Problem 1
Which of the following is evidence for a chemical reaction? (a) Heating copper in air produces a black solid. (b) Heating copper in a vacuum gives a red-brown film.
Problem 2
Which of the following is evidence for a chemical reaction? (a) Heating baking soda releases water vapor. (b) Heating violet iodine crystals gives a purple gas.
Problem 3
Which of the following is evidence for a chemical reaction? (a) Mixing two aqueous solutions produces a precipitate. (b) Mixing two colorless solutions gives a blue solution.
Problem 4
Which of the following is evidence for a chemical reaction? (a) Mixing two aqueous solutions produces gas bubbles. (b) Mixing two solutions produces an insoluble solid.
Problem 5
Which of the following is evidence for a chemical reaction? (a) Dropping sodium metal into water gives a yellow flame. (b) Dropping iron metal into acid produces gas bubbles.
Problem 6
Which of the following is evidence for a chemical reaction? (a) Dropping potassium metal into water gives a violet flame. (b) Dropping zinc metal into acid produces gas bubbles.
Problem 7
Write a chemical equation for magnesium metal combining with bromine liquid to give magnesium bromide solid.
Problem 8
Write a chemical equation for iron metal combining with chlorine gas to give yellow ferrous chloride solid.
Problem 9
Write a chemical equation for solid zinc hydrogen carbonate decomposing to yield solid zinc carbonate, water, and carbon dioxide gas.
Problem 10
Write a chemical equation for solid cadmium hydrogen carbonate decomposing to yield solid cadmium carbonate, water, and carbon dioxide gas.
