For each of the following: (a) predict the products and write the balanced equation (b) classify the type of reaction 1. Liquid propanol (C3H8O) burns. 2. Aqueous sodium sulfite is added to nitric acid. 3. Aqueous ammonium hydroxide is added to phosphoric acid. 4. Aluminum metal is added to aqueous copper(II) sulfate. 5. Rubidium metal is added to water. 6. Solid sodium hydrogen carbonate is added to hydrochloric acid. 7. Zinc metal is added to nitric acid.

What is a scientific theory? a. a scientist's guess about how something works b. the results of an experiment obtained using the scientific method c. a proven fact that will never change d. an idea that is backed by data from many sources

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled