Which statement best describes the use of a catalyst in a fuel cell? It reduces waste. It lowers energy requirements. It reduces toxic exhaust. It increases reaction rates.
Answers
The statement that best describes the use of a catalyst in a fuel cell is : ( D ) It increases reaction rate
A catalyst in a fuel cell speeds up/facilitates the rate of reaction of oxygen and hydrogen especially at the oxygen electrode of the fuel cell.
Generally catalyst is any substance that increases the rate of a chemical reaction without been used up in the process, while lowering the activation energy required to kickoff the reaction.
Hence we can conclude that the statement that best describes the use of a catalyst is that it increases the reaction rate
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Answer:
The answer is D
Explanation:
EDGE2022
Related Questions
Plants using the CAM pathway occur in many locations but are most common in very arid locations, such as deserts. What deserts occur in North America and where are these deserts located?
Answers
The desert that occurs in North America is the Great Basin Desert and it is located at Nevada of North America.
CAM pathway, which is also called Crassulacean Acid Metabolism, is a pathway that involves carbon fixation that occurs in plants growing in arid areas.
With this pathway these plants are able to photosynthesize during the day, but only exchange gases at night.
An arid habitat is an environment that is characterized by extreme lack of water, example is the desert.
In North America, the desert that occurs there is the Great Basin Desert. It spreads into different states which include:
NevadaWestern Utah, Eastern California, andIdaho.But the major part of Nevada is occupied by the Great Basin Desert.
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what is the cell wall function and factory part or worker?
Answers
Answer:
Major cell parts function just like the structures and people who work together in a factory. Cells have strong cell walls and a cytoskeleton to keep their shape; the walls are made of fiber for protection just like a factory building has sturdy walls for support.
The cell wall serves as a protective and structural layer surrounding plant, fungal, and bacterial cells. It provides rigidity, support, and defense against external pressures and pathogens.
In various species, the cell wall serves as a robust outer layer. Its primary component in plants is cellulose, which helps to preserve cell structure, limit excessive water absorption, and promote growth. Chitin is found in the cell wall of fungi, providing both structural integrity and protection.
Bacteria have a variety of cell wall compositions; peptidoglycan, for example, is an essential part of many bacterial cell walls. Along with other cellular components, this "factory-like" part of the cell performs its functions. It is comparable to a factory's base, supporting the cell's framework, and worker, guarding against threats and preserving the cell's overall operation.
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11. Approximately how much of Earth's fresh water is trapped in glacial ice?
O A. 70 percent
OB. 10 percent
O C.30 percent
O D. 90 percent
Answers
Answer:
A. 70 percent
The diagram below represents a plant cell in tap water as seen with a compound light microscope.
Which diagram best represents the appearance of the cell after it has been placed in a 15% solution for two
minutes?
SOS
(1)
(2)
(3)
(4)
Answers
Answer:
(3)
Explanation:
I believe 3 would be the answer here because when interacting with a salt solution, plant cells will look like that. Hope this helped!
Diagram 3 of the cell will represents cell's appearance after being kept in 15% salt solution.
This will happen because of exosmosis in which the water will move out of the cell causing to to get shrink called plasmolysisWhat is osmosis?It is the process of movement of solvents through a semi- permeable membrane from region of lower solute concentration to higher solute concentration.
There are three types of osmosis:-
Isotonic:- The solutions bring compared have equal concentration of solutesHypotonic:- The solution with lower concentration of solutesHypertonic:- The solution with higher concentration of solutesTo know more about osmosis here
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mitosis is the only type of cellular division in which:
Answers
Answer:
itosis is a process where a single cell divides into two identical daughter cells.
Explanation:
Mitosis is the only type of cellular division in which number of chromosomes is maintained
What is mitosis?During the phase of the cell cycle known as mitosis, duplicated chromosomes are physically split in half to form two new nuclei. Mitosis is a method of cell division that results in the production of cells that are genetically similar and in which the total number of chromosomes is preserved. Since this occurs during mitosis, the process is often referred to as equational division.
Mitosis serves a very vital purpose in living creatures, and one of its functions is the regeneration and replacement of worn-out and damaged tissues. Mitosis contributes to the generation of identical copies of cells and, as a result, assists in the process of healing damaged tissue or replacing cells that have been worn out.
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manilla and linen are derived from which plants, respectively
Answers
Answer:
flax is a stem fiber that is used to make linen. a smooth shiny fabric made from flax
26.
Which of the following food chains
shows one way that energy moves
through an ocean ecosystem?
A fish plankton + whale → squid
B squid whale fish plankton
C plankton squid fish whale
D whale fish plankton → squid
Answers
Answer:
C
Explanation:
ans is C Wait a minute, I'll be right back.
how does carbon moves through the system in the dark?
