[Answer] 10. All carbohydrates contain carbon, hydrogen and oxygen. All proteins contain carbon, hydrogen, oxygen and what other element?

Step 1 : Introduction to the question "10. All carbohydrates contain carbon, hydrogen and oxygen. All proteins contain carbon, hydrogen, oxygen and what other element?"

...1. Nitrogen 2. Fluorine 3. Sulphur 4. Chlorine They are the only main food component that contains an extra element.

[Answer] 3. How many bonds can a carbon atom form?

Step 1 : Introduction to the question "3. How many bonds can a carbon atom form? "

...1. 3 2. 4 3. 2 4. 1 Carbon is an element of group IVA of the periodic table, and therefore it has four valence electrons. This means that it can have up to 4 covalent bonds. (example CH4 - One carbon atom has combined with 4 hydrogen atoms, which can only form one bond each).