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(1) Label each of the following as either a physical change or a chemical reaction:
(a) An iron nail rusts; (b) An ice cube melts; (c) A puddle of water evaporates.
(2) Label each of the following as either an intensive property or an extensive property:
(a) Mass; (b) Volume; (c) Density; (d) Temperature.
(3) (a) Construct a model to represent a heterogeneous mixture of two different compounds.
(b) Construct a model to represent a homogeneous mixture of two different compounds.
(4) How many significant figures are contained in each of the following numbers?
(a) 0.00261; (b) 24; (c) 240; (d) 2.40; (e) 5.20 x 102.
(1) Label each of the following as either a physical change or a chemical reaction:
(a) An iron nail rusts; (b) An ice cube melts; (c) A puddle of water evaporates.
(2) Label each of the following as either an intensive property or an extensive property:
(a) Mass; (b) Volume; (c) Density; (d) Temperature.
(3) (a) Construct a model to represent a heterogeneous mixture of two different compounds.
(b) Construct a model to represent a homogeneous mixture of two different compounds.
(4) How many significant figures are contained in each of the following numbers?
(a) 0.00261; (b) 24; (c) 240; (d) 2.40; (e) 5.20 x 102.
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