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Morgarella [4.7K]
1 year ago
8

Write the value represented by 4.5x10-6 g

Chemistry
1 answer:
monitta1 year ago
6 0

the value represented by 4.5x10-6 g is 0.0000045 g it is a representation  in standard notation

To express enormous figures which are in standard notation like 1,300,000 or exceedingly minuscule quantities like 0.0000000000045, scientists use scientific notation. Scientific notation, also referred to as exponential form, is one of the earliest mathematical techniques. It is well regarded by practitioners. People use scientific notation to handle situations where numbers are too large or too small to be calculated easily. Scientists, engineers, and mathematicians all use this technique. where as standard notation is way writing numbers in normal decimal form. The scientific method id most convenient denoting numbers as the numbers will be either too big or too small.

To learn more about standard notation:

brainly.com/question/10253124

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il63 [147K]
Atomic mass silicon = 28.085 u

1 mol Si ---------------- 28.085 g  
?  ------------------------ 245 g

245 x 1 / 28.085 => 8.72 mol

answer A
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13 This word describes the circulatory system that provides nutrients and oxygen to living cells of the body.
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Answer: Cardiovascular System

Explanation:

This involves your heart, blood, veins, and arteries

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Which salt is produced when copper oxide reacts with hydrochloric acid?
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It forms copper chloride
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Which of the following reactions could be an elementary reaction? 2 NO2(g) + F2(g) → 2NO2F(g) Rate = k[NO2][F2] H2(g) + Br2(g) →
podryga [215]

<u>Answer:</u> The correct answer is NO(g)+O_2(g)\rightarrow NO_2(g)+O(g);Rate=k[NO][O_2]

<u>Explanation:</u>

Molecularity of the reaction is defined as the number of atoms, ions or molecules that must colloid with one another simultaneously so as to result into a chemical reaction.

Order of the reaction is defined as the sum of the concentration of terms on which the rate of the reaction actually depends. It is the sum of the exponents of the molar concentration in the rate law expression.

Elementary reactions are defined as the reactions for which the order of the reaction is same as its molecularity and order with respect to each reactant is equal to its stoichiometric coefficient as represented in the balanced chemical reaction.

For the given reactions:

  • <u>Equation 1:</u> 2NO_2(g)+F_2(g)\rightarrow 2NO_2F(g);Rate=k[NO_2][F_2]

Molecularity of the reaction = 2 + 1 = 3

Order of the reaction = 1 + 1 = 2

This is not considered as an elementary reaction.

  • <u>Equation 2:</u>  H_2(g)+Br_2(g)\rightarrow 2HBr(g);Rate=k[H_2][Br_2]^{1/2}

Molecularity of the reaction = 1 + 1 = 2

Order of the reaction = 1+\frac{1}{2}=\frac{3}{2}

This is not considered as an elementary reaction.

  • <u>Equation 3:</u>  NO(g)+O_2(g)\rightarrow NO_2(g)+O(g);Rate=k[NO][O_2]

Molecularity of the reaction = 1 + 1 = 2

Order of the reaction = 1 + 1 = 2

This is considered as an elementary reaction.

  • <u>Equation 4:</u>  NO_2(g)+CO(g)\rightarrow NO(g)+CO_2(g);Rate=k[NO_2]^2

Molecularity of the reaction = 1 + 1 = 2

Order of the reaction = 2 + 0 = 2

In this equation, the order with respect to each reactant is not equal to its stoichiometric coefficient which is represented in the balanced chemical reaction. Hence, this is not considered as an elementary reaction.

Hence, the correct answer is NO(g)+O_2(g)\rightarrow NO_2(g)+O(g);Rate=k[NO][O_2]

3 0
3 years ago
What does the name 2–butene tell you about this hydrocarbon's molecular structure?
jenyasd209 [6]
The suffix -ene tells that there is a double bond present in the molecule, and the 2 tells where in the molecule the bond is located. The molecule looks like this:


CH3-CH=CH-CH3

-ane indicates single bonds
-ene indicates at least one double bond
-yne indicates at least one triple bond
5 0
3 years ago
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