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6.6B - Density
6.7A - Energy Sources
6.9C - Energy Transformation
100
A balance and a graduated cylinder are used to determine the density of a mineral sample. The sample has a mass of 14.7 g and a volume of 2.2 cm3. What is the density of the mineral sample?
6.7 g/cm³
100
Wind turbines are used as an alternative source of energy. They use wind currents to generate electricity. Energy can be harnessed from the wind because moving air has what type of energy?
Kinetic energy
100
Windmills are used to convert wind energy into a more useful form. In most cases, there are three steps in this process. The energy is in a different form at eat step. Which of the following flowcharts shows the most likely order of the energy changes? A. wind energy > mechanical energy > solar energy B. wind energy > thermal energy > mechanical energy C. wind energy > solar energy > electrical energy D. wind energy > mechanical energy > electrical energy
D. Wind energy > mechanical energy > electrical energy
200
The density of a sample of an unknown substance has a volume of 5 cm³ and a mass of 20 grams. What is it's density?
4 g/cm³
200
Striking a match, combining vinegar and baking soda to form CO2 gas, digesting food, and breaking light glow stick are all examples of what type of energy? A. Chemical Energy B. Light Energy C. Heat Energy D. Mechanical Energy
A. Chemical Energy
200
Hot air balloon rise when propane gas is lit at the bottom of the balloon. What energy transformations occur when propane gas is used to lift the balloon? A Mechanical > light > chemical
 B Chemical > mechanical > thermal C Thermal > chemical > light
 D Chemical > thermal > mechanical
D. Chemical > Thermal > Mechanical
300
A rock with a mass of 70 grams is dropped into a graduated cylinder with 30 mL of water in it. The water level rose to 35mL Calculate the density of the rock in g/mL.
14 g/mL
300
Which of these resources will most likely be depleted first? A. Solar Energy from a solar panel B. Wind Energy from a wind mill C. Fossil fuels D. Water from Hydro electric power plant
C. Fossil Fuels
300
Flashlights get their power from batteries. Which of the following transformations, or changes take place in a battery? A. Electrical energy is transformed into mechanical energy and heat energy. B. Chemical energy is transformed into electrical energy and heat energy. C. Mechanical energy is transformed into heat energy. D. Heat energy is transformed into chemical energy.
B. Chemical energy is transformed into electrical energy and heat energy.
400
Two different bars of chocolate are being investigated by a group of students. They measured the mass and volume of each chocolate bar and recorded the results in the table below: Bar Mass (g) Volume (cm³) A 110 100 B 95 100 Density of water = 1.0 g/cm³ Calculate the density of each bar of soap.
Bar A is 1.10 g/cm³ Bar B is .95 g/cm³
400
In a nuclear power plant, the element uranium splits atoms in a process called fission. This process releases a large amount of energy. In order to provide the energy to factories and homes, the power plant needs to convert it into …..
Electricity
400
The following equation represent the process of photosynthesis in a plant. Light 6CO2 + 6H2O > C6H12O6 +6O2 Chlorophyll (Carbon Dioxide + Water, int he presence of light and Chlorophyl > Sugar and Oxygen What happens to most of the light energy during photosynthesis? A. It is transformed into heat energy. B. It is transformed into chemical energy. C. It is transformed into light energy. D. It is transformed into mechanical energy.
B. It is transformed into chemical energy.
500
The mass of a 125 cm³ piece of material is 82.75 g. Determine the density of this material
0.662 g/cm³
500
The US consumes a lot of petroleum and natural gas. It is important to develop alternative sources of energy because petroleum and natural gas… A. Both will eventually used up all the oxygen needed for human survival B. Both are being spilled into the ocean faster than they are being used C. Both fail to store solar energy and both contain limited chemical energy D. Both are nonrenewable resources that are a limited source of energy that are almost impossible to renew.
D. It is nonrenewable resource that is a limited source of energy that is almost impossible to renew.
500
A lamp that plugs into a wall socket draws energy which flows through a thin wire in the bulb causing it to glow. What energy transformations are taking place? A. Chemical → Light → Electrical B. Mechanical → Sound → Light C. Thermal → Solar → Electrical D. Electrical → Thermal → Light
D. Electrical → Thermal → Light