Problem 1
Classify each statement as a law, a theory, an experiment, a hypothesis, a qualitative observation, or a quantitative observation. a. Ice always floats on liquid water. b. Birds evolved from dinosaurs. c. According to Albert Einstein, mass \(X\) speed of light = energy d. When \(10 \mathrm{~g}\) of ice was added to \(100 \mathrm{~mL}\) of water at \(25^{\circ} \mathrm{C}\), the temperature of the water decreased to \(15.5^{\circ} \mathrm{C}\) after the ice melted. e. The ingredients of Ivory soap were analyzed to see whether it really is \(99.44 \%\) pure, as advertised.
Problem 1
How would a chemist categorize each example of matter? a. saltwater b. soil c. water d. oxygen
Problem 2
How would a chemist categorize each example of matter? a. coffee b. hydrogen c. an egg
Problem 2
Classify each statement as a law, a theory, an experiment, a hypothesis, a qualitative observation, or a quantitative observation. a. Measured amounts of acid were added to a Rolaids tablet to see whether it really "consumes 47 times its weight in excess stomach acid." b. Heat always flows from hot objects to cooler ones, not in the opposite direction. c. The universe was formed by a massive explosion that propelled matter into a vacuum. d. Michael Jordan is the greatest pure shooter ever to play professional basketball. e. Limestone is relatively insoluble in water but dissolves readily in dilute acid with the evolution of a gas. f. Gas mixtures that contain more than \(4 \%\) hydrogen in air are potentially explosive.
Problem 3
a. Classify each as being element, compound, heterogeneous mixture, or homogeneous mixture (solution): air at Furman University, Furman Lake water, copper wire, and Furman tap water. b. What is the difference between a heterogeneous mixture and a homogeneous mixture? Give an example of each. c. Which is/are physical change(s): burning of fuel, digestion of food, salt dissolving in water, copper conducting electricity, and water boiling.
