Chemistry, 06.03.2020 19:04 ninjaerik4
Activation energy is necessary for a chemical reaction to occur because .
a. breaking bonds requires energy
b. some reactions happen at cold temperatures
c. alll reactions are endothermic
d. forming bonds requires energy
A chemical that keeps food spoiling is an example of .
a. a catalyst
b. an enzyme
c. a reactant
d. an inhibitor
Presence of a catalyst .
a. stops a reaction
b. raises the activation energy needed
c. slows down a reaction
d. reduces the activation energy needed
Answers: 3
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Phosphoric acid is a triprotic acid ( =6.9×10−3 , =6.2×10−8 , and =4.8×10−13 ). to find the ph of a buffer composed of h2po−4(aq) and hpo2−4(aq) , which p value should be used in the henderson–hasselbalch equation? p k a1 = 2.16 p k a2 = 7.21 p k a3 = 12.32 calculate the ph of a buffer solution obtained by dissolving 18.0 18.0 g of kh2po4(s) kh 2 po 4 ( s ) and 33.0 33.0 g of na2hpo4(s) na 2 hpo 4 ( s ) in water and then diluting to 1.00 l.
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Chemistry, 23.06.2019 00:00
Which is true about metals used for jewelry, such as platinum and gold? a. they have low flammability. b. they have low reactivity. c. they have high flammability. d. they have high reactivity.
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Activation energy is necessary for a chemical reaction to occur because .
a. breaking bon...
a. breaking bon...
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