WorksheetsAtoms and Ionic Compounds
Total questions: 48
Worksheet time: 43mins
Elements are composed of one kind of atom
True
False
What is the most abundant element on Earth?
(a)
What is the least abundant element on Earth?
(a)
Compounds are made up of two or more elements chemically combined
False
True
What law states that "a given compound always has the same composition regardless of where it comes from"
Law of Constant Composition
Law of Multiple Proportions
Law of Definite Proportions
Law of Conservation of Mass
Every compound has multiple unique formulas
True
False
Formulas represent compounds
True
False
Examples of compounds:
Water, H20 (always two atoms of hydrogen to one atom of oxygen)
A small chunk of matter is made only from Gold atoms. This is an example of a:
Mixture
Compound
Element
Solution
Which of these samples shown best represents an element?
A
B
C
D
Element
Compound
Mixture
Rules for Writing Compounds:
1. each atom is represented by its element symbol
2. the number of each type of atom is indicated by a subscript written to the RIGHT of the element symbol
3. when only one atom of a given type is present, the subscript 1 is NOT written
Each molecule of a compound contains two atoms of nitrogen and five atoms of oxygen, what is the formula?
N2O4
N2O6
N2O3
N2O5
How many hydrogen atoms are there?
1
4
5
6
The number that appears on the bottom right of a chemical symbol indicating how many atoms there are for that element.
subscript
superscript
coefficient
squared
How many hydrogen atoms are in this chemical formula:
4 hydrogen atoms
1 hydrogen atom
2 hydrogen atoms
3 hydrogen atoms
The atom is the basic unit of matter
True
False
What is the smallest particle of an element that retains the characteristics of that element?
Compound
Atom
Molecule
Ion
What is amu?
A measure of units
amu is a type of chemical bond.
Atomic mass unit
Atomic number
What charge does a proton have?
Positive charge
Variable charge
Neutral charge
Negative charge
What charge does a neutron have?
Negative
Positive
Neutral
Variable
What is the correct number of amu for protons, neutrons, and electrons?
Proton: 1 amu, Neutron: 1 amu, Electron: 0 amu
Proton: 2 amu, Neutron: 5 amu, Electron: 2 amu
Proton: 8 amu, Neutron: 7 amu, Electron: 1 amu
Proton: 1 amu, Neutron: 0 amu, Electron: 1 amu
Atoms are electrically neutral- the # of protons equals # of electrons
True
False
Atoms have a charge
True
False
How many protons are in Gold
79
197
118
276
The atomic number is always the number of
protons
neutrons
electrons
What is the atom divided into?
Atoms cannot be divided
Nucleus and electron cloud
Ionic compounds
Particle
What charge does the nucleus of an atom have?
Nucleus
-center of atom
-small and dense
-contains only protons and neutrons
-contains most mass of atom
In the nucleus what # always stays the same?
# of protons + # of neutrons = mass
Mass - # of protons = # of neutrons
Electron Cloud
-located OUTSIDE nucleus
-NOT dense
-NEGATIVELY charged (contains electrons)
-mass of electrons negligible (practically zero)
Determines Reactivity
(a)
Charged particle
Atom
Cell
Ion
Particle
In an ion the # of protons DOES NOT equal the # of electrons
True
False
The only way to form an ion is to _ the # of electrons
(a)
Positive ions =
Negative Ions =
Atom
Cation
Anion
Molecule
Controls behavior in ordinary chemical reactions!!!!
(a)
The charges on the anions and cations in the compound must sum to
Ionic compounds are electrically
Neutral
Positive
Negative
Zero
Ionic compounds have _ boiling and melting points
Ionic compounds form between a _ and a _
Naming Ionic compounds
-write name of the elements that forms that cation
-change the ending of the element that forms the anion to "ide"
Why do ionic compounds have high melting and boiling points?
Their ions are free to move.
Their ions are held in fixed positions.
They have many strong bonds which require a large amount of heat energy to overcome these strong bonds.
They have weak bonds which require a little amount of heat energy to overcome these weak bonds.
Ionic compounds are _____.
malleable
ductile
soft
brittle
Which of the following is an example of an ionic compound?
H 2 O
CO 2
NaCl
CH 4
Which of the following is a property of ionic compounds?
They have low melting points.
They conduct electricity in solid state.
They are usually soluble in water.
They are malleable and ductile.
