Q2 Bell Work Test

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Test over quarter 2 bell work starting 10/21 through 12/8


Questions and Answers
  • 1. 

    The principle quantum # (n) is the number of the energy level and tells us the ______ of the electron cloud

    • A.

      Shape

    • B.

      Size

    • C.

      Orientation

    Correct Answer
    B. Size
    Explanation
    The principle quantum number (n) represents the energy level of an electron in an atom. It determines the size of the electron cloud, with higher values of n indicating larger orbitals and electron clouds. Therefore, the correct answer is size.

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  • 2. 

    Which one correctly represents the 4 quantum #s for mercury (Hg)?

    • A.

      4,1,1,-1/2

    • B.

      4, 3, -3, 1/2

    • C.

      5, 2, 2, -1/2

    Correct Answer
    C. 5, 2, 2, -1/2
    Explanation
    The correct answer is 5, 2, 2, -1/2. The four quantum numbers represent different properties of an electron in an atom. The first quantum number (n) represents the energy level or shell of the electron, and in this case, it is 5. The second quantum number (l) represents the angular momentum or shape of the orbital, and it is 2 in this case. The third quantum number (ml) represents the orientation of the orbital, and it is also 2 in this case. The fourth quantum number (ms) represents the spin of the electron, and it is -1/2 in this case.

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  • 3. 

    The outer most electrons in an atom are called

    • A.

      Valence

    • B.

      Octet

    • C.

      Quantum

    Correct Answer
    A. Valence
    Explanation
    The outermost electrons in an atom are called valence electrons. These electrons are involved in chemical bonding and determine the reactivity and chemical properties of the atom. Valence electrons are located in the outermost energy level or shell of an atom and can be gained, lost, or shared during chemical reactions. The term "valence" refers to the combining capacity of an atom, which is determined by the number of valence electrons it possesses.

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  • 4. 

    The idea that no 2 electrons can have the same set of quantum #s is called

    • A.

      Graham's law

    • B.

      Pauli's exclusion principle

    • C.

      Heisenburg's Uncertainty Principle

    Correct Answer
    B. Pauli's exclusion principle
    Explanation
    Pauli's exclusion principle states that no two electrons in an atom can have the same set of quantum numbers. This principle is a fundamental concept in quantum mechanics and helps explain the arrangement of electrons in an atom's energy levels and sublevels. It also accounts for the stability of matter and the periodic table.

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  • 5. 

    Who stated that matter is made up of waves and particles?

    • A.

      Einstein

    • B.

      De Broglie

    • C.

      Dalton

    Correct Answer
    B. De Broglie
    Explanation
    De Broglie stated that matter is made up of waves and particles. This concept is known as wave-particle duality, which suggests that particles, such as electrons and protons, can exhibit both wave-like and particle-like properties. De Broglie's proposal was based on the observation that particles, like light waves, can diffract and interfere with each other. This concept revolutionized the field of quantum mechanics and laid the foundation for understanding the behavior of subatomic particles. Einstein, on the other hand, made significant contributions to the theory of relativity but did not propose the wave-particle duality concept. Dalton, on the other hand, developed the atomic theory, which describes atoms as indivisible particles.

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  • 6. 

    The ejection of electrons by metals when light shines on them is called

    • A.

      The photoelectric effect

    • B.

      The cathode ray tube experiment

    • C.

      The gold foil experiment

    Correct Answer
    A. The pHotoelectric effect
    Explanation
    The ejection of electrons by metals when light shines on them is known as the photoelectric effect. This phenomenon occurs when photons of light transfer their energy to electrons in the metal, causing them to be emitted. This effect was first observed and explained by Albert Einstein, who proposed that light behaves as both particles (photons) and waves. The photoelectric effect is significant in various applications, such as solar cells and photodiodes.

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  • 7. 

    What is a bundle of light energy?

    • A.

      Quantum

    • B.

      Photon

    • C.

      Quark

    Correct Answer
    B. pHoton
    Explanation
    A bundle of light energy is referred to as a photon. Photons are elementary particles that carry electromagnetic radiation, including visible light. They have no mass and travel at the speed of light. When an atom emits or absorbs energy in the form of light, it does so in discrete packets called photons. These photons can be thought of as individual bundles or quanta of energy. Therefore, the correct answer to the question is photon.

