7. An ore sample weighing 8.60 kg is found to contain 1.40 kg of copper. a). Calculate the percent copper in the ore. Percent - Part xloo
Whole
P = 1.400g copper = x 100
16.3
Problem-solving:
% Cu
ore
8. 60kg
b) Write the percent value from a) into two conversion factors.
% value
16:3_%Cu
(from the answer a)
Two conversion factors
16.3 copper
8.60 ore
8.60ore
16.3 copper
or
c) How many kg of copper are there in 125 kg of ore? Solve this by factor-label method
using a conversion factor in part b).

What is the chemical formula of the following compound

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

These questions are based on the attached photo. the experiment is about burning magnesium metal with oxygen. 1. write the balanced chemical equation for the reaction you are performing. 2. calculate the mass of magnesium metal used in each trial. o trial 1: o trial 2: 3. calculate the actual yield of magnesium oxide for each trial. o trial 1: o trial 2: 4. magnesium is the limiting reactant in this experiment. calculate the theoretical yield of mgo for each trial. o trial 1: o trial 2: 5. determine the percent yield of mgo for your experiment for each trial. o trial 1: o trial 2: 6. determine the average percent yield of mgo for the two trials. your company currently uses a process with a similar cost of materials that has an average percent yield of 91 percent. if the average percent yield of this process is higher than that, this could save the company money. what is your recommendation to the company? support your recommendation using your data, calculations, and understanding of stoichiometry gathered from this lab.