WorksheetsCounting Atoms and Molecules
Total questions: 33
Worksheet time: 17mins
H2SO4
How many different elements are present in H2COCH2
5
4
3
2
The ______ are numbers found on the lower right-hand side of an element symbol.
Coefficient
Exponent
Multiplier
Subscript
Coefficients in chemical formulas...
Multiply just the first atom
Add to the subscripts at the end of the molecule
Multiply elements without subscripts
Multiply EVERYTHING!
4CF2Cl2
C = 4, F = 4, Cl = 2
C = 1, F = 8, Cl = 8
C = 4, F = 8, Cl = 8
C = 1, F = 4, Cl = 8
C3H5(NO3)3
C = 3, H = 5, N = 3, O = 9
C = 3, H = 5, N = 1, O = 9
C = 9, H = 15, N = 3, O = 9
C = 9, H = 15, N = 1, O = 3
H2SO4
H = 2, S = 4, O = 4
H = 2, S = 1, O = 4
H = 8, S = 4, O = 4
H = 2, SO = 4
How many different elements are present in this molecule?
3 NH4C2H3O2
15
36
5
4
A ______ is a number written in front of a chemical formula.
Coefficient
Subscript
Exponent
Coordinator
The smallest piece of an element:
quark
electron
shell
atom
The cloud-like space that electrons travel around:
nucleus
shell
neutrons
Oort cloud
Protons and neutrons are found in the center of the atom called the:
nucleus
neutron
shell
cell
The subatomic particles are called:
protons, nucleus and electrons
protons, electrons and neutrons
protons, positives and negatives
cloud, shell and quarks
Electrons have a _____ charge.
neutral
negative
positive
both positive and negative
What is the sum of an atom's protons and neutrons called?
atom
atomic theory
atomic mass
atomic number
The _____ is based on the number of protons in the nucleus of the atom.
atomic structure
periodic table of the elements
atomic number
atomic mass
What subatomic particle is represented by this symbol (+):
neutron
proton
electron
What subatomic particle is represented by this charge (-):
neutron
proton
electron
The chemical formula is C4H10. How many hydrogen atoms are in one molecule of this?
1
4
10
There are three carbon atoms in one formula unit of K2CO3.
true
false
Mg(NO3)2 has five oxygen atoms per formula unit.
true
false
How many molecules are represented by 2C6H12O6 ?
(a)
How many atoms are in one molecule of C12H22O11 ?
(a)
How many atoms/ions are in one formula unit of Zn(C2H3O2)2 ?
(a)
How many carbon atoms are in 3 CH3CH3CH2CH2CH2CH3 ?
(a)
