Select the equations below that represent physical changes.

Choose one or more:
A.
2 H2O(l) → 2 H2(g) + O2(g)
B.
H2O(l) → H2O(s)
C.
CO2(s) → CO2(g)
D.
H2(g) → 2 H(g)

Question

08-09-2018
Chemistry

contestada

Select the equations below that represent physical changes.

Choose one or more:
A.
2 H2O(l) → 2 H2(g) + O2(g)
B.
H2O(l) → H2O(s)
C.
CO2(s) → CO2(g)
D.
H2(g) → 2 H(g)

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Asgardian Asgardian · Answer 1 · 2018-09-18T05:11:10+02:00

Physical changes- any change in the physical properties of the substance is a physical change. Generally physical properties include color, state, size , shape, odour, appearance . In any phyical change, no new substance is formed.

Chemical changes- any change in the chemical properties of the substance is a chemical change. Chemical properties changes only when something new is formed during a reaction.

∴ Part A- 2 H2O(l) → 2 H2(g) + O2(g)

In this, H2 and O2 is produced during the reaction which is different from H20. Thus, it is a chemical change.

Part B- H2O(l) → H2O(s)

In this, only the state of water changes from liquid to solid and no new product is formed. Thus, it is a physical change.

Part C-CO2(s) → CO2(g)

In this also, only the state of CO2 changes from solid to gas and no new product is formed. Thus, it is a physical change.

Part D-H2(g) → 2 H(g)

In this reaction, H2 molecule is dissociated into 2 hydrogen atom leading to formation of new products. Thus, it is a chemical change.

Finally, equations that represent physical changes are - B and C

B. H2O(l) → H2O(s)

C. CO2(s) → CO2(g)

Select the equations below that represent physical changes. Choose one or more: A. 2 H2O(l) → 2 H2(g) + O2(g) B. H2O(l) → H2O(s) C. CO2(s) → CO2(g) D. H2(g) → 2 H(g)

Respuesta :

Otras preguntas

Select the equations below that represent physical changes.

Choose one or more:
A.
2 H2O(l) → 2 H2(g) + O2(g)
B.
H2O(l) → H2O(s)
C.
CO2(s) → CO2(g)
D.
H2(g) → 2 H(g)