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3 years ago

Which property is the least reliable method for identifying a mineral

Chemistry

2 answers:

SSSSS [86.1K]3 years ago

4 0

Answer:

Color

Explanation:

Ivenika [448]3 years ago

3 0

Answer:

I think it is a color but I'm not completely sure

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An understanding of periodic trends is important because the trends 1. can be used to convert non-useful elements to useful ones

Andreas93 [3]

<span>3. relate to properties of elements and how they may react. Periodic trends are specific patterns that are present in the periodic table that include size, electronic properties, melting point, electronegativity and metallic character. The trends exist due to the similar atomic structure of the elements within each group family.</span>

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3 years ago

A 0.020 M solution of niacin has a pH of 3.26. (a) What percentage of the acid is ionized in this solution

mariarad [96]

Answer: 2.75%

Explanation:

$pH=-log [H+]$

$3.26 = -log [H+]$

$[H+] = 5.495\times 10^{-4} M$

$HA\rightleftharpoons H^++A^-$

initial 0.020 0 0

eqm 0.020 -x x x

$K_a=\frac{[H+][A-]}{[HA]}$

$K_a=\frac{[x][x]}{[0.020-x]}$

$x=5.495\times 10^{-4}$

$K_a=\frac{[5.495\times 10^{-4}]^2}{[0.020-5.495\times 10^{-4}]}$

$K_a =1.553\times 10^{-5}$

percent dissociation = $\frac{[H^+_eqm]}{[Acid_{initial}]}\times 100$

percent dissociation= $\frac{5.495\times 10^{-4}}{0.020}\times 100$

Thus percent dissociation= 2.75 %

5 0

3 years ago

Which two changes would make this reaction favor the formation of products? 2502 +02= 2503 + energy A. Raising the temperature B

Alisiya [41]

C. Decreasing the temperature

D. Raising the pressure

<h3>Further explanation</h3>

Given

Reaction

2SO₂+O₂⇔2SO₃+energy

Required

Changes to the formation of products

Solution

The formation of SO₃ is an exothermic reaction (releases heat)

If the system temperature is raised, then the equilibrium reaction will reduce the temperature by shifting the reaction in the direction that requires heat (endotherms). Conversely, if the temperature is lowered, then the equilibrium shifts to a reaction that releases heat (exothermic)

While on the change in pressure, then the addition of pressure, the reaction will shift towards a smaller reaction coefficient

in the above reaction: the number of coefficients on the left is 3 (2 + 1) while the right is 2

As the temperature decreases, the equilibrium will shift towards the exothermic reaction, so the reaction shifts to the right towards SO₃( products-favored)

And increasing the pressure, then the reaction shifts to the right SO₃( products-favored)⇒the number of coefficients is greater

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3 years ago

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Photosynthesis is a redox reaction. this means that h2o is _____ during the light reactions and co2 is _____ during the calvin c

bogdanovich [222]

Photosynthesis is a redox reaction. This means that H2O is oxidized during the light reactions and CO2 is reduced during the Calvin cycle.

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4 years ago

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Why does the temperature stop rising while ice melts into water?

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