Answers
Answer:
Generally, about half of the caught carbon is released in respiration. ... When it is dark, the only flow of CO2 comes from respiration.
Explanation:
What are some characteristics of animals in “class”
Please help this is for a project pls help it will mean so much for me
Answers
Animals can be classified according to different physical characteristics, such as body covering (e.g., hair, fur, feathers, scales, shells), body shape (e.g., two main features, three main features), appendages (e.g., arms, legs, wings, fins, tails), and method of movement (e.g., walking, crawling, flying, swimming).
addition of large amounts of salt to soil in which plants are growing kills the plants. explain
Answers
Which of the following includes organisms that can use energy from the sun to make food?
Answers
Answer:
Explanation:
An autotroph is an organism that can produce its own food using light, water, carbon dioxide, or other chemicals. Because autotrophs produce their own food, they are sometimes called producers. Plants are the most familiar type of autotroph, but there are many different kinds of autotrophic organisms.
PLEASE HELP!!
Gastric secretion would include all of these except
A. pepsinogen
D. mucous
E. gastrin
C. CCK
B. HCl
Answers
Answer:
C. CCK
Explanation:
Gastric juice contains pepsinogen, HCl, mucus, rennin, and gastrin hormone.
Cholecystokinin (CCK) is secreted by I-cells of duodenum.
what is the difference in solubility of triglyceride and the products of their hydrolysis
Answers
Answer: Triacylglycerols are the major constituents of oils and fats of both plant and animal origin.
Explanation:
Hope this helps.
The products of hydrolysis of triglycerides are fatty acids and glycerol. While fatty acids, like triglycerides, are insoluble in water, glycerol is soluble in water.
Why are triglycerides insoluble?Triglycerides are esters of fatty acids and alcohol, mostly glycerol. The fatty acid chains are inked to the glycerol molecules with the help of covalent bonds.
This means that the triglyceride molecule is uncharged and will therefore remain insoluble in water but soluble in organic solvents.
Also, products of hydrolysis of triglycerides are fatter acids and glycerol. While fatty acids will remain insoluble in water, glycerol is soluble in water.
Glycerol is alcohol with 3 hydroxyl groups, this is why it is also called a polyol. They are able to hydrogen bonds with the nearby water molecules.
Therefore, triglycerides and fatty acids are insoluble and glycerol is soluble in water.
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PLZ HELPPPPPP
Which of the following is a possible consequence of solid pollutants in a lake or river?
O Build-up of garbage in freshwater
O Quick drop in dissolved oxygen
O Decrease in algae colonies
O Sudden hypoxic waters
HELP PLZ
Answers
Answer:
I believe it would be B.) Quick drop in dissolved oxygen
Quick drop in dissolved oxygen is a possible consequence of solid pollutants in a lake or river.
What is Biological Oxygen Demand?
Biochemical oxygen demand (BOD) is the amount of oxygen consumed by bacteria and other microorganisms while they decompose organic matter under aerobic conditions.
Solid pollutants in freshwater bodies like river and lake generally corresponds to organic wastes such as leaves, flowers and clothes which lead to increase in number of microorganisms in these water that further results in increase of BOD.
Drastic increase in microorganisms lead to drop in amount of dissolved oxygen in water, thus the possible consequence of solid pollutants in a lake or river is quick drop in dissolved oxygen.
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Yellow hair (Y) can be crossed with red hair (R) to create strawberry-blond. A yellow haired person is crossed with a strawberry-blonde person. What is the genotypic & phenotypic ratio of the children?
Answers
Answer:
Genotypic ratio = 2:2
Phenotypic ratio = 2:2
Explanation:
In image attached
the opening in the iris through which light passes is the:
Answers
Answer:
Pupil
Explanation:
This food web illustrates some characteristics that ANIMALS have in common. Find all the animals. What do they all
have in common?
A)
They are all predators.
B)
They must consume their food.
C)
They all have a skeletal system
D)
They all recycle matter in the food web.
Answers
Answer:
B) They must consume their food.
Explanation:
I just did the test
My Octopus Teacher
How does the filmmaker know when trust is obtained with the octopus?
Answers
Answer: Huh ?
Explanation: What is an octopus teacher ???
what compares nucleic acids and carbohydrates
Answers
Answer:
D. They both contain carbon, but only nucleic acids contain phosphorous.
Explanation:
what are ways in which carbon is released into the atmosphere?
Answers
Answer: Carbon is released back into the atmosphere when organisms die, volcanoes erupt, fires blaze, fossil fuels are burned, and through a variety of other mechanisms.
