Multiple choice

1. An isotope is an atom of an element that varies in mass number due to variation in the number of: (Points: 5) 

atoms. 

protons. 

neutrons. 

electrons. 

2. A covalent bond is: (Points: 5) 

the attraction that one atom has for another atom. 

the attraction between two atoms, formed by the sharing of electrons. 

formed between the positive charge of a hydrogen atom in one molecule and the negative charge of anitrogen atom in another nearby molecule. 

the attraction between a positive ion and a negative ion. 

3. Solutions are always comprised of: (Points: 5) 

solvents and solute. 

liquids and solids. 

water and salts. 

compounds and ions. 

4. Which of the following is a chemical reaction that is also known as digestion? (Points: 5) 

Phosphorylation 

Dehydration synthesis 

Acid-base 

Hydrolysis