Download YOU WILL NOT BE ALLOWED TO SHARE A working calculator

Name: __________________________________
Date: _____________________________________
REVIEW QUESTIONS—ANSWERS
What to bring to the exam? YOU WILL NOT BE ALLOWED TO SHARE
- A working calculator
- Pens/pencils
- You may also bring ONE index card 3”x 5” double-sided with whatever
you want written on it—BUT you may NOT bring anything to help you
read your card (e.g. magnifying glass)
THESE ARE BASIC KNOWLEDGE QUESTIONS! DO NOT RELY ONLY ON THESE QUESTIONS IN YOUR
STUDYING!! USE THESE AS A STARTING POINT TO REMIND YOURSELF OF SOME OF INFORMATION!
1. Describe the Nitrogen cycle.
Nitrogen gas is in the atmosphere. Lightning converts the nitrogen gas into nitrates and nitrites.
Bacteria, also, converts the nitrogen gas into nitrates through a process called nitrogen fixation.
Plants take up the nitrates through their roots. The nitrates make their way through the food
chain. When plants, animals and humans release waste or die, the nitrates go back into the soil.
Special bacteria convert the nitrates back into nitrogen gas and release it into the air.
2. Draw the symbols for the following: battery, light bulb, resistor, ammeter, switch, voltmeter
3. Compare series and parallel circuits.
Series
1 pathway
Current stays the same
Voltage splits
Adding more light bulbs increases resistance
If one bulb goes out, the rest also go out
Parallel
2 or more pathways
Current splits between the pathways
Voltage stays the same
Adding more light bulbs decreases resistance
If one bulb goes out, the rest stay on
4. What is Ohm’s Law?
V=I X R or R = V/I OR I = V/R
5. What are the methods of cleaning an oil spill?
Vacuuming/skimming, bioremediation, burning, dispersal agents
6. What are the 3 Laws of Electric Charge?
- Same charges repel
- Opposite charges attract
- Neutral objects are attracted to any charged object
Name: __________________________________
Date: _____________________________________
7. What are the effects of acid rain?
- Rivers and lakes become more acidic—certain plants/animals can’t handle that so their
population decreases
- Changes the soil by decreasing the amount of nutrients
- Sulfur dioxide irritates respiratory problems
- Speeds up rusting process
- Damages statues and buildings
8. What was Ernst Rutherford’s gold foil experiment?
He shot positive alpha particles towards a very thin sheet of gold foil. He saw that most of the
alpha particles when through the sheet. This meant that atoms are mostly made out of empty
space. Some of the alpha particles also bounced back. This meant that there was some positive
nucleus at the center of the atom that was repelling the alpha particles.
9. What are the word equations of photosynthesis and cellular respiration?
Photosynthesis: carbon dioxide + water + sunlight  sugar + oxygen
Cellular Respiration: sugar + oxygen  carbon dioxide + water + energy
10. What does the term biodiversity mean?
Variety in the species of an ecosystem
11. Name 3 methods used to control invasive species.
Chemical- pesticides
Mechanical- physically removing the species or putting up barriers
Biological- using other animals to eat the invasive species
12. What is a food web?
Many food chains intertwined
13. How do you calculate the efficiency of an electrical device?
𝐸𝑓𝑓𝑖𝑐𝑖𝑒𝑛𝑐𝑦 =
𝐸
𝐸
× 100
14. What is a food chain? Explain what the arrows in the food chain mean
A food chain shows who eats who in an ecosystem. The arrows show the flow of energy.
15. How do you calculate that cost of operating an electrical device?
Step 1: Make sure that the power is in kiloWatts. If not, convert it by dividing the number of
Watts by 1000.
Step 2: Make sure that the time is in hours. If not, convert it.
Step 3: Use the formula operating cost = power x times x cost of electricity