Physical and Chemical Changes
A substance formed when two or more elements are joined together.
What is a compound?
The areas around the nucleus of an atom that house the electrons.
What are energy levels?
Is like a recipe for a compound, telling what kinds of atoms, and how many are in the compound.
What is a chemical formula?
Formed when substances are combined, but no reaction has taken place.
What is a mixture?
A statement that uses symbols, chemical formulas, and numbers to stand for a chemical reaction.
What is a chemical equation?
A change that produces one or more NEW substances with new chemical properties.
What is a chemical change?
The attracting force that holds atoms together.
What is a chemical bond?
The numbers in a formula that tell how many of each atom are in the compound; the world literally means "below writing."
What is subscript?
A mixture where one substance is dissolved into another.
What is a solution?
Used instead of an = sign in a chemical equation to show what a reaction yields.
What is an arrow (-->).
A change where only the appearance of a substance changes, but not it's chemical properties.
What is a physical change?
The number of electrons the K level (or level nearest the nucleus of an atom) can hold.
What is 2?
The total number of atoms in sucrose C12H22O11.
What is 45 total atoms (12+22+11).
The substance in a solution capable of dissolving one or more other substances (water is one).
What is a solvent?
The substances that are altered in a chemical reaction (the starting materials).
What are reactants?
Ice cream melting is an example of this type of change.
What is a physical change?
The number of electrons the N level of an atom can hold.
What is 32 electrons?
A group of two or more atoms that acts like one atom, and is given a new name (like hydroxide OH).
What is a radical?
A substance that is dissolved in a solution.
What is a solute?
The rule that matter cannot be created or destroyed in a chemical or common physical change.
What is the "Law of Conservation of Matter"?
Baking a cake is an example of this type of change.
What is a chemical change?
An atom that has either a positive or negative charge (usually due to chemical bonds).
What is an ion?
The elements in H2SO4, and the total number of atoms in the compound.
What are Hydrogen(2), Sulfur(1), and Oxygen(4); for a total of 7 atoms in the compound?
A chemical change where elements are combined or rearranged.
What is a chemical reaction?
Add the necessary subscripts to the product of this reaction to create a balanced equation:
H2SO4 + Zn --> Zn S O + H
The balanced equation:
H2SO4 + Zn --> ZnSO4 + H2