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3241004551 [841]
2 years ago
6

What is important about the properties of a substance that has undergone a chemical change?

Chemistry
2 answers:
irakobra [83]2 years ago
8 0

The substances created during chemical reactions, on the other hand, do not simply revert to their initial state. The most essential thing to remember is that the makeup of a material does not change when it undergoes a physical change, but it does change when it undergoes a chemical change.

photoshop1234 [79]2 years ago
4 0

Answer:

the most important thing for you to remember is that in a physical change composition of a substance does not change and in a chemical change the composition of a substance does change

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When potassium metal is placed in water a large amount of energy is released as potassium hydroxide and hydrogen gas are produce
Ann [662]

Explanation:

2K(s)+2H_2O\rightarrow 2KOH(aq)+H_2(g)

The given reaction is redox reaction but not combustion reaction.

Redox reaction : It is a chemical reaction in which oxidation and reduction occurs simultaneously.Oxidation is gaining of electrons and reduction is loosing of electrons.

K\rightarrow K^++e^- oxidation

2H^++2e^-\rightarrow H_2 reduction

Potassium when reacts with water ,gives potassium ion in aqueous medium and combines with hydroxide ion present in water to form potassium hydroxide where as H^+ ions of water by gaining electrons (from potassium in water) gives hydrogen gas.

Hence , yes it is a redox reaction

Combustion reaction are the chemical reaction in which one reactant react with oxygen molecule to give heat and light.

Here in given reaction no oxygen molecule is appearing on reactant side.

Hence not a combustion reaction.

6 0
3 years ago
How many amino acids are considered scientist to be “essential
grin007 [14]

Yo sup??

The answer to your question is option c ie

c.9

the rest 12 are under non essential as they  are produced by our body itself

Hope this helps.

3 0
3 years ago
Using the words cohesive and adhesive, explain why water forms a meniscus?​
I am Lyosha [343]
Adhesion is responsible for a meniscus and this has to do in part with water's fairly high surface tension. Water molecules are attracted to the molecules in the wall of the glass beaker. And since water molecules like to stick together, when the molecules touching the glass cling to it, other water molecules cling to the molecules touching the glass, forming the meniscus. They'll travel up the glass as far as water's cohesive forces will allow them, until gravity prevents them from going further. Cohesion is an intermolecular attraction between like molecules (other water molecules in this case).
3 0
2 years ago
Why does the boiling point of a liquid vary with atmospheric pressure?
tigry1 [53]
Atmospheric pressure decreases because air is less dense at higher altitudes. Because the atmospheric pressure is lower, the vapour pressure of the liquid needs to be lower to reach boiling point.
8 0
3 years ago
Which of these following have a positive charges
Over [174]
Talking about ions, a cation has a positive charge. That means a positive charge is gained by an atom that gives out electrons. 
7 0
3 years ago
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