Discussion Questions:

List 3 safety precautions taken in this lab.

To wear safety goggles at ALL TIMES during the lab. If you have long hair to tie it back. Do not throw the burning pieces of wood in the garbage until you have dipped it in water.

What changes did you observe in your reactants? I.e. what were some observations of new products?

When the acid and mossy zinc were added together it started fizzing. The water kept fizzing during the whole experiment and changed into a light grey colour. When the zince and acid strated fizzing it would create hydrogen gas, which would be captured into the test tube. Once it was in the test tube we took a lit wood splint and help in over top of the hydrogen gas. once the fire and gas touched it made a ‘pop’ sound and for the splitest second the gas turned a orange colour.

a. How did the temperature change?

The tempertaure of the flask became hotter due to the fact that it was creating hydrogen gas. When the hydrogen gas was transfered into the test tube then the test tiube also became hot. Also I found that the test tube was the most hot after it created the little ‘pop’. It could have been hotter because when the hydrogen gas (being already hot) and the fire (being very hot) created the ‘pop’ the heat could have mixed together and created even more heat.

Look up the definitions, was the lab endothermic or exothermic? Explain your reasoning.

It is an exothermic lab because exothermic means that heat is being produed from the reaction (Exo= to exit, Therm= heat) . In the lab we putt zinc and acid together to create hydrogen gas, which was hot. The heat from the lab was beaing released, therefore meaning it is an exothermic lab.

Write out the formula for the chemical equation and balance it.
Zinc + hydrochloric acid produces Hydrogen gas + zinc chloride

Zn + HCl 》 H + ZnCl
[ ] Zn + [2] HCl 》 [ ] H + [ ] ZnCl

Look up Synthesis, Decomposition, Single Replacement, and Double Replacement Reactions. What type of reaction is this? Explain.

It is a single replacement reaction. In a single replacement reaction an element reacts with a compound and takes the place of an element within that compound. In a single replacement reaction a metal switches places with a metal and a non-metal switches with a non-metal. In this case as you can see { Zn + HCl = H + ZnCl } that Zinc and Hydrogen switched spots. In a single replacement reaction the elements switch when there is a better (more reactive) element nearby to switch with.

How did the change in surface area of the zinc affect the reaction rate? Which reacted faster?

I believe that the larger surface area would react faster because the solid-phase reactant increases the number of collisions per second and therefore increases the reaction rate.

How did the change in the concentration of HCl affect the reaction rate? Which reacted faster (1 M or 3M)?

3m would react faster because of the collision rate. If you had a beaker of 3m and 1m of HCl and dropped zinc in each one, the one with 3m would react faster because the zinc would come in contact with it first.