Aluminium and iron both produce oxides in the air.
How does this affect their mass?
The mass of iron on which the oxide forms eventually decreases. Why is this?How does dipping an iron bucket in molten zinc protect it?
Answers
Answer:
Grades Nine Through Twelve
3. g.* Students know how to identify reactions that involve oxidation and reduction and how to balance oxidation-reduction reactions.
8. Chemical reaction rates depend on factors that influence the frequency of collision of reactant molecules. As a basis for understanding this concept:
a. Students know the rate of reaction is the decrease in concentration of reactants or the increase in concentration of products with time.
b. Students know how reaction rates depend on such factors as concentration, temperature, and pressure.
Independent variable
Dependent variables
Controls
Series
Kind of Nails (Finishes)
Nails' Mass
Temperature (80F)
Time (10days)
With water
Without water
Materials
Procedures
Three kinds of nails
Bright nail
Coated nail
Galvanized nail
Six testtubes
One testtube stand
Calcium chloride
Electrical balance
Meausre the mass of two nails of each kind.
Put the nails into the testtubes.
For the series of 'Immersed', fill the testtube half with tab water and measure the total masses.
For the seiries of 'Dry', wrap a small amount of calcium chloride with a piace of tissue, and then put the tissue into the mouth of the testtubes.
Allow the testtubes to rust for two weeks.
After two weeks, mesuare the change in the mass of each nail.
Calculate the rates of each nail's rusting by dividing the the changes in mass by the time(day
Answer:
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