I need someone to check my work and see if it did it right or not. I skip some of them because I do not know them, and I hope you guys can help me. This is my final study guide for my final test in physical science. Please help me out!
Calulating Density
Density = Mass/Volume
1. What is the density of carbon dioxide gas if 0.196g occupies a volume of 100 mL?
ANSWER: 0.00196 g/mL
2. A block of wood 3.0 cm on each side has a mass of 27 g. What is the density of this block
ANSWER: 1 g/cm^3
3. An irregularly shaped stone was lowered into a graduated cylinder holding a volume of water equal to 2.0 mL. The height of the water rose 7.0 mL. If the mass of the stone was 25g, what was its density?
ANSWER: 5 g/mL^3
4. A 10.0 CM^3 sample of copper has a mass of 89.6 g. What is the density of copper?
ANSWER: 8.96 g/cm^3
5. Silver has a density of 10.5g/CM^3 and gold has a density of 19.3 g/CM^3 . Which would have a greater mass, 5cm^3 of silver or 5cm^3 of gold?
ANSWER: Gold
6. Five mL of ethanol has a mass of 3.9g, and 5.0 mL of benzene has a mass of 4.4g. Which liquid is denser?
ANSWER: Benzene.
7. A sample of iron has the demensions of 2 cm x 3 cm x 2cm. If the mass of this rectangular-shaped object is 94g, what is the density of iron?
ANSWER: 7.83 g/cm^3
Acceleration Calculations
Acceleration = Final velocity - initial velocity/time
Initial Velocity Final Velocity Time Acceleration
1. 0 km/hr 24 km/hr 3s = 8 km/hr/s
2. 0 m/s 35 m/s 5s = 7 m/s/s
3. 20 km/hr 60 km/hr 10s = 4 km/hr/s
4. 50 m/s 150 m/s 5s = 20 m/s/s
5. 25 km/hr 1200 km/hr 2mins = 587.5 km/hr/m
6. A car accelerates from a standstill to 6 km/hr in 10 second. What is its acceleration?
ANSWER: 0.6 km/hr/s
7. Acar accelerates from 25 km/hr to 55 km/hr in 30 seconds. What is its acceleration?
ANSWER: 1 km/hr/s
8. A train is accelerating at a rate of 2 km/hr/s. If its inital velocity is 20 km/hr, what is its velocity after 30 seconds?
ANSWER: 80 km/hr
9. A runner achieves a velocity of 11.1 m/s 9s after he begins. What is his acceleration? What is his distance did he cover?
ANSWER: 1.23 m/s/s, distance is 49.95 m
Calculating Power
Power = Work/time
1. A set of pulleys is used to lift a piano weighing 1000 newtons. The piano lifted 3 meters in 60 seconds. How much power is used?
ANSWER: 500W
2. How much power is used if a force of 35 newtons is used to push a box a distance of 10 meters in 5 seconds?
ANSWER: 70W
3. What is the power if a kitchen blender if it can perform 3750 joules of work in 15 seconds?
ANSWER: 250W
4. How much work is done using a 500W microwave oven for 5 minutes?
ANSWER: 2500J
5. How much work is done using a 60W light bulb for 1 hour?
ANSWER: 216,000J
Determining Speed (Velocity)
Speed = Distance/Time Velocity = Distance/time
1. What is the velocity of a car that traveled a total of 75 kilometers north in 1.5 hours?
ANSWER: 50 km/hr
2. What is the velocity of a plane that traveled 3000 miles from New York to California in 5 hours?
ANSWER: 600 m/hr
3. John took 45 minutes to bicycle to his grandmother's house, a total of four kilometers. What was his velocity in km/hr?
ANSWER: 11.25 km/hr
4. It took 3.5 hours for a train to travel the distance between two cities at a velocity of 120 miles/hr. How many miles lie between the two cities?
ANSWER: 420 miles
5. How long would it take for a car tp travel a distance of 200 kilometers if it is travelingat a velocity of 55 km/hr?
ANSWER: 3.63 hour
6. A car traveling at 100 km/hr. How many hours will it take to cover a distance of 750 km?
ANSWER: 7.5 hours
7. A plane traveled for about 2.5 hours at a velocity of 1200 km/hr. What distance did it travel?
ANSWER: 300 km
8. A girl is pedaling her bicycle at a velocity of 0.10 km/min. How far will she travel in two hours?
ANSWER: .20 km
Force and Acceleration
Force = Mass x Acceleration
1. With what force will a car hit a tree if the car has a mass of 3000 kg and it is accelerating at a rate of 2 m/s^2
ANSWER: 6000N
2. A 10 kg bowling ball would require what force to accelerate it down an alleyway at a rate of 3 m/s^2
ANSWER: 30N
3. What is the mass of a falling rock if it hits the ground with a force of 147 newtons?
ANSWER: Help!
