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3 years ago

Magnesium oxide added to water forms magnesium hydroxide

Chemistry

1 answer:

Anuta_ua [19.1K]3 years ago

7 0

Magnesium Hydroxide or Milk of Magnesia Mg(OH)2 Ionic bonds.... I think ._.

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The 1995 Nobel Prize in chemistry was shared by Paul Crutzen, F. Sherwood Rowland, and Mario Molina for their work concerning th

Nikolay [14]

Answer:

$\Delta H_{rxn3}=-162.5 kJ/mol$

Explanation:

The reaction we need to calculate:

$O_3 (g) + Cl (g) \longrightarrow ClO (g) + O_2 (g)$

1) $O_3 (g) + ClO (g) \longrightarrow Cl (g) +2 O_2 (g)$

$\Delta H_{rxn}=-122.8 kJ/mol$

We need the ClO in the products side, so we use the inverse of this reaction:

$Cl (g) +2 O_2 (g) \longrightarrow O_3 (g) + ClO (g)$

$\Delta H_{rxn1}=122.8 kJ/mol$

2) $2 O_3 (g) \longrightarrow 3 O_2 (g)$

$\Delta H_{rxn2}=-285.3 kJ/mol$

Now we need to combine this two:

$Cl (g) +2 O_2 (g) + 2 O_3 (g)\longrightarrow O_3 (g) + ClO (g) + 3 O_2 (g)$

$Cl (g) + O_3 (g)\longrightarrow ClO (g) + O_2 (g)$

The enthalpy of reaction:

$\Delta H_{rxn3}=\Delta H_{rxn1}+ \Delta H_{rxn2}=122.8 kJ/mol-285.3 kJ/mol$

$\Delta H_{rxn3}=-162.5 kJ/mol$

4 0

3 years ago

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

Sati [7]

Answer:

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

Express your answer as a chemical equation. Identify all of the phases in your answer.

Write a chemical equation for NH4+(aq) showing how it is an acid or a base according to the Arrhenius definition.

Express your answer as a chemical equation. Identify all of the phases in your answer.

Explanation:

According to this theory, an acid is a substance that is a proton donor when the substance is dissolved in water.

The base is the one that gives OH- ions when dissolved in water.

KOH(aq) is a base.

Because it releases OH- ions when dissolved in water.

$KOH(aq)->K^+(aq)+OH^-(aq)$

The ammonium ion is an acid.

It can donate a proton when dissolved in water.

$NH_4^+(aq)->NH_3(aq)+H^+(aq)$

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3 years ago

In an experiment, the one variable that is changed is called the

Vsevolod [243]

Independent variable

7 0

3 years ago

Which came first the henry g.j moseley atomic model or the niels bohr atomic model?

Gnesinka [82]

The niels bohr model

5 0

3 years ago

The molar absorptivity of Beta-carotene at 490 nm is 1.36 x 105 M-1cm-1. What is the concentration of a solution of Beta-caroten

finlep [7]

Answer:

The correct answer to the following question will be Option E (1.0 x 10⁻³ M).

Explanation:

The given values are:

$A\lambda =140$

$\varepsilon=1.36\times 10^5 \ M \ {cm^{-1}}$

L = 1 \ cm

As we know,

⇒ $A\lambda=\varepsilon CL$

On putting the given values in the above formula, we get

⇒ $140=1.36\times 10^5\times C\times 1$

⇒ $C=\frac{140}{1.36\times 10^5}$

⇒ $C=102.9\times 10^{-5} \ M$

So that option E is the right answer.

3 0

3 years ago