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  • 8. 

    The quantum mechanical model of the atom___

    • A.

      Defines the exact path of an electron

    • B.

      Was proposed by Bohr

    • C.

      Involves probability of finding an electron in a certain position

    Correct Answer
    C. Involves probability of finding an electron in a certain position
    Explanation
    The quantum mechanical model of the atom involves probability of finding an electron in a certain position. This means that instead of defining the exact path of an electron, the model focuses on the likelihood of finding an electron in a particular location within an atom. This is in contrast to the classical model of the atom, which proposed that electrons orbit the nucleus in fixed paths. The quantum mechanical model, proposed by Bohr, introduced the concept of electron orbitals, which represent the regions where electrons are most likely to be found.

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  • 9. 

    What is the energy needed to remove an electron?

    • A.

      Ionization energy

    • B.

      Electronegativity

    • C.

      Atomic radius

    Correct Answer
    A. Ionization energy
    Explanation
    Ionization energy is the amount of energy required to remove an electron from an atom or ion in its gaseous state. It represents the strength of the attraction between the nucleus and the electrons in an atom. The higher the ionization energy, the more difficult it is to remove an electron, indicating a stronger attraction between the nucleus and the electrons. Therefore, ionization energy is the correct answer for the energy needed to remove an electron. Electronegativity is a measure of an atom's ability to attract electrons in a chemical bond, while atomic radius refers to the size of an atom.

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  • 10. 

    The elements with atomic #'s 58-71 are called the

    • A.

      Alkali metals

    • B.

      Halogens

    • C.

      Transition metals

    Correct Answer
    C. Transition metals
    Explanation
    The elements with atomic numbers 58-71 are called transition metals because they are located in the d-block of the periodic table. Transition metals are known for their ability to form stable complex ions and exhibit multiple oxidation states. They have characteristic properties such as high melting and boiling points, good conductivity, and the ability to form colorful compounds. These elements are essential in various industrial applications, including catalysis, electronics, and alloy production.

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  • 11. 

    Atoms will gain or lose electrons in order to

    • A.

      Form ionic bonds

    • B.

      Form covalent bonds

    • C.

      Complete an octet

    Correct Answer
    C. Complete an octet
    Explanation
    Atoms will gain or lose electrons in order to complete an octet. This means that they will either gain or lose electrons to have a full outer shell of electrons, which typically consists of eight electrons. By completing an octet, atoms achieve a stable electron configuration, similar to the noble gases, which are known for their stability. This stability is achieved by either gaining electrons to fill their outer shell or losing electrons to expose a full outer shell.

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  • 12. 

    A positive ion is called

    • A.

      Anion

    • B.

      Isotope

    • C.

      Cation

    Correct Answer
    C. Cation
    Explanation
    A positive ion is called a cation because it is formed when an atom loses one or more electrons, resulting in a net positive charge. Cations are attracted to negatively charged particles and are typically formed by metals. Anions, on the other hand, are negatively charged ions formed when an atom gains one or more electrons. Isotopes, on the other hand, are atoms of the same element that have different numbers of neutrons in their nuclei.

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  • 13. 

    Which of the following group #, valence electrons, and charge is correct?

    • A.

      Group 15, 5, 3-

    • B.

      Group 15, 5, 5+

    • C.

      Group 15, 15, 3-

    Correct Answer
    A. Group 15, 5, 3-
    Explanation
    In the periodic table, Group 15 elements have 5 valence electrons. The charge of an ion is determined by gaining or losing electrons. Since the answer states "3-", it means that the element in Group 15 has gained 3 electrons, resulting in a negative charge. Therefore, the correct answer is Group 15, 5, 3-.

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  • 14. 

    A phosphorus atom needs to gain ______ electrons to achieve a stable octet

    • A.

      5

    • B.

      3

    • C.

