20 POINTS! (NOTE, WRITE THE NET IONIC REACTION WITH THE SOLUBILITY STATES AND CHARGES, NOT THE MOLECULAR REACTION) . Question is- Write a net ionic equation for the overall reaction that occurs when aqueous solutions of sodium hydroxide and carbonic acid are combined. Assume excess base.

What is an example of a physical property?

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.)

8. what happens to matter during a chemical reaction