The speed of a chemical reaction is affected by temperature, concentration, particle size and the presence of a catalyst. It can be calculated by measuring changes in reactants/products.

This will allow the vent to draw the smoke and vapors produced out of the beaker, enabling the students to watch the reaction without releasing the smoke into the room. After approximately 3 to 5 ...

Chemical reactions make new chemicals. Atoms are rearranged during a chemical reaction, but the number of atoms does not change. Evidence of chemical reactions includes a large temperature change ...

A biochemical reaction is the transformation of one molecule ... which are biological catalysts that can alter the rate and specificity of chemical reactions inside cells.

Anaphylaxis (also called anaphylactic shock) is a severe allergic reaction that makes it difficult for a person to breathe. Anaphylactic shock develops within seconds or minutes of contact with a ...