When vinegar, an acld, is mixed with baking soda, a base, the reaction is similar to the reaction of Alka-Seltzer and water, a salt, water and carbon dioxide are produced. In two or more complete sentences, describe how your
knowledge of balancing chemical equations can help you to determine the missing compound. Write your answer in the
essay box below.
NaHCO3 + HC H30,-
+ H2O + CO2

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

he would use the colour black