Is burnt toaster a chemical or physical change?

Calcium phosphate reacts with sulfuric acid to form calcium sulfate and phosphoric acid. What is the coefficient for sulfuric acid when the equation is balanced using the lowest, whole-numbered coefficients?

Why can an increase in temperature lead to more effective collisions between reactant particles and an increase in the rate of a chemical reaction?

The periodic table shows that a carbon atom has six protons. This means that a carbon atom also has ...

A 675 mL sample of a gas is cooled from 75°C to 25°C at constant pressure. What is the new volume of gas?

Hugh dissolved 2 grams of sugar in 500 grams of water. What was the mass of the solution formed?

What types of matter could be separated by physical methods?

What information does a net ionic equation give that a complete ionic equation does not show

What is the molality of a solution containing 4.0 moles of solute in 3.2 kg of solvent? Round to the nearest tenth. Don't forget the units.

What is the name of a binary compound made up of lithium and chlorine?

A scientist in London and a scientist in California both conducted independent investigations that produced similar results.