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WorksheetsBasic Chemistry
Total questions: 35
Worksheet time: 21mins
In the periodic table of elements, the periods are shown
horizontally
vertically
diagonally
upside down
A chemical compound is
a substance formed by the chemical bonding of two or more different elements
a substance formed by the chemical bonding of two or more atoms
oxygen gas, O2
usually has identical physical and chemical properties to those elements from which it is formed.
Some molecules are compounds, but not ALL molecules are compounds.
True
False
H2O
is a compound but not a molecule
is only a molecule and not a compound
is a compound and also a molecule
is neither a compound or molecule
O2 Gas
is a compound
is not a molecule
is a solid
is an example of a molecule, but not a compound
A covalent bond forms
when one or more electrons are transferred from one atom to another.
when electrons are shared between atoms.
When is an ionic bond formed?
when electrons are shared
when protons are shared
when oppositely charged atoms gain or lose electrons
when oppositely charged atoms gain or lose protons
The bond holding the two carbon atoms together is
an ionic bond
a single covalent bond
a double covalent bond
a hydrogen bond
What two sub-atomic particles are found in the nucleus of an atom?
Neutrons and Protons
Shells and Electrons
Electrons and Protons
Electrons and Neutrons
Which is NOT one of the top five elements that makes up most living organisms
An atom becomes a positive ion when it
gains electrons
gains protons
loses electrons
loses electrons or gains protons
A cation is an ion with a positive charge.
true
false
Which subatomic part of an atom gives it a positive charge?
Neutron
Proton
Electron
Nucleus
What is the smallest 'building block' of the elements that make up the universe?
An atom
An electron
A proton
A cell
An atom of carbon has 6 protons and 7 neutrons in its nucleus. If the atom is neutral, how many electrons does it have?
0
7
6
13
A certain atom of oxygen contains 8 protons, 8 neutrons, & 8 electrons. Another atom of unknown identity contains 9 protons. Which of the following MUST be true about this unidentified atom?
It has 9 neutrons in its nucleus.
It is an isotope of oxygen.
Its atomic mass is a decimal number.
It cannot be an atom of oxygen.
An atom of neon has 8 valence electrons. What will an atom of neon MOST likely do to be stable?
Gain 1 electron
Lose 2 electrons
Lose 8 electrons
Neither gain nor lose any valence electrons
What type of bond is formed when atoms share electrons?
Covalent
Ionic
Hydrogen
Polyatomic
How are ionic and covalent bonds alike?
They both form organic molecules.
They both fill outer electron shells.
They both transfer electrons from one atom to another.
They both transfer protons from one atom to another.
A substance with a pH of 8 is a
acid
base
neutral
Carbon has 4 valence electrons which means
it can only form bonds with carbon
it is stable
it can make ionic bonds
it wants to make 4 covalent bonds
The electrons in the outermost energy level are called
valence
ions
covalent
farthest out
This reaction is showing energy being _____________
Absorbed
Released
There is no change in energy shown
Activation energy is
The energy to start a car
The energy needed to break down CO2
The energy needed to start a reaction
The energy used to digest food
Acids have more ______ ions than bases
OH-
H-
OH+
H+
If salt is dissolved in water, water is the ____________
Solution
Solute
Solvent
Suspension
An example of a carbohydrate would be
meat
milk
eggs
bread
Which of the following would be considered most acidic?
1
3
7
13
The image shows the periodic grid for SODIUM. What is Sodium's atomic mass?
11
12
23
Impossible to tell
What element will have the most similar physical and chemical properties to the element Sulfur (S)?
(click on the periodic table to expand it!)
Carbon (C)
Phosphorous (P)
Oxygen (O)
Neon (Ne
A substance that changes the rate of a chemical reaction without being used up in the reaction is called a ________________.
bond
catalyst
acid
ion
