Based on the Arrhenius theory, when potassiumhydroxide dissolves in water, the only negative
ion in the aqueous solution is
(1) O2 (aq) (3) H (aq)
(2) OH2 (aq) (4) OH (aq)

Answers

Answer 1

Answer:

Answer : The correct option is, (4) $OH^-(aq)$ .

Explanation :

According to the Arrhenius theory, an acid is a substance that ionizes in water to gives $H^+$ ions (hydronium ions or hydrogen ions) and a base is a substance which ionizes in water to gives $OH^-$ ions (hydroxide ions).

As we know that when the potassium hydroxide (KOH) dissolves in water or ionizes in water to gives $OH^-$ ions (hydroxide ions) and $K^+$ ions (potassium ion). That means $OH^-$ ion is a negative ion in aqueous solution and $K^+$ ions is a positive ion in aqueous solution.

Hence, the correct option is, (4) $OH^-(aq)$ .

Answer 2

Answer: (4) $OH^(-)$ (aq)

That's the answer.

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Kinetic energy is _____.inversely proportional to mass and velocity
directly proportional to mass and velocity
directly proportional to mass and inversely proportional to velocity
inversely proportional to mass and directly proportional to velocity

Answers

Kinetic energy is DIRECTLY PROPORTIONAL TO MASS AND VELOCITY.

The formula for finding kinetic energy is: KE = MV^2 /2, Where:

KE = Kinetic energy

M = Mass of the object

V = Velocity of the object;

The mathematical relationship given above shows that, kinetic energy is directly proportional to mass and also directly proportional to the square of velocity of an object. This implies that, the higher the mass and the velocity of an object, the higher the kinetic energy that it will possess. The reverse is also true, the lower the mass and the velocity of an object, the lower its kinetic energy.

Kinetic energy is given by, K.E =mv^2/2. So it's directly proportional to mass and velocity.

A student needs .575 moles of sodium chloride for an experiment. how many grams she she mass out

Answers

The molecular weight of NaCl is 58.44 g/mol.
0.575 mol * 58.44 g/mol = 33.6 grams of NaCl

What is the main factor that determines if a star will become a black hole

Answers

As a star runs out of fuel it can expand and will begin to form heavier elements such as carbon and iron (most of the matter in our solar system comes from extra-solar sources). Once it finally exhausts all of its fuel it will begin to collapse. It is here that the stars begin to undergo different fates.

What does the molecular formula of a compound describe?

Answers

Answer: Molecular Formulas. Molecular formulas are a compact chemical notation that describe the type and number of atoms in a single molecule of a compound. Identify the molecular formula of a compound given either its name or structural formula.

Explanation:

when 200 grams of water cools from 50 c to 25 c the total amount of heat energy released by the water is?

Answers

Answer : The heat released by the eater is, $2.1* 10^4J$ [/tex]

Explanation :

Formula used :

$Q=m* c* \Delta T$

or,

$Q=m* c* (T_2-T_1)$

where,

Q = heat released = ?

m = mass of water = 200 g

c = specific heat of water = $4.184J/g^oC$

$T_1$ = initial temperature = $50^oC$

$T_2$ = final temperature = $25^oC$

Now put all the given value in the above formula, we get:

$Q=200g* 4.184J/g^oC* (25-50)^oC$

$Q=20920J=2.1* 10^4J$ [/tex]

Therefore, the heat released by the eater is, $2.1* 10^4J$ [/tex]

Specific Heat:
Heat Energy= Mass of substance X Specific Heat X Change in Temp.
1. change in temp |50-25| = 25
2. specific heat of Water(H2O) = cal/g (Celsius) 1.000
heat energy= 200g X 1.000 X 25
Heat energy = 5000cal

Which type of energy is generated due to the movement of charged particles?nuclear energy
chemical energy
electrical energy
mechanical energy