      15

    Correct Answer
    B. 3
    Explanation
    A phosphorus atom needs to gain 3 electrons to achieve a stable octet. This is because phosphorus has 5 valence electrons and it needs a total of 8 electrons in its outermost energy level to have a full octet, following the octet rule. By gaining 3 electrons, phosphorus will have a total of 8 electrons in its outermost energy level, making it stable.

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  • 15. 

    What is a compound made up of two elements?

    • A.

      Binary

    • B.

      Polyatomic

    • C.

      Ternary

    Correct Answer
    A. Binary
    Explanation
    A compound made up of two elements is called a binary compound. In a binary compound, there are only two different elements present. This means that the compound consists of molecules or ions composed of two different types of atoms. Examples of binary compounds include water (H2O), sodium chloride (NaCl), and carbon dioxide (CO2).

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  • 16. 

    What represents the charge on transition metals?

    • A.

      Exponents

    • B.

      Subscripts

    • C.

      Roman numerals

    Correct Answer
    C. Roman numerals
    Explanation
    Transition metals can exist in multiple oxidation states due to the presence of partially filled d orbitals. The charge on transition metals is represented by Roman numerals in parentheses after the metal's name. This is because the Roman numeral indicates the oxidation state of the metal in a compound, which helps to determine its chemical behavior and reactivity. Subscripts are used to indicate the number of atoms of each element in a compound, while exponents are used in scientific notation to represent very large or very small numbers.

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  • 17. 

    To neutralize an acid burn, the safest substance to use would be

    • A.

      Alcohol

    • B.

      Strong base

    • C.

      Baking soda

    Correct Answer
    C. Baking soda
    Explanation
    Baking soda is the safest substance to use to neutralize an acid burn because it is a weak base. When mixed with water, baking soda can help to neutralize the acidic nature of the burn, reducing pain and preventing further damage. Alcohol can actually worsen the burn and cause more pain, while a strong base may be too harsh and cause further damage to the skin. Baking soda is a gentle and effective option for neutralizing acid burns.

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  • 18. 

    The proper method for treating a hot glass burn would be

    • A.

      Cold water

    • B.

      Butter

    • C.

      Baking soda

    Correct Answer
    A. Cold water
    Explanation
    The correct answer is cold water because it helps to cool down the burn and reduce pain. Cold water constricts blood vessels, which can prevent further damage to the skin and promote faster healing. Additionally, cold water can help to remove any remaining hot glass particles from the skin. Butter and baking soda should not be used as they can trap heat and potentially worsen the burn.

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  • 19. 

    Which of the following is homogeneous?

    • A.

      Milk

    • B.

      Sugar water

    • C.

      Paper

    Correct Answer
    B. Sugar water
    Explanation
    Homogeneous refers to a substance that has a uniform composition throughout, meaning that its components are evenly distributed and cannot be visibly distinguished. Milk is not homogeneous because it contains fat globules that separate over time. Paper is also not homogeneous as it is made up of fibers that are randomly arranged. On the other hand, sugar water is homogeneous as the sugar molecules are evenly dispersed and cannot be seen separately, resulting in a uniform solution.

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  • 20. 

    Which of the following is heterogeneous?

    • A.

      Sugar

    • B.

      Air

    • C.

      Ice cream (yummy :)

    Correct Answer
    C. Ice cream (yummy :)
    Explanation
    The correct answer is ice cream because it is a mixture of different substances. Ice cream is made up of milk, cream, sugar, and various flavorings, which gives it a heterogeneous composition. In contrast, sugar is a pure substance, and air is a homogeneous mixture of different gases.

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  • 21. 

    The majority of elements are 

    • A.

      Metals

    • B.

      Nonmetals

    • C.

      Metalloids

    Correct Answer
    A. Metals
    Explanation
    The majority of elements are metals. Metals are characterized by their ability to conduct heat and electricity, their high luster, and their malleability and ductility. They are found on the left side and in the middle of the periodic table. Nonmetals, on the other hand, are poor conductors of heat and electricity and are found on the right side of the periodic table. Metalloids, also known as semimetals, have properties that are intermediate between metals and nonmetals and are found along the zigzag line on the periodic table.

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  • 22. 

    An example of a physical change would be

    • A.

