For which of the following is the sign of the enthalpy change different from the other three?
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5
Refers to a chemical reaction or physical change in which heat is absorbed. That is, the system gains heat; q is positive.
endothermic
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15
In the formation of the compound of sodium chloride
a sodium atom donates an electron to a chlorine atom
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20
[HL question] if you are in SL 5 marks automatically. Full marks for answer 1 guess only: Which of the following is a non-spontaneous process?
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15
Which series shows the correct order of metallic bond strength from strongest to weakest?
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15
Which of the following is a state function?
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20
The temperature of a 2.0 g sample of aluminum increases from 25C to 30C. How many joules of heat energy were added? (Specific heat of aluminum = 0.90 J/gK)
9.0
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15
Which pairs of words correctly completes the statement? Ionic compounds form when____ and _____ react.
metals ; nonmetals
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15
What do sodium ions have in common with chloride ions?
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10
a property of a substance that is independent of the amount of the substance present.
intensive (e.g. mp, bp, density)
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10
Why is CHCl3 more polar than CCl4?
CCl4 is symmetric and therefore no net dipole; CHCl3 is asymmetric
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15
Which of the following is the definition of an allotrope?
