Chemistry, 24.06.2019 11:00 frankgore7836

How can naphthalene be separated from a mixture of kbr and sand?

Answers: 1

Show answers

Answers

Answer from: izzyp619

Explanation:

A mixture of naphthalene in KBr and sand can be separated by heating as naphthalene has low boiling point. Hence, its volatility is high due to which it will easily escape out from the mixture.

So, vapors of naphthalene can be collected through sublimation. As a result, naphthalene will be separated out from the mixture.

Now, only KBr and sand is left in the mixture. So, water will be added in to this mixture due to which KBr will dissolve in it. And upon filtration sand will be separated out of this mixture.

Whereas upon heating the mixture of water and KBr, water will evaporate and crystals of KBr will be obtained. As a result, all the components of this mixture will be separated out.

Answer from: Quest

answer: - 3.) the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

solution: - as per the rules, oxidation number of oxygen in its compounds is -2. the sum of oxidation numbers of all the elements of a molecule or compound is zero.

also, the oxidation number in elemental form is zero.

in no, the oxidation number of o is -2 so the oxidation number of n is +2 so that the sum is zero.

similarly, the oxidation number of c in co is +2 and o is -2.

on product side the oxidation number of n is 0 as it is in the elemental form( $n_2$ ) .

oxidation number of c in carbon dioxide is +4 as there are two oxygen in it and we know that each oxygen is -2.

so, oxidation number of n is changing from +2 to 0 and the oxidation number of c is changing from +2 to +4.

since nitrogen is reduced and hence no is acting as an oxidizing agent. carbon is oxidized and so co is acting as a reducing agent.

so, the right choice is number 3.)the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

Answer from: Quest

What are the options? i can you if you give them.

Another question on Chemistry

Chemistry, 21.06.2019 22:30

1. combine iron and copper (ii) sulfate solution. (hint: iron will form the iron (iii) ion) fe + cuso4 → 2. combine lead (ii) nitrate and potassium iodide solutions. pb(no3)2+ kl → 3. combine magnesium metal and hydrochloric acid solution. mg + hcl → 4. electrolysis (splitting) of water. h2o → 5. burning magnesium. mg + o2 →

Answers: 3

Answer

Chemistry, 22.06.2019 02:00

Write a hypothesis that answers the lesson question, “while observing a chemical reaction, how can you tell which reactant is limiting? ” hypothesis: if a substance is the limiting reactant, then . . because . .

Answers: 1

Answer

Chemistry, 22.06.2019 10:00

Part 1: include important facts found through your research. part 2: include your visual display. include your summary of “the chemistry of water” from the national science foundation website. include your experiment. part 3: include responses to the reflection questions.

Answers: 1

Answer

Chemistry, 22.06.2019 11:00

An object becomes electrically charged when: electrons are created in it electrons from it are destroyed electrons are transferred to it protons from it are destroyed protons are created in it