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3 years ago

PLEASE HELP!! thank you in advance! :)

Chemistry

1 answer:

cupoosta [38]3 years ago

7 0

Answer:

Chemical compound

Explanation: I looked it up on google and it said it was a Chemical compound if that helps

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dimulka [17.4K]

Answer:

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I just learned all this in chemistry too lol

got 100 on the test last week so its good

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I think that's the one with like snow hail and sleet

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Why is it important for scientists to keep testing a hypothesis even after they've found it to be true?

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I think that A is the answer

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A weak monoprotic acid has molar mass 180 g/mol. When 1.00 g of this acid is dissolved in enough water to obtain a 300 mL soluti

Kaylis [27]

Answer: The value of $K_a$ for the given acid is $3.58\times 10^{-4}$

Explanation:

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

$\text{Molarity of the solution}=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}$

Initial mass of weak monoprotic acid = 1.00 g

Molar mass of weak monoprotic acid = 180 g/mol

Volume of solution = 300 mL

Putting values in above equation, we get:

$\text{Molarity of weak monoprotic acid}=\frac{1.00\times 1000}{180\times 300}\\\\\text{Molarity of weak monoprotic acid}=0.0185M$

To calculate the hydrogen ion concentration for given pH of the solution, we use the equation:

$pH=-\log[H^+]$

We are given:

pH = 2.62

Putting values in above equation, we get:

$2.62=-\log[H^+]$

$[H^+]=10^{-2.62}=2.40\times 10^{-3}M=0.0024M$

The chemical equation for the dissociation of weak monoprotic acid (HA) follows:

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

Initial: 0.0185

At eqllm: 0.0185-x x x

Evaluating the value of 'x'

$\Rightarrow x=0.0024$

So, equilibrium concentration of HA = (0.0185 - 0.0024) = 0.0161 M

Equilibrium concentration of $A^-$ = x = 0.0024 M

The expression of $K_a$ for above equation follows:

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

Putting values in above equation, we get:

$K_a=\frac{(0.0024)\times (0.0024)}{0.0161}=3.58\times 10^{-4}$

Hence, the value of $K_a$ for the given acid is $3.58\times 10^{-4}$

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4 years ago

Which of these natural resources is non-renewable A.Corn B.wind c.geothermal D.natural gas

adelina 88 [10]

The correct answer would be: D. Natural gas

This would be the correct answer since natural gases are considered a fossil fuel. The other options are renewable resources. Corn can be reproduced. Wind is a source of energy which makes it renewable. Geothermal is also a renewable resource since its heat is from the earth's core which could be used multiple times.

Hope this helps! :3

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