True or false: Chemical reactions can be detected by the formation of a gas.

The surface ocean currents move heat energy away from where?

For a total mass of water weighing 190 g, the mass of h is 21 g and the mass of o is 169 g. what is the percent composition of h in water

Use the periodic table to determine the electron configuration for aluminum (al) and arsenic (as) in noble-gas notation.

Complete combustion of a 0.350 g sample of a compound in a bomb calorimeter releases 14.0 kJ of heat. The bomb calorimeter has a mass of 1.20 kg and a specific heat of 3.55 J / (gi°C). If the initial temperature of the calorimeter is 22.

Which group of the periodic table contains atoms with a stable outer electron configuration

Two clear solutions are placed in separate beakers. The first solution has a pH of 4, and the pH of the second solution is unknown. If the two solutions are mixed and the resulting pH is 5, the second solution must have

Based on its location on the periodic table, which element (s) have properties similar to N? Choose all that apply. * P C O Bi

What conclusion can be drawn from the statement that an element has low electron affinity, low electronegativity, and a low ionization energy?

A scientist performs an experiment in which a radium-226 (Ra-226) atom decays into radon-222 (Rn-222). The scientist concludes that some energy must have been added to the system to cause this reaction to begin.

Which suitable method can be used to separate a mixture of sand and paraffin