Name__________________________________________________Date_____________ Block__________
Chemistry 543
Exam Review Ch 2
Fill in the Blank
Word Bank
Match the term with the correct definition.
Group
1. Oxygen and Sulfur belong to the same __________ on the
periodic table.
2. A mixture where particles are not distributed evenly
throughout is a/an _________________ mixture.
3. In a solution of water and sugar, the sugar is considered
the ________.
4. Oil and vinegar are a considered a ____________ of substances.
Chemical
Physical
Avogadro’s
Constant
Mole
Mixture
Period
23
5. The number 6.02 x 10 is also known as ___________________.
6. The amount of mass per volume of a solution is known as the
_________________.
Heterogeneous
Concentration
Solvent
Physical
7. A unit of measure used to measure large amounts of atoms
is the ___________.
8. A change where the formula of the compound changes
is a ________________ change.
9. Density is an example of a ____________ property.
Short Answer
1. What are 3 physical properties of matter?
2. What are 2 chemical properties of matter?
3. What are the 4 signs that a chemical change has occurred?
4. What is the difference between a physical and a chemical change?
5. Identify the flowing changes as physical or chemical:
a. Toasting bread
____________________________
b. Melting ice
____________________________
c. Dissolving salt in water
____________________________
d. Iron rusting
____________________________
e. Digesting food
____________________________
6. Identify the following properties as chemical or physical:
a. Density
____________________________
b. Flammable
____________________________
c. Reacts with water
____________________________
d. Color
____________________________
e. Melting point
____________________________
7. Using the Periodic table below, identify the following families using their group number:
a. Alkali Metals
______
b. Alkaline Earth Metals
______
c. Noble Gases
______
d. Halogens
______
e. Lanthanides
______
f. Actinides
______
8. Find Mg on the periodic table above…
a. What period is it in?
b. What group is it in?
c. What’s its atomic number? Atomic Mass?
9. The mole is sometimes referred to as the “chemists dozen.” Explain why the mole is useful to a chemist.
10. Write the formula mass of the following compounds
a. CO2
b. C6H12O6
c. H2SO4
d. NaCl
11. The formula mass for Methane (CH4) is written as 16 g/mole. Is this correct? Why?
12. A chemist needs 22 grams of phenol (C6H5OH) for and experiment. How many moles is this?
13. A student needs 0.015 moles of iodine crystals (I2) for an experiment. What mass of iodine crystals
should the student obtain?
14. CRITICAL THINKING: What is the total number of moles in a jar that contains 2.41 x 1024 atoms of
chromium, 1.51 x1023 atoms of nickel and 3.01 x 1023 atoms of copper?
15. Calculate the mass of one gold atom in grams.
16. How many grams of NaCl do you need if you want to make a 700mL solution with a concentration of 23
g/L.
17. What is the % concentration of a solution made with 25 grams CuCl2 and a total mass of 185 grams?
18. How many grams of MgCl2 are present in 60.0 mL of a 0.10 M MgCl2 solution?
19. Name or give the symbol for the following elements, acids and ions:
a. Sodium
____________
f. P
____________
b. Carbonate
____________
g. H2SO4
____________
c. Hydrochloric acid
____________
h. NO3-
____________
d. Iron
____________
i. MnO4-
____________
e. Sulfur
____________
j. K
____________