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Topic: 8.5 Matter and Energy (1)

Quiz by Texas Education Agency

Grade 8
Science (2010)
Texas Essential Knowledge and Skills (TEKS)

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Measures 6 skills from
Grade 8
Science (2010)
Texas Essential Knowledge and Skills (TEKS)

8.5.C: Matter and Energy
8.5.B: Matter and Energy
8.5.A: Matter and Energy
8.5.E: Matter and Energy
8.5.D: Matter and Energy
8.5.F: Matter and Energy

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25 questions
Show answers
  • Q1
    A researcher wants to experiment with an element that reacts like phosphorus (P) but has a greater atomic mass. Which element should the researcher select for the experiment?
    Silicon (Si)
    Arsenic (As)
    Sulfur (S)
    Nitrogen (N)
    60s
    8.5.C: Matter and Energy
  • Q2
    A model of an atom is shown below. An atom of which element is represented by this model?
    Question Image
    Sodium (Na)
    Neon (Ne)
    Carbon (C)
    Boron (B)
    60s
    8.5.B: Matter and Energy
  • Q3
    Which of the following best describes an electron?
    It has a positive charge and much more mass than a neutron.
    It has a negative charge and about the same mass as a neutron.
    It has a negative charge and much less mass than a proton.
    It has no charge and about the same mass as a proton.
    60s
    8.5.A: Matter and Energy
  • Q4
    60s
    8.5.E: Matter and Energy
  • Q5
    Which information could a student determine from only the chemical formula of a protein?
    The number of atoms of each element in the protein
    The physical arrangement of atoms in the structure of the protein
    The color of the protein
    The number of molecules in each sequence that makes up a protein
    60s
    8.5.D: Matter and Energy
  • Q6
    A teacher asks a student to write the chemical equation for photosynthesis. The student’s response is shown below. The equation is not balanced correctly. Which of these is a balanced equation for photosynthesis?
    Question Image
    #texas/42f49aba-ff70-48a8-84e8-a30523320ff9/C.png
    #texas/42f49aba-ff70-48a8-84e8-a30523320ff9/D.png
    #texas/42f49aba-ff70-48a8-84e8-a30523320ff9/A.png
    #texas/42f49aba-ff70-48a8-84e8-a30523320ff9/B.png
    60s
    8.5.F: Matter and Energy
  • Q7
    When trying to identify an unknown element, a scientist determines what other elements the unknown element reacts with chemically. Which property of the unknown element determines the other elements it reacts with?
    The total number of particles in the nucleus of the unknown element
    The number of protons in the nucleus of the unknown element
    The total number of neutrons in the unknown element
    The number of valence electrons in the unknown element
    60s
    8.5.B: Matter and Energy
  • Q8
    The model of the periodic table below shows the locations of four elements. A student is asked to identify an element that is a pale-yellow brittle solid and does not conduct electricity. At which location in this periodic table would the element most likely be found?
    Question Image
    2
    3
    4
    1
    60s
    8.5.C: Matter and Energy
  • Q9
    An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the atom’s nucleus?
    30
    −25
    25
    −30
    60s
    8.5.A: Matter and Energy
  • Q10
    Users enter free text
    Type an Answer
    60s
    8.5.D: Matter and Energy
  • Q11
    During an investigation, a student combined the two clear, colorless solutions shown below. The student observed that the temperature changed from 25°C to 23°C when the solutions were combined and that a white substance rapidly formed and settled to the bottom of the container. What most likely happened to produce these results?
    Question Image
    Some of the water froze into ice crystals
    The solutions reacted chemically.
    One of the original compounds came out of solution
    Rapid evaporation of water occurred, leaving a solid.
    60s
    8.5.E: Matter and Energy
  • Q12
    Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?
    The shape of the coal changes.
    Oxygen is present.
    A new substance is produced.
    Coal is made up of more than one element.
    60s
    8.5.E: Matter and Energy
  • Q13
    The atoms of a certain element each contain 11 protons and 1 valence electron. Which statement correctly identifies this element and describes its chemical reactivity?
    The element is sodium, and it is not very reactive.
    The element is sodium, and it is highly reactive.
    The element is fluorine, and it is not very reactive.
    The element is fluorine, and it is highly reactive
    60s
    8.5.B: Matter and Energy
  • Q14
    An atom of a certain element has 36 protons, 36 electrons, and a mass number of 84. At room temperature this element is a very stable gas. How many neutrons are in this atom? Be sure to use the correct place value.
    Users enter free text
    Type an Answer
    60s
    8.5.A: Matter and Energy
  • Q15
    60s
    8.5.F: Matter and Energy

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