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- 1. Multiple Choice
Which of the following is true about the formation of bonds between molecules?
Energy is given off when bonds are formed between molecules.
Energy is absorbed by the molecule when bonds are formed.
Energy is neither given off nor absorbed when bonds are formed.
- 2. Multiple Choice
Which of the following statement is true about the breaking of bonds between molecules?
To break a bond between molecules, energy must be released by the molecule
To break a bond between molecules, no energy is needed.
To break a bond between molecules, energy must be absorbed by the molecule.
- 3. Multiple ChoiceWhat is the activation energy?The energy of the productsThe energy of the reactantsThe minimum energy needed by the reactants to form the products.The energy lost in the reaction
- 4. Multiple ChoiceIf ∆H is negative, the reaction is?exothermicendothermic
- 5. Multiple ChoiceΔH value in an endothermic reaction is a positive number.TrueFalse
- 6. Multiple Choice
Endothermic reactions feel
warm
cold
- 7. Multiple Choice
Exothermic reactions feel
warm
cold
- 8. Multiple Choice
Which example would be considered exothermic?
Melting Ice
Photosynthesis
Making ice cubes
Cooking an egg
- 9. Multiple Choice
In an exothermic reaction, heat is ...taken in or absorbedgiven out or released - 10. Multiple ChoiceIn an endothermic reaction, heat is ...taken in or absorbedgiven out or released
- 11. Multiple Choice
What type of reaction is this?
Exothermic
Endothermic
Energy Producing
No way to tell
- 12. Multiple Choice
The graph above is from which type of reaction?
Endothermic reaction
Exothermic reaction
- 13. Multiple Choice
In an exothermic reaction,
bond forming of products = bond breaking of reactants
bond forming of products > bond breaking of reactants
bond forming only
bond breaking of reactants > bond forming of products
- 14. Multiple Choice
In an endothermic reaction,
bond breaking of reactants = bond forming of products
bond breaking of reactants > bond forming of products
bond forming of products > bond breaking of reactants
bond breaking only
- 15. Multiple Choice
Pick all the examples of exothermic reaction.
Freezing
Respiration
Melting
Combustion of fuel
- 16. Multiple Choice
Pick all the examples of endothermic reaction.
Photosynthesis
Melting
Thermal decomposition of carbonate salt
combustion of fossil fuels
- 17. Multiple Choice
Uranium undergoes ______ to release heat energy.
nuclear fission
nuclear fussion
redox reaction
combustion
- 18. Multiple Choice
Fuel cell uses ______ and oxygen gas to produce electrical energy.
hydrogen
platinum
nitrogen
methane
- 19. Multiple Choice
Hydrogen bus uses hydrogen as fuel. It is known as a clean fuel, why?
it doesn't release any harmful gas.
It doesn't cause leakage.
It is cheap.
It gives out water.
- 20. Multiple Choice
The energy level diagram for the reaction between sodium hydrogen carbonate and dilute hydrochloric acid is shown.
Which correctly describes the type of reaction and the energy of the reactants and products?
endothermic
exothermic
the products have more energy than the reactants
the reactants have more energy than the products
- 21. Multiple Choice
The energy level diagram for the reaction between magnesium and hydrochloric acid is shown.
Which statement about the reaction is not correct?
Energy is given out during the reaction.
The products are at a lower energy level than the reactants
The reaction is endothermic
The temperature increases during the reaction
- 22. Multiple Choice
A metal reacts with an aqueous solution.
The graph shows the temperature before, during and after the reaction.
Which correctly describe the reaction?
Displacement reaction
Thermal decomposition
Exothermic
Endothermic
- 23. Multiple Choice
The diagram show four chemical reactions.
Which reaction is endothermic?
- 24. Multiple Choice
Which statements about exothermic and endothermic reactions are correct?
During an exothermic reaction, heat is given out.
The temperature of an endothermic reaction goes up because heat is taken in.
Burning methane in the air is an exothermic reaction.
- 25. Multiple Choice
Some white anhydrous copper (II) sulfate powder is put into a beaker of water and stirred.
What would show that the process was exothermic?
A blue solution is formed.
The beaker feels cooler.
The beaker feels warmer.
The powder dissolves in the water.
- 26. Multiple Choice
The diagrams show some pieces of laboratory equipment.
Which equipment is needed to find out whether dissolving salt in water in an endothermic process?
- 27. Multiple Choice
Which diagram shows a process in which an endothermic change is taking place?
- 28. Multiple Choice
By striking the match, a chemical reaction takes place.
Which statements about the chemical reaction are correct?
endothermic
exothermic
because energy is used to strike the match
because energy is given out as the match burns
- 29. Multiple Choice
The diagram shows some properties that substances may have.
To which labelled part of the diagram does 235U belong?
A
B
C
D
- 30. Multiple Choice
The elements hydrogen and uranium are used as fuels.
The compound ethanol is also used as a fuel.
Which fuels require oxygen in order to produce heat energy?
hydrogen
uranium
ethanol
- 31. Multiple Choice
Substance X requires oxygen in order to produce energy.
It does not form carbon dioxide as a result of this energy production.
What is substance X?
hydrogen
natural gas
petrol
235U
- 32. Multiple Choice
Which substance could not be used as a fuel to heat water in a boiler?
ethanol
hydrogen
methane
oxygen
- 33. Multiple Choice
Power stations produce electrical energy from different fuels.
Which fuel causes least pollution to the atmosphere?
coal
fuel oil
natural gas
radioactive isotopes
- 34. Multiple Choice
What is the main reason why hydrogen is more difficult to store than diesel?
Hydrogen is a gas at room temperature but diesel is a liquid
Hydrogen can be liquefied by cooling it
Hydrogen can be stored under pressure
- 35. Multiple ChoiceWhich of these is a disadvantage of hydrogen fuel cellsproduces pollutionexpensive and flammableheavy and weaklarge and unattractive
- Answer choicesTagsAnswer choicesTags