Category 1
What occurs between the nonmetal elements whose atoms do not easily lose electrons?
covalent bonding
How many carbon atoms are in this glucose molecule? C6HI206
six
What is the smallest particle into which a covalently bonded compound can be divided and still be the same compound?
molecule
Which of the following is NOT a sign of a chemical reaction? a. gas formation b. solid formation
energy change
What is the name of the three-dimensional pattern that forms when ions bond?
crystal lattice
Why don't noble gases normally form chemical bonds?
They have a full outermost energy level.
Which of the following names a covalent compound?
What occurs when water freezes?
a diatomic molecule
Which of the following chemical equations is balanced?
What are the only parts of an atom that make chemical bonds?
valence electrons
Which type of element is most likely to gain electrons when it forms bonds?
nonmetals
What are the charged particles that form when atoms gain or lose electrons?
ions
Why can metals bend without breaking?
Metals contain constantly moving electrons.
What causes chemical bonds in molecules to break?
when molecules bump into each other with enough energy
What is a molecule made up of two atoms of the same element?
Which of the following is an example of a chemical reaction?
leaves changing colors in the fall
the number of valence electrons
What is the force that holds atoms together called?
What do atoms gain, lose, or share when they bond?
electrons
Helium has a filled outermost energy level. It has _ valence electrons.
2
Which of the following shows an exothermic reaction?
2Na + Cla2 -(arrow- 2NaCI + energy
How many sodium atoms are present inthis molecule? 7 Na 3PO 4
21
Which of the following is the most important indicator that a chemical reaction has taken place?
a new substance with different properties is formed
ionic bond