What element is being reduced in the following redox reaction? C 5H 12O 2( aq) + NaMnO 4( aq) → C 5H 6O 4Na 2( aq) + MnO 2( aq)
C
Na
O
Mn
H

Which of the following processes shows a decrease in entropy of the system?
2 CO(g) + O2(g) → 2 CO2(g)
COCl2(g) → CO(g) + Cl2(g)
CH3OH(l) → CO(g) + 2 H2(g)
NaClO3(s) → Na+(aq) + ClO3-(aq)
None of these will show a decrease in entropy.

the answer is a. co2, this would be colder than the : )

explanation:

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance