QUESTION 2 2.1
The number of bacteria in the samples need to be quantified. The laboratory uses a specific
protocol where the dilution factor on the spread plates must be:
10^-3 10^-4 10^-5

Describe how you would prepare the required dilution series using the least amount of dilution
water.

2.2
Calculate the amount of bacteria in the sample from the following results (show the steps in
the calculation):
Dilution factor count
10^-3 289
10^-4 31
10^-5 2

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the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.