During an experiment a thermometer was placed in a beaker containing hydrogen peroxide. the following observations were recorded when yeast granules were added to hydrogen peroxide. observation 1: fizzing and bubbling took place. observation 2: the temperature began to rise. based on the observation, justify the type of change (physical or chemical) that took place.

chemical change

Explanation:

A physical change is defined as a change in which a change in shape, size takes place. No new substance gets formed in these reactions. Example: Melting of ice to liquid water

A chemical change is defined as a change in which there is redistribution of atoms and chemical composition. A new substance is formed in these reactions.

Example: Oxidation of magnesium leads to formation of white magnesium oxide

When yeast is added to hydrogen peroxide, hydrogen peroxide is decomposed into oxygen and water which is a chemical reaction.

Thus as the oxygen gas is released, it leads to bubbles and the heat is released in the reaction , thus the temperature is increased.

in theory, limestone is composed principally of the compound calcium carbonate - caco3, but in reality this compound is deposited in conditions involving a number of other compounds as impurities so it ends up being a mixture of many compounds.

hope this : -)

tony (lordcaos066)

po-215 i got it right on the quiz