ANSWERS

Answers to Chemicals "Test Yourself"
1.	What is the difference between an atom and a molecule? ''An atom is the simplest building block of matter – elements are made of atoms. Molecules are made of atoms joined together.''

2.	What is the chemical name for baking soda? And its formula?

Sodium Bicarbonate: NaHCO3

3.	Write the equation for carbonic acid splitting into water and carbon dioxide.

H2CO3	=   CO2	+	H2O

4.	A solution of table salt in water is an example of an electrolyte. What ions are present in this solution?

Na+ and Cl-	(also H+ and OH-)

5. What element is always present in proteins but not usually in fats or carbohydrates?

Nitrogen

6.	List three differences between glucose and glycogen.

Glucose is a monosaccharide, glycogen is a polysaccharide (and a much bigger molecule); glucose is sweet to taste and dissolves in water, glycogen is not sweet and is insoluble; glucose is used for energy whereas glycogen stores energy.

7.	Which will provide you with the most energy – one gram of sugar or one gram of butter?

Fats provide approximately 2.5 times more energy than carbohydrates – so the butter wins hands down!