An unknown sample weighing 28.26g contain 70% of hydrogen and 30% of carbon calculate the

[1]empirical formula

[2]the molecular formula

[3]give the iupac name of the compound

Which statement describes the law of conservation of energy? All systems will exchange matter and energy with their surroundings. All systems can exchange energy, but not matter, with their surroundings.

If 4 electrons are available to fill three empty 2p atomic orbitals, how will the electrons be distributed in the three orbitals

Why is burning propane gas a chemical reaction? a) The atoms in propane and oxygen rearrange to form other substances after the reaction. b) The atoms that make up propane and oxygen change into different atoms after the reaction.

What is the biggest challenge to carbon dating?

How can you represent the composition of an ionic compound?

During an endothermic phase change, what happens to the potential energy and the kinetic energy?

What is the difference between pure substance, element, and compund

Butane gas is used as the fuel in disposable lighters. It burn in oxygen to form carbon dioxide gas and water vapor. What mass of carbon dioxide is produced when 53.3 g of butane is burned in 103.9 g of oxygen

Suppose a solution was too concentrated for an accurate reading with the spectrophotometer. The concentrated solution was diluted by placing 1.00 mL of the concentrated solution in 4.00 mL of water.

What kinds of scientific investagations involve making observations