      Ice melting

    • B.

      Wood burning

    • C.

      Iron rusting

    Correct Answer
    A. Ice melting
    Explanation
    physical changes are a change in phase (state) or appearance.
    Chemical changes produce a new substance

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  • 23. 

    An extensive property would be

    • A.

      Malleability

    • B.

      Solubility

    • C.

      Mass

    Correct Answer
    C. Mass
    Explanation
    extensive properties depend on the amount of a substance

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  • 24. 

    An insoluble substance that forms during a chemical reaction that might make your solution cloudy is called a(n)

    • A.

      Precipitate

    • B.

      Solute

    • C.

      Impurity

    Correct Answer
    A. Precipitate
    Explanation
    A precipitate is an insoluble substance that forms during a chemical reaction. When certain substances react, they can form solid particles that are unable to dissolve in the solution, causing it to become cloudy or appear as a solid. This can happen when two solutions are mixed together and a chemical reaction occurs, resulting in the formation of a new substance that is insoluble in the solution. Therefore, a precipitate is the correct answer as it explains the formation of an insoluble substance that can make a solution cloudy.

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  • 25. 

    The substance that you start with in a chemical reaction is called

    • A.

      Ingredients

    • B.

      Products

    • C.

      Reactants

    Correct Answer
    C. Reactants
    Explanation
    In a chemical reaction, the substances that undergo a change are called reactants. These are the starting materials that are present before the reaction takes place. Reactants are transformed into different substances, known as products, through the reaction. Therefore, reactants are the correct answer as they best describe the substances involved at the beginning of a chemical reaction.

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  • 26. 

    How many significant digits are in 3.68040 ?

    • A.

      1

    • B.

      3

    • C.

      6

    Correct Answer
    C. 6
    Explanation
    The number 3.68040 has six significant digits. All the digits in the number are non-zero, except for the zero at the end. All the non-zero digits and the zero in between them are significant, making a total of six significant digits.

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  • 27. 

    How many neutrons does aluminum (Al) have?

    • A.

      13

    • B.

      14

    • C.

      27

    Correct Answer
    B. 14
    Explanation
    Aluminum (Al) has an atomic number of 13, which indicates the number of protons in its nucleus. The atomic mass of aluminum is 27, and since atomic mass is the sum of protons and neutrons, subtracting the atomic number from the atomic mass gives the number of neutrons. Therefore, aluminum has 14 neutrons.

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  • 28. 

    What particle in the nucleus has a charge of +1 and a mass of 1 amu?

    • A.

      Electron

    • B.

      Neutron

    • C.

      Proton

    Correct Answer
    C. Proton
    Explanation
    Protons are particles found in the nucleus of an atom. They have a positive charge of +1 and a mass of approximately 1 atomic mass unit (amu). Electrons, on the other hand, have a negative charge and a significantly smaller mass compared to protons. Neutrons have no charge and a mass similar to that of protons. Therefore, the particle in the nucleus that matches the given description is a proton.

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  • 29. 

    Atoms with the same # of protons but different # of neutrons are called:

    • A.

      Isotopes

    • B.

      Acids

    • C.

      Polyatomic ions

    Correct Answer
    A. Isotopes
    Explanation
    Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. This difference in the number of neutrons results in isotopes having different atomic masses. Isotopes can have similar chemical properties due to the same number of protons, but they may differ in stability and radioactivity due to the varying number of neutrons.

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  • 30. 

    An s2p6 ending electron configuration is called a(n):

    • A.

      Quantum

    • B.

      Photon

    • C.

      Octet

    Correct Answer
    C. Octet
    Explanation
    An s2p6 ending electron configuration refers to the arrangement of electrons in the outermost energy level of an atom. In this configuration, the s sublevel is completely filled with 2 electrons, and the p sublevel is also completely filled with 6 electrons. This configuration is called an "octet" because it resembles the stable electron configuration of the noble gases in Group 18 of the periodic table, which have 8 electrons in their outermost energy level.

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  • 31. 

    An example of a Halogen is:

    • A.

      Sodium (Na)

    • B.

      Magnesium (Mg)

    • C.

