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chapter 1
introduction
1.7 (a) Chemical property. Oxygen gas is consumed in a combustion reaction; its composition and identity are changed.
(b) Chemical property. The fertilizer is consumed by the growing plants; it is turned into vegetable matter (different composition).
(c) Physical property. The measurement of the boiling point of water does not change its identity or composition.
(d) Physical property. The measurement of the densities of lead and aluminum does not change their composition.
(e) Chemical property. When uranium undergoes nuclear decay, the products are chemically different substances.
1.8 (a) Physical change. The helium isn`t changed in any way by leaking out of the balloon.
(b) Chemical change in the battery.
(c) Physical change. The orange juice concentrate can be regenerated by evaporation of the water.
(d) Chemical change. Photosynthesis changes water, carbon dioxide, etc., into complex organic matter.
(e) Physical c
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