WorksheetsUnit 3 Test Review
Total questions: 35
Worksheet time: 33mins
What are the 5 Postulates of Dalton’s Atomic Theory? Draw Dalton’s Model of the Atom. a. All matter is made up of _ (a) _.
b. Atoms of an element are _ (b) .
c. Atoms are (c)
. d. To form compounds, elements combine in (d) - Law of Definite Proportions.
e. In chemical reactions, atoms are (e) ____.
Who discovered the electron and with what experiment?
Albert Einstein with the Photoelectric Effect
Niels Bohr with the Bohr Model
J.J. Thomson with the Cathode Ray Tube Experiment
Ernest Rutherford with the Gold Foil Experiment
Which model of the atom is represented by a sphere of positive charge with electrons embedded in it?
Rutherford's Model
Bohr's Model
Thomson's Model
Quantum Mechanical Model
What is the name of Thomson’s model?
Plum Pudding Model
Rutherford Model
Bohr Model
Quantum Model
Which of Dalton’s postulates did the discovery conflict with?
Atoms are indivisible and indestructible.
Atoms of a given element are identical in mass and properties.
Compounds are formed by a combination of two or more different kinds of atoms.
A chemical reaction is a rearrangement of atoms.
The Rutherford Gold Foil Experiment demonstrated that the atom has a small, dense nucleus. Which of the following observations led to this conclusion?
Most alpha particles passed through the foil without deflection.
Some alpha particles were deflected at large angles.
Alpha particles were absorbed by the foil.
Alpha particles emitted light when passing through the foil.
Rutherford discovered that atoms contain a ____________________ & are mostly empty ________________.
nucleus and space
core and void
center and gap
hub and vacuum
Which model of the atom includes a nucleus with electrons orbiting around it?
Bohr's model
Rutherford's model
Thomson's model
Dalton's model
The subatomic particles were all discovered and their mass and charge were determined.
a. The mass of a proton is 1 with a charge of (a) and it is located in the (b) of an atom.
b. The mass of an electron is 0 with a charge of (c) and it is located in the (d) c. The mass of a neutron is 1 with a charge of (e) and it is located in the nucleus of an atom.
What is the same about the following elements? Different?
same protons, different neutrons
same electrons, different protons
same neutrons, different electrons
same atomic number, different atomic mass
What is the definition of atomic mass of an element?
Total number of protons and neutrons in the nucleus of an atom.
The number of protons in the nucleus of an atom.
The volume occupied by one mole of an element.
The energy required to remove an electron from an atom.
Recall the memory device APE MAN. What does it stand for?
Atomic number = Protons = Electrons, Mass number = Atomic number + Neutrons
Atomic number = Electrons = Neutrons, Mass number = Protons + Electrons
Atomic number = Neutrons = Protons, Mass number = Electrons + Neutrons
Atomic number = Protons = Neutrons, Mass number = Electrons + Protons
How many protons, neutrons, and electrons are in Californium-234? P⁺ = ______, e⁻ = ______, n⁰ = ______
98, 98, 136
96, 96, 138
100, 100, 134
97, 97, 137
What law states that the mass of the reactants must be EQUAL to the mass of the products in a chemical reaction?
Law of Conservation of Mass
Law of Definite Proportions
Law of Multiple Proportions
Avogadro's Law
What is the molar mass of KCl?
75.44 g/mol
72.32 g/mol
74.55 g/mol
65.45 g/mol
How many protons are in Rhodium-103?
(a)
How many neutrons are in an atom of Rhodium-103?
(a)
What is the molar mass for KBr?
(a)
How much sodium is in 0.887 moles of sodium?
(a)
How many moles of potassium are in 33.1 grams of potassium?
(a)
Rhenium has two naturally occurring isotopes, Rhenium-185 and Rhenium-187. If the percent abundance of Rhenium-187 is 62.60%, what should the average atomic mass of Rhenium be? (Hint: Subtract the % from 100% to determine the percent for the second isotope.)
(a)
An atom's identity is determined by the number of (a) it contains which is called the (b) . The mass number is equal to the number of protons and (c) which both have masses of (d) and reside in the (e) .
Click on the mass number.
Click on the mass number.
Uranium-238:
protons: (a)
electrons: (b)
neutrons: (c)
Which is the correct formula for average atomic mass?
=(atomic number isotope 1)(% isotope 1) + (atomic number isotope 2)(% isotope 2)...
=(mass isotope 1)(mass number isotope 1) + (mass isotope 2)(mass number isotope 2)...
= (mass isotope 1)(% isotope 1) + (mass isotope 2)(% isotope 2)...
Rn-222
protons: (a)
electrons: (b)
neutrons: (c)
Sodium
protons: (a)
electrons: (b)
neutrons: (c)
An isotope is an atom of an (a) with the same number of (b) but different numbers of (c)
Label the following atom.
Label the following image.
Match the following subatomic particles with their charge, location, and mass.
Proton
Positive Charge
In nucleus
Mass of 1
Neutron
No Charge
In nucleus
Mass of 1
Electron
Negative Charge
Outside nucleus
Mass of 0
John Dalton stated:
elements are made of atoms
atoms of a given element are identical
atoms cannot be subdivided, created, nor destroyed
all of the above
What is the mass in grams of 3.50 mol of the element copper, Cu?
(a)
How many moles of calcium, Ca, are in 5.00 g of calcium?
(a)
