Science Exam review / 7th grade: Unit 2

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Science Exam review / 7th grade: Unit 2
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2012-02-27 09:34:58
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  1. Mendeleev created the first periodic table by arranging elements in order of ___

    a decreasing atomic mass
    b increasing melting points
    c increasing atomic mass
    increasing atomic mass
  2. The smallest particle of an element is called a(n) _______

    a atom
    b compound
    c molecule
    atom
  3. A substance that cannot be broken down into other substances by chemical or physical means is called a(n) ____

    a molecule
    b atom
    c element
    element
  4. Which is true?

    a Water and carbon dioxide are elements.
    b Oxygen and copper are elements.
    c Water exists as an atom.
    Oxygen and copper are elements.
  5. Water and table salt are ________

    a atoms
    b compounds
    c elements
    compounds
  6. From an element's location in the periodic table, you can tell _____

    a its chemical name
    b when it was discovered
    c its properties
    its properties
  7. Matter can be classifed by its reactivity. If you looked at the periodic table, you would find the most reactive in ________
    a Group 1, the first column on the left
    b Period 1, the first row across
    c Periods 6 & 7 on the bottom
    Group 1, the first column on the left
  8. Helium, neon, argon, and krypton do not normally form compounds with other elements and are in the family called the ___
    a metalloids
    b noble gases
    c transition metals
    noble gases
  9. Chemists classify elements as metals based on their physical properties. Most metals are _____
    a ductile, shiny, and liquid at room temperature
    b ductile, malleable, and good conductors of heat/electricity
    c brittle, shiny, and good conductors of heat/electricity
    ductile, malleable and good conductors of heat/electricity
  10. Which is true about transition metals?

    a They are never found uncombined in nature.
    b They include metals such as gold, silver, and copper.
    c They are so soft that they can be cut with an ordinary knife.
    They include metals such as gold, silver, and copper.
  11. Which group of elements shares characteristics with both metals and nonmetals?
    a carbon family
    b noble gases
    c transition metals
    transition metals
  12. Density is the measure of how much mass is in a given volume. If aluminum has a mass of 30 grams and a volume of 10 cm3, what is its density?
    3 g/cm3
  13. If you heat a liquid and measure the temperature at which it boils, you are measuring a(n) _____
    a atomic property
    b physical property
    c chemical property
    physical property
  14. If you describe methane as a gas that easily catches fire, you are describing a ____

    a physical property
    b chemical property
    c state of matter
    chemical property
  15. Elements in the ___ are fairly stable, mostly hard and shiny, good conductors of electricity and used to make coins and jewelry.
    a carbon family
    b transition metals
    c alkali metals
    transition metals
  16. Examples of physical properties include:

    a flammabiltiy, PH, and reactivity
    b boiling point, size, and shape
    c size, state of matter, and PH
    boiling point, size, and shape
  17. Examples of chemical properties include:

    a flammability, PH, and reactivity
    b boiling point and freezing point
    c density, size, and conductivity
    flammability, PH, and reactivity
  18. Which is TRUE?

    a Water has a PH of 7. It is an acid.
    b Tomatoes have a PH of 4.2. They are neutral.
    c Face soap has a PH of 11. It is a base.
    Face soap has a PH of 11. It is a base.
  19. Lemon juice is an acid. the PH of lemon juice must be ____

    a 2
    b 7
    c 9
    2
  20. Evidence of a chemical change may include ___

    a boiling or melting
    b change in size
    c gas formation or color change
    gas formation or color change
  21. Which is a physical change?

    a gas burning on the stove
    b salt dissolving in a glass of water
    c rust forming on an iron fence
    salt dissolving in a glass of water
  22. Which is a chemical change?

    a photosynthesis
    b adding blue dye to water
    c crumbling a piece of paper
    photosynthesis
  23. Sodium and chlorine react with each other to produce sodium chloride (table salt). Compare the chemical properties of the new substance with the originals.

    a Sodium is a soft metal, chlorine is a gas, and sodium chloride is a solid.
    b Sodium is an alkali metal, chlorine is a halogen, and sodium chloride is a noble gas.
    c Sodium and chlorine are both extremely reactive, and sodium chloride is not.
    Sodium and chlorine are both extremely reactive, and sodium chloride is not.
  24. A substance has the following properties: a white powder that produces bubbles when vinegar is added. The iodine test indicates that no starch is present. What could the mystery substance be?
    a baking soda
    b flour
    c salt
    baking soda

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