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Salsk061 [2.6K]
3 years ago
8

Chemical changes can be reversed by physical changes. Please select the best answer from the choices provided T F

Chemistry
2 answers:
Wewaii [24]3 years ago
6 0
False. A physical change can only reverse a physical change 
Katyanochek1 [597]3 years ago
4 0

Answer: Given statement is false.

Explanation:

Chemical changes are the changes which occur when two or more aoms chemically combine together and they result in the formation of new product(s).

For example, Na + Cl \rightarrow NaCl is a chemical reaction as it forms compound sodium chloride (NaCl).

Also, chemical reactions cannot be reversed by physical changes as chemical changes form chemical compounds which can only be reversed by chemical changes only.

Thus, we can conclude that the statement chemical changes can be reversed by physical changes is false.

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1) A mixture of anhydrous sodium carbonate and sodium hydrogencarbonate of mass 10.000 g was heated until it reached a constant
vodomira [7]

The masses of the components are obtained as;

  • Sodium hydrogen carbonate = 3.51 g
  • Sodium carbonate =  8.708 g
<h3>What is decomposition?</h3>

The term decomposition has to do with the breakdown of the given substance into its components. The components of sodium hydrogen carbonate could be identified as water vapor, carbon dioxide gas and sodium carbonate. Among these products that have been listed here, we can see that it is only the sodium carbonate that remains as a solid. The others are gases that move away from the system that is under study.

Now putting down the equation of the reaction, we have;

2NaHCO_{3} (s) ----- > Na_{2} CO_{3} (s) + CO_{2} (g) + H_{2} O(g)

Now, the loss in  mass must be due to the carbon dioxide and the water. Hence we obtain the loss in mass to be 10.000 g -  8.708 g = 1.292 g

Mass of sodium hydrogen carbonate = 2 * 88 g/mol * 1.292 g/62 g/mol

= 3.51 g

Learn more about anhydrous sodium carbonate :brainly.com/question/20479996

#SPJ1

6 0
1 year ago
I WILL MARK BRAINLIEST PLZ HELP ASAP, thanks :)
7nadin3 [17]

Answer:

Inner

Explanation:

3 0
3 years ago
Which statement best describes the properties of covalent compounds?
scZoUnD [109]
B. They may be gases, liquids, or solids at room temp.
4 0
4 years ago
Read 2 more answers
,SJhfgaiuehrg;oiaerhgoaw<br> ?
Snezhnost [94]

Answer:

I don't understand anything but thanks for the points

please say in English. I mean say properly the question.......

thank you

6 0
3 years ago
Which type of data have elements in common but do not fit into rigid rows and columns in a table?.
Talja [164]

Answer: Semi-structured data is a type of data that has some consistent and definite characteristics. It does not confine into a rigid structure such as that needed for relational databases that which is why  it will not fit into row and columns in a table .

Explanation:

6 0
3 years ago
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