ch7 MgO lab

Find the % of oxygen in Magnesium oxide: Magnesium oxide lab: done with crucibles, see p258-9 of the text. (e book, ch7 student resources, labs) When one heats magnesium it combines with oxygen to makes magnesium oxide. Using the formula, you can find the actual % oxygen. From the lab data, you can find the experimental % oxygen in magnesium oxide. You will also see if the mole ratio determined by experiment corresponds to the actual mole ratio. See pictures and sample data below.

Magnesium oxide lab data:

mass of crucible:

mass of crucible and magnesium:

PURPOSE: Find the empirical formula of magnesium oxide by experiment.

PROCEDURE: As described by teacher & see p 258-259 (e book, ch7 student resources, labs)

DATA:

Mass of empty crucible_________

Mass of crucible and metal__________

Mass of crucible and product_________

CALCULATIONS:

Mass of metal used___________

Molar mass of metal_________

Moles of metal used__________ work:_______________________

Mass of oxygen in product _________

Molar mass of oxygen_________

Moles of oxygen in product___________ work;________________________

Mass of product__________

Formula of product _________

Molar mass of product_________

Moles of product present___________ work:_______________________

Mole ratio of oxygen and metal (whole#) __________ work:________________

Experimental empirical formula of product ( based on ratio) _____________

Actual formula of product (from oxidation numbers) _______________

Experimental % metal in product from mass of metal and mass of product ________ work:___________

Actual % metal in compound from formula mass__________ work:________

% error __________ work:__________________________

CONCLUSIONS:

Write a word equation and a balanced chemical equation for the reaction. Include states.

What mole ratio were you expecting? Why ?

Did it appear that matter was created or destroyed? Why?

When wood burns does it appear that matter is created or destroyed? Why?

Do you think that matter is really created or destroyed? Why? Describe an experiment that could be done to provide evidence for your answer.