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

Which non-metal makes up diamond, graphite, and the majority of coal? A. Sodium B. Carbon C. Oxygen D. Magnesium

7. Which would feel warmer to the touch - a bucket of water at 50°C or a bathtub filled with water at 25°C? Which of these contains more energy? Account for any differences in your answers to these questions.

If 0.250 g of a gas sample represents 1.05x10-2 mol, what is the molar mass of the gas?

If there is 0.2 M glucose along with 0.15 M NaCl in solution, what is the osmolarity of this solution? If there is 0.2 M glucose along with 0.15 M NaCl in solution, what is the osmolarity of this solution? 1. 500 mOsm 2. 2.15 Osm 3. 350 mOsm 4. 2.

What indicates a chemical change? A) Change from a liquid to a gas B) Change in the amount of material C) Change in the type of substance present D) Change in the texture of a substance

A reaction starts with 20.0 grams of lithium hydroxide (LiOH) and produces 31.0 grams of lithium chloride (LiCl), what is the percent yield of lithium chloride (LiCl) ? * LiOH + KCl - LiCl + KOH A) 64.5% B) 88.6% C) 81.5% D) 92.8%

You aren't sure if your pH meter needs to be calibrated, so you put it in a buffer solution that has a known pH of 7. You take four separate readings of the solution with the pH meter. The meter reports the pH as 5.5, 8.6, 6.3, and 9.4.

Can you explain and read this equation 2Mg + 02 - - 2MgO

The label of a gas cylinder has come off in your laboratory. You know that only one species of gas is contained in the cylinder, but you do not know whether it is hydrogen, oxygen, or nitrogen.

Give two example of compound that decompose to give off oxgyen gas