a)Describe an experiment to test whether soil pH affects the growth rate of sunflowers. Include all of the following: hypothesis, predictions, controlled variables, independent variable, dependent variable. b)If your experimental data support your hypothesis, what are some next steps that you can do? c)What is a control and why are controls critical to experimental design? d) Why is the dependent variable important to any study?

We are doing an experiment on measuring the temperature. We are to measure the temperature of hot water (measure it initially, then wait for 10 minutes then measure again). Additionally, we are to measure the temperature of another water before and after putting ice (measure initially then measure 3 times [every 5 minutes] for 15 minutes). My question are: What law or principles of chemistry could be applied in this experiment? Should we expect the temperature of the hot water to drop? why? Should we expect the temperature of the water to rise or drop after putting the ice? why?

In a gravimetric determination of lead content in brass, there is a constant loss by solubility of 1.55 mg of lead. A sample contains 7.86% by mass lead, and a 0.3514-g sample is used for the analytical determination using the gravimetric method. Calculate the % relative error. *Watch the units. **Provide your answer to two decimal places and without units. Avoid using scientific notation.

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A painting sold for $291 in 1978 and was sold again in 1985 for $459. Assume that the growth in the value v of the collectors item was exponential. Find the value of k of the exponential growth rate. Assume

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How could you describe the changes that happen when carbon changes form from graphite to diamond? A. It is a physical change, but the intensive and extensive properties of carbon will be maintained. B. It is a chemical change, but the intensive and extensive properties of carbon will be maintained. C. It is a chemical change, which could change some of the intensive and extensive properties of the carbon. D. It is a physical change, which could change some of the intensive and extensive properties of the carbon.

1. What pieces of apparatus or equipment are used for measuring: a. Temperature? b. Small amount of liquids? c. Large amount of liquids? d. Mass of a substance? 2. Suggest ways on how to store and handle properly the different glassware to avoid accidents in the laboratory. You can use illustrations to show your idea. 3. Why is the most of the containers of substances and those used for heating are made up of glass rather than metal? 4. Explain why the thermometer should not be shaken rigorously to lower the reading to zero before using it.