While working in the lab, Shelia masses 20g of sodium hydroxide on the triple beam balance then masses 20g of sodium bicarbonate. Both are white powders, but they react to other chemicals in very different ways. Shelia is not certain which white powder is the sodium hydroxide. What should she do?

Students were asked to observe pond organisms in a Petri dish. At the end of class, which of these is the MOST appropriate clean-up method?

Which of the following strategies will BEST help conserve trees that are used to make paper pulp?

Which of the following trash items, often found in landfills, is MOST LIKELY to cause dangerous chemicals to soak into the soil and water, and thus, should be not be disposed of in landfills?

A biologist was reviewing records of the sizes of screech owl and field mouse populations in one area over a period of 80 years. Which of these would be the BEST way for the biologist to display this data together to show the relationship between these populations?

A scientist wants to classify organisms by name, as extinct, endangered, or threatened. The BEST way to organize this information is a

A student wants to make a display that will show all of the different energy sources for the United States. Which display would make it easiest to compare the amount of energy coming from each source and would show that the sources add up to 100 percent of the energy used in the United States?

Mrs. Johnston heated 5 grams of sugar. The sugar first looked shiny, then melted and became dark brown. Finally, all that was left was a black, shiny substance. She then heated 5 grams of sand in the same way. The sand’s appearance did not change. What explains these results?

Which water conservation technique is most important during the month of August?

Crackers are made of complex carbohydrates. When you put a cracker in your mouth and leave it there without chewing, it eventually starts to taste like sugar. Why would a cracker begin to taste like sugar?