lesson 3
a change in matter in which the matters identity does not change
what is a physical change?
the temperature at which a solid changes to a liquid
what is melting point?
the reverse process of condensation
what is boiling?
matter changes into a different type of matter with new & different properties than before
what is a chemical change?
the formulas & symbols to the left of the arrow in an equation are
what are reactants?
change in size, shape, or state of matter are examples of
what are physical changes?
the point at which a gas becomes a liquid
what is condensation?
the amount particles of a physical change are the same before & after the change occurs; this supports the idea of
what is conservation of mass?
what is the formation of a new substance?
when the # of atoms before a reaction are equal to the # of atoms after a reaction, this shows a
what is a balanced equation?
this must be added or removed to matter in order to change the state of matter
the reverse process of melting
what is freezing?
characteristics of matter observed as it changes to a different type of matter
the breaking apart, colliding, & rearranging of atoms is called a
what is a chemical reaction?
the formulas & symbols to the right of the arrow of an equation are
what are products?
particles move slower when thermal energy is
what is removed?
particles of matter move faster when what is added?
what is thermal energy?
ability to rust, burn, & decompose are
what are chemical properties?
chemical formulas & other symbols are used to write a
what is chemical equation?
the speed/time at which a reaction takes place
what is chemical reaction rate?
this occurs when solids change directly to a gas
sublimation
this occurs when a gas changes directly to a solid
what is deposition?
4 signs of a chemical change
what are bubbles, color change, odor change, energy change?
the small numbers following a chemical symbol are
what are subscripts?
increasing temperature, concentration, & surface area will usually
what is increase reaction rate?