Chemical Bonding test

MULTIPLE CHOISE

1.What happens when a covalent bond is formed?

A. Electrons are transferred from one atom to another

B. Electrons are shared between two atoms

C.Protons are transferred from one atom to another

D.Protons are shared between two atoms

2.When magnesium makes an ionic bond with oxygen it loses two electrons. What is the charge on the magnesium ion?

a. -2

b. 0

c. +2

d. +1

3.What type of bond is found in ammonia, NH₃?

a. ionic

b. hidrogen

c. covalen

d. dative

4. What are all atoms trying to achieve when they bond with other atoms?

a. To lose all of their protons

b.To lose all of their electrons

c.To have a full shell of protons

d.To have a full shell of electrons

5. How many electrons are shared between the two atoms of a hydrogen molecule, H₂O (Atomic number=1)

a. 1

b. 2

c. 3

d.4

6. How many electrons are shared between the two atoms of a nitrogen molecule? (Atomic number = 7)

a. 2

b. 4

c. 6

d. 8

7. What kind of structure is found in diamond?

a. Giant molecular

b. simple molecular

c. ionic

d. covalent

8. Graphite the only non-metal element that is able to conduct electricity. How can it do this?

a. It has a regular arrangement of 4 covalent bonds from one atom of carbon to 4 other atoms

b. It has free electrons floating between sheets of covalently bonded carbon atoms

c. It has free electrons floating around fixed positive carbon ions

d. It is made up of ions that are able to move through the lattice

9. Which of the following descriptions of metallic bonding is true?

a. Metallic bonding consists of a sea of electrons floating around fixed cations

b. Metallic bonding consists of a sea of electrons floating around fixed anions

c. Metallic bonding consists of thousands of atoms held together by shared pairs of electrons

d. Metallic bonding consists of lots of ions being held together in a lattice

10. The melting point for a compound is 1570^oC. Which type of bonding is present in the compound?

a. ionic

b. covalent

c. hidrogen

d. dative