Why does a hot air balloon rise when the air inside it is heated

Which type of bond occurs when there is a sharing of valence electrons? ionic bond covalent bond metallic bond

Which planet is about 10times as far as earth is from the sun

A chemist adds 345.0 mL of a 0.520 mol/L of a barium chlorate solution to a reaction flask. Calculate the mass in grams of barium chlorate the chemist has added to the flask. Round your answer to significant digits.

The atoms of a metalloid have 6 valence electrons. The metalloid is used as a semiconductor. Which best describes the electron shell in which the valence electrons are located?

A quantity of NaCl was dissolved in 100 cm of solution to obtain 0.5M NaCl solution. Calculate the mass of NaCl used [Na=23.0, CI=35.5]

What is the molar mass of an unknown hydrocarbon whose density is measured to be 1.97 g/l at stp?

Which is an example of flow of heat through conduction

Which of the following is an extensive physical property of matter? volume viscosity odor density

When is Ksp determined for a system?

What is the average surface temperature of Uranus