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3 years ago

Is adding zinc to hydrogen chloride a chemical or physical change

Chemistry

2 answers:

BlackZzzverrR [31]3 years ago

8 0

That is a chemical change.. Hope I helped!

seraphim [82]3 years ago

7 0

It's a chemical change because its changing the composition of the compound and making into an entirely different substance.

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All exothermic reactions _____. Select all that apply. a. are endothermic b. are exothermic c.release energy d.are rapid reactio

Paha777 [63]

Answer:

All exothermic reactions _c.release energy____

Explanation:

Exothermic reactions are those that give off energy, for example in the form of heat in combustion (it has a negative enthalpy variation, the energy of the products being less than the energy of the reagents)

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3 years ago

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What is the number of moles of 60.7 liters of oxygen molecules?

Arturiano [62]

Answer:

2.17 moles of gas.

Explanation:

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3 years ago

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3 years ago

Consider the malate dehydrogenase reaction from the citric acid cycle. Given the listed concentrations, calculate the free energ

Ahat [919]

<u>Answer:</u> The Gibbs free energy of the reaction is 21.32 kJ/mol

<u>Explanation:</u>

The chemical equation follows:

$\text{Malate }+NAD^+\rightleftharpoons \text{Oxaloacetate }+NADH$

The equation used to Gibbs free energy of the reaction follows:

$\Delta G=\Delta G^o+RT\ln K_{eq}$

where,

$\Delta G$ = free energy of the reaction

$\Delta G^o$ = standard Gibbs free energy = 29.7 kJ/mol = 29700 J/mol (Conversion factor: 1 kJ = 1000 J)

R = Gas constant = 8.314J/K mol

T = Temperature = $37^oC=[273+37]K=310K$

$K_{eq}$ = Ratio of concentration of products and reactants = $\frac{\text{[Oxaloacetate]}[NADH]}{\text{[Malate]}[NAD^+]}$

$\text{[Oxaloacetate]}=0.130mM$

$[NADH]=2.0\times 10^2mM$

$\text{[Malate]}=1.37mM$

$[NAD^+]=490mM$

Putting values in above expression, we get:

$\Delta G=29700J/mol+(8.314J/K.mol\times 310K\times \ln (\frac{0.130\times 2.0\times 10^2}{1.37\times 490}))\\\\\Delta G=21320.7J/mol=21.32kJ/mol$

Hence, the Gibbs free energy of the reaction is 21.32 kJ/mol

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3 years ago

When the hydronium ion concentration equals 10 moles per liter, what is the ph of the solution? is the solution acidic or basic?

Nata [24]

pH = - log[acid] = -log [H+]

pH= -log[10] = 1

Thus, pH is 1

if pH is 7, the solution is neutral and if pH is greater than 7 the solution is basic and if it is less than 7 the solution is acidic.

This solution have pH = 1, thus the solution is acidic.

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3 years ago