Which of the following statements best defines chemical equilibrium?
a state in which the concentration of the reactants equals the concentration of the products
a state in which the forward and reverse reactions are proceeding at equal rates
a state in which reactions have been completed and no further chemical reactions occur
a state in which the temperature rises by the same amount over a given period of time
2) T3
3) orange
4) The rate of reverse reaction will increase which will increase the number of particles in the system
5) Opposing changes will work to bring the system back to equilibrium
6) The forward reaction rate becomes faster than the reverse reaction rate
7) landslides
8) to protect people and the environment
9) all known vaccine molecules must be tested to find the right one
10) people with high blood pressure who need to avoid sodium
11) reverse osmosis systems are more expensive because of the use of filters that need replacement
12) the use of pomace for animal feed might be chosen if minimizing production cost is desired
13) fruit flavorings
14) strong chains of molecules and intermolecular forces between layers
15) biodegradability
16) sifting ore at the site before transporting
17) iron plus nickel for corrosion resistance
Alternatively
8.acid rain
12.fruit flavorings
13.less waste and more valuable products
14. The molecules stack together in crystal like structures
17.Impurities change the molecular structure of alloy, which can increase its strength and hardness
— (paraphrased ofc)
18.basic water holds OH- ions so NaOH will be formed and the solution will move right
Sports drink have electrolytes which include more Na+ And the formation of salt crystals, the solution will then proceed left
19.NaOH is a base so it'll move to the left, changing the color to yellow
20.Metals are highly conductive so electricity passes with little trouble; very ductile so they can be manufactured into wire without the threat of snapping; also malleable
Honestly you both have helped me so much and I cannot express my gratitude in a way that can convey its magnitude to you but I want you guys to know that y'all are great.
A state in which the forward and reverse reactions are proceeding at equal rates.
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Thanks, Pancakes, and Regal! Such lifesavers!
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Question with 10% correct answers
1 :Which phrase defines chemical equilibrium?
ANSWER: a state in which the forward and reverse reactions are proceeding at equal rates
2:Use the table of data for a decomposition reaction to answer the question.
Concentration (C) at T1 (g/L) C at T2 (g/L) C at T3 (g/L) C at T4 (g/L)
Reactant 300 100 50 50
Product 1 0 100 125 125
Product 2 0 100 125 125
In a decomposition reaction, a reactant breaks down to form two products. At which time did the system first reach chemical equilibrium?
ANSWER: T3
3: Use the dissociation reaction to answer the question.
FeSCN2+(aq) ⇄ Fe3+(aq) + SCN–(aq)
In the reaction, FeSCN2+ ions are red, Fe3+ ions are pale yellow, and SCN– ions are colorless.
A solution at equilibrium is yellow-orange. The concentration of SCN– ions is increased by a moderate amount. Which color will the solution most likely become?
ANSWER: orange
4: Use the reaction to answer the question.
N2O4(g) + energy ⇄ 2NO2(g)
The system is at equilibrium, but then it is subjected to an increase in pressure. Which change will happen?
ANSWER: The rate of the reverse reaction will increase, which will decrease the number of particles in the system.
5: According to Le Chatelier’s principle, what happens when changes are made to a system that includes reversible chemical reactions in equilibrium?
ANSWER: Opposing changes will work to bring the system back to equilibrium.
6: A system is at equilibrium. Which statement correctly describes the effect on the forward and reverse reaction rates if reactants are added to the system?
ANSWER: The forward reaction rate becomes faster than the reverse reaction rate.
7:Which effect is a likely direct negative result of deforestation?
ANSWER: landslides
8: Which goal do all environmental regulations for industry serve?
ANSWER: to protect people and the environment
9: Why is it difficult to make vaccines for viruses?
ANSWER: All known vaccine molecules must be tested to find the right one.
10: Who can be particularly negatively affected by ion exchange water purification systems?
ANSWER: people with high blood pressure who need to avoid sodium
11: A city is considering different water purification methods for the water supply. Which fact would help inform the city if cost was a significant constraint?
ANSWER: Reverse osmosis systems are more expensive because of the use of filters that need replacement.
12: Criteria and constraints help determine which solutions will be applied when extracting materials from pomace. In which way might a specific criterion be applied to this situation?
ANSWER: The use of pomace for animal feed might be chosen if minimizing production costs is desired.
13: Which substance would one hope to extract from pomace?
ANSWER: fruit flavorings
14: What about Kevlar makes it so strong?
ANSWER: The molecules stack together in crystal-like structures.
15:Which property of spider silk is not shared by Kevlar?
ANSWER: biodegradability
16: There are several ways to optimize metal extraction. Which way also optimizes environmental impact?
ANSWER: sifting ore at the site before transporting
17: An engineer is tasked with building a new structure in Seattle that can withstand frequent rainy weather. Which alloy is the best choice for building this structure?
ANSWER: iron plus nickel for corrosion resistance
Short answer questions though they arent graded yet
and i got them from other websites so use at your own risk
18: Use the equation of sodium chloride dissolving in water to complete the activity.
NaCl(s) ⇄ Na+(aq) + Cl–(aq)
A student is testing two clear liquids. One liquid is water that has been modified to have a basic pH. The other liquid is a sports drink that contains added electrolytes, including Na+(aq). How can the student use the equilibrium reaction of sodium chloride to determine which liquid is which? In three to five sentences, explain your answer.
ANSWER:If we add the sports drink and basic water to the "NaCl" solution, then the electrolytes will go left because we're adding more "Na+" and creating salt crystals. If we add basic water (which has "OH- ions"), it will go right because it uses "Na+" to form "NaOH."
19: Chromate ions react according to the following equation, where the left side of the reaction is yellow and the right side is orange.
CrO42– + 2H+ ⇄ Cr2O72– + H2O
A student adds sodium hydroxide (NaOH) to the solution at equilibrium. In one to two sentences, describe and explain any changes to the solution that the student will observe.
ANSWER:In the given equation, addition of acid will result in the forward reaction proceeding and the solution turns orange.
20: The left reaction is favoured on addition of base.
Since NaOH is a base, addition of NaOH will cause the left reaction to proceed.
The solution turns yellow
In one to two sentences, explain why metal is often used for making wire and the properties that make metal useful.
ANSWER: Metal is used in the making of wire because of its high conductivity. Metals are also ductile, so the making of wire is easy with metal