06.08.2020

Which of these is an example of a chemical change?

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24.06.2023, solved by verified expert
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No answer choices but Chemical changes are changes in which can't be undone an example would be a rotting food(won't be fresh ever again) or burning paper(ashes are ashes not paper)

Explanation:

Hope this helps :D

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Biology
Step-by-step answer
P Answered by Master

The explanations are mentionned in the attached file.

1. The right answer is physical changes.

2. The right answer is chemical changes.

3. The right answer is chemical change.

4. The right answer is fireworks exploding.

5. The right answer is All of the above.

6. The right answer is combining oxygen gas and hydrogen gas to form liquid water.

7. The right answer is gas is produced.

8. The right answer is The compound may or may not be poisonous, depending on the chemical properties of the new substance.

9. The right answer is This is a physical change, because the two substances were separated physically by boiling.

10. The right answer is C. The tablet that was placed in the water interacted  ... chemical change.

11. The right answer is B. Energy is either released or absorbed.

12. The right answer is that we should compare both physical and chemical properties of these two substances : if they have the same properties, it means that it is the same substance, if not, they are different substances.

13. The right answer is A. Flammability.

14. The right answer is Column.

15. The right answers are Melting point, conductivity, solubility, malleability, density.

16. The right answer is oxidation, flammability, combustibility.

17. The right answer is A. Arrangement of protons in the nucleus.

Biology
Step-by-step answer
P Answered by Master

The explanations are mentionned in the attached file.

1. The right answer is physical changes.

2. The right answer is chemical changes.

3. The right answer is chemical change.

4. The right answer is fireworks exploding.

5. The right answer is All of the above.

6. The right answer is combining oxygen gas and hydrogen gas to form liquid water.

7. The right answer is gas is produced.

8. The right answer is The compound may or may not be poisonous, depending on the chemical properties of the new substance.

9. The right answer is This is a physical change, because the two substances were separated physically by boiling.

10. The right answer is C. The tablet that was placed in the water interacted  ... chemical change.

11. The right answer is B. Energy is either released or absorbed.

12. The right answer is that we should compare both physical and chemical properties of these two substances : if they have the same properties, it means that it is the same substance, if not, they are different substances.

13. The right answer is A. Flammability.

14. The right answer is Column.

15. The right answers are Melting point, conductivity, solubility, malleability, density.

16. The right answer is oxidation, flammability, combustibility.

17. The right answer is A. Arrangement of protons in the nucleus.

Chemistry
Step-by-step answer
P Answered by PhD
So basically, the change in color effects the amount of cations in the solution making it a physical change rather than a chemical one, defying the law of conservation of mass! I hope this helped! (The only time the change in color affects the amount of cations is in the Alkaline Earth Metals)

source: college science teacher 
Chemistry
Step-by-step answer
P Answered by PhD
So basically, the change in color effects the amount of cations in the solution making it a physical change rather than a chemical one, defying the law of conservation of mass! I hope this helped! (The only time the change in color affects the amount of cations is in the Alkaline Earth Metals)

source: college science teacher 
Biology
Step-by-step answer
P Answered by Master
Rocks can oxidize in heat and the minerals can cause the rock to crack and break off .

slaking is physical weathering because the rock is still the same, but its wet.

chemical weathering would happen the most quickly in the amazon rainforest.

chemicals in water dissolving minerals in rock is chemical weathering.

erosion removes fertile topsoil, is caused mainly by wind and water, and can decrease revenue from agriculture.

erosion can be reduced by planting trees and contour plowing.

runoff happens when the ground cannot absorb anymore water is a true statement.
 

 
Chemistry
Step-by-step answer
P Answered by PhD

 Event 1 is an example of a physical change and Event 2 is an example of a chemical change.

Explanation: Physical change is one in which there is no change in chemical composition of the substance. There is only a change in phase change.

Chemical change is a change in which there is a change in chemical composition and there might or might not be a phase change.

On Boiling, the water molecules remain bonded in the same form and only covert from liquid to gaseous form, thus is a physical change.

On Rusting of iron nail, the iron changes to iron oxide by combining with oxygen, there is a rearrangement of atoms and thus is a chemical change.

Fe+O_2+H_2O\rightarrow Fe_2O_3.xH_2O

Biology
Step-by-step answer
P Answered by Specialist
Rocks can oxidize in heat and the minerals can cause the rock to crack and break off .

slaking is physical weathering because the rock is still the same, but its wet.

chemical weathering would happen the most quickly in the amazon rainforest.

chemicals in water dissolving minerals in rock is chemical weathering.

erosion removes fertile topsoil, is caused mainly by wind and water, and can decrease revenue from agriculture.

erosion can be reduced by planting trees and contour plowing.

runoff happens when the ground cannot absorb anymore water is a true statement.
 

 

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