      Chlorine (Cl)

    Correct Answer
    C. Chlorine (Cl)
    Explanation
    An example of a Halogen is chlorine (Cl) because halogens are a group of elements that are highly reactive and have seven valence electrons in their outermost energy level. Chlorine is a halogen because it belongs to Group 17 of the periodic table and has seven valence electrons, making it highly reactive and capable of forming compounds with other elements. Sodium (Na) and magnesium (Mg) are not halogens as they do not possess the characteristics of halogens.

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  • 32. 

    Neon (Ne) is an example of

    • A.

      An alkaline metal

    • B.

      Halogen

    • C.

      Noble gas

    Correct Answer
    C. Noble gas
    Explanation
    Neon (Ne) is classified as a noble gas. Noble gases are a group of elements that are known for their low reactivity and stable electron configurations. They are located in Group 18 of the periodic table and have a full outer electron shell, making them highly stable and unreactive. Neon specifically is commonly used in lighting due to its characteristic bright orange-red glow when electrically charged.

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  • 33. 

    As you move down a family or group on the periodic table, the electronegativity decreases because of

    • A.

      Shielding

    • B.

      Size of the atom

    • C.

      All of these

    Correct Answer
    C. All of these
    Explanation
    As you move down a family or group on the periodic table, the electronegativity decreases because of shielding and the size of the atom. Shielding occurs when inner electron shells partially block the attraction between the positively charged nucleus and the outermost electrons. This reduces the effective nuclear charge experienced by the outermost electrons, leading to a decrease in electronegativity. Additionally, as you move down a group, the size of the atom increases, which also decreases electronegativity. Therefore, all of these factors contribute to the decrease in electronegativity as you move down a family or group on the periodic table.

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  • 34. 

    The tendency of an atom to attract a shared electron when it is bonded is called:

    • A.

      Ionization energy

    • B.

      Electron affinity

    • C.

      Electronegativity

    Correct Answer
    C. Electronegativity
    Explanation
    Electronegativity refers to the tendency of an atom to attract a shared electron when it is bonded. It is a measure of the atom's ability to attract and hold onto electrons in a chemical bond. Electronegativity values are used to predict the nature of chemical bonding, such as whether a bond is ionic or covalent. A higher electronegativity value indicates a stronger attraction for electrons, while a lower value indicates a weaker attraction.

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  • 35. 

    The element with the highest electronegativity is:

    • A.

      Fluorine (F)

    • B.

      Oxygen (O)

    • C.

      Francium (Fr)

    Correct Answer
    A. Fluorine (F)
    Explanation
    Fluorine has the highest electronegativity among the given elements. Electronegativity is a measure of an atom's ability to attract electrons towards itself in a chemical bond. Fluorine is the most electronegative element because it has a small atomic radius and a high effective nuclear charge, which means it can strongly attract electrons. Oxygen has a lower electronegativity than fluorine, and francium has the lowest electronegativity among the given elements.

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  • 36. 

    What is the formula for acetic acid?

    • A.

      HCl

    • B.

      H2CO3

    • C.

      HC2H3O2

    Correct Answer
    C. HC2H3O2
    Explanation
    The formula for acetic acid is HC2H3O2. Acetic acid is a weak acid that is commonly found in vinegar. Its molecular formula indicates that it contains two carbon atoms, four hydrogen atoms, and two oxygen atoms. The presence of the acetate ion (C2H3O2-) in the formula indicates its acidic nature.

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  • 37. 

    What is the name of H2SO4?

    • A.

      Hydrogen sulfate

    • B.

      Sulfuric acid

    • C.

      Hydrosulfuric acid

    Correct Answer
    B. Sulfuric acid
    Explanation
    The correct answer is sulfuric acid. Sulfuric acid is a strong acid that is commonly used in various industries and laboratory settings. It is a colorless and odorless liquid that is highly corrosive and can cause severe burns. The name "sulfuric acid" accurately describes the composition of the compound, as it consists of sulfur and oxygen atoms bonded to hydrogen atoms. Therefore, sulfuric acid is the appropriate name for H2SO4.

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  • 38. 

