1. Science 09 Ruo
Final Exam Review

2. Using a periodic table, find the atomic mass and write it properly for:
Hydrogen 1H
Helium
4He
Carbon
12C
Oxygen
16O

3. Using a periodic table, find the atomic mass and write it properly for:
Magnesium
24Mg
Calcium
40Ca
Aluminum
27Al
Silicon
28Si

4. Write the fusion equations for
→ Mg
2(12C )→ Mg
→ He
4(1H )→ He
→ O
4(4He)→ O

5. Write the fusion equations for
2(12C ) + 4He → 28Si
2(14N) → 28Si
→ Al
1H C + 14N→ Al
11B C + 4He→ Al
→ Fe
2 (28Si) → 56Fe

6. Drawing Bohr Diagrams Start by drawing the nucleus
p = atomic number (number of protons)
n = number of neutrons
The number electrons = number of protons
The electrons fill the orbits around the nucleus
First orbit can hold up to 2 electrons
Second orbit can hold up to 8 electrons
Third orbit can hold up to 8 electrons

7. Draw the Bohr Diagram for Ar
Argon: Mass=40, Atomic Number = 18
Number of neutrons = Atomic Mass – Atomic Number
=40 – 18 = 22 neutrons
p18
n22

8. Draw the Bohr Diagram for P
Phosphorous: Mass=31, Atomic Number = 15
Number of neutrons = Atomic Mass – Atomic Number
=31 – 15 = 16 neutrons
p15
n16

9. Draw a circuit with: Two resistors in series Two batteries in parallel
Connect an ammeter to measure the current of ONE battery
Connect a voltmeter to measure the current of ONE resistor
Answer on the next slide

10. Suppose:
The voltage of each battery was 9 V
The voltage of the resistor was 3 V
The current was 1.5 A
What is the voltage of the other resistor?
Ans 6 V
voltage of the sources have to add up to the voltage of loads (resistors). The two batteries are in parallel, so their voltage is 9 volts
What is the resistance of the resistor connected to the voltmeter?
V = IR
3 = 1.5(R)
2 = R The resistance is 2 ohms
What is the resistance of the other resistor?
6 = 1.5(R)
4 = R The resistance is 4 ohms

11. Ohm’s Law V = I × R
What is the resistance of a hair dryer which is plugged into a 110 V outlet and draws 10 A of current?
Answer on next slide

12. Ohm’s Law V = I × R
What is the resistance of a hair dryer which is plugged into a 110 V outlet and draws 10 A of current?
V = I × R
110 = 10 × R
11 ohms = R

13. Efficiency
Applying conservation of energy, we know that no process can be 100% efficient
% Efficiency = energy out × 100
energy In
What is the efficiency of a car engine that uses 15E7 joules of gasoline and outputs 10E7 joules of energy?
Click to see answer

14. Efficiency
What is the efficiency of a car engine that uses 15E7 joules of gasoline and outputs 10E7 joules of energy? % Efficiency = energy out × 100 energy In = 10E7 × E7 = 67%

15. What’s my risk?
A couple of parents do not have Huntington’s disease, but are carriers of the Huntington’s gene.
What is the genotype of a person who has Huntington’s disease?
What are the genotypes of the parents?
Create a punnet square to figure out the risk of their children having Huntington’s disease.
Answer on the next slide

16. What is the genotype of a person who has Huntington’s disease?
If we use the letter h, the genotype would be hh (homozygous recessive)
What are the genotypes of the parents?
Parents would be heterozygous Hh
Create a punnet square to figure out the risk of their children having Huntington’s disease. H h HH Hh hh
There is a 25% chance of their children getting Huntington’s disease
There is a 50% chance their children will be carriers of the Huntington’s gene
There’s a 25% chance that their children would not be carriers of the Huntington’s gene

17. 1 AU = 1.49E8 km
Earth is 1 AU from the sun. If Mercury is 57.9E6 km from the sun, how many AU is Mercury from the sun?
1 AU = x AU
1.49E E6
1 × 57.9E6 = x × 57.9E6
1.49E E6
0.39 = x

18. Diploid, haploid Body cells are Diploid Gametes are Haploid
If the diploid number is 24, the haploid number is 12

19. Metric Conversions 112 MW to watts Convert 35 mV to volts
Convert 10 kΩ to mΩ
10,000,000 mΩ
Convert 500 mA to A
0.500 A

20. Light Years (ly)
The Milky Way is 100,000 ly across. How long does it take light to travel across the Milky Way?
100,000 years
A Hubble Deep Field galaxy is 12.7E9 ly away. How long did it take the light to reach Earth?
12.7E9 years (12.7 billion years)

21. Exponential Notation Write 56.5E5 in long form 5,650,000
Write 230,000 in exponential notation
230E3 or 2.3E5 or 2300E2 etc
Write 700E-9 in long form
What is 75E9 ÷ 25E6?
3E3 = 3000