CHEMISTRY HIGH SCHOOL

Which formula represents an ionic compound

Answers

Answer 1
Answer: If these are the options 1.H2, 2.CH4, 3.CH3OH, 4.NH4CI. Then the anwer is 4.NH4CI
Answer 2
Answer: NH4Cl dissociates into ions (NH4+ and Cl-) in water.

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What elements of paint can help forensic scientists compare samples to each other?

Answers

Paints consist of pigments, solvents, and binders. Once the paint has been applied and has dried, the pigments are still able to be determined and matched to other samples.

What is added to Paints?

Manufacturers apply a variety of coatings to the body of an automobile, which adds significant diversity to automobile paint. This diversity makes it easier of the forensic scientist to compare different paint samples.

When paint specimens possess colored layers that match with respect to number and sequence of colors, the examiner can begin to think confidently in terms of relating the paints to a common origin.

The shortcoming of analysis of paint layer structures is the most paint specimens presented to the criminalist do not have layer structure sufficiently complex to allow individualization to a single source.

Therefore, Paints consist of pigments, solvents, and binders. Once the paint has been applied and has dried, the pigments are still able to be determined and matched to other samples.

Learn more Paints, here:

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It would have to be paints consists of pigments,solvents, and binders. Once the [paint has been applied and has dried, the pigments are still able to determine the matched samples.

Ice is put into a glass of coke energy flows from ______________to________________.

Answers

Coke to ice because coke has a higher temperature than ice.

An element, X, has 2 isotopes, X-32 with an abundance of 31.5% and X-35 with an abundanceof 68.5%. What is the average atomic mass of element X?

Answers

Answer:

amu = 34.055 or 34.1

Explanation:

to calculate the average mass, first convert the percentages into decimals. Then, calculate the mass numbers. To get this number, multiply the decimal by the mass number for each isotope and, then add them together.

( 0.315 x 32 ) + (0.685 x 35 ) = 34.055

Which bond pair does not have a polar covalent bond?A. P – Cl



B. O – H



C. S – Cl



D. H – Cl



E. Cl – Cl

Answers

The answer is E. Cl -- Cl

Chloride, Cl2, has a non-polar covalent bond because both molecules making up the compound are identical. This results to a diatomic molecule, which are known non-polar molecules. Since both sides of the bond are also the same, there is equal sharing of electrons. Polar covalent bonds are those that have unequal sharing of electrons.

After creating a Beer's Law plot using standard solutions of Q, you determined the slope of Beer's Law to be 0.543 M-1. Your unknown solution of Q tested in Part B of the experiment had an absorbance of 0.144. Determine the concentration (in molarity) of the unknown solution Q from Part B. Do not use scientific notation or units in your response. If Carmen adds zeros after the decimal place, your answer will still be graded correctly.

Answers

Answer : The concentration (in molarity) of the unknown solution Q is, 0.265

Explanation :

Using Beer-Lambert's law :

A=\epsilon * C* l

where,

A = absorbance of solution

C = concentration of solution

l = path length

\epsilon = molar absorptivity coefficient

From the Beer's Law plot between absorbance and concentration we concldue that the slope is equal to \epsilon * l  and path length is 1 cm.

As we are given that:

Slope = 0.543 M⁻¹

and,

Slope = \epsilon * l

\epsilon * l=0.543M^(-1)

\epsilon * 1cm=0.543M^(-1)

\epsilon=0.543M^(-1)cm^(-1)

Now we have to determine the concentration (in molarity) of the unknown solution Q.

Using Beer-Lambert's law :

A=\epsilon * C* l

0.144=0.543M^(-1)cm^(-1)* C* 1cm

C=0.265M

Therefore, the concentration (in molarity) of the unknown solution Q is, 0.265

If 21.3 grams of lithium react with excess water, how many liters of hydrogen gas can be produced at 297 kelvin and 1.40 atmospheres?

Answers

Hope it cleared your doubt :)
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