120 students took a chemistry test. 22 scored a 90.55 scored an 80, 12 scored a

70, 11 scored a 60, and 20 scored a 50. Calculate the weighted average of the test

scores.

Quartz, gold and calcite are examples of what

If we mix 25 grams of sodium bromide with a large amount of potassium chloride, what will our theoretical yield of sodium chloride be? The equation to solve it is NaBr + KCl - > NaCl + KBr

Describe how ionic compounds form crystals

Creating a prototype and troubleshooting o are steps in the development of ___? A. a new scientific theory B. A new experiment C. A new scientific law D. A new technology

How many significant figures are contained in each of the following measurements? (a) 38.7 g (b) 2 x 1018 m (c) 3,486,002 kg (d) 9.74150 x 10-4 J (e) 0.0613 cm3 (f) 17.0 kg (g) 0.01400 g/mL

It is easier to push a sofa across a rough surface like carpet than a smooth surface like a hardwood floor. True False

Which of the following is not equal to 0.536 kilometers? 53.6 hectometers (hm) 536 meters (m) 536,000 millimeters (mm) 53,600 centimeters (cm)

Which theory states that our inner planets are rocky because rocks and metals combine at extreme temperatures, while the outer planets are gaseous because hydrogen compounds condense at colder temperatures? Hubble Doppler Kepler Nebular

Most air pollution come from a) pollen b) forest fires c) volcanic eruptions d) burning fossil fuels

How many neutrons does a calcium 48 isotope have