EXAM QUESTIONS AND
ANSWERS | LATEST UPDATE
what is Avogadro's number - ANSWER ✔✔6.022 x 10²³
what is evidence of a chemical reaction - ANSWER ✔✔color change
the evolution of gas (bubbles)
formation of a solid
a noticeable smell
heat being produced/absorbed
the emission of light
,what is oxidation - ANSWER ✔✔the gain of oxygen/loss of hydrogen
the loss of electrons
what is reduction - ANSWER ✔✔the loss of oxygen/gain of hydrogen
the gain of electrons
what is a combustion reaction - ANSWER ✔✔type of oxygen-
reduction reaction in which one of the reactants is elemental oxygen and
it produces carbon dioxide and water as the products
when are CO2 and H2O produced - ANSWER ✔✔when the other
reactant in a reaction with elemental oxygen is an organic compound
(combustion)
how many cal in a kcal - ANSWER ✔✔1,000
how many nutritional calories (C) in a kcal - ANSWER ✔✔1
how many joules in 1 cal - ANSWER ✔✔4.184
what is an exothermic reaction - ANSWER ✔✔- releases energy
- the reactants have a higher potential energy than the products
meaning the reactants are less stable
- the change in H is negative
, what is an endothermic reaction - ANSWER ✔✔- absorbs energy
- the products have a higher potential energy than the reactants, making
the products less stable
- the change in H is positive
what factors affect the rate of reaction - ANSWER ✔✔1. the
concentration of the reactants
2. the temperature
3. whether or not a catalyst is present
is breaking a bond exothermic or endothermic - ANSWER
✔✔endothermic
is forming a bond exothermic or endothermic - ANSWER
✔✔exothermic
what is the change of enthalpy of the reaction - ANSWER ✔✔change
in H of the reaction = energy of products - energy of reactants
what are catabolic pathways - ANSWER ✔✔energy is released
what are anabolic pathways - ANSWER ✔✔energy is absorbed
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