Name:________________________________________________ Date:________________________________ Pd:_____
Chapter 6 Pre-Assessment
1. ________________Name a metric unit that measures mass.
2. ________________How many significant figures is 0.0304g?
3. ________________How many significant figures is 3040g?
4. ________________What is 5.2g / 35.45g * 6.022 (with the correct significant figures)?
5. ________________Convert 0.721 kg to g.
6. ________________A 70.53g cookie is 26.51g of flour, 6.34g egg, 14.96 sugar, 15.61g butter, and 7.11g other
components. What percent by mass is butter?
7. ________________What is the chemical formula for sulfur trioxide?
8. ________________What is the chemical formula of lead(IV) oxide?
9. ________________You take a huge bag of dimes to the bank. Rather than count the dimes the bank teller uses a
scale to find that the mass of the dimes is 3358g. If the average mass of a dime is 2.30g, how much money (in dollars)
are the dimes worth?
10a. ________________A student sends 112 texts on Monday, 87 on Tuesday, 155 on Wednesday and 33 on Thursday.
What was her average number of texts per day?
10b. ________________If she had a texting plan that charged her 7.10 cents per text, what would her average charge
per day be?
11. The ______________________________________ of a substance is the mass (in grams) of 1 mole of the substance.
12. ________________________Name the element and the isotope of that element that a mole is defined according to.
13a. ________________(2pts) A farmer sells concord (purple) grape seeds in bags of 6022 seeds. If the whole bag has a
mass of 15.0g, what is the average mass of 1 grape seed?
13b. ________________(2pts) How many bags (or partial bags) will 1471 seeds make?
13c. ________________(2pts) The farmer now decides to sell bags of seeds for plants that grow green grapes. To make
a fair comparison, these bags have 6022 (green) grape seeds. If the average mass per bag of green-grape seeds is 12.3g,
then how many seeds are there in 65.1g of these seeds?
14a. ________________(2pts) One way to use the average atomic mass for each element on the periodic table is to
realize that it shows the mass of each element per “bag” of 6.022 x 1023 atoms of the element. (6.022 x 1023 is called a
“mole.”) If 6.022 x 1023 atoms of iron have a mass of 55.85g, what is the mass of 5.00 x 1025 atoms of iron?
14b. ________________(2pts) How many atoms of iron are there in 1.00g of iron?
14c. ________________(1pt) What is the molar mass of zinc?
14d. ________________(1pt) If you have 8.00g of oxygen, and the same number of chromium atoms as oxygen atoms,
what mass of chromium do you have?