How many moles of He are in 16g of the element

Calculate the number of moles in 456 g of lead, Pb

How do electrons move between atoms to create electricity?

A car and truck are traveling at the same speed. Which has greater momentum? Why?

Water (2350 g) is heated until it just begins to boil. If the water absorbs 5.83*105 J of heat in the process, what was the initial temperature of the water? Express your answer with the appropriate units.

Are physical properties and chemical properties characteristics used to describe matter

How many grams of F - must be added to a cylindrical water reservoir having a diameter of 2.02 * 102 m and a depth of 87.32 m?

How do you know when it's the same element?

What is the difference between a pure substance and a mixture? How are the atoms different?

Best example of an isolated system in chemistry apex

Write the net ionic equation for the chemical reaction shown. Include physical states. HClO2 (aq) + NaOH (aq) ⟶H2O (l) + NaClO2 (aq)