Which is the best definition of activation energy? 1 point the energy required to end a chemical reaction the energy required to re-form the bonds the energy required to break the the bonds of the reactant molecule the energy required to produce the molecule
Which is the best definition of activation energy? 1 point the energy required to end a chemical reaction the energy required to re-form the bonds the energy required to break the the bonds of the reactant molecule the energy required to produce the molecule
Which is the best definition of activation energy? 1 point the energy required to end a chemical reaction the energy required to re-form the bonds the energy required to break the the bonds of the reactant molecule the energy required to produce the molecule
Which is the best definition of activation energy?
1 point
the energy required to end a chemical reaction
the energy required to re-form the bonds
the energy required to break the the bonds of the reactant molecule
the energy required to produce the molecule
2. Which statement correctly described a chemical reaction?
1 point
energy is always released
reactants come out in the reaction
products go to the reaction
bonds between atom breaks and new bonds are form
3. Which of the following is an exothermic reaction?
1 point
a reaction that required an activation energy
a reaction that involved change in energy
a reaction that absorbed energy from the environment
a reaction that released an energy in the surrounding
4. Photosynthesis is an example of
1 point
an exothermic reaction.
a reaction that emits energy.
an endothermic reaction.
a reaction that gives of heat.
5. Which of the following is a third-order chemical reaction?
1 point
2 NO +Cl2 ⇢ 2 NOCl
2 NO + O2 ⇢ 2 NO2
O + NO + N2 ⇢ NO2 + N2
all of the above
Other:
6. What catalysts are in a different phase ?
1 point
homogeneous
heterogeneous
both
none of the above
7. One of the assumption of the Collision theory is that the particles must have enough energy, speed, to break the bonds and form new bonds, when they collide, this is _____ .
1 point
true
false
8. In an exothermic reaction ________ .
1 point
the potential energy of the product is lower compared to potential energy of the reactant.
the potential energy of the product is greater compared to potential energy of the reactant.
the potential energy of the product and the reactant are the same
the potential energy of the product and the reactant sometimes high and sometimes low
9. Are both Heterogenous and Homogenous used up in the chemical reaction reactions?
1 point
yes
no
heterogenous only
homogeneous only
10. By application of catalyst, the activation energy for the new pathway is less than the activation energy of the normal pathway more molecules are able to take part in an effective collisions, this is ______ .
1 point
true
false
11. An entropy which shows that there is an increase in randomness and disorder.
1 point
positive
negative
neutral
none of the above
12. Which of the following is an spontaneous reaction ?
1 point
fireworks
photosynthesis
housefire
ice melting at room temperature of 10 deg Celsius
13. Which statement best described how catalyst can speed up a chemical reaction ?
1 point
the catalyst bind the molecule of reactant and the product
the catalyst lower the energy pathway available
the catalyst increase the reaction of the product
the catalyst increase the concentration of the reactants
Option 5
14. What are the two driving force for all chemical reaction? the enthalpy and the entropy.
1 point
activation energy and potential energy
activation energy and entropy
activation energy and enthalpy
entropy and enthalpy
15. What type of molecularity is applied in the given chemical equation : NO + O3 ⇢ NO2 + O2 ?
1 point
unimolecular
bimolecular
trimulecular
can not be identified?
16. How do catalysts work?
1 point
make more reactants
increase the enthalpy
lower the activation energy
increase the activation energy
17. The process of speeding up a reaction by using a catalyst is known as catalysis.
1 point
catalyctic
catalism
catalysis
none of the above
18. Which component is affected when a catalyst is added to a chemical reaction?
1 point
the amount of product
the amount of reactant
the activation energy
enthalpy
19. It is a chemical reactions that occurs even without being driven by outside force or heat.
1 point
nonspontaneous
spontaneous
reversible
irreversible
20. If the activation energy required for for a chemical reaction were reduced, what would happen to the rate of reaction?
1 point
the rate would increase
the rate would decrease
the rate would go up and down
the rate would remain the same
Definition Definition Study of the speed of chemical reactions and other factors that affect the rate of reaction. It also extends toward the mechanism involved in the reaction.
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