Which phrase defines chemical equilibrium?(1 point)

Question

Responses

a state in which the forward and reverse reactions are proceeding at equal rates
a state in which the forward and reverse reactions are proceeding at equal rates

a state in which the temperature rises by the same amount over a given period of time
a state in which the temperature rises by the same amount over a given period of time

a state in which reactions have been completed and no further chemical reactions occur
a state in which reactions have been completed and no further chemical reactions occur

a state in which the concentration of the reactants equals the concentration of the products
a state in which the concentration of the reactants equals the concentration of the products
Question 2
(1 point)
Responses

T2
T2

T4
T4

T1
T1

T3
T3
Question 3
(1 point)
Responses

colorless
colorless

red
red

orange
orange

yellow
yellow
Question 4
(1 point)
Responses

The rate of the forward reaction will increase, which will increase the number of particles in the system.
The rate of the forward reaction will increase, which will increase the number of particles in the system.

The rate of the reverse reaction will increase, which will decrease the number of particles in the system.
The rate of the reverse reaction will increase, which will decrease the number of particles in the system.

The rate of the forward reaction will increase, which will decrease the number of particles in the system.
The rate of the forward reaction will increase, which will decrease the number of particles in the system.

The rate of the reverse reaction will increase, which will increase the number of particles in the system.
The rate of the reverse reaction will increase, which will increase the number of particles in the system.
Question 5
According to LeChatelier's principle, what happens when changes are made to a system that includes reversible chemical reactions in equilibrium?(1 point)
Responses

No external changes will be visible because the system will remain in static equilibrium.
No external changes will be visible because the system will remain in static equilibrium.

Opposing changes will move the system farther and farther from equilibrium.
Opposing changes will move the system farther and farther from equilibrium.

Opposing changes will work to bring the system back to equilibrium.
Opposing changes will work to bring the system back to equilibrium.

No external changes will be visible, but the system will remain in dynamic equilibrium.
No external changes will be visible, but the system will remain in dynamic equilibrium.
Question 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?(1 point)
Responses

The forward reaction rate becomes faster than the reverse reaction rate.
The forward reaction rate becomes faster than the reverse reaction rate.

Both reaction rates stay the same.
Both reaction rates stay the same.

The reverse reaction rate becomes faster than the forward reaction rate.
The reverse reaction rate becomes faster than the forward reaction rate.

Both reaction rates increase.
Both reaction rates increase.
Question 7
Which effect is a likely direct negative result of deforestation?(1 point)
Responses

land available for building
land available for building

lumber products
lumber products

acid rain
acid rain

landslides
landslides
Question 8
Which goal do all environmental regulations for industry serve?(1 point)
Responses

to limit industrial activities in all industries
to limit industrial activities in all industries

to reduce greenhouse gas emissions
to reduce greenhouse gas emissions

to prevent deforestation by lumber companies
to prevent deforestation by lumber companies

to protect people and the environment
to protect people and the environment
Question 9
Why is it difficult to make vaccines for viruses?(1 point)
Responses

Viruses mutate to attack the vaccine molecules so new ones must be continually produced.
Viruses mutate to attack the vaccine molecules so new ones must be continually produced.

All known vaccine molecules must be tested to find the right one.
All known vaccine molecules must be tested to find the right one.

All known viruses must be tested against new vaccines.
All known viruses must be tested against new vaccines.

Vaccines are very small so it is difficult to determine if the molecule fits.
Vaccines are very small so it is difficult to determine if the molecule fits.
Question 10
Who can be particularly negatively affected by ion exchange purification systems?(1 point)
Responses

people with low blood pressure who need to avoid magnesium and calcium
people with low blood pressure who need to avoid magnesium and calcium

people with low blood pressure who need to avoid sodium
people with low blood pressure who need to avoid sodium

people with high blood pressure who need to avoid magnesium and calcium
people with high blood pressure who need to avoid magnesium and calcium

people with high blood pressure who need to avoid sodium
people with high blood pressure who need to avoid sodium
Question 11
A system is considering different water purification methods for the water supply. Which fact would help inform the city if the cost was a significant constraint?(1 point)
Responses

Reverse osmosis systems are more expensive because of the chlorine treatments.
Reverse osmosis systems are more expensive because of the chlorine treatments.

