WorksheetsEnergy Concepts
Total questions: 10
Worksheet time: 5mins
Identify the error in this reaction profile
the wrong colours have been used
the activation energy is too large
the arrows are double-headed
the reactants have more energy than the products
What kind of reaction is represented by this profile?
endothermic reaction
exothermic reaction
decomposition reaction
acid + hydrogencarbonate
In an exothermic reaction, the energy change is...
negative showing excess energy is released
positive showing excess energy is released
negative showing energy is absorbed
positive showing energy is absorbed
The reaction represented by this reaction profile is...
exothermic
endothermic
metal + acid
combustion
The energy change in an endothermic reaction is...
positive and absorbs energy from the surroundings
negative and excess energy is released to the surroundings
positive and excess energy is released to the surroundings
negative and absorbs energy from the surroundings
The amount of energy in the universe at the end of a chemical reaction is...
the same as before the reaction happened
greater than before the reaction
less than before the reaction
transformed into heat and light
What is ACTIVATION ENERGY?
the energy needed for particles to collide
the energy needed to start a chemical reaction
the minimum amount of energy that particles must have to react
the difference between the energy of the reactants and products
When chemical bonds are broken...
energy must be absorbed
energy is released
energy is conserved
energy is used up
When a fuel burns...
excess energy is released to the surroundings
energy is released from the flame
energy stored in the fuel is released
Pick all of the correct answers:
Hydrogen forms a covalent bond with chlorine because...
both atoms are unstable
hydrogen is more reactive than chlorine
they want to form a stable outer shell arrangement
the hydrogen chloride molecule is more stable
