What does the root a- or an- mean? 

Isotopes have the same number of:

This root means back:

Magnesium chloride (MgCl2) is a salt that dissolves in water. What type of bond is found within MgCl2? Use the images provided to help you answer the question.       

Water has a higher specific heat capacity than aluminum (Al). If you had the same amount of each of these substances, which one would require the most energy input for you to observe a temperature increase?

Which of the following statements concerning saturated fats is false?

Give an example of a word that uses the root ceph. 

The choices below list different levels of biological organization. Which listed level of organization includes all of the other levels in the list?

Which root means toward?

Give an example of a word that uses the root ex- or ec-.