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3 years ago

The positive sign of the energy difference in a chemical reaction would indicate that ..........

Chemistry

1 answer:

trasher [3.6K]3 years ago

3 0

Answer:

B) the chemicals are gaining energy from the surroundings.

Explanation:

The positive sign of the energy difference in a chemical reaction would indicate that the chemicals are gaining energy from the surroundings. This is what happens in an endothermic reaction.

In an endothermic reaction, heat is absorbed from the surroundings hence the surrounding becomes colder at the end of the changes.

Here the energy change is assigned a positive value.
This is because the heat energy level of the final state is higher than that of the initial state.
So, the difference gives a positive value.

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A saturated solution of manganese(II) hydroxide was prepared, and an acid–base titration was performed to determine its KspKsp a

trapecia [35]

Answer:

10.945 x 10^-4

Explanation:

Balanced equation:

Mn(OH)2 + 2 HCl --> MnCl2 + H2O

it takes 2 moles HCL for each mole Mn(OH)2

Next find the molarity of the Mn(OH)2 solution

= (1 mole Mn(OH)2 / 2 mole HCl) X (0.0020 mole HCl / 1000ml) X (4.86 ml)

= 4.86 x 10^-3 mole

this is now dissolved in (70 + 4.86) = 74.86 ml or 0.07486 L

thus [Mn(OH)2] = 4.86 x 10^-3 mole / 0.07486 L = 0.064921 M

Ksp = [Mn2+][OH-]^2 = 4x^3 = 4(0.064921)^3 = 10.945 x 10^-4

6 0

3 years ago

Uv gel enhancements rely on ingredients from the monomer liquid and ________ chemical family.

pishuonlain [190]

UV gel enhancements rely on ingredients from the monomer liquid and polymer powder chemical family. The chemicals from the polymer powder family can absorb and retain extremely large amounts of a liquid relative to their own mass. Water-absorbing polymers, can absorb aqueous solutions through hydrogen bonding with water molecules.

6 0

3 years ago

What is an advantage of using natural gas rather than a coal burning power plant?

Olenka [21]

Answer:

I hope it helps u

Explanation:

The advantages of using natural gas rather than coal are the following,

Natural gas is present in large amount than coal.
Natural gas is less costly than other fossil fuel sources of energy.
It increases security by decreasing dependence.
Natural gas is more environmentally friendly.
Natural gas is much safer to store.
It is reliable.
Natural gas is a fossil fuel, though the global warming emissions from its combustion are much lower than those from coal or oil.
Natural gas emits 50 to 60 percent less carbon dioxide (CO2) when combusted in a new, efficient natural gas-power plant compared with emissions from a typical new coal plant.

6 0

3 years ago

What name is given to substances in which atoms of two or more elements are chemically combined?

anygoal [31]

Answer:

Compounds

Explanation:

Substances in which atoms of two or more elements are chemically combined are called compounds.

A compound is a substance formed when two or more elements are chemically joined.

5 0

3 years ago

Read 2 more answers

Which one of the following will change the value of anequilibrium constant?

IRINA_888 [86]

Answer:

d. changing temperature

Explanation:

The thermodynamic equilibrium constant K is defined as a quantity characterizing the equilibrium of a chemical reaction. For a reaction where concentrations are in equilibrium:

aA + bB ⇄ cC + dD

The equilibrium constant is:

$k = \frac{[C]^c[D]^d}{[A]^a[B]^b}$

Thus, the equilibrium constant will change if:

a. Varying the initial concentration of reactants . FALSE. The k constant doesn't depend of initial concentrations but concentration in equilibrium does.

b. Adding other substances that do not react with any of thespecies involved in the equilibrium . FALSE. The equilibrium constant just depends of substances that are involved in the equilibrium

c. Varying the initial concentration of products . FALSE. Again, equilibrium constant doesn't depend of initial concentrations.

d. Changing temperature . TRUE. As a thermodynamic constant, k depends of temperature thus:

$K = e^(-dG/RT)$

e. Changing the volume of the reaction vessel. FALSE. The changing in the volume of the reaction vessel will change just the initial concentrations of the reactants.

I hope it helps!

6 0

3 years ago