Question

biology 114 - practice exam #1
8. what type of bond forms between two atoms when one atom donates an electron to another atom?
a) hydrogen bond
b) covalent bond
c) ionic bond
d) van der waals forces
9. what does the atomic symbol c - 12 represent?
a) carbon with 12 neutrons
b) carbon with 12 protons
c) carbon with 6 neutrons
d) carbon with 6 protons and 6 neutrons
10. how do you calculate the atomic mass of an element?
a) subtract the number of electrons from protons
b) multiply the number of protons by neutrons
c) the number of protons only
d) add the number of protons and neutrons

Explanation:

• For question 8, an ionic bond is formed when one atom donates an electron to another, creating oppositely - charged ions that attract each other.
• For question 9, C - 12 represents carbon - 12 isotope. Carbon has an atomic number of 6 (6 protons), and the mass number 12 is the sum of protons and neutrons, so it has 6 neutrons.
• For question 10, the atomic mass of an element is calculated by adding the number of protons and neutrons in the nucleus of an atom of that element.

Answer:

1. c) Ionic bond
2. d) Carbon with 6 protons and 6 neutrons
3. d) Add the number of protons and neutrons