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13 Cards in this Set

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  • Back
states of matter
the physical forms in which a substance can exist, states include solid, liquid, gas, and plasma
solid
the state in which matter has a definite shape and volume
absorption
the transfer of energy carried by light waves to particles in matter
acceleration
the rate at which velocity changes; an object accelerates if its speed changes, its its direction changes, or if both its speed and direction change
activation energy
the minimum amount of energy needed for substances to react
acid
any compound that increases the # of hydrogen ions when dissolved in water and whose solution tastes sour and can change the color of certain compounds
physical science
the study of matter and energy
scientific method
a series of steps that scientists use to answer questons and solve problems
technology
the application of knowledge, tools, and materials to solver problems and accomplsih tasks
observation
any use of the senses to gather info.
hypothesis
a possible explanation or answer to a question
data
any pieces of info. acquired through experimentaion
theory
a unifying explination for a broad range of hypothesis and observations that have been supported by testing