistry
2 answers:
ANEK [815]2 years ago
5 0

Answer:

C. Friction

Explanation:

Because friction needs contact to occur, the other forces do not require contact like friction does.

Oksanka [162]2 years ago
4 0

Answer: D

Explanation:

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Colligative properties depend on the amount of solute dissolved in a solvent. These set of properties do not depend on the type of species present. These properties include freezing point depression, boiling point elevation, osmotic pressure and vapor pressure lowering.
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Consider the following equilibrium: 4KO2(s) + 2H2O(g) 4KOH(s) + 3O2(g) Which of the following is a correct equilibrium expressio
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To be able to write correctly the equilibrium expression of a reaction, we need to know the balanced reaction and the phases of the substances in the reaction. When substances are solid, pure liquid they are not included in the expression. We do as follows:

<span>4KO2(s) + 2H2O(g) = 4KOH(s) + 3O2(g)

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Which part of an atom is actively exchanged or shared in a chemical bond?
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An unknown compound contains 38.7 % calcium, 19.9 % phosphorus and 41.2 % oxygen. what is the empirical formula of this compound
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The amount per 100 g is:

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19.9 % phosphorus = 19.9g P / 100g compound = 19.9g

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The molar amounts of calcium, phosphorus and oxygen in 100g sample are calculated by dividing each element’s mass by its molar mass:

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P = 19.9/30.97 = 0.64

O = 41.2/15.99 = 2.57

C0efficients for the tentative empirical formula are derived by dividing each molar amount by the lesser value that is 0.64 and in this case, after that multiply wih 2.

Ca = 0.96 / 0.64 = 1.5=1.5 x 2 = 3

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