    What is the formula for calcium phosphate?

    • A.

      CaPO4

    • B.

      Ca2(PO4)3

    • C.

      Ca3(PO4)2

    Correct Answer
    C. Ca3(PO4)2
    Explanation
    The correct answer is Ca3(PO4)2. Calcium phosphate is composed of one calcium ion (Ca2+) and two phosphate ions (PO43-). The formula Ca3(PO4)2 indicates that there are three calcium ions and two phosphate ions in the compound, which is the correct ratio for calcium phosphate.

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  • 39. 

    What is the name of FeCl2?

    • A.

      Iron chloride

    • B.

      Iron (II) chloride

    • C.

      Iron dichloride

    Correct Answer
    B. Iron (II) chloride
    Explanation
    The correct answer is "iron (II) chloride" because FeCl2 is a compound containing iron with a +2 oxidation state. In chemical nomenclature, the Roman numeral II is used to indicate the +2 oxidation state of iron. Therefore, "iron (II) chloride" is the appropriate name for FeCl2.

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  • 40. 

    Lavoisier proposed that matter can neither be created nor destroyed but only changed.  This is the law of:

    • A.

      Definite proportions

    • B.

      Conservation of mass

    • C.

      Multiple proportions

    Correct Answer
    B. Conservation of mass
    Explanation
    The correct answer is conservation of mass. This law states that the total mass of a closed system remains constant over time, regardless of any physical or chemical changes that may occur within the system. Lavoisier's proposal that matter cannot be created or destroyed, but only transformed, aligns with the principle of conservation of mass.

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  • 41. 

    Proust proposed that elements in a substance will always combine in the same ratio by mass.  This is the law of :

    • A.

      Definite proportions

    • B.

      Conservation of mass

    • C.

      Multiple proportions

    Correct Answer
    A. Definite proportions
    Explanation
    Proust's proposal that elements in a substance will always combine in the same ratio by mass refers to the law of definite proportions. This law states that a compound will always contain the same elements in the same proportion by mass, regardless of the sample size or source of the compound. It is a fundamental principle in chemistry that helps in understanding the composition and behavior of substances.

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  • 42. 

    Dalton noted that elements in a substance always combine in small whole # ratios.  This is the law of:

    • A.

      Definite proportions

    • B.

      Conservation of mass

    • C.

      Multiple proportions

    Correct Answer
    C. Multiple proportions
    Explanation
    Dalton's observation that elements in a substance combine in small whole number ratios is known as the law of multiple proportions. This law states that when two elements combine to form different compounds, the ratio of the masses of one element that combines with a fixed mass of the other element will always be a ratio of small whole numbers. This observation supports the idea that elements combine in specific and predictable ratios, which is a fundamental concept in chemistry.

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  • 43. 

    The idea that no two electrons can have the same set of 4 quantum #s is called

    • A.

      Pauli exclusion principle

    • B.

      Heisenburg uncertainty principle

    • C.

      Aufbau principle

    Correct Answer
    A. Pauli exclusion principle
    Explanation
    The Pauli exclusion principle states that no two electrons can have the same set of four quantum numbers. This means that in an atom, each electron must have a unique combination of values for its principal quantum number, azimuthal quantum number, magnetic quantum number, and spin quantum number. This principle helps explain the organization of electrons in atomic orbitals and the filling of electron shells.

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  • 44. 

    The explanation of an electron as having a mass, charge, frequency,and wavelength is known as:

    • A.

      Light theory

    • B.

      Wave particle theory

    • C.

      Heisenberg's theory

    Correct Answer
    B. Wave particle theory
    Explanation
    The wave particle theory explains the dual nature of electrons, stating that they can behave both as particles and waves. This theory suggests that electrons have mass, charge, frequency, and wavelength, which are characteristics of both particles and waves. It reconciles the wave-like behavior observed in interference and diffraction experiments with the particle-like behavior observed in experiments like the photoelectric effect. This theory revolutionized our understanding of the atomic and subatomic world, providing a framework to explain phenomena that classical physics couldn't account for.

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  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 10, 2010
    Quiz Created by
    Msnance
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