Which mineral has the same hardness as a fingernail?a. Diamond
c. Fluorite
b. Topaz
d. Gypsum

Answers

Answer 1

Answer:

Gypsum

Explanation:

The hardness of minerals or substances is measured qualitatively using Mohs Scale. In this scale the hardness is measured qualitatively by characterizing the resistance shown by one substance when rubbed against second substance. Therefore, greater points are given to those substances which are capable of making scratches on other substances. The Mohs Scale of given compounds is as follow,

Diamond 10

Fluorite 4

Topaz 8

Gypsum 1.5 to 2

While the hardness value of Fingernail is 2 to 2.5. Hence, this value is close to Mohs scale hardness value of Gypsum therefore, gypsum is the correct answer.

Answer 2

Answer: Gypsum has the same hardness as a fingernail

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The first table was arranged by atomic mass, but later Mosely improved it by arranging by _______________.

Answers

Order of increasing atomic mass!

hope this helps :)

The first table, created by Mendeleev, was arranged by increasing atomic mass. However, it was later changed by Mosley, who arranged it the way it is today. He organized it by atomic number.

The reaction between an organic acid and an alcohol produces(1) an aldehyde (3) an ether
(2) a ketone (4) an ester

Answers

Answer : The correct option is, (4) an ester.

Explanation :

As we know that an organic acid is an organic compound that has the properties of an acid. For example : Acetic acid.

And the alcohol is an organic compound that contains one or more hydroxyl groups attached to a carbon atom. Fro example : Ethanol.

When an organic acid react with an alcohol the it produces an ester.

For example : when an organic acid (acetic acid) react with an alcohol (ethanol) to gives an ester (methoxyethane).

The balanced chemical reaction will be,

$CH_3COOH+CH_3OH\rightarrow CH_3C-O-O-CH_3+H_2O$

Hence, the reaction between an organic acid and an alcohol produces an ester.

The reaction between an organic acid and an alcohol produces an Ether.

In a nuclear power plant control rods are used to

Answers

Control rods are used in nuclear reactors to control the fission rate of uranium and plutonium. They are composed of chemical elements such as boron, silver, indium and cadmium that are capable of absorbing many neutrons without themselves fissioning.

You compare the gas generated from a reaction using two antacid tablets with the gas generated from a reaction using four antacid tablets (consider the antacid to be the limiting reagent). At constant pressure and temperature, how do the volumes of the gases compare?Question 4 options:

The gas generated by four antacid tablets has a greater volume

The gas generated by two antacid tablets has a greater volume

The two reactions produce the same amount of gas

I don't know

Answers

Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.

At constant pressure and temperature, The gas generated by four antacid tablets has a greater volume. The answer should be the first option.

Answer: The correct answer is the gas generated by four antacid tablets has a greater volume

Explanation:

In the question, it is given that pressure and temperature of the gas remain constant and we need to compare the volume of the gas produced by 4 antacid tablets and 2 antacid tablets.

As, antacid is the limiting reagent. Hence, more the tablets, more gas will be produced.

Hence, more gas will be produced by four antacid tablets than the gas produced by 2 antacid tablets.

To compare the volume, we use Avogadro's Law which states that volume is directly proportional to the number of the gas at constant pressure and temperature.

$V\propto n$ (At constant Temperature and Pressure)

Hence, volume will be greater for the gas produced by four antacid tablets.

Therefore, the correct answer is the gas generated by four antacid tablets has a greater volume

Which property of matter changes during a chemical change but not during a physical change

Answers

Answer:In a physical change, atoms are not rearranged and the matter's physical and chemical properties are unchanged. Chemical changes, on the other hand, rearrange the atoms of matter in new combinations, resulting in matter with new physical and chemical properties.

Explanation:

easy

Calculate the percentage of iron in iron (III) sulphate