Chem. Test Ch. 1A 2015
Make sure you record your answers on the scantron
Questions 1-20: Label the following as to whether the change represented was
a) physical or b) chemical.
1) Mixing your sulfur and iron together in Lab #1
2) Filtering your salt/sand/water mixture in Lab #1
3) Burning methane in a Bunsen burner in Lab #1
4) Our dry ice from the first day subliming
5) Blending a hot dog
6) My truck rusting in the teachers parking lot
7) A piece of last years lunch in your locker rotting
8) you digesting a Taco from Taco Bell (if that is possible)
9) An exped student digesting bark because they forgot their dried jerky
10) breaking big rocks into little rocks (like you’re in jail)
11) Bending a piece of copper wire until it breaks
12) dissolving Kool Aide into water
13) you leave your “drinkie” on your nightstand and it evaporates over night
14) Ingested iron filings (from your Captain Crunch cereal) “dissolve” in your stomach acid
15) You use crucible tongs (instead of a test tube holder) to pick up a test tube and it falls and breaks
16) the acid from the test tube in # 15 eats into the lab top
17) the brilliant (and handsome) Dr. Lambert quickly neutralizes the acid spill with a base
18) because you used the wrong equipment again Dr. Lamberts face (and ears) turn red
19) as you fear for your well-being you feel cool on your forehead as sweat evaporates
20) never missing a chance to do chemistry, Dr. Lambert collects the sweat from # 19 and uses fractional crystallization to find it is 95% water 4% salt and 1% of trace chemicals
Questions 21-35: Match the following to the type of matter they represent
a) element, b) compound, c) homogeneous mixture, or d) heterogeneous mixture.
21) The iron filings you used in Lab #1
22) The sodium hydrogen carbonate in Lab #1
23) The sulfur/iron mixture from Lab #1
24) air
25) concrete
26) the gas in a helium balloon
27) carbon dioxide gas
28) blood
29) Cuyahoga river water
You are parched and want some tasty Kool Aid. First, you find a packet of Kool Aid (#30). After opening the packet you pour it into your pitcher and add 1 cup of sugar (#31). Then you fill the pitcher up with distilled water (#32). After mixing you have a wonderful drink (#33). You pour this into a plastic cup (#34) and plop in a lemon wedge (#35).
Questions 36-40: Label the following as to whether the property of pure water represented is
a) physical or b) chemical.
36) It decomposes into hydrogen and oxygen
37) It has a boiling point of 100oC
38) It is a colorless liquid
39) Sugar dissolves in it
40) It’s density is 1.0 g/mL
41) All of the following are physical properties of matter EXCEPT _____.
A) explosiveness
B) hardness
C) melting point
D) color
E) mass
42) Physical properties of a substance include _____.
A) density and hardness B) melting and boiling points
C) color and odor D) all of the above
43) All of the following changes to a metal are physical changes EXCEPT _____.
A) polishing B) cutting C) melting D) bending E) rusting
44) Which of the following is NOT a physical change?
A) the spoiling of cheese B) the cutting of cheese C) the melting of cheese
45) Which of the following does NOT involve a physical change?
A) grinding B) mixing
C) tarnishing D) melting
46) Which of the following is a heterogeneous mixture?
A) air B) soil C) steel D) brine
47) Which of the following is a true statement about compounds?
A) They have variable compositions.
B) They have properties similar to those of their constituent elements.
C) They can be physically separated into their constituent elements.
D) They are pure substances.
48) A copper-colored wire changes to a darker color after it is heated and then cooled. What type of change has likely taken place to cause this color change?
A) a chemical change
B) a physical change
C) neither a physical nor a chemical change
49) A chemical change occurs when a piece of wood _____.
A) is painted B) is cut C) decays D) is split
50) When paper becomes yellow-brown in color upon exposure to sunlight, what type of change is likely taking place?
A) a physical change
B) a chemical change
C) neither a physical nor a chemical change