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Serjik [45]
3 years ago
11

What are two systems that use radio waves

Chemistry
1 answer:
Goshia [24]3 years ago
7 0
Mobile radio communication
Broadcasting
Navigation systems
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If you mix salt sand and sugar with water what will the mixture be a suspension or solution
Basile [38]
If you mix salt sand and sugar with water what will the mixture be a solution because both sugar and salt can be diluted until the saturation point
6 0
3 years ago
What is the molarity of a solution composed of 4.73 g of potassium iodide (KI) dissolved in enough water to make 0.169 L of solu
Kazeer [188]

Answer:

[KI] = 0.17 M

Explanation:

We determine the moles of solute:

Mass / Molar mass → 4.73 g / 166 g/mol = 0.0285 moles

Molarity (mol/L) is defined as moles of solute in 1L of solution

It is a sort of concentration

M = 0.0285 mol / 0.169L = 0.17 M

Instead of making the division (mol/L), we can also try this rule of three:

In 0.169 L we have 0.0285 moles of solute

in 1 L we must have ___ (1 . 0.0285) / 0.169 = 0.17 mol/L

4 0
3 years ago
An aqueous solution of acetic acid is found to have the following equilibrium concentrations at 25 C:
yarga [219]

Answer: 1.79 x 10^-5

Explanation: The equilibrium constant of a reaction can be calculated from the quotient of the concentrations of the products over the concentrations of the reactants, with each termed raised to their respective stoichometric coefficients.

For acetic acid, this equilibrium expression is:

Kc=\frac{[H+] [CH3COO-]}{[CH3COOH]}

Replacing the equilibrium concentrations given by the exercise into the expression above, the equilibrium constant, Kc will be obtained and it is found to be equal to 1.79 x 10^-5.

8 0
3 years ago
Read 2 more answers
Which one of the following represents a<br> chemical change?
11111nata11111 [884]
We need options... sorry
5 0
3 years ago
Which of the following would help you identify a titration curve that involved a strong acid titrated by a weak base?
Mariulka [41]

Answer:

The pH at the equivalence point is lower than 7

Explanation:

Given the titration involves a strong acid and a weak base

An example  is the reaction between ammonia  and hydrochloric acid  in the aqueous phase

The pH of the base will ordinarily start high and drop rapidly with the additions of acid. As the equivalence point is approached, the pH will change more gradually, until finally one drop will cause a rapid pH transition through the equivalence point.

If a chemical indicator is used—methyl orange would be a good choice in this case—it changes from its basic to its acidic colour.

In strong acid-weak base titrations, the pH at the equivalence point is not 7 but below it. This is due to the production of a conjugate acid during the titration; it will react with water to produce hydronium ions.

3 0
3 years ago
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