Supplemental Instruction
Iowa State University / Leader: / Allison
Course: / Chem 163
Instructor: / Dr. Appy
Date: / 9/16/14
1. Define Matter: Anything that has mass and volume
2. Matter can exist as which of the following?
a. As a homogenous mixture of pure substances
b. A pure substance
c. As a heterogeneous mixture of pure substances
d. As all of the above
3. To be a compound, a substance must
a. Be made from more than one type of element
b. Not be a mixture
c. Be homogenous
d. Be all of the above
4. An element can also be a compound.
a. True
b. False
5. When a pure substance melts, it
a. Changes state
b. Changes from a liquid to solid
c. Sublimes
d. Undergoes a chemical change
6. Mud is an example of what type of matter?
a. Element
b. Compound
c. Homogenous mixture
d. Heterogeneous mixture
7. A KitKat bar melting is a(n) ______.
a. Chemical change
b. Physical change
c. Unfortunate event
d. None of the above
8. Chemical or physical change?
wood cut into pieces (P)
rusted rail (CH)
burning gasoline (CH)
bended pipe (P)
- Heterogeneous or homogeneous mixture?
NaCl solution (homogeneous)
sugar solution (homogeneous)
metal alloy (brass) (homogeneous)
orange juice with pulp in it(Heterogeneous)
10. In a chemical reaction,
a. A physical change takes place
b. One or more substances are converted into different substances
c. Elemental substances change into different elements
11. How many significant figures are in
a. 0.0678 ----- 3 sigfigs
b. 0.009050 ------4 sigfigs
c. 10090.0 ------6 sigfigs
d. 9.0 ------2 sigfigs
12. Which of the following subatomic particles has the least mass?
a. Neutron
b. Electron
c. Proton
13. Isotopes of an element have the same number of Protons but different number of Neutrons
14. Express each mass in grams, both in standard notation and scientific notation:
a. 563 mg = 0.563 g or 5.63x10^(-1)g
b. 8.26 mg = 0.00826 g or 8.26 x10^(-3)g
c. 139 kg = 139000g or 1.39 x 10 ^ 5g
15. It takes 487.5 J to heat 25.0g of Copper from 25.0 °C to 75.0 °C. What is the specific heat in J/g ×°C?
0.390 J/ g × °C
16. What is the heat in Joules required to raise the temperature of 25.0g of Water from 0.0°C to 100°C? The specific heat of water = 4.18 J/g ×°C
10, 500 J
17. Gold has a Density of 19.30 g/mL. What is the volume (in mL) occupied by 1.20 lb of Gold? (1 lb = 454 g). Show all work and express answer with the correct number of significant figures.
28.2 mL
18. 51.00 g of NaN2 decomposes to give 28.00 g of N. What is the percent composition of N in NaN2?
54.90% N
19. True or False. Nonmetals tend to become cations?
20. Write the correct charge for each subatomic particle
a. Protons +
b. Neutrons no charge
c. Electrons -
21. The red light from a helium-neon laser has a wavelength of 633 nm. What is the energy of one photon?
3.13 x 10 ^ (-19) J
22. Fill in the table.
Protons / Neutrons / Electrons / Net Charge40K+ / 19 / 21 / 18 / +
19F / 9 / 10 / 9 / 0
40Ca / 20 / 20 / 20 / 0
31P / 15 / 16 / 15 / 0
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