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WorksheetsChemistry Fall Semester Review 2024
Total questions: 71
Worksheet time: 3hrs 38mins
What is Ionization Energy?
The energy required to remove an electron from an atom in its gaseous state
The energy released when an electron is added to an atom
The energy required to break a chemical bond
The energy required to change the state of a substance
Electronegativity is defined as:
The ability of an atom to attract electrons towards itself
The energy required to remove an electron from an atom
The energy change when an electron is added to an atom
The size of an atom
What is the definition of Atomic Radius?
The distance from the nucleus to the outermost electron
The number of protons in an atom
The energy required to remove an electron
The number of neutrons in an atom
Which of the following scientists used the cathode ray tube experiment to discover the electron and proposed the plum pudding model of the atom?
Thomson
Rutherford
What does Rutherford’s Experiment demonstrate about the structure of the atom?
The atom is a solid sphere.
The atom has a dense nucleus with electrons orbiting around it.
The atom is a plum pudding model.
The atom is indivisible.
Label the following parts of the atom.
(a)
What is the relationship between wavelength and frequency? Describe the relationship using the table below.
As wavelength increases, frequency increases
As wavelength decreases, frequency decreases
What is wavelength & frequency?
What happens to frequency when wavelength increases?
Frequency increases
Frequency stays the same
Frequency isn't involved
What happens to frequency when wavelength decreases?
Frequency decreases
Frequency stays the same
Frequency is equal to the wavelength
What is the maximum amount of electrons that can fit in each orbital shape? s orbital: _______ electrons
4
6
8
What is the maximum amount of electrons that can fit in each orbital shape? p orbital: _______ electrons
4
2
8
What is the maximum amount of electrons that can fit in each orbital shape? d orbital: _______ electrons
2
8
6
What is the maximum amount of electrons that can fit in each orbital shape? f orbital: (a) electrons
Define isotope.
An isotope is a variant of a particular chemical element which differs in neutron number.
An isotope is a molecule with a different number of electrons.
An isotope is a type of chemical bond between atoms.
An isotope is a form of energy released during nuclear reactions.
The periodic table is arranged by _________________. ________________ typically increases as atomic number increases, but there are exceptions because of _________________. Use the word bank: isotope, atomic number, atomic mass.
(a)
What does the mass on the periodic table represent? How is average atomic mass calculated?
The mass represents the atomic number, and average atomic mass is calculated by adding the number of protons and neutrons.
The mass represents the atomic mass unit, and average atomic mass is calculated by taking the weighted average of all isotopes.
The mass represents the number of electrons, and average atomic mass is calculated by multiplying the atomic number by the number of isotopes.
The mass represents the number of neutrons, and average atomic mass is calculated by dividing the total mass by the number of isotopes.
What is the correctly reported average atomic mass of element X if 26.54% of the element has a mass of 64 amu and 73.46% of the element has a mass of 67 amu?
65.0 amu
66.0 amu
66.5 amu
67.0 amu
Sulfur is found as four isotopes in nature. 95.00% is sulfur-32; 0.76% is sulfur-33; 4.22% is sulfur-34 and 0.014% is sulfur-36. Calculate the average atomic mass using the weighted average method.
31.972 amu
32.065 amu
32.080 amu
32.100 amu
Titanium has five common isotopes: Ti-46 (8.0%), Ti-47 (7.8%), Ti-48 (73.4%), Ti-49 (5.5%), Ti-50 (5.3%). What is the average atomic mass of titanium?
47.88 amu
48.00 amu
48.08 amu
48.20 amu
What is the dot diagram for N?
A single dot
Two dots
Three dots
Five dots
What is the dot diagram for O?
6 dots
8 dots
4 dots
2 dots
What is the dot diagram for Be?
Be:
Be::
Be
Lewis Dot Structures represent the ______________ ______________ of an element and can be determined by the ____________ ______________.
(a)
Draw the trends of the periodic table on the periodic table below: atomic radius, electronegativity, and ionization energy.