A rat has 42 chromosomes in eath somatic call. How many chromosomes are in each gamete
Answers
Answer:
21 chromosomes
Explanation:
Somatic cells are a diploid which have 2 sets of chromosomes. If two sets are 42 chromosomes, one set must be 21 chromosomes. Gametes are a haploid which have only 1 set of chromosomes. So in each gamete, there should be 21 chromosomes.
What did people previously believe about the movements of Sun and Earth?
Answers
Answer:
They thought of the geocentric theory, or that the earth was the center of the universe
Explanation:
what would happen to the carrying capacity of the ecosystem & why
Q-a volcano covers an area with 2 feet of lava
Answers
Answer:
The carrying capacity would shoot downward.
Explanation:
The area would no-longer be able to support organisms or the ground until the lava cools off. Even after then, any plants that may have been there will be gone, meaning that the ecosystem can now support less herbivores, as well as less primary producers (plants).
Less plants, means less herbivores, which means less of the animals that eat the herbivores (secondary and tertiary consumers).
How do plants help prevent erosion?
a) Plant leaves take in carbon dioxide during photosynthesis.
b) Plant leaves are used to create fabrics and other materials.
c) Plant roots help to hold soil in place.
d) Plant roots absorb water from the ground.
Answers
what are the small pores called where carbon dioxide come in
Answers
Answer:
Stomata
Explanation:
These are the small pores in plant stems or leaves that allow carbon dioxide in and oxygen and water vapor out. Each tiny hole is surrounded by a pair of cells called guard cells. These cells control whether a stoma is open or closed.
Which of the following steps occurs in the light-dependent reactions of photosynthesis but not in the light-independent reactions?
Choose 1 answer:
(Choice A)
Chemical reactions produce glucose, ADP, and NADP^+
(Choice B)
Chlorophylls absorb light energy, which eventually breaks the bonds of water molecules.
(Choice C)
ATP and NADPH are used for carbon fixation.
Answers
Answer:
I think it is Chemical reactions produce glucose, ADP and NADPH
Explanation:
Photosynthesis is a chemical reaction that takes place to convert light energy. The photosynthetic light-dependent reaction forms glucose, ATP, and NADP⁺. Thus, option A is correct.
What is a light-dependent reaction?
A light-dependent reaction is a photosynthetic reaction that occurs in the presence of sunlight and produces chemical energy in the form of NADPH and ATP.
The products of the photosynthetic light-dependent reaction are used in light-independent reactions. In light-dependent, the photosystem gets excited and produces ATP from ETC, leading to reduction of NADP⁺ and photolysis of the water molecule.
Therefore, ADP and NADP+ are produced at the intermediary stage of the light-dependent reaction which makes them different from the light-independent reaction.
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Which substance cannot be broken down into simpler substances?
Answers
Answer:
A Elements
Explanation:
Elements are pure substances that cannot be broken down into simpler substances by ordinary chemical means.
How much percentage of water does the human body have?
Answers
Answer:
Up to 60% of the human adult body is water. According to H.H. Mitchell, Journal of Biological Chemistry 158, the brain and heart are composed of 73% water, and the lungs are about 83% water. The skin contains 64% water, muscles and kidneys are 79%, and even the bones are watery: 31%.
Explanation:
does this help please mark brainliest
■ About 60% - 70% of the human body is water.
■ This can vary from person to person though. ■ The average in females is 45% - 60% , while in males it's 50% - 60%.
■ Babies have more water content percentage (70% - 75%).
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When was a control used in the investigation of the amphipods and sea butterflies? Why was a control necessary?
Answers
pteropods or sea snails, also called sea angels, produce chemical deterrents to ward off predators, and some species of amphipods take advantage of this by carrying pteropods piggyback to gain protection from their voracious predators.
Why was progress in science interrupted during the dark ages? The Roman Empire fell in the 5th century thus advancements in science came to a halt. As science halted in Europe, where else did it advance? Science advanced in other areas of the world like China, Polynesia, and Arab nations.
the production of alcohol by yeast cells is the result of
Answers
Answer:
Fermentation
Explanation:
Hope this helps!
The production of alcohol by yeast cells is the result of anaerobic respiration. The correct option is D).
What are anaerobic respirations?All living cells undergo respiration, a chemical activity that releases energy from glucose. Without oxygen, anaerobic respiration occurs and produces less energy but does it more quickly. Fermentation refers to anaerobic respiration in microorganisms.
When you work out vigorously, your muscles engage in anaerobic respiration. Compared to aerobic respiration, less energy is released because glucose is not completely broken down.
During intense activity, lactic acid accumulates in the muscles. Later, the lactic acid must be oxidized to produce carbon dioxide and water.
Therefore, the correct option is D) Anaerobic respiration.
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The question is incomplete. Your most probably complete question is given below:
A) Darkness B) Aerobic respiration C) Photosynthesis D) Anaerobic respiration