Question 13 Which response includes all of the following that involve chemical c

ID: 848952 • Letter: Q

Question

Question 13

Which response includes all of the following that involve chemical changes and no physical changes?
I. burning charcoal
II. melting of gold
III. fermentation of grapes
IV. burning of natural gas
V. melting of ice

I and IV

Question 14

Which of the following statements is correct?

Both elements and compounds are pure substances.

Question 15

Which one of the following conversion factors is not consistent with the equation

Question 16

Which of the following equations is not balanced?

Question 17

Calculate the heat energy that must be removed from 17.6 grams of ammonia gas to condense it to liquid ammonia at its boiling point, -33

I, III, and IV

Explanation / Answer

13. I, III AND IV

I - Its a chemical change because the properties of charcoal are changing when fire makes contact with it. It is realising energy and that is one of the most important signs to know if it is a chemical reaction

III - It is a chemical change. They aren't the same grapes anymore, they are now wine instead of grapes.

IV - It is chemical change because when you burn a colourless natural gas, it'll turns into yellow or blue flame depends on the temperature. Combustion of natural gas will produced carbon diovide and water.

The following will be the chemical formulae for the burning of natural gas (methane):-
CH4 + O2=CO2 + H2O

14. Both elements and compounds are pure substances.

A pure substance or chemical substance is a material that has constant composition (is homogeneous) and has consistent properties throughout the sample.

15. Question not visible due to absence of images

16. Second last equation is not balanced. 10 O atoms on the left whereas 8 O atoms on the right.

2NaHCO3 + H2SO4 -> Na2SO4 + 2H2O + CO2

17. Energy required = 17.6 * 1380 = 24288 = 24300 J (answer)

18. Heat absorbed = Specific heat * mass

For A : Heat absorbed = (Sb /4)* 24 = 6Sb

For B : Heat absorbed = Sb *12 = 12Sb

Thus The heat absorbed by substance A was __one-half______ the heat absorbed by substance B.

19. homogeneous mixture

Navigate

Question 13 Which response includes all of the following that involve chemical c

Question 13 Which segment of code inserts a new node (pointed to by pointer X) a

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.

Question 13 Which response includes all of the following that involve chemical c

Question

Explanation / Answer

Related Questions

Navigate