What types of elements make up an ionic compound?
Metals and non-metals
Only metals
Only non-metals
Metals and metalloids
What types of elements make up a covalent compound?
Metals and nonmetals
Nonmetals only
Metals only
Metalloids and metals
Based on your answers to numbers 1, 2, & 3, what do you notice about ionic compounds and electronegativity? What patterns do you see?
Below is a periodic table. Label the location of each element given: Na, Cl, Ca, Br, Fe, W.
What type of compound is created with the elements in #5? Do you think the electronegativity difference is big or small?
Ionic compound with a big electronegativity difference
Covalent compound with a small electronegativity difference
Metallic compound with no electronegativity difference
Polar covalent compound with a moderate electronegativity difference
Below is a periodic table. Label the location of each element given: N, O, F, Cl, S, Br.
What do you notice about the difference in electronegativities between the elements you labeled for #7 above? Are they large differences or small differences?
Large differences
Small differences
No difference
Cannot be determined
Choose one. If elements have large electronegativity differences between them they form (ionic, covalent) compounds.
Ionic
Covalent
Choose one. If elements have small electronegativity differences between them, they form (ionic, covalent) compounds.
Ionic
Covalent
Can you use electronegativities to predict the type of bond that forms between elements? Why or why not? Give an example.
What are the rules for naming binary ionic compounds?
The cation is named first, followed by the anion with an '-ide' suffix.
The anion is named first, followed by the cation with an '-ide' suffix.
Both ions are named with their elemental names without any suffix.
The cation is named with an '-ide' suffix, followed by the anion.
What are the rules for naming ionic compounds with polyatomic ions in them?
Use the name of the cation followed by the name of the polyatomic ion.
Use the name of the polyatomic ion followed by the name of the cation.
Use the name of the cation followed by the name of the anion, without any changes.
Use the name of the anion followed by the name of the cation, without any changes.
What rule is specific to naming ionic compounds with transition metals in them?
Use Roman numerals to indicate the charge of the metal.
Use prefixes to indicate the number of atoms.
Use suffix '-ide' for the anion.
Use the metal's atomic number in the name.
What’s the difference between naming ionic and covalent compounds?
Ionic compounds use prefixes to denote the number of atoms, while covalent compounds use Roman numerals.
Ionic compounds use Roman numerals to denote the charge of the metal, while covalent compounds use prefixes to denote the number of atoms.
Ionic compounds use suffixes to denote the number of atoms, while covalent compounds use prefixes to denote the charge of the atoms.
Ionic compounds use prefixes to denote the charge of the metal, while covalent compounds use suffixes to denote the number of atoms.
How are oxidation numbers related to valence electrons?
Oxidation numbers are equal to the number of valence electrons.
Oxidation numbers are the opposite of the number of valence electrons.
Oxidation numbers indicate the gain or loss of valence electrons.
Oxidation numbers have no relation to valence electrons.
Compare the periodic table in #17 to the periodic table in #5. What do you notice? What type of compound is this? Ionic? Covalent? How do you know?
The periodic tables are identical, and the compound is ionic because it involves a metal and a non-metal.
The periodic tables are different, and the compound is covalent because it involves two non-metals.
The periodic tables are identical, and the compound is covalent because it involves two non-metals.
The periodic tables are different, and the compound is ionic because it involves a metal and a non-metal.
What do the oxidation numbers (charges) stand for?
The number of electrons lost or gained by an atom
The number of protons in an atom
The atomic mass of an element
The number of neutrons in an atom
Oxidation numbers are specific for what type of atom?
Metals
Non-metals
Ions
Noble gases
Identify the cations in the table above. Hint: not every compound will have them.
All compounds have cations
Only ionic compounds have cations
No compounds have cations
Only covalent compounds have cations
Identify the anions in the table above. Hint: not every compound will have them.
Chloride
Sulfate
Nitrate
Phosphate
What happens to an atom’s radius if the atom loses an electron?
