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A substance that provides a convenient pathway for a reaction to occur requiring less energy than the activation energy of the reaction.

Real images are formed where two real rays cross, and they can be projected onto a screen. Whereas virtual images are seen where virtual rays intersect, they are imaginary and therefore cannot be projected o...

The photoelectric effect states that electrons are emitted when electromagnetic radiation is shone upon a material. It also provides evidence for the particle-nature of light, since each photon interacts wit...

The heart is a muscle and its primary function is to pump oxygenated blood around the body and to receive deoxygenated blood from around the body. The left and right side have different functions and the hea...

We are looking for what values of x make this statement true. To start we need to factorise the quadratic.We can do this in two ways, the quadratic formula, or just seeing what numbers work.We'll start with ...