Which of these suggest that a chemical reaction may be occurring?
Which of these suggest that a chemical reaction may be occurring?
The correct options are
A Change of colour
B Change of state
C Reduction of temperature
D Release of a gas
There are several observations which can identify that some chemical reactions have taken place within a system.
Change in temperature
-Usually, when a reaction takes place, heat will be absorbed or released which results in a temperature change.
-eg:If put a piece of sodium in water. we will feel or observe that the temperature is increased.
Change in colour
-Sometimes we see a colour change in the media when a reaction takes place.
Emission of gas
-Sometimes, when a reaction takes place, a gas is emitted from the system.
-eg: If we put a piece of sodium in water, we will observe that a gas is emitted as shown by the formation of bubbles.
Smell or odour
-When some reactions take place, the formation of some substances can give us a smell or odour.
A
Change of colour
B
Change of state
C
Reduction of temperature
D
Release of a gas
There are several observations which can identify that some chemical reactions have taken place within a system.
Change in temperature
-Usually, when a reaction takes place, heat will be absorbed or released which results in a temperature change.
-eg:If put a piece of sodium in water. we will feel or observe that the temperature is increased.
Change in colour
-Sometimes we see a colour change in the media when a reaction takes place.
Emission of gas
-Sometimes, when a reaction takes place, a gas is emitted from the system.
-eg: If we put a piece of sodium in water, we will observe that a gas is emitted as shown by the formation of bubbles.
Smell or odour
-When some reactions take place, the formation of some substances can give us a smell or odour.
