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2 years ago

7

_____ energy is required to start a reaction. potential activation nuclear kinetic

2 answers:

Alekssandra [29.7K]2 years ago

6 0

Answer: Activation energy is required to start a reaction.

Explanation: The activation energy is the amount of energy required to start a chemical reaction.

Anna35 [415]2 years ago

6 0

Activation energy is required to start a reaction.

Answer: activation

<u>Explanation:</u>

Activation energy is the minimum energy the molecules required in order to collide with each other. Chemical reactions require a particular energy to start its function. The reaction only occurs when the products are more stable than the reactants.

This energy can be in the form of kinetic or potential energy. When the molecules collide, the molecules' kinetic energy used to stretch, sometimes bend and possibly break bonds, causing chemical reactions. Faster the objects move, more the kinetic energy it possesses.

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Why does potassium permanganate need to be standardized right before a titration?.

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To determine the strength of potassium permanganate with a standard solution of oxalic acid.

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2 years ago

How many minutes will it take to plate out 4.50 g of Cu from a solution of Cu(NO3)2 (aq) onto the cathode of an electrolytic cel

ipn [44]

Answer:

It will take 28.5 minutes

Explanation:

<u>Step 1: </u>Data given

Mass of Cu = 4.50 grams

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Step 2: Calculate time needed

Cu2+ →Electricity → Cu

we notice a flow of 2 electrons ⇒ This means the Faraday constant = 2F

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63.5 grams of Cu is deposited by 2*96500 C

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3 0

3 years ago

Three isotopes of argon occur in nature – 36 18Ar, 38 18Ar, 40 18Ar. Calculate the average atomic mass of argon to two decimal p

likoan [24]

Answer: 3) 39.96 amu

Explanation:

Mass of isotope Ar- 36 = 35.97 amu

% abundance of isotope Ar- 36= 0.337% = $\frac{0.337}{100}=3.37\times 10^{-3}$

Mass of isotope Ar- 38 = 37.96 amu

% abundance of isotope 2 = 0.063 % = $\frac{0.063}{100}=6.3\times 10^{-4}$

Mass of isotope Ar- 40 = 39.96 amu

% abundance of isotope 2 = 99.600 % = $\frac{99.600}{100}=0.996$

Formula used for average atomic mass of an element :

$\text{ Average atomic mass of an element}=\sum(\text{atomic mass of an isotopes}\times {{\text { fractional abundance}})$

$A=\sum[(35.97\times 3.37\times 10^{-3})+(37.96\times 6.3\times 10^{-4})+(39.96\times 0.996)]$

$A=39.96amu$

Therefore, the average atomic mass of argon is 39.96 amu

4 0

3 years ago