Yeast is a fungus and needs a supply of energy for its living and growth. Sugar supplies this energy. (Your body also gets much of its energy from sugar and other carbohydrates.). Yeast can use oxygen to release the energy from sugar (like you can) in the process called respiration. So, the more sugar there is, the more active the yeast will be and the faster its growth (up to a certain point-even yeast cannot grow in very strong sugar-such as honey).
Molecules are held together by either covalent bonding or ionic bonding. Several types of non-metal elements exist only as molecules in the environment. For example, hydrogen only exists as hydrogen molecule. A molecule of a compound is made out of two or more elements.
Molecules and Compounds. When atoms come together to form ionic or covalent bonds, they form stable associations that change the properties of either atom alone. These new molecules exhibit unique emergent properties. A molecule exists when two or more atoms join together by forming chemical bonds. A single molecule can be as small as only two atoms, like the oxygen we breathe, or as large as 5 sextillion (5 with 21 zeroes after it!) carbon atoms, like a 1â2 carat diamond in an engagement ring.