B 2 Chemical Bonds

Most substances are

• elements

• compounds

• metals

• nonmetals

All compounds are made of

• Atoms of two or more elements

• Two or more atoms of the same element

• Atoms arranged in a crystal

• Atoms joined by covalent bonds

The 4 in the chemical formula CH₄ means there are

• Four carbon atoms to one hydrogen atom

• Four carbon and four hydrogen atoms

• Four hydrogen atoms to one carbon atom

• Four total carbon CH combinations

The 3 in the chemical formula 3H₂O means there are

• Three hydrogen atoms to two oxygen atoms

• Three hydrogens and three oxygen atoms

• Six hydrogen atoms to one oxygen atom

• Three total H2O combinations

The 2 in the chemical formula SO₄-² means there are

• Two electrons have been lost

• Two sulfur and two oxygen atoms

• Two electrons have been gained

• Two total SO4 combinations

An atom becomes a positive ion when it

• Is attracted to all nearby atoms

• Gains an electron from another atom

• Loses an electron from another atom

• Shares an electron with another atom

An atom becomes a negative ion when it

• Is attracted to all nearby atoms

• Gains an electron from another atom

• Loses an electron from another atom

• Shares an electron with another atom

What parts of atoms combine to form different compounds with different properties?

• Electron clouds

• Neutrons

• Elements

• Protons

Ionic bonds are formed between

• Metal and metal

• Metal and nonmetal

• Nonmetal and nonmetal

Covalent bonds are formed between

• Metal and metal

• Metal and nonmetal

• Nonmetal and nonmetal