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3 years ago

Write a chemical equation for hcl(aq) showing how it is an acid or a base according to the arrhenius definition.

1 answer:

3 0

the arrhenius acid definition is when a substance that will dissociate in water and will form H+ ions. for HCl the chemical equation to satisfy as an arhenius acid definition is, the HCl will dissociate to form H + and Cl- ions. in equation form: HCl ----> H+ + Cl-

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a solution is made by dissolving 21.5 grams of glucose (C6H12O6) in 255 grams of water. what is the freezing point depression of

Lesechka [4]

The freezing point depression of the solution or pure substance that is added with the solvent is calculated through the equation,

 ΔTf = Kfm

where ΔT is the freezing point depression, Kf is the constant for water given to be -1.86°C/m and m is the molality of the solution.

Molality is calculated through the equation,

m = number of moles solute/ kg of solvent

Calculation of molality is shown below.

m = (21.5 g C6H12O6)(1 mol/180 g) / (0.255 kg)
m = 0.468 molal

The freezing point depression is then,

ΔTf = (-1.86°C/m)(0.468 m) = -0.87°C

Answer: -0.87°C

3 0

3 years ago

What happens to the mass of atoms during a nuclear reaction.

Damm [24]

energy can't be created or destroyed, but mass particles can decay or tranform into others as long as the total mass/energy (remeber E=MC2) is conserved, in nuclear reactions one type of sub-atomic particle change into another, this destabilizes the nucleus forcing it to split and release a certain amount of energy in the form of massless particles

5 0

3 years ago

The reaction of iron and water vapor results in an equilibrium3 Fe(s) + 4 H2O (g) ⇋ Fe3O4 (s) + 4 H2 (g) Kc = 5.0 at 800.°CWhat

labwork [276]

Answer: The equilibrium concentration of water is 0.1 M

Explanation:

To calculate the molarity of solution, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Mass of solute}}{\text{Molar mass of solute}\times \text{Volume of solution (in L)}}$

Given mass of hydrogen gas = 7.5 g

Molar mass of hydrogen gas = 2 g/mol

Volume of solution = 15.0 L

Putting values in above equation, we get:

$\text{Molarity of hydrogen gas}=\frac{7.5}{2g/mol\times 15.0}\\\\\text{Molarity of hydrogen gas}=0.25M$

For the given chemical equation:

$3Fe(s)+4H_2O(g)\rightleftharpoons Fe_3O_4(s)+4H_2(g)$

As, the reaction is initiated by hydrogen gas, the reaction will proceed backwards and the equilibrium constant will be the reciprocal of equilibrium constant for the given reaction.

Now, the reaction becomes:

$Fe_3O_4(s)+4H_2(g)\rightleftharpoons 3Fe(s)+4H_2O(g);K_c'$

Initial: 0.25

At eqllm: 0.25-4x 4x

We are given:

$K_c=5.0$

So, $K_c'=\frac{1}{5.0}=0.2$

The expression of $K_c'$ for above equation follows:

$K_c'=\frac{[H_2O]^4}{[H_2]^4}$

The concentration of pure solids and liquids are taken as 1 in the equilibrium constant expression.

Putting values in above equation, we get:

$0.2=\frac{(4x)^4}{(0.25-4x)^4}\\\\x=-0.126,0.025$

Neglecting the value of x = -0.126 because concentration cannot be negative.

So, equilibrium concentration of water = $4x=(4\times 0.025)=0.1M$

Hence, the equilibrium concentration of water is 0.1 M

7 0

3 years ago

What are the three particles of an atom

g100num [7]

The three particles of any atom are
electron) the smallest particle and is held in shells around the nucleus of the atom
proton) is found in the nucleus and is much larger than an electron
neutron) the same mass as a proton and also found in the nucleus of the atom

5 0

3 years ago

Read 2 more answers

Iron can be protected from rusting by coating it in a thin layer of zinc in a process called galvanisation.The zinc layer is oxi

lukranit [14]

Answer:

Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron (III) oxide, which we see as rust. Here is the word equation for the reaction: iron + water + oxygen → hydrated iron (III) oxide

In this reaction, zinc atoms each will lose two electrons (oxidation) and become Zn 2+ ions. The two electrons that are released by zinc will be gained by the Cu 2+ ions (reduction). The Cu2+ ions become Cu atoms. Total equation: Zn (s) + CuSO 4 (aq) --> Cu (s) + ZnSO 4 (aq)

Explanation:

8 0

3 years ago