A solid is cooled to a very low temperature assuming the mass remains constant how if at all does this affect the density of the solid?

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Answer 1

Answer: Temperature is related to the kinetic energy the atoms within any givensubstance. Within a solid, we can therefore assume that the density willincrease as the solid is cooled to a low temperature, as this willcause a loss in kinetic energy and the atoms won't be able to move asfreely.

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It's urgent. I need help to know the oxidation numbers and what is the oxidation and reduction part of this equation Fe + H2SO4= Fe2(SO4)3 + H2

Answers

In the given equation: Fe + H2SO4 = Fe2(SO4)3 + H2

To determine the oxidation numbers, we assign oxidation numbers to each element in the equation.

1. Fe: The oxidation number of Fe is 0 since it is in its elemental form.

2. H2SO4:
- H has an oxidation number of +1.
- S has an oxidation number of +6 since it is in the sulfate ion (SO4)2-.
- O has an oxidation number of -2.

3. Fe2(SO4)3:
- Fe has an oxidation number of +3 since it is in the Fe2+ ion.
- S has an oxidation number of +6 since it is in the sulfate ion (SO4)2-.
- O has an oxidation number of -2.

4. H2:
- H has an oxidation number of 0 since it is in its elemental form.

Now, let's analyze the oxidation and reduction parts of the equation:

Oxidation: Fe is oxidized from an oxidation number of 0 to +3 in Fe2(SO4)3.

Reduction: H2SO4 is reduced. The sulfur (S) in H2SO4 goes from an oxidation number of +6 to +4 in Fe2(SO4)3, and the hydrogen (H) in H2SO4 goes from an oxidation number of +1 to 0 in H2.

Overall, in this equation, Fe is oxidized, and H2SO4 is reduced.

If the Kelvin temperature of a gas is tripled and the volume if doubled, the new pressure will be ___. A. 3/2 the original pressure B. 1/6 the original pressure C. 5 times the original pressure D. 2/3 the original pressurethe answer isnt b or c

Answers

The answer is 3/2 the original pressure. The concept behind this is the ideal gas law wherein it states that Pressure (P) times volume(V) is equal to number of moles (n) times ideal gas constant (R ) times temperature (T). Since you’re trying to calculate for the pressure you use P=nRT/V. Input 3 to Temperature and 2 to volume. You’ll get a pressure of 3/2 which is 3/2 times the original pressure.

Which statement correctly describes a chemical equilibrium? it must take place in an open system the mass of the reactants and the mass of the products are no equal it is affected by the addition of a catalyst it does not involve a reversible reaction the concentrations of reactants and products are equal

Answers

In your choices, the best answer is the mass of the reactants and the mass of the products are no equal. The chemical equilibrium can take place in a close system and can not be affected by catalyst and is a reversible reaction. The best describe should be the concentration of reactants and products are constant.

The chemical equilibrium can take place in a close system and can not be affected by catalyst and is a reversible reaction.

The term "chemical equilibrium" describes a situation in which a chemical reaction's forward reaction rate and reverse reaction rate are equal. In other words, throughout time, the reactant and product concentrations in the reaction mixture do not change. Even if the individual reactions may still be in progress, there is no net change in the reactant or product concentrations at the point of chemical equilibrium. This occurs as a result of the equalisation of the rates at which molecules react to create products and molecules disintegrate into reactants. Even though the reaction is still taking place at the molecular level, the system is in equilibrium and it appears to have stopped.

To know more about chemical equilibrium, here:

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A salt is best described as a compound that is formed from the reaction betweenan acid and a base.
a strong acid and a weak acid.
a strong base and a weak base.
an acid and water.

Answers

The right answer is A (strong acid with strong base).

The reaction of an acid with a base to produce salt and water alone is called a neutralization reaction.

A salt is a compound formed following a replacement of the hydrogen ions (H +) of an acid with a basic radical during a reaction.

A normal salt is formed by the complete replacement of the H + of an acid (example Na2CO3).

while an acidic salt is formed by the incomplete replacement of the H + of an acid (eg NaHCO3).

Chemical buffers are compounds that will bind (click to select) when they are in abundance in a solution. This prevents an unwanted drop in pH. True False