8TH GRADE

Explain the scientific method.

In your explanation, be sure to include how• the steps of the scientific method • different types of variables and control• purpose of the steps • why a conclusion is important

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Convince a friend that the scientific method is important.

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Analysis of your Graph

Use the data from the line graph you created to answer the following question.

Part A What is the trend of the data?

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Part B Using words and/or numbers explain why you think this trend occurred.

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Look at the graph on the overhead. Your teacher has gotten very tired and left some important criteria out of the graph. Explain what needs to be added to the graph and why it should be included.

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Explain how heat energy affects a substance. In your explanation, besure to include

• the temperatures at which a substance changes states of matter

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Alison and Greg are looking at the sky and notice that there is a full moon. Alison tells Greg that they are only seeing ½ of the moon, but Greg disagrees and thinks they are seeing the entire moon. Is Alison or Greg correct? Explain using scientific terminology and a description of the phases of the moon.

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After the beaker containing Mixture 4 was sealed, the iron filingschanged color.

Compare the mass of the mixture in the sealed beaker to the massesof the iron filings and water before they were mixed. In your comparison, be sure to include

• the law of conservation of matter• evidence from the data table

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A student mixed two substances together and concluded that a chemical reaction had taken place.

Explain how the student was able to conclude that a chemical reaction occurred. In your explanation, be sure to include

• evidence that would support the student’s conclusion

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Describe three ways chemistry relates to your life.____________________________________________________________________________________

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Compare the properties of oil to the properties of the elements in oil.In your comparison, be sure to include

• the properties of oil• the properties of the elements in oil• the motion of the molecules in oil, carbon, and hydrogen

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Suppose you stir a small amount of baking soda into a glass of water until the water looks clear again. Identify how you could prove to someone that the clear material is a mixture.

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Students measured the movement of a person with a motion detector.Their data is shown on the graph below.

Describe the movement indicated by the motion detector from0 seconds to 8 seconds. In your description, be sure to include

• the distance traveled and the time elapsed for each labeled section

• a comparison of the velocity in each section

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The graphs below represent the motion of two objects, A and B.

Describe the types of motion represented by the two graphs. In your description, be sure to include

• the type of motion represented by each graph• the difference between the two types of motion

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Design an experiment to demonstrate and explain the relationship between displacement, velocity, acceleration, and time.

Include sketch of set up, procedures, materials, measurements that need to be taken, data that will be collected, sample graphs, and conclusions that will be drawn.

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Explain how environmental conditions affect the population cycles ofwetland organisms. In your explanation, be sure to include

• the relationship between the amount of precipitation and the

number of trees• the relationship between the amount of precipitation

and thenumber of frogs

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A city might switch from buses that burn fossil fuel to buses that burnB20 diesel fuel. The data table below shows the average kilometers per liter (kpL) of a bus burning B20 diesel and of a bus burning fossil fuel for a seven-month period. The B20 diesel fuel costs more than the fossil fuel.

Evaluate the best type of fuel to use in the city buses. In your evaluation, be sure to include

• advantages and disadvantages for each fuel• supporting evidence from the data table and the

technical passage

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During one year the algae population decreases in the Chesapeake Bay. Below is a partial Chesapeake Bay food chain.

Explain how a large decrease in the algae population will most likely impact the bay ecosystem. In your explanation, be sure to include

• the roles of the organisms in the partial Chesapeake Bay food

chain• the possible effects of a decrease in the algae

population on theplant and animal populations

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The diagram shows the relationships among organisms in an ecosystem.

Explain how organisms in this ecosystem compete for resources. In your explanation, be sure to include

• the animals that compete for the same food source• why the plants and animals compete for water

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BeesFlorida has more than 250,000 bee colonies. Half of them are moved to the northern states in the summer. Florida is one of the nation's top producers of honey. Bees must know a lot about geometry. Their honeycombs are perfect six-sided cells. In winter, bees flap their wings inside the hive to keep it warm. The hive can have a temperature of 91oF to 97oF. Bees that find food (nectar) return to the hive and do a “waggle” dance. This dance tells other bees the distance, direction, quality and quantity of food at the nectar source. Worker bees are all female. They can fly as far as 3 ½ miles from their nest to find food. Their top speed is 15 mph. A typical bee colony contains 20,000 to 30,000 bees. In one year, a colony can collect more than 260 pounds of nectar that will be converted into honey.

What would happen if honey bees disappeared? What percentage of the agricultural crops produced would we lose? What types of Florida commodities would become unavailable as a result?____________________________________________________________________________________

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