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Science-2-U Chemistry

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  • What is an atom?
    An atom is the smallest particle of any substance.
  • On the pH scale, which numbers represent acids?
    Numbers less than 7 represent acids.
  • When you mix baking soda and vinegar you get a chemical reaction. What new substance is formed (the bubbles)?
    Carbon dioxide
  • A group of different types of elements stuck together is called a ________________
    A group of different types of elements stuck together is called a MOLECULE.
  • What is phenolphthalein?
    Phenolphthalein is a chemical compound which turns pink/red in an alkaline and clear in an acid. It is used in titrations.
  • Atoms are made from even tinier pieces known as subatomic particles. What are these 3 things called?
    Protons, neutrons and electrons.
  • What is CHEMISTRY? The study of _______________________
    the scientific study of ELEMENTS and the MOLECULES they make with other elements.
  • When performing a filtration, what is the name of the substance you collect on the filter paper?
    Residue
  • On the pH scale, which number represents neutrals?
    On the pH scale, number 7 represents neutrals.
  • Is vinegar an acid or a base?
    Acid
  • Name one indication that a chemical reaction has occurred.
    color change, temperature change, new substance is formed
  • What is the name of the ordered arrangement of the chemical elements into rows and columns?
    The Periodic Table
  • On the pH scale, which numbers represent bases?
    On the pH scale, the numbers higher than 7 represent bases.
  • A person who studies and works with chemicals is known as a ___________.
    A person who studies and works with chemicals is known as a chemist.
  • What is a precipitate in chemistry?
    A precipitate is a solid that forms from a chemical or physical reaction when 2 or more solutions are combined.
  • when molecules meet with other molecules they usually change each other. This is known as a ______________________.
    when molecules meet with other molecules they usually change each other. This is known as a CHEMICAL REACTION.
  • What is an element?
    An element is a certain kind of ATOM. A substance that is made up of only 1 type of atom.
  • What is the name of the scientific equipment pictured here?
    Erlenmeyer flask
  • Is ammonia an acid or a base?
    Base
  • Scientists, like chemists, must use the ______________ to measure and weigh so that they can share their findings with the rest of the world.
    Scientists, like chemists, must use the metric system to measure and weigh so that they can share their findings with the rest of the world.
  • Who invented the Periodic Table of Elements?
    In 1869, Russian chemist Dmitri Mendeleev created the framework that became the modern periodic table.
  • The liquid that passes through a filter is called the __________________.
    The liquid that passes through the filter is called the FILTRATE.
  • Which measurement is more accurate, millimeters or meters?
    millimeters
  • What is the atomic number of Hydrogen?
    Hydogen's atomic number is 1
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