12. the bubbling that you observed indicated the production of what gas as a result of the enzymatic
reaction?

As a result of enzymatic reaction  bubbles of oxygen gas are produced in the form of foam

Explanation:

 Living Cells produced an enzyme called catalase. The enzyme catalase breakdown hydrogen peroxide. This is well understood by an equation

                                 2 H2O2     catalase  2 H2O +  O2+  

In a solution the enzyme catalase activity can be measured by the production of Oxygen gas bubbles out in the form of foam. When H2O2 added in a catalase solution  and leave it for  certain time period,the foam height rises in the test tube,it can be measured. The greater the foam height the enzyme catalase activity will also be greater.

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.