A 2.95 g piece of zinc (density = 7.14 g/mL) is added to a graduated cylinder that contains 12.13 mL H2O. What will be the final volume reading on the graduated cylinder?

12.54mL

Explanation:

Step 1:

Data obtained from the question:

Mass of Zn = 2.95g

Density of Zn = 7.14 g/mL

Volume of water = 12.13mL

Final volume reading of cylinder =..?

Step 2:

Determination of the volume of Zn. The volume of Zn can be obtained as follow:

Density = Mass /volume

7.14 = 2.95/volume

Cross multiply

7.14 x Volume = 2.95

Divide both side by 7.14

Volume = 2.95/7.14

Volume of Zn = 0.41mL

Step 3:

Determination of the final volume reading of the cylinder.

The final reading of the cylinder will be the addition of the volume of water and the volume of Zn as shown below:

Final volume of cylinder = volume of water + volume of Zn.

Volume of water = 12.13mL

Volume of Zn = 0.41mL

Final volume =..?

Final volume of cylinder = 12.13 + 0.41

Final volume of cylinder = 12.54mL

Therefore, the final volume reading of the cylinder is 12.54mL

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.