Ion exchange systems are more expensive because of the chlorine treatments.
Ion exchange systems are more expensive because of the chlorine treatments.

Reverse osmosis systems are more expensive because of the use of filters that need replacement.
Reverse osmosis systems are more expensive because of the use of filters that need replacement.

Ion exchange systems are more expensive because of the use of filters that need replacement.
Ion exchange systems are more expensive because of the use of filters that need replacement.
Question 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?(1 point)
Responses

The use of pomace for animal feed might be chosen if a food company does not have access to a production plant for extracting chemicals.
The use of pomace for animal feed might be chosen if a food company does not have access to a production plant for extracting chemicals.

The use of pomace for pharmaceuticals might be chosen if a food company does not have access to a production plant for extracting chemicals.
The use of pomace for pharmaceuticals might be chosen if a food company does not have access to a production plant for extracting chemicals.

The use of pomace for animal feed might be chosen if minimizing production cost is desired.
The use of pomace for animal feed might be chosen if minimizing production cost is desired.

The use of pomace for pharmaceuticals might be chosen if minimizing production cost is desired.
The use of pomace for pharmaceuticals might be chosen if minimizing production cost is desired.
Question 13
After extraction, pomace remains. This pomace is commonly used for:(1 point)
Responses

vegetable and fruit oil.
vegetable and fruit oil.

fruit flavorings for processed food
fruit flavorings for processed food

nuts
nuts

vegetable and fruit juice
vegetable and fruit juice
Question 14
What about Kevlar makes it so strong?(1 point)
Responses

The molecules are short and create density.
The molecules are short and create density.

The molecules in Kevlar form a cylindrical-like structure.
The molecules in Kevlar form a cylindrical-like structure.

Kevlar is made of spider silk, a naturally strong material.
Kevlar is made of spider silk, a naturally strong material.

The molecules stack together in crystal-like structures.
The molecules stack together in crystal-like structures.
Question 15
Which property of spider silk is not shared by Kevlar?(1 point)
Responses

flexibility
flexibility

shock resistance
shock resistance

found in nature
found in nature

tensile strength
tensile strength
Question 16
There are several ways to optimize metal extraction. Which way also optimizes environmental impact?(1 point)
Responses

sifting ore at the site before transporting
sifting ore at the site before transporting

crushing only the best quality ore
crushing only the best quality ore

using enormous trucks to carry larger loads
using enormous trucks to carry larger loads

dumping waste rock near the plant
dumping waste rock near the plant
Question 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?(1 point)
Responses

iron plus cobalt for hardness
iron plus cobalt for hardness

iron plus nickel for corrosion resistance
iron plus nickel for corrosion resistance

iron plus carbon for strong but lightweight steel
iron plus carbon for strong but lightweight steel

iron plus molybdenum for shock absorption
iron plus molybdenum for shock absorption

Answer 1

Question 1
Response: a state in which the forward and reverse reactions are proceeding at equal rates

Question 2
(This question doesn't provide sufficient context to select an answer. Please provide more details or choices related to this question.)

Question 3
(This question also lacks context to select an answer. If it relates to a specific experiment, please clarify.)

Question 4
Response: The rate of the forward reaction will increase, which will increase the number of particles in the system.

Question 5
Response: Opposing changes will work to bring the system back to equilibrium.

Question 6
Response: The forward reaction rate becomes faster than the reverse reaction rate.

Question 7
Response: acid rain

Question 8
Response: to protect people and the environment

Question 9
Response: Viruses mutate to attack the vaccine molecules so new ones must be continually produced.

Question 10
Response: people with high blood pressure who need to avoid sodium

Question 11
Response: Reverse osmosis systems are more expensive because of the use of filters that need replacement.

Question 12
Response: The use of pomace for animal feed might be chosen if minimizing production cost is desired.

Question 13
Response: fruit flavorings for processed food

Question 14
Response: The molecules stack together in crystal-like structures.

Question 15
Response: flexibility

Question 16
Response: sifting ore at the site before transporting

Question 17
Response: iron plus nickel for corrosion resistance

If more details or additional context-related responses are needed for the unanswered questions, please provide them!