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Kay [80]
3 years ago
14

When components do not combine chemically, it is a _____. compound substance mixture molecule

Chemistry
2 answers:
Inessa05 [86]3 years ago
6 0
Mixture does not combine chemically
Lelu [443]3 years ago
6 0

Answer: Option (c) is the correct answer.

When an atom donates or shares its valence electrons with other atoms then it results in the formation of a new atom. This means a chemical has occurred as the chemical composition of products will be different from the reactants.

Whereas a substance is a matter which contains specific composition with some specific properties.

When two or more substance are mixed together then it is known as a mixture. It is not necessary that substances added will combine with each other.

When atoms of similar element chemically combine together then they result in the formation of a molecule.

For example, Cl + Cl \rightarrow Cl_{2}

Therefore, we can conclude that when components do not combine chemically, it is a mixture.

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Osmosis is the process responsible for carrying nutrients and water from groundwater supplies to the upper parts of trees. The o
Nady [450]

Answer:

0.825 M

Explanation:

The osmotic pressure is a colligative property, that can be calculated using the following expression.

π = M × R × T

where,

π is the osmotic pressure

M is the molarity

R is the ideal gas constant

T is the absolute temperature (24°C + 273 = 297 K)

M = π / R × T = 20.1 atm / (0.08206 atm.L/mol.K) × 297 K = 0.825 M

5 0
3 years ago
HELP<br>12 (a crossword that had 7 spaces)
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3 years ago
What is the ratio of [a–]/[ha] at ph 2.75? the pka of formic acid (methanoic acid, h–cooh) is 3.75?
Varvara68 [4.7K]

The dissociation of formic acid is:

HCOOH \rightleftharpoons HCOO^{-} + H^{+}

The acid dissociation constant of formic acid, k_a is:

k_a = \frac{[HCOO^{-}]  [H^{+}]}{HCOOH}

Rearranging the equation:

\frac{[HCOO^{-}]}{[HCOOH]} = \frac{k_a}{[H_+]}

pH = 2.75

pH = -log[H^{+}]

[H^{+}]= 10^{-2.75} = 1.78 \times 10^{-3}

pk_a = 3.75

k_a = 10^{-3.75} = 1.78\times 10^{-4}

Substituting the values in the equation:

\frac{[HCOO^{-}]}{[HCOOH]} = \frac{k_a}{[H_+]}

\frac{[HCOO^{-}]}{[HCOOH]} = \frac{1.78\times 10^{-4}}{1.78\times 10^{-3}}

Hence, the ratio is \frac{1}{10}.

4 0
3 years ago
HELP THIS IS FOR CHEM!! If the pull force is 898N and the friction force is 335N what is the net force?
Nezavi [6.7K]

Answer:

                                               

Explanation:

                         

                                 

                                             

3 0
3 years ago
35 cm3 of a metal has a mass of 121 grams. whats is its density?
dusya [7]

Answer:

The density of the metal is 3.457 g/cm³.

Explanation:

Given,

mass of metal = 121 grams

Volume = 35 cm³.

Density = ?

Density of the metal can be found by using the formula

Density = Mass/Volume

Substituting the values,

Density = 121/35 = 3.457 g/cm³.

5 0
3 years ago
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