What is the particle of an atom that moves rapidly in a cloud like region around the nucleus

What element has a shorthand configuration of [He]2s^22p^1

Use of fractional distillation?

Carbon monoxide (CO) gas reacts with oxygen (O2) gas to produce carbon dioxide (CO2) gas. If 1.00 L of carbon monoxide reacts with excess oxygen at standard temperature and pressure, what volume of carbon dioxide is produced?

Describe how to make a buffer solution using a strong base and one other reagent.

The diagram shows the scales used for recording temperatures. The labels for the scales are missing. Which labels complete the diagram?

A scientist observed a 5-mL sample of an unknown substance. It is a blue liquid with a density of 1.2 g/cm. the substance reacts with carbon dioxide.

9.87 g of calcium sulfate and 12.05 g of potassium react. What is the total amount of potassium sulfate that can be produced?

What volume of water vapor measured at STP is produced by the combustion of 4.00 g of natural gas (CH4) ? (you must write and balance the equation first)

How many moles of 0.225 m ca oh 2 are present in 0.350 l of solution

A solute and a solvent are mixed together. What requirement would enable you to predict the the substances would form a homogeneous solution?