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– Nelson Mandela

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Worksheet 8

Worksheet 8

Q CHEM 9 – W8 20 pts 1. On a separate sheet of paper, briefly write definitions for each of the following vocabulary words. Attach that paper to the back of this worksheet. 2. What is something that you should NEVER do when balancing chemical equations? 2 points3. Determine the molar mass of the substance Na2SO4. Show your work. 3 points

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1.balancing chemical equations, moles, molar mass, Avogadro’s number, activation energy, reaction rate. balancing chemical equations: adding coefficients in front of each product and reactant in a chemical equation to make sure the number of each atom is equal in the reactant and product side Moles: is the quantity equal to 6.02 x 10^23 of items Molar mass: mass in gram of one mole of a pure substance Avogadro’s number is equal to 6.02 x 10^23Activation energy is the minimum energy required to initiate a reaction Reaction rate is how fast the reaction occurs at a time