Answer:
im sorry for being mean goodbye im get the real answer
Explanation:
Answer:
Sunita will change the variable water.
Explanation:
Sunita have to change the variable water to perform this experiment of diffusion.This is because she is going to predict that more water she uses longer the time needed for the dye to spread through it.
As a result she is increasing the amount of water to observe the effect of diffusible substance on diffusion with time.
Answer:
As the temperature of the water increases, the time needed for the dye to spread decreases. This is because the kinetic energy between the liquid particles increases, therefore helping the dye to dissolve and spread throughout the water.
Explanation:
Answer: 
is the reducing agent
Explanation:
Oxidation reaction : When there is an increase in oxidation state number.
Reduction reaction : when there is a decrease in oxidation state number.
Fe has undergone oxidation, as its oxidation state is changing from+2 to +3.
Mn has undergone reduction, as its oxidation state is changing from +7 to +2.
The chemical agent which itself get oxidized and reduce others is called reducing agent. is a reducing agent.
The chemical agent which itself get reduced and oxidize others is called oxidizing agent. 
is an oxidizing agent.
.
