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WorksheetsAtoms, Elements, and Compounds
Total questions: 36
Worksheet time: 1hrs 12mins
Which atomic particle is represented by the letter a?
proton
neutron
electron
Which atomic particle is represented by the letter b?
proton
neutron
electron
Which atomic particle is represented by the letter c?
proton
neutron
electron
Which of these is not one of the most common elements in the Earth's oceans?
oxygen
chlorine
hydrogen
nitrogen
Which of the following substances cannot be broken down by other substances?
salt
water
carbon dioxide
oxygen
How many different elements are in the compound NaOH?
1
2
3
4
Which of these is not one of the most common elements in Earth's crust?
oxygen
lithium
silicon
iron
on the periodic table, the number of protons plus the number of neutrons is expressed by the ___.
electric charge
nuclear number
atomic number
atomic mass
What makes an atom of one element different from one atom of another element?
each element has a unique atomic mass
each element has a different number of nuclei
each element has a different number of neutrons
each element has a different number of protons
Which of these is the most common element in Earth's atmosphere?
oxygen
nitrogen
hydrogen
carbon dioxide
What does each black dot in this image represent?
a nucleus
an electron
a neutron
a proton
What information on the periodic table indicates the number of protons in an atom?
the position of the elements in its column
the element's chemical symbol
the element's atomic number
the element's atomic mass
Which of the following is an example of a chemical change?
pennies changing color from exposure to air
an ice cube melting in a glass
dissolving sugar in water to make Kool aid
mixing sand and soil
Which of the following is an example of a physical change?
an apple rotting on a tree
burning sugar on a stove
an ice cube melting in a glass
a bicycle rusting
Which of these statements best explains why the element sodium is different from all other elements?
it has a different electric charge
is is found in living things
it has a unique number of neutrons
it has a unique number of proton
How many protons are in an atom of Lithium?
2
3
6
7
All of the following represent a physical change EXCEPT __
your stomach breaking down the food you eat
sharpening a pencil
water evaporating from a pond
adding drops of food coloring to water
Atoms are made up of all these except __.
molecules
electrons
protons
neutrons
Two or more different atoms that are bonded together form a particle called a ____.
element
compound
molecule
solution
How many total atoms are in a molecule of glucose?
6
12
20
24
Which of the following is a balanced equation?
H2O → H2O + O2
2Fe2O3 + 3C → 4Fe + 3CO2
SO2 + O2 + 2H2O ---> 4H2SO4
2Mg + HCL ---> MgCl2 + H2
What does it mean when there is a physical change?
Matter has changed from one substance into another.
A new substance has been formed.
Matter has changed on the molecular level.
Matter has only changed size, shape, or form.
A chemical equation represents a __.
chemical reaction
physical change
element
molecule
Which of the following shows an atom of a different element from the other 3?
Which of the following is not one of the most common elements in Earth's crust?
iron
carbon
gold
magnesium
Which of the following elements is not common in living things?
hydrogen
oxygen
nitrogen
helium
carbon
Elements on the periodic table are represented by __.
chemical symbols
chemical bonds
chemical formulas
chemical reactions
How many total atoms are represented by this chemical formula?
2
3
4
5
Which of these is the correct chemical symbol for gold?
AU
au
Au
Go
Which of the following statements is incorrect?
Symbols may be one, two or three letters in length.
Symbols are always the first two letters of the element's name.
The first letter of a symbol is always capitalized.
All letters after the first letter are NOT capitalized
Why isn't water found on the periodic table?
water is a liquid at room temperature
water is a compound
water has no protons
water is not made up of elements
Which substance is an example of a compound?
nitrogen
carbon dioxide
saltwater
gold
When two or more atoms bond together, the groups of atoms are called __.
molecules
subscripts
chemical bonds
mixtures
What does the "2" in CO2 indicate?
two atoms of oxygen
two molecules of carbon monoxide
two atoms of carbon
two atoms of cobalt
Compounds are represented by __.
chemical equations
chemical formulas
chemical letters
chemical symbols
Which of the following best describes the chemical equation?
Balanced - Both sides have 6 atoms of hydrogen and 2 atoms of nitrogen
Balanced - Both sides have 3 atoms of hydrogen and 2 atoms of nitrogen
Unbalanced - The left side has 5 hydrogen but the right side has 3 hydrogen
Unbalanced - The left side has 6 hydrogen but the right side has 3 hydrogen
