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3 years ago

The percent composition of all elements in HClO3 is:

1 answer:

7 0

The percent composition is defined by mass percent. So the calculation is through the atomic mass. The mass for H is 1, Cl is 35.5, O is 16. So the answer is B.

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By 1999, after the clean water act had been passed in 1970, the percentage of u.s. surface waters safe for fishing and swimming

Rudiy27

Almost 30 years after the clean water act was passed in the US, the percentage of surface water considered safe for fishing and swimming had increased from 36% to 60% which is almost twice the original value. Certain programs and policies were implemented as part of the act.

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3 years ago

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Arrange the eluting power of the listed solvents in normal-phase chromatography. The highest eluting power solvent is number 1;

BabaBlast [244]

Answer:

Explanation:

Part a

Normal Phase Chromatography

In the normal phase chromatography, the eluting power is highest for the solvent which has the highest polarity.

So from the given solvents as Methanol, Dichloromethane and Ethyl Acetate

the relative polarities are given as

Methanol=0.762

Dichloromethane (methylene chloride)=0.309

Ethyl Acetate=0.228

So the numbers are given as

Methanol :1

Dichloromethane (methylene chloride):2

Ethyl Acetate:3

Reverse Phase Chromatography

In the reverse phase chromatography, the eluting power is highest for the solvent which has the lowest polarity.

So from the given solvents as diethyl ether , water and toluene

the relative polarities are given as

Diethyl ether=0.117

Water=1.0

Toluene=0.099

So the alphabets are given as

Toluene :A

Diethyl ether: B

Water:C

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3 years ago

The mass of an object is the ___.

timama [110]

A) amount of matter it contains.

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3 years ago

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Gloria is writing the chemical formula for a compound using its chemical name. She has just identified the names of the elements

disa [49]

She will use the periodic table of elements to not only find out the chemical symbols of the elements written within the name, but also to check whether or not the elements are metals and or nonmetals, from this determine the ionic charges if needed for metals, and for metals that have more than one ionic charge, use a Roman numeral to represent the ionic charge that she would be using in writing the chemical formula of the compound.

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4 years ago

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What function does adding a coefficient in a chemical equation serve?

shtirl [24]

Answer:

coefficients increase the products to increase the efficiency of the reaction.Coefficients balance the equation with respect to the law of conversation of mass. coefficients also increases the reactants to help the reaction proceed.

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4 years ago