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ATOMS
PERIODIC TABLE
DEFINITIONS
BEHAVIOR OF MATTER
PHYSICAL AND CHEMICAL CHANGES
100
particles that have a positive electric charge
What are protons?
100
the sum of the protons and neutrons in the nucleus
What is the atomic mass?
100
two or more atoms combined
What is a molecule?
100
the molecular structure is nearly rigid
What is a solid?
100
Does not produce a new substance
What is a physical change?
200
have no electric charge
What are neutrons?
200
the number of protons in an atom
What is the atomic number?
200
anything that has weight and takes up space
What is matter?
200
the atoms and molecules in its structure move around each other without moving apart
What is a liquid
200
produces a new substance
What is a chemical change?
300
particles that have a negative electric charge
What are electrons?
300
Its symbol on the periodic table is O.
What is oxygen?
300
a shorthand way of showing which elements are contained in a molecule
What is a chemical formula?
300
the molecular structure is relatively loose, allowing atoms to move apart independently of each other
What is a gas?
300
a uniform mixing of substances (one substance is dissolved in another substance)
What is a solution?
400
holds electrons in orbit around a nucleus
What is electric force?
400
According to its atomic mass recorded on the periodic, the least dense element
What is helium?
400
refers to compounds produced by living things
What is organic?
400
the three phases of water
What are ice, water, and steam?
400
the material that is dissolved
What is the solute?
500
nuclear particles (neutrons and protons) are held together in a nucleus by this
What is nuclear force?
500
The chemical formula for water (H2O) means there are this many atoms of hydrogen and this many atoms of oxygen in a single molecule of water
What is two hydrogen and two oxygen?
500
the main hydrocarbons found in nature
What are coal, natural gas, and oil?
500
4 PART QUESTION-- a) the temperature at which a solid turns to liquid b) the temperature at which a liquid begins to turn to gas c) changing from a gas to liquid d) the temperature at which a liquid becomes a solid
What is a) melting point b)boiling point c)condensing d)freezing
500
the substance that dissolves the solute
What is the solvent?