Which of the following have the most similar properties?

A. Sodium (Na) and Magnesium (Mg)

B. Carbon (C) and Silicon (Si)

C. Argon (Ar) and Chlorine (Cl)

D. Potassium (K) and Calcium (Ca)

Which of the following chemicals is implicated in both global warming and ozone depletion? a. chlorofluorocarbons b. sulfur dioxide c. nicotine d. radon

An electron has a charge of - 1.6 * 10-19 c. how many electrons would be needed to produce a net charge of - 5.5 * 10-7 c? round the final answer to one decimal place.

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 is an azeotrope and why does it limit ethanol purity, even with fractional distillation?

Which of the following elements is stable? a. Boron, atomic number 5 b. Carbon, atomic number 6 c. Neon, atomic number 10 d. Fluorine, atomic number 9

Which of the following is not a benefit provided by a social group A. instinct to run from predators B. access to mates C. protecting young D. learning to recognize predators

Why must an air traffic controller know a plane's velocity

Compare and contrast the two kinds of chemical bonds (ionic and covalent)

If a thin and a thick wire are otherwise identical, what property is lower for the thicker wire? 1. current 2. static charge 3. resistance 4. voltage

Which set of numbers gives the correct possible values of l for n = 2?