Matter Review

An atom of the element Oxygen is different from all other elements due to the number of ______ in the nucleus.

Which subatomic particles are added together to find the atomic mass?

• protons and neutrons

• electrons and protons

• neutrons and electrons

Which of the following statements about protons and neutrons is false?

• Protons carry a positive charge, while neutrons are neutral.

• Neutrons and protons have approximately the same mass.

• Every atom has exactly the same number of protons and neutrons.

• Protons and neutrons both are located inside the nucleus.

Atoms of the same element are basically alike, though they may have a different number of neutrons.

• True

• False

Capitalization matters when writing a chemical symbol.

• True

• False

What is the atomic mass of sodium?

• 11

• 23

• 13

• 33

O, Na, and S are examples of (a)   . Options: chemical equations, chemical formulas, chemical symbols, subscripts. Answer: (b)   .

• chemical equations

• chemical formulas

• chemical symbols

• subscripts

Which of the following is the main difference between elements and compounds?

• Compounds are mixtures.

• Elements are made of only 1 type of atom.

• Compounds are made of only 1 type of atom.

Two or more atoms of different elements combined and held together by chemical bonds form a(an) ________.

• compound

• mixture

• element

• solution

Two hydrogen atoms chemically combine with one oxygen atom to form _________.

• O2

• H2O2

• H2

• H2O