Chemistry test

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time limit: t < 10 min - Developed by: Dan - The quiz is developed on: - 15045 taken - User Rating: 3.33 5.0 - 12 Votes

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  • 1
    Chemistry is the study of?
    Transformation of matter
    Matter and the transformation of matter
    Matter
    Only microscopic phenomena
  • 2
    What is the first step in the scientific process?
    Generate a scientific hypothesis
    Observe a natural phenomenon
    Develop a test
    Make a prediction about what may be happening
    Check results by repeating work
  • 3
    A scientific hypothesis is a(n) ________
    Testable assumption used to explain an observation
    Test designed to limit possible conclusions
    Prediction of what will happen in a certain situation
    Restatement of a natural phenomenon
  • 4
    Why do scientists run control experiments and repeat their tests several times?
    To minimize the number of conclusions and limit potential flaws in the experiment
    Because chemistry is about doing experiments
    To maximize the number of possible conclusions that can be obtained
    Because they get paid by the hour
  • 5
    Which of the following best describes a theory?
    A comprehensive idea that has been extensively tested
    A prediction about the outcome of an experiment
    An explanation for an observation of a natural phenomenon
    a static, unchanging law of the universe
    A new way of testing an old idea
  • 6
    Which of the following statements about science is not true?
    Science deals with observations and experimentation.
    An experiment can always be used to prove that a hypothesis is correct.
    Science deals only with testable hypotheses.
    Experiments do not always go as planned.
    Scientists believe that all natural phenomenon can be explained.
  • 7
    Which statement best describes Aristotle's belief about matter?
    Matter is composed of atoms, each with a different set of properties.
    Matter is made of small, indivisible particles.
    Matter is indestructible
    Matter is composed of four different fundamental qualities and altering the mixture results in new substances.
  • 8
    What was the main difference with early chemists such as Boyle and Lavoisier compared to the Greek philosophers?
    The chemists and the philosophers approached chemical principles in the same fashion.
    The philosophers relied solely on logic and reason, while the chemists relied on experimentation to explain observations.
    The chemists did not have the equipment to explain their observations.
    The philosophers did not have the equipment to explain their observations.
  • 9
    Which of the following statements best describes the Law of Conservation of Mass?
    The mass of all the products will be the same as the mass of all the reactants.
    The mass of an element is different from that of a compound.
    The mass of a chemical does not change.
    The weight of a compound conserves its mass.
  • 10
    If you heat 50 grams of wood in the absence of air and produce 10 g of ash, what is the total mass of the products?
    10g
    40g
    25g
    50g
  • 11
    You place a piece of shiny aluminum that weighs exactly 1 gram into a container and seal it. The weight of the container and its contents is exactly 10 g. You allow it to sit for a week and then reweigh the container. After one week the weight of the container and its contents is still 10 g. The mass of the sample inside is now 1.5 g. What is the best explanation for this observation?
    The aluminum reacted with some of the air inside the sealed container because the overall mass did not change.
    The container had a leak because aluminum's mass increased.
    The mass of the aluminum atoms has increased.
    The mass has not really changed because it cannot change due to the Law of Conservation of Mass.
  • 12
    Which of the following statements best summarizes the Law of Definite Proportions?
    The mass ratio is proportional to the size of the sample.
    The mass ratio of the elements in a compound will be the same regardless of how the compound was made.
    The ratio of proportions for a given element is the same.
    The mass ratio of any two elements in a compound will always be one to one.
    The mass of one element will be proportional to the mass of another element in a compound.
  • 13
    Which of the following oxygen: hydrogen mass ratios is the same as the mass ratio found in water (8 g oxygen for every 1 g hydrogen)?
    4 g oxygen for every 4 g hydrogen
    8 lb oxygen for every 1 g hydrogen
    32 g oxygen for every 4 g hydrogen
    1 lb oxygen for every 4 lb hydrogen
  • 14
    If the mass ratio of lead sulfide (PbS) is 86.6 g of lead (Pb) to 13.4 g of sulfur (S), how much sulfur is needed to completely react 15 g of lead?
    15 g of sulfur
    96.9 g of sulfur
    2.3 g of sulfur
    100 g of sulfur
    13.4 g of sulfur
  • 15
    The mass ratio of lead sulfide (PbS) is 86.6 g Pb to 13.4 g S. How much product is formed when you react 86.6 g of Pb with 86.6 g of S to form PbS?
    113.4 g of PbS
    100 g of PbS
    173.2 g of PbS
    96.9 g of PbS
  • 16
    Which of the following early chemists initially proposed the concept of an element being composed of a single component?
    Lavoisier
    Priestley
    Cavendish
    Boyle
    Proust
  • 17
    Which of the following early chemists initially stated and studied the Law of Conservation of Mass?
    Boyle
    Priestley
    Proust
    Cavendish
    Lavoisier
  • 18
    Which of the following statements from Dalton's atomic theory would best describe the following observation:
    Nine grams of water always contains 8 grams of oxygen and 1 gram of hydrogen?
    Each element consists of minute particles called atoms.
    Atoms can be neither created nor destroyed in a chemical reaction.
    Atoms combine chemically in definite whole number ratios to form compounds.
    All atoms of a given element are identical.
  • 19
    Which of the following statements from Dalton's atomic theory would best describe the following observation:
    One liter of oxygen gas weighs 32 grams while one liter of hydrogen gas weighs 2 grams?
    Atoms can be neither created nor destroyed in a chemical reaction.
    All atoms of a given element are identical.
    Each element consists of minute particles called atoms.
    Atoms of different elements have different masses.
    Atoms combine chemically in definite whole number ratios to form compounds.
  • 20
    Which of the following elements is not a diatomic molecule in its natural state?
    Phosphorus
    Nitrogen
    chlorine
    Oxygen
    Hydrogen
  • 21
    Which of the following volumes of N2 react with three liters of H2 to form two liters of NH3?
    3 liters
    1 liter
    .5 liter
    2 liters
  • 22
    Which of the following scientists would be considered the father of the modern periodic table?
    Dalton
    Guy-Lussac
    Avogadro
    Mendeleev
  • 23
    What was the main advantage of arranging the periodic table so that the elements were grouped by chemical properties?
    It meant that the properties of new elements need not be explored.
    It allows for the prediction of properties of undiscovered elements and helped lead to discoveries about the electron.
    It allowed for a simple arrangement of the elements so that each chemical property would be known and easily classified.
    It made it easier to learn the names of the elements.
  • 24
    Arrange the following chemical discoveries in chronological order (starting with earliest).
    1. Elements are made of atoms.
    2. Chemicals react in definite whole-number ratios.
    3. Relative masses of atoms can be measured.
    4. The periodic table can be used to predict the properties of the elements.
    5. Mass is conserved in a chemical reaction.
    4, 5, 3, 1
    2, 1, 3, 4, 5
    5, 2, 1, 3, 4
    5, 3, 1, 4