Chemistry, 24.06.2019 13:00 myiacoykendall
Observation use your senses to make an observation of your environment. questions create a hypothesis that can be tested in an experiment. remember, a hypothesis has a specific "if-then" wording. it describes what will happen to the dependent variable when changes are made to the independent variable. for example, "if a plant is fertilized (independent variable), then it will grow faster (dependent variable)." design and plan an experiment. be sure to identify an independent variable, a dependent variable, and any controls. remember, controls are factors which stay the same. in an experiment designed to test the previously stated hypothesis, one control would be to use the same kind of plant. write a complete description of your experiment. include a list of necessary materials. it is a good idea to follow a step-by-step procedure format. think of everything you need to do, then write it down in the order it must be completed. your description and procedure should be clear enough that another person could duplicate your experiment exactly. , at least 1 paragraph !
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Chemistry, 22.06.2019 01:00
Look at the bean data from days 4β6. use these data to explain how natural selection changed the number of dark red walking beans over time. writing part
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Chemistry, 22.06.2019 05:40
Salicylic acid is a very important acid. it is used to synthesize the aspirin by treating with acetic anhydride. a 0.2015-g sample of salicylic acid was dissolved in a 100.00-ml volumetric flask, and the solution was diluted to the mark. a 10-ml aliquot of this solution was titrated with standard naoh (0.01130 + 0.2% n) to a phenolphthalein faint pink color end point at 19.81 ml. (a) (calculate the normality of the salicylic acid solution used in the titration. (b) assuming the salicylic acid is pure, what is the equivalent weight of the salicylic acid? practice problems for the final exam (continued) (c) (calculate the inherent error in the determination of the equivalent weight you calculated in part (b). use the following absolute errors in the equipment /glassware when calculating the inherent error. 5.00-ml pipet: + 0.02 ml 100-ml volumetric flask: + 0.08 ml analytical balance: + 0.2 mg 25-ml buret: + 0.03 ml
Answers: 2
Chemistry, 22.06.2019 08:30
Which metal exist in liquid state and can be cut with knife ?
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Observation use your senses to make an observation of your environment. questions create a hypothesi...
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