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WorksheetsChanges of Matter and Atomic Structure
Total questions: 18
Worksheet time: 1hrs 9mins
What does the 14 in Carbon-14 represent?
# of electrons
# of protons
atomic mass
mass number
Which best represents the number of protons in a particular element?
atomic mass
mass number
atomic number
atomic weight
Sodium has the atomic number 11. It's mass number is 24. How many protons, electrons, and neutrons does the element have?
12 protons, 11 neutrons, 12 electrons
11 protons, no neutrons, 11 electrons
11 protons, 13 neutrons, 11 electrons
11 protons, 12 neutrons, 11 electrons
What equation would you use to find the # of neutrons?
neutrons = mass + protons
neutrons = protons + electrons
neutrons = mass - protons
neutrons = mass - atomic weight
Which of these best describes the atomic number?
22.33
22
22+
22-
Which atoms the greatest mass?
an atom with 9 protons, 10 neutrons, 9 electrons
an atom with 8 protons, 8 neutrons, 8 electrons
an atom with 9 protons, 11 neutrons, 9 electrons
Most of the mass of the atom is located ...
in the nucleus
surrounding the nucleus
Physical properties can be observed without changing the chemical makeup of the substance.
True
False
Which are chemical properties (select all that apply)
reactivity
toxicity
flammability
corrosion
Boiling point, melting point, smashing, folding, measuring, freezing point are ALL examples of physical properties
True
False
Identify the indicators/evidences of a chemical change (select all that apply)
production of light
production of gas
production of solid
production of heat
During a chemical reaction, like the vinegar + baking soda you noticed the substance starts to bubble. Which is likely the cause of it.
production of light
production of heat
production of gas
production of solid
What is the best evidence that a chemical change has taken place?
the liquid turns to a gas
the temperature changes
different chemical substance forms
sound is heard
The number of protons is equal to the number of protons (when neutral)
True
False
What are examples of physical changes? (check all that apply)
boiling
cutting
rusting
rotting
crushing
How do you find the mass number of this element?
it's the same as the atomic mass
round the atomic mass to a whole number
it's the atomic number
The number after the dash is the mass number as seen in here
Ex. Nitrogen - 14
True
False
The atomic number is equal to
atomic mass
protons
neutrons
electrons
