WorksheetsChemistry Final Review
Total questions: 30
Worksheet time: 30mins
How do ions combine to create electrically neutral compounds? (DoK Level 2)
By balancing the total positive and negative charges
By sharing all their electrons
By splitting into smaller ions
By losing all their protons
Which of the following is NOT a correct step in drawing Lewis structures?
Count total valence electrons
Create bonding framework
Distribute protons among atoms
Distribute remaining electrons
Which of the following is a common covalent molecule?
Sodium Chloride (NaCl)
Water (H₂O)
Calcium Carbonate (CaCO₃)
Potassium Iodide (KI)
Why is understanding periodic trends important in chemistry?
It helps predict the melting point of elements
It helps predict bonding behavior
It helps determine the color of compounds
It helps calculate atomic mass
Sometimes the bonds within a molecule are polar, but the molecule itself is non-polar. What property of the molecule allows this to happen?
The molecule has a symmetrical shape
The molecule contains only one type of atom
The molecule is always ionic
The molecule has a high electronegativity difference
How can you determine if a molecule is nonpolar?
Check if the molecule is equal on all sides and has a symmetrical shape
Check if the molecule contains only metals
Check if the molecule has a high electronegativity difference
Check if the molecule is a gas at room temperature
Which of the following best describes a polar molecule?
The molecule is not equal on all sides and has an asymmetrical shape
The molecule is equal on all sides and has a symmetrical shape
The molecule contains only nonmetals
The molecule has no bonds
Which of the following best describes a polar molecule?
A molecule with equal sharing of electrons between atoms
A molecule with unequal sharing of electrons between atoms
A molecule with no electrons
A molecule with only one type of atom
What is the main difference between a polar and a non-polar molecule?
Polar molecules have equal sharing of electrons, non-polar have unequal sharing
Polar molecules have unequal sharing of electrons, non-polar have equal sharing
Both have equal sharing of electrons
Both have unequal sharing of electrons
Which of the following molecules is non-polar due to its symmetry?
HCl
Chloroborane (BH2Cl)
Borane (BH3)
H2O
What makes a molecule polar according to the information provided?
The presence of unshared pairs of electrons on the central atom
The molecule being symmetrical
The molecule having only single bonds
The molecule having no central atom
Which of the following is true about the electronegativity (EN) difference for a polar bond?
EN difference is between 0.21 and 1.99
EN difference is greater than or equal to 2.00
EN difference is less than or equal to 0.20
EN difference is exactly 0
How does the molecular shape affect whether a molecule is polar or non-polar?
Polar molecules are asymmetrical or have unshared electrons, while non-polar molecules are symmetrical or have a central atom.
Polar molecules are always symmetrical.
Non-polar molecules always have unshared electrons.
Molecular shape does not affect polarity.
A student is given a molecule with a central atom that has no unshared pairs of electrons and is symmetrical. What can the student conclude about the molecule’s polarity?
The molecule is non-polar.
The molecule is polar.
The molecule is ionic.
The molecule is metallic.
If you have 3 moles of carbon dioxide (CO₂), what is the mass in grams? (Molar mass of CO₂ = 44.01 g/mol)
132.03 grams
44.01 grams
88.02 grams
3 grams
Why is it important to understand how to calculate moles?
It helps in accurately measuring substances for chemical reactions and real-world applications.
It is only useful for memorizing numbers.
It is not important in any scientific field.
It is only used in cooking recipes.
Which step is necessary to solve for the number of moles in a given mass of a substance?
Divide the mass in grams by the molar mass
Multiply the mass in grams by the molar mass
Add the mass in grams to the molar mass
Subtract the molar mass from the mass in grams
What is a mole in chemistry primarily used for?
Measuring large quantities of particles
Determining the color of substances
Measuring temperature changes
Calculating reaction speed
What is the arrangement of electrons in an atom called?
Atomic mass
Electron configuration
Isotopic structure
Proton arrangement
What are energy levels in an atom also called?
Shells
Bonds
Orbitals
Ions
What happens to the energy of a sublevel as it gets farther from the nucleus?
It decreases
It stays the same
It increases
It becomes zero
What are orbitals best described as?
Fixed paths
Clouds of probability
Solid spheres
Magnetic fields
Why are there more dots near the center of an orbital cloud diagram?
Electrons are always at the edge
Electrons are most likely to be near the nucleus
Protons repel electrons to the center
The nucleus is negatively charged
Based on the diagram, which orbital type is spherical in shape?
s orbital
p orbital
d orbital
f orbital
How many electrons can each individual box (orbital) hold according to the diagram?
1
2
4
8
What does the provided periodic table diagram help students determine?
The atomic mass of elements
The order of filling electron orbitals
The number of protons in each element
The melting points of elements
Which element has the following electron configuration: [Xe]6s²?
Barium
Calcium
Strontium
Magnesium
How many valence electrons does oxygen have, based on its electron configuration 1s² 2s² 2p⁴?
2
4
6
8
Which element in Period Two has a complete set of valence electrons according to the table?
Lithium
Oxygen
Neon
Boron
Which electrons are most important in determining the chemical properties of an atom?
Electrons in the innermost shell
Electrons in the nucleus
Electrons in the outermost shell (valence electrons)
Protons in the nucleus
