Explanation:
Julian should use the ordinary wooden ramp and wooden block as the control . A control group is usually not priority of the experiment. It is used to understand an experiment better.
- The control in this experiment can be just the ordinary wooden ramp and the blocks.
- He should time the rate at which the blocks slides down the ramp.
- This will be a perfect control in the experiment and it can give information about how the blocks will fare ordinarily without any lubricant.
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Helium, bromine, agron, neon,flourine
28. unbalanced because in reactant side the Aluminium is 1 and oxygen is 2 but in the product side the Aluminium is 2 and oxygen is 3 it is not equal so it is unbalanced equation
29. unbalanced because the oxygen atom are not equal in the reactant and the product side
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