The radius increases.
The radius decreases.
The radius remains the same.
The radius fluctuates.
What happens to an atom’s radius if the atom gains an electron?
The atom's radius increases.
The atom's radius decreases.
The atom's radius remains the same.
The atom's radius becomes zero.
Draw the Lewis Dot Structure for CO2.
For the following molecules draw the dot structure, name the shape and compound and determine the polarity.
For the following molecules draw the dot structure, name the shape and compound and determine the polarity.
For the following molecules draw the dot structure, name the shape and compound and determine the polarity.
For the following molecules draw the dot structure, name the shape and compound and determine the polarity.
Metallic bonds are described as a “sea of electrons”. What does this mean and why does it make metals malleable and good conductors?
The sea of electrons allows for easy movement of atoms, making metals malleable and conductive.
The sea of electrons creates a rigid structure, making metals brittle and poor conductors.
The sea of electrons prevents movement, making metals hard and non-conductive.
The sea of electrons causes metals to be insulators and non-malleable.
Define a mole as related to chemistry.
A unit of mass in chemistry
A unit of volume in chemistry
A unit of amount of substance in chemistry
A unit of temperature in chemistry
What are the steps to convert from grams of a substance to atoms (or formula units or particles)?
Determine the molar mass, convert grams to moles, use Avogadro's number to find atoms
Use Avogadro's number directly on grams
Convert grams to liters, then use Avogadro's number
Find the density, then use Avogadro's number
What are the necessary resources/tools needed to make the conversion from grams to atoms (formula units or particles)?
Molar mass and Avogadro's number
Density and volume
Temperature and pressure
Concentration and pH
Circle the substances that have the greater number of particles: 2.1 mols of Pb or 2.4 mols of Si
2.1 mols of Pb
2.4 mols of Si
Circle the substances that have the greater number of particles: 0.0745 mols of Na or 0.322 mols of Ne
0.0745 mols of Na
0.322 mols of Ne
Circle the substances that have the greater number of particles: 0.675 mols of Mg or 0.218 mols of Ca
0.675 mols of Mg
0.218 mols of Ca
Circle the substances that have the greater number of particles: 1.5 mols of Rb or 1.8 mols of Cs
1.5 mols of Rb
1.8 mols of Cs
Convert the following: 29.7 g of iron to moles
(a)
Convert the following: 25.0 g of silicon to moles
(a)
Convert the following: 98.0 g Pb to moles Pb
(a)
Convert the following: 41.0 g Au to moles gold
(a)
How many atoms/formula units/particles will be found in 34.5 g of silver?
1.93 x 10^23
3.01 x 10^23
6.02 x 10^23
9.03 x 10^23
Convert 2.3 g of K to atoms/formula units/particles of K.
3.54 x 10^22 atoms
4.58 x 10^23 atoms
5.78 x 10^21 atoms
6.02 x 10^23 atoms
Convert 4.58 grams of C to atoms/formula units/particles of C.
7.64 x 10^22 atoms
2.29 x 10^23 atoms
3.82 x 10^23 atoms
1.15 x 10^23 atoms
What is the formula for calculating percent composition?
(Mass of element / Total mass of compound) x 100
(Total mass of compound / Mass of element) x 100
(Mass of element + Total mass of compound) x 100
(Total mass of compound - Mass of element) x 100
What is the percent composition of lithium in LiBr?
7.98%
8.04%
8.12%
8.20%
Which of the following best defines an empirical formula?
The simplest whole-number ratio of atoms in a compound.
The actual number of atoms of each element in a molecule.
A representation of a molecule showing the arrangement of atoms.
A formula that shows the types of bonds in a compound.
Determine the empirical formula for the following molecular formulas.
(a)
Which of the following best describes the process used to determine the Empirical Formulas?
By calculating the ratio of moles of each element present in the compound.
By measuring the physical properties of the compound.
By analyzing the color of the compound.
By determining the melting point of the compound.
