Calculations
Atoms
Periodic Table
Compounds
Molecules
100
Density is the ratio of _________ to _________.
mass to volume
100
Name a type of chemical change?
rusting
100
A positively charged particle in an ionic compound is referred to as a:
cation
100
All atoms of the same element have the same ___________.
atomic number
100
Lewis structures show the:
Shape of the molecule and how many bonds it has
200
How many octet electrons does HBr have?
10
200
An ionic compound consist of
metals and non-metals
200
Electrons in the atom’s outermost orbitals are called ___________.
valence electrons
200
What particles form the nucleus of an atom?
Protons and neutrons
200
In the formation of a covalent bond, electrons are _____.
shared
300
In an ionic bond, electrons are _________.
transferred
300
What is a type of physical change?
melting
300
Which of the following is a property of metals?
The are malleable and are good conductors of electricity
300
A mixture of elements that has metallic properties is called:
an alloy
300
The states of matter are:
solid, liquid and gas
400
How many valence electrons are in CCl4 ?
32
400
An uneven mixture is called a ________________ mixture
heterogeneous
400
Atoms are never created or destroyed. What happens to atoms in a chemical reaction?
They are rearranged
400
Atoms tend to gain, share, or lose electrons in order to achieve a full set of eight valence electrons. This is called:
the octet rule
400
A reaction in which heat energy is lost:
exothermic
500
A reaction in which heat energy is gained:
endothermic
500
What is the maximum number of electrons per orbital?
2
500
_____________ is a new substance formed in a chemical reaction
Products
500
Elements in the same group on the periodic table have _________.
Similar chemical characteristics
500
What is the molecular geometry for CH4
tetrahedral
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