Quiz 1

Why is each element unique and different from other elements in chemical properties?

Each element has a unique number of protons in its nucleus.

Nitrogen (N) is much more electronegative than hydrogen (H). Which of the following statements is correct about the atoms in ammonia (NH3)?

Each hydrogen atom has a partial positive charge; the nitrogen atom has a partial negative charge.

Which of the following would be regarded as compounds?

H2O and CH4, but not O2

Which bond or interaction would be difficult to disrupt when compounds are put into water?

covalent bond

When two atoms are equally electronegative, they will interact to form

nonpolar covalent bonds.

Compared with 31P, the radioactive isotope 32P has

one more neutron.

In the term trace element, the modifier trace means that

the element is required in very small amounts.

What is the maximum number of hydrogen atoms that can be covalently bonded in a molecule containing two carbon atoms?

6

The atomic number of nitrogen is 7. Nitrogen-15 is heavier than nitrogen-14 because the atomic nucleus of nitrogen-15 contains how many neutrons?

8

In comparing covalent bonds and ionic bonds, which of the following would you expect?

Covalent bonds and ionic bonds occupy opposite ends of a continuous spectrum, from nearly equal to completely unequal sharing of electrons.

What is the difference between covalent bonds and ionic bonds?

Covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the electrical attraction between atoms.

Which statement is true of all atoms that are anions?

The atom has more electrons than protons.

Which of the following is not considered to be a weak molecular interaction?

a covalent bond

Which of the following explains most specifically the attraction of water molecules to one another?

hydrogen bond

A covalent chemical bond is one in which

outer-shell electrons of two atoms are shared so as to satisfactorily fill the outer electron shells of both atoms.