Question

Question 1.1. Water is an example of ___________, while hydrogen is an example of __________. (Points : 3)
an element; an isotope
an element; an ion
a compound; an element


Question 2.2. Which of the following is the best definition of an element?
chemical substance whose atoms all have the same number of protons
chemical substance that has lost or gained electrons
chemical substance made up of different types of atoms


Question 3.3. Chemical bonds contain energy that can be released when they are broken
True
False

Answer 1

1.1: C

2.2: A

3.3: Pretty sure it's FALSE look here for 3.3 http://sciencequestionswithchris.wordpress.com/2013/06/27/when-does-the-breaking-of-chemical-bonds-release-energy/

Answer 2

Thank you!