
Unit 1 Review I - Atomic Structure and Properties

Quiz
•
Chemistry
•
12th Grade
•
Hard
Nicole Midani
FREE Resource
15 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the definition of a mole in chemistry?
The mass of one particle of a substance in grams
The number of particles in one mole of a substance
The ratio of masses in a compound
The energy required to remove one electron from an atom
Answer explanation
In chemistry, a mole refers to the number of particles in one mole of a substance. It's a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles. This option correctly defines a mole in the context of chemistry.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose of mass spectroscopy in chemistry?
To determine the percentage of different isotopes in an element
To measure the mass of one mole of a substance
To calculate the average atomic mass of an element
To determine the composition of a mixture
Answer explanation
Mass spectroscopy in chemistry is primarily used to determine the percentage of different isotopes in an element. It does this by measuring the mass-to-charge ratio of ions. The results can be used to find the relative isotopic abundance, atomic and molecular mass, and the structure of a molecule. The other options, while related to mass and chemistry, are not the primary purpose of mass spectroscopy.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the law of definite proportions?
The ratio of masses in a compound must always be the same
The ratio of protons to neutrons in an atom must always be the same
The ratio of electrons to protons in an atom must always be the same
The ratio of valence electrons to core electrons in an atom must always be the same
Answer explanation
The law of definite proportions, also known as Proust's law, states that a chemical compound always contains exactly the same proportion of elements by mass. This means that the ratio of masses in a compound must always be the same, which is the correct answer to the question. The other options, involving ratios of protons, neutrons, and electrons, are not related to this law.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the difference between an empirical formula and a molecular formula?
An empirical formula shows the lowest whole number ratio of atoms in a compound, while a molecular formula shows the actual number of atoms
An empirical formula shows the actual number of atoms in a compound, while a molecular formula shows the lowest whole number ratio
An empirical formula is used for ionic compounds, while a molecular formula is used for covalent compounds
An empirical formula is used for organic compounds, while a molecular formula is used for inorganic compounds
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose of elemental analysis in chemistry?
To determine the composition of a mixture
To calculate the percent yield of a reaction
To measure the mass of different elements in a sample
To determine the purity of a substance
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What are valence electrons?
Electrons in the outermost energy level of an atom
Electrons in the innermost energy level of an atom
Electrons in the d subshell of an atom
Electrons in the f subshell of an atom
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the electron configuration of Copper?
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰
1s²2s²2p⁶3s²3p⁶4s²3d⁹
1s²2s²2p⁶3s²3p⁶4s¹⁰3d⁰
1s²2s²2p⁶3s²3p⁶4s²3d⁸
Answer explanation
The electron configuration of Copper is 1s²2s²2p⁶3s²3p⁶4s²3d⁹. This configuration is unique because Copper is one of the few elements that doesn't follow the Aufbau principle exactly. It has a completely filled 3d orbital (10 electrons) and one less in the 4s orbital, making the correct configuration 1s²2s²2p⁶3s²3p⁶4s²3d⁹.
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