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15
×
The bonding and structure in the element helium is ....
monatomic
covalent molecular
covalent network
metallic
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15
×
An increase in temperature ....
increases the activation energy
increases the energy released in a reaction
increases the average kinetic energy of the reactants
lowers the activation energy
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15
×
The activation energy for a reverse reaction is calculated from.....
the difference between the product and highest peak energy
the difference between the reactant and highest peak energy
the energy of the highest peak
the difference between the reactant and product energy
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15
×
Which of the following is incorrect about the activation energy
it is the energy required to form the activated complex
it is the minimum kinetic energy needed to start a reaction
it can sometimes be negative
it is lowered by the addition of a catalyst
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15
×
When reactants lose energy to form products, which of the following must be true?
the reaction is endothermic
the activation energy is high
the activation energy is very low
the reaction is exothermic
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15
×
The bonding and structure in the element tin is ....
monatomic
covalent network
covalent molecular
metallic
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15
×
Exothermic reactions ...
always have a - enthalpy change
are not reversible
are always reversible
always have a + enthalpy change
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15
×
The melting point of group 0 elements increases down the group. This is because...
The atoms become less reactive
The atoms weigh more
Temporary dipoles increase in strength
Hydrogen bond increases
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15
×
Which of these forces are weakest?
ionic bond
Permanent dipole - permanent dipole
London dispersion
hydrogen bond
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heart
Other team wins 20 points!
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fairy
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25
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fairy
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25
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thief
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25
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eraser
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gift
Win 15 points!
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gift
Win 25 points!
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banana
Go to last place!
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15
×
Which of the following molecules are polar?
CF<sub>4</sub>
CO<sub>2</sub>
NH<sub>3</sub>
CH<sub>4</sub>
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15
×
An increase in which of the following will have the largest impact on reaction rate?
pressure
concentration
surface area
temperature
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thief
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25
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magnet
Take 25 points!
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gift
Win 25 points!
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lifesaver
Give 25 points!
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15
×
The bonding and structure in the element carbon (as graphite) is ....
covalent molecular
covalent network
monatomic
metallic
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15
×
A chemical reaction had a relative rate of 0.25 min-1. How long did the reaction take to end?
0.25 mins
25 mins
40 mins
4 mins
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