CHEMISTRY HIGH SCHOOL

Which process is exothermic?(1) boiling of water
(2) melting of copper
(3) condensation of ethanol vapor
(4) sublimation of iodine

Answers

Answer 1
Answer:

Answer:

The correct answer is option 3.

Explanation:

Condensationof ethanol vapors is an exothermic process. This is because particles in gaseous has highest energy . Some of this energy gets released when these particles or ethanol vapors condenses into a liquid state where they have less amount of energy in comparison to gaseous state.

C_2H_5OH(g)\rightarrow C_2H_5OH(l) + Heat

As we know that exothermic reaction are those reaction in which heat is released into the surroundings.

Where as the other options are example of an endothermic reaction.where heat is absorbed from the surroundings.

Hence, the correct answer is option 3.

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What is the chemical formula for mercury(I) nitrate

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Hg(NO3)2
I hope this helps :)

Each sheet of metal on a roof is parallel to the rest of the sheets of metal. If the first sheet of metal is perpendicular to the top line of the roof, what can you conclude about the rest of sheets of metal? Justify your answer.a. The sheets of metal are all perpendicular to the top line of the roof by the Alternate Interior Angles Theorem.
b. The sheets of metal are all perpendicular to the top line of the roof by the Transitive Property of Parallel Lines.
c. The sheets of metal are all perpendicular to the top line of the roof by the Converse of the Same-Side Interior Angles Theorem.

Answers

B.

Because all of the lines are parallel, and the top line is perpendicular to them, all of the lines are perpendicular to the top line due to the transitive property of parallel lines.

Answer:

b. The sheets of metal are all perpendicular to the top line of the roof by the Transitive Property of Parallel Lines.

A 55.0 g piece of iron at 505 ° C is put into 735 grams of water at 15.0 ° C. What is the final temperature of the water and the iron?

Answers

Answer:

It would be 95.3

Explanation:

Elements in a given period of the periodic table contain the same number of

Answers

A period in the periodic table is a row of chemical elements. All elements in a row have the same number of electron shells.

What are electron shells?

An electron shell is the outside part of an atom around the atomic nucleus.

Elements present in horizontal rows are called periods.

Elements belonging to the same period have same no. of the shell as the electrons are added in the same shell of the element.

Learn more about the electron shells here:

brainly.com/question/491265

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Electron shells. As the atomic number grows inside a period the electrons are added to a same shell.

HELP ME AGAIN FOR BRAINLIEST

Answers

Answer:

1: C

2: a

3: B

4: D

hope this helps

Which compound has hydrogen bonding between its molecules?(1) CH4 (3) KH
(2) CaH2 (4) NH3

Answers

NH3 has Hydrogen bonding between its molecules. 
Yup, NH3 it is. Hydrogen bonding usually occur between hydrogen and another electronegative atom such as oxygen, nitrogen or fluorine.
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