Which components can be found in both comparative and experimental investigations, but are never found in descriptive investigations? Check all that apply.

- question

- hypothesis

- variables

- control group

- prediction

- conclusion

Why does salt water conduct electricity when it is passed through?

How could you distinguish octane from 1-octene by a simple chemical test?

What causes ocean water to be warmer at the equator than farther north?

Permanganate and oxalate ions react in an acidified solution according to the balanced equation above. How many moles of CO2 (g) are produced when 20. mL of acidified 0.20 M KMnO4 solution is added to 50. mL of 0.10 M Na2C2O4 solution?

2 Pc What energy transfer is occurring when you make a call on a phone? A. electrical to chemical B. heat to sound C. electrical to sound O OD. chemical to light Reset Selection

Why does the effective nuclear charge increase across a row of the periodic table?

Iodine-131 decays to form xenon-131. the half-life of this reaction is 8.07 days. from a 200-g sample of iodine-131, how much of the sample is xenon-131 after 16.14 days?

Complete the following statement by checking all that apply Creativity allows scientists to develop multiple approaches to solving problems. adapt to changes in scientific knowledge. look at old problems in new ways.

The atomic weight of hydrogen is 1.00794. a. True b. False

Describe What kind of ions do metals form? What kind of ions do nonmetals form?