WorksheetsEnergy Flow Exam # 5- Study Guide
Total questions: 21
Worksheet time: 11mins
Photosynthesis is a process in which plants use energy from the sun to make oxygen and glucose, as shown below.
Which of the following statements is TRUE about photosynthesis?
It is an endothermic reaction.
It is an exothermic reaction.
It is both endothermic and exothermic reaction.
More information is needed.
When propane and oxygen react, they go through combustion.
Combustion is what type of reaction?
endothermic
exothermic
nuclear
none of the above
The picture shows a winter blanket.
Why does the winter blanket keep you warm from the cold air?
It increases the amount of thermal energy produced by your body.
It increases the transfer of thermal energy from the air to your body.
It produces thermal energy and adds to your body heat.
It slows the transfer of thermal energy from your body into the air.
In the picture, why is heat felt from the campfire without touching it?
Heat is conducted by air particles.
Heat is conducted by particles in the wood.
Heat radiates through the air.
Heat transfers through convection currents.
What is the Law of Conservation of Energy?
Energy cannot be created or destroyed, but it can only be transformed or transferred from one form to another.
Energy can be created or destroyed, but it cannot be transformed from one form to another.
Energy cannot be transferred from one object to another object.
Energy can be created or destroyed.
Which of the following best explains why the reaction in the diagram is exothermic?
energy is not conserved
energy of the reactants is less than energy of the products
energy of the reactants is more than energy of the products
more heat is absorbed
A test tube containing a piece of wax is warmed in an oil bath until the wax melts. The test tube is removed from the bath and is allowed to cool until the wax freezes. Which of the following statements best describes the first law of thermodynamics as applied to this change?
The total energy lost by the wax and test tube is equal to the total energy absorbed by the surroundings.
The total energy lost by the wax and test tube is equal to the total energy absorbed by the system.
Thermal energy flows from the wax and test tube to the surroundings, but not in the reverse direction.
Thermal energy flows from the wax and test tube to the system, but not in the reverse direction.
A change occurs that raises the temperature of the container in which it happens. What is the best term to describe the change?
chemical
endothermic
exothermic
physical
Thermal energy would naturally flow between objects at which temperatures?
*Note: the numbers may change for the exam
from 15°C to 15°C
from –15°C to 100°C
from 0°C to 45°C
from 100°C to 5°C
How does an exothermic reaction compare with an endothermic reaction?
An endothermic reaction absorbs energy, and an exothermic reaction releases energy.
An exothermic reaction absorbs energy, and an endothermic reaction releases energy.
Both changes absorb energy as reactants become products.
Both changes release energy as reactants become products.
Which statement best describes the relationship between the system and the surroundings?
The system is found around the surroundings and includes the surroundings.
The system is found around the surroundings but does not include the surroundings.
The system is found in the surroundings and is part of the surroundings.
The system is found in the surroundings but is not included as part of the surroundings.
Which statement best describes the interaction of the surroundings with a substance that is freezing?
The surroundings are cooler than the substance and absorb thermal energy from it.
The surroundings are cooler than the substance transfer thermal energy into it.
The surroundings are warmer than the substance and absorb thermal energy from it.
The surroundings are warmer than the substance and transfer thermal energy into it.
Calcium carbonate breaks down into calcium oxide and carbon dioxide when heated. The decomposition of calcium carbonate is an example of what type of change?
an endothermic chemical change
an endothermic physical change
an exothermic chemical change
an exothermic physical change
In the flashlight above, which of the following best describes how energy is transformed in the flashlight?
chemical → electrical → light
light → mechanical → chemical
mechanical → thermal → chemical
thermal → chemical → light
Which of the following best describes how energy is transformed when you rub your hands together?
kinetic energy into potential energy
kinetic energy into thermal energy
thermal energy into kinetic energy
thermal energy into potential energy
Which of the following best describe the flow of heat?
Heat does not flow anywhere.
Heat flows from a cold object to a hot object.
Heat flows from a hot object to a cold object.
Heat maintains its energy at a cold object.
A hot piece of metal is placed into cooler water. Which statement describes how the second law of thermodynamics relates to this process?
Energy flows from the metal to the water until they are at the same temperature.
Energy flows from the water to the metal until they are at the same temperature.
The amount of energy lost by the metal is equal to the amount of energy gained by the water.
The temperature change of the metal is equal to the temperature change of the water.
What type of energy is in a hamburger?
kinetic energy
chemical energy
mechanical energy
nuclear energy
In this reaction, energy (as heat) appears as a _________ (reactant/product).
reactant
product
The reaction __________ (absorbs/releases) energy from its system out to the surroundings, making the surroundings ___________ (colder/hotter).
absorbs, colder
absorbs, hotter
releases, colder
releases, hotter
This reaction is ___________ (endothermic/exothermic).
endothermic
exothermic
