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Balance chemical equztions

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  • This represents the sum of the number of protons and neutrons in an atom's nucleus.
    Mass number
  • Which is a chemical change?
    Ice melting
    Water boiling
    Wood burning
    Sugar dissolving
  • What is the left part of a chemical equation called?
    Reactants
  • Is the following equation correctly balanced?
    No
  • This represents the number of protons in an atom's nucleus.
    Atomic number
  • 2
  • This particle is negatively charged and it surrounds the center of an atom.
    Electron
  • What does the Conservation of Matter say?
    Matter can be lost forever
    Matter is never created or destroyed
    Matter changes into energy only
    Matter can disappear if heated
  • What is the number before a chemical formula called?
    Coefficient
  • This uses the symbol for an element and dots representing the number of electrons in the element's outer energy level.
    Electron dot diagram
  • What happens to the total mass of wood after it burns, if you could collect all gases and ash?
    It would weigh less
    It would weigh more
    It would weigh the same as before
    It would double
  • Number of H in
    24
  • Which of these is not a state of matter?
    Ice
    Gas
    Solid
    Liquid
  • What is the little number after an element in a chemical equation called?
    Subscript
  • When wood burns, where does some of its mass go?
    It disappears into nothing
    It turns into energy only
    It turns into gases and smoke
    It becomes water
  • A vertical column in the periodic table is called a...
    Group
  • This particle is has a neutral charge, is composed of quarks, and is found inside the nucleus of an atom.
    Neutron
  • What do atoms join together to form?
    Energy
    Molecules
    Liquids
    Gases
  • Balance the following equation:
    2,1, 2
  • A horizontal row in the periodic table is called a...
    Period
  • 3,2,2
  • What is the smallest piece of matter that still retains the property of the element?
    Atom
  • What is matter?
    Only solids and liquids
    Anything that can move
    Something that disappears when burned
    Anything that takes up space and has mass
  • 2,4
  • Which statement is true about matter?
    It can change form but the total amount stays the same
    It disappears when burned
    It can only exist as solids and liquids
    It is only found in living things
  • Is the following equation balanced? Al + O2
    No
  • 2
  • Where would you write a coefficient to balance this equation?
    a number 2 before HgO
  • 4,3,2
  • What is the right part of a chemical equation called?
    Products
  • 2,2
  • Balance this equation:
    1, 3, 2
  • 2,2
  • Is the following equation correctly balanced?
    Yes
  • This particle is positively charged, composed of quarks, and is found inside the nucleus of an atom.
    Proton
  • Which is a physical change?
    Ice melting
    Burning wood
    Rusting iron
    Baking a cake
  • 2,2
  • When ice melts into water, what happens to the molecules?
    They turn into different atoms
    They disappear
    They change color
    They stay the same but move differently
  • How many HCl molecules do you need to balance this equation?
    2
  • This is an organized list of all known elements that are arranged according to repeated changes in properties.
    Periodic Table
  • What are atoms?
    Particles of gas
    Pieces of rock
    A type of molecule
    The smallest pieces of matter
  • What is the positively charged center of an atom that contains protons and neutrons and is surrounded by a cloud of electrons called?
    Nucleus
  • 2,2
  • What is a coefficient?
    The large number in front of a chemical formula.
  • How many atoms of aluminum are on each side of the following equation:
    4
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