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WorksheetsB 2 Chemical Bonds
Total questions: 25
Worksheet time: 13mins
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
Ionic bonds form when atoms
Gain or lose electrons
Gain or lose protons
Share protons equally
Share electrons unequally
What usually forms a positive ion?
Metal
Nonmetals
None
What usually forms a negative ion?
Metal
Nonmetals
None
When elements form covalent bonds
Electrons are lost
Electrons are shared
Protons are gained
Protons are shared
What is a valence electron
An electron that is found in the outermost shell of an atom
An electron found in the middle shell
An electron found in the innermost shell of an atom
How many electrons are needed to meet the octet rule?
2
6
4
8
Ionic bonds include which of the following characteristics (Select ALL that apply)
Low melting point
High melting point
Water solubility (dissolves in water)
Electrical conductivity (when in water)
Covalent bonds include which of the following characteristics (Select ALL that apply)
Low melting point
High melting point
Water solubility (dissolves in water)
Electrical conductivity (when in water)
Predict the bond that will form between Be and F.
Covalent
Ionic
Predict the bond that will form between Se and Cl.
Covalent
Ionic
Are atoms more stable when they are bonded together or when they are apart?
apart
bonded together
atoms have a _ charge
positive
negative
neutral
ions have a _ charge
positive
negative
neutral
positive or negative
A magnesium ion has a net charge of +2. A fluorine ion has a net charge of -1. What is the chemical name of this compound?
Magnesium fluoride
Magnesium difluoride
Dimagnesium fluoride
Magnesium flourate
A carbon atom has 4 valence electrons. An fluorine atom has 7 valence electrons. What is the chemical name of this compound?
Carbon tetrafluoride
Tetracarbon heptafluoride
Heptafluoride tetracarbon
Carbon fluoride