4. What is the acceleration of a softball if it has a mass of 0.50 kg and hits the catcher's glove with a force of 25 newtons?
ANSWER: 0.4 m/s
5. What is the mass of a truck if it is accelerating at a rate of 5 m/s^2 and hits a parked car with a froce of 14000 newtons?
ANSWER: 2800 kg
Heat and Phase Changes
For freezing and melting
Heat = (mass in grams) x (heat of fusion)
For boiling and condensation
Heat = (mass in grams) x (heat of vaporization)
The heat of fusion of water = 340 j/g
The heat of vaporization of water = 2300 j/g
1. How many joules of heat are necessary to melt 500 g of ice at its freezing point?
ANSWER: 170,000J
2. How many kilojoules is this?
ANSWER: HELP!
3. How much heat is necessary to vaporize 500 g of water at its boiling point?
ANSWER: 115,000J
4. If 5,100 joules of heat are given off when a sample of water freezes, what is the mass of the water?
ANSWER: 15g
5. If 57,500 joules of heat are given off when a sample of steam condenses, what is the mass of the steam?
ANSWER: 25g
Calculating Work
Work = Force x Distance
1. A book weighing 1 newton is lefted 2 meters. How much work was done?
ANSWER: 2J
2. A force of 15 newton is used to push a box along the floor a distance of 3 meters. How much work was done?
ANSWER: 45J
3. It took 50 Joules to push a chair 5 meters across the floor. With that force was the chair pushed?
ANSWER: 10N
4. A force of 100 newtons was necessaryto lift a rock. A total of 150 joules of work was done. How far was the rock lifted?
ANSWER: 1.5 meters
5. It took 500 newtons of force to push a car 4 meters. How much work was done?
ANSWER: 2000J
6. A young man exerted a force of 9000 newtons on a stalled car but was unable to move it. How much work was done?
ANSWER: No work was done there.
Potential and Kinetic Energy
Potential energy = weight x height
Kinetic Energy = 1/2 mass x velocity^2
1. What is the potential energy of a rock that weighs 100 newtons that is sitting on top of a hill 300 meters high?
ANSWER: 30,000J
2. What os the kinetic energy of a bicycle with a mass of 14 kg traveling at a velocity of 3 m/s?
ANSWER: 63J
3. A flower pot weighing 3 newtons is sitting on a windowsill 30 mets from the ground. Is the energy of the flower pot potential or kinetic? How much joules is this?
ANSWER: Potential, 90J
4. When the flower pot in problem 3 is only 10 meter from the ground, what is the potential energy?
ANSWER: 30J
5. How much of the total energy in problem 3 and 4 has been transformed to kinetic energy?
ANSWER: HELP!
6. A 1200 kg automobile is traveling at a velocity of 100 m/s. Is its energy potential or kinetic? How much energy does it possess?
ANSWER: Kinetic, 6,000,000J
Physical vs. Chemical Properties
1. Red color - Physical property
2. density - physical
3. flammability - physical
4. solubility - Chemical property
5. reacts with acid to from hydrogen - Chemical property
6. supports combustions - Chemical property
7. bitter taste - Phyiscal property
8. melting point - physical
9. reacts with water to form gas - Chemical Property
10. reacts with a base to form water - Chemical Property
11. hardness - Physical property
12. boiling point - physical property
13. can neutralize a base - chemical property
Phyiscal vs chemical change
1. Sodium hydroxide dissolves in water - Chemical
2. Hydrochloric acid reacts with sodium hydroxide to produce a salt, water, and heat - Chemical
3. A pellet of sodium is sliced in two - Physical
4. Water is heated and changed to steam - Physical
5. Potassium chlorate decomposes to potassium chloride and oxygen gas - Chemical
6. Iron rusts - Chemical
7. ice melts - physical
8. Acid on limestone produces carbon dioxide gas - chemical
9. milk sours - chemical
10. wood rots - physical
Substances vs. Mixture
1. sodium - S
2. water - S
3. Soil - M
4. Coffee - M
5. Oxygen - S
6. Alcohol - M
7. Carbon dioxide - S
8. Cake batter - M
9. Air - M
10. Soup - M
11. Iron - S
12. Salt water - M
13. ice cream - M
14. nitrogen - S
15. eggs - M
16. blood - M
17. table salt - S
18. nail polish - M
19. milk - M
20. Cola - M