A student is designing a device that can be used for communication. Which TWO waves on the electromagnetic spectrum should the student use?

gamma rays

X-rays

ultraviolet waves

microwaves

radio waves

Which are metals? C, Na, F, Cs, Ba, Ni

Which stereoisomer - cis - or trans-1-bromo-3-tert-butylcyclohexane - will react faster in an E2 elimination reaction? Select the single best answer.

Which is the most electronegative element

What is 19 hundred thousandths in scientific notation

In location B, what can you conclude about the sediments carried in the river?

Sound waves travel fastest through? A.) Air B.) Steel C.) Water D.) Vacuum

Which of the following combinations will result in a reaction that is never spontaneous? 1) positive enthalpy change and positive entropy change 2) positive enthalpy change and negative entropy change 3) negative enthalpy change and positive entropy

Which of the formed elements is present in the greatest concentration?

A compound has a percent composition of 24.74% potassium (molar mass = 39.10 g/mol), 34.76% manganese (molar mass = 54.94 g/mol), and 40.50% oxygen (molar mass = 16.00 g/mol).

What would be the saturation concentration (mole/L) of oxygen (O2) in a river in winter when the air temperature is 0°C if the Henry's law constant at this temperature is 2.28 * 10-3 mole/L-atm? What would the answer be in units of mg/L?