What happens to the speed of a chemical reaction when a catalyst is present
A catalyst is a compound which when added to a chemical reaction increases the rate of a chemical reaction by decreasing the activation energy required by the reactants.
What is a Catalyst?
A catalyst is a compound or element that is added to a chemical reaction increases the rate of a chemical reaction. This is possible because the catalysts decreases the amount of activation energy required by the reactants to undergo collision which will form the product.
A catalyst is found to be most effective in finely divided form as it has more surface area and at optimum conditions of pH, temperature and pressure. Example: Nickel is used as a catalyst in hydrogenation of palm oil into margarine to increase the rate of the reaction.
Catalyst increases the rate of a chemical reaction but they do not give any information about the spontaneity of a chemical reaction.
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Discuss THREE properties of water. Explain each of the following in terms of the properties of water. You are not limited to the three properties discussed in part (a). the role of water as a medium for the metabolic processes of a cell. the ability of water to moderate temperature within living organisms and in organisms’ environments. the movement of water from the roots to the leaves of plants.
Water's primary properties include polarity, cohesion, adhesion, surface tension, high specific heat, and evaporative cooling.
What is polarity?Polarity is a detachment of electric charge that results in an electric dipole moment in a molecule or its chemical groups, with a negatively charged end as well as a positively charged end.
Hydrogen bonding is also responsible for water's distinctive physical properties, which include a high heat of vaporization, a high surface tension, a high specific heat, and pretty unanimous solvent properties.
Despite the fact that it contains no calories, water serves as the medium for the majority of chemical reactions in the body, particularly those responsible for energy manufacturing.
Water regulates temperature by soaking up heat while remaining constant in temperature.
As a result, the climate can remain more stable. Water's high specific heat will indeed enable organisms to maintain constant internal environments.
The transpiration stream in plants is the continuous flow of water and solutes chosen to take up by the roots and transferred via the xylem to the leaves, where it evaporates into the substomatal cavity's apoplast interface.
Thus, these are some of the properties of water.
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A woman with long hair is a suspect in a burglary case. at the crime scene, several long hairs were found attached to a broken lock of the safe. the police obtain a warrant and request a sample of 25 to 50 hairs from this woman. they tell the woman it is important that they pull the hairs from her head rather than to merely cut the hairs. the police suspect that the woman was stealing to help support a drug habit.
a. why is it important that the police pull the hairs from her head rather than cut her hair?
b. why is it necessary to obtain 25 to 50 hairs from this woman?
c. the woman denies that she is currently taking drugs and states that she stopped using drugs a year ago. explain how the police can determine if the woman has been off drugs for over one year.
d. suppose the hairs of the woman match the hairs found at the crime scene. why does this not necessarily prove that she was the guilty party?
A product's transformation process includes all the steps in making a product from production to use and disposal of a product. During the production of energy phase of a nuclear reactor, which of these creates the greatest strain on earth's resources?
A product transformation _____.
multiplies coordinates to transform the imagecombines the coordinates of multiple transformationsfinds the result of combining multiple transformationsWhen glass shatters does the density change?
Use the diagram to answer each question. Table of Classification Labels Classification Level Aardwolf Gray Wolf Coyote Lion Blue Whale Kingdom Animalia Animalia Animalia Animalia Animalia Phylum Chordata Chordata Chordata Chordata Chordata Class Mammalia Mammalia Mammalia Mammalia Mammalia Order Carnivora Carnivora Carnivora Carnivora Cetacea Family Hyaenidae Canidae Canidae Felidae Balenopteridae Genus Proteles Canis Canis Panthera Balaenoptera Species Proteles cristatus Canis lupus Canis latrans Panthera leo Balaenoptera musculus Which of the organisms in the table is least similar to the others? Explain.
the blue whale is the least similar
Please help me! I have a mid term tomorrow, and this question is on the review.
Describe how high-energy electrons are ultimately responsible for driving the photosynthetic reactions
High-energy electrons are ultimately responsible for driving the
photosynthetic reactions due to the following:
They help transform ADP and NADP into ATP and NADPH respectively These are then sent to power light-independent reactions that create sugar.Light energy from the Sun excites the electrons in the plants which provides
them with energy for movement through membranes.
The high energy electrons help transform ADP and NADP into ATP and
NADPH respectively which are then used in the light-independent stage to
create sugar which is the final product of photosynthesis.
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A postpartum patient with hearing impairment asks the nurse, how will i know when the baby cries? what does the nurse instruct the parent to do?
"what marine ecosystem is most similar to a tropical rainforest in terms of diversity?"
Final answer:
The tropical coral reef ecosystem is most similar to a tropical rainforest in terms of diversity, with both environments providing complex habitats for a multitude of species and contributing greatly to Earth's productivity.
Explanation:
The marine ecosystem most similar to a tropical rainforest in terms of diversity is the tropical coral reef ecosystem. Like tropical rainforests, tropical coral reefs are incredibly diverse and complex ecosystems that provide home to a vast number of species, including corals, fish, molluscs, and marine mammals.
Coral reefs are comparable to tropical forests because they both have exceptionally high levels of biodiversity and structural complexity. Not only do these ecosystems harbor thousands of different species, but they also support intricate ecological interactions such as symbiotic relationships, predation, and competition for resources.
Moreover, tropical coral reefs contribute significantly to global productivity just as tropical rainforests do, with their resident phytoplankton performing a significant portion of the Earth's photosynthesis. These ecosystems are critical for the health of the ocean and provide numerous benefits, including fisheries, shoreline protection, and supporting marine life.
__________ proposes that humans are unaware of much of the stimuli in our environment, such as light waves and odors.
Final answer:
The key topic discussed is the low awareness of humans to environmental stimuli due to sensory adaptation and selective attention, highlighted by the cocktail party effect.
Explanation:
The concept being described is that humans are not always aware of the various stimuli in our environment, such as light waves and odors. This phenomenon can be understood through terms like sensory adaptation, where we do not perceive stimuli that remain relatively constant over prolonged periods of time. Our brains are constantly receiving and evaluating sensory information but due to the vast quantity of information, only a portion is consciously processed.
An example of this is the "cocktail party effect," where you may not consciously notice all conversations in a noisy room, but you will likely recognize when your name is spoken. This showcases our brain's selective attention and the background processing taking place, demonstrating that we are constantly in a state of low awareness, not fully perceiving the breadth of sensory information surrounding us.
Which statement about male and female cones is true? asap!!!
a-Male cones are smaller than female cones.
b-Female cones are smaller than male cones.
c-Female cones release more pollen than male cones.
d-Male cones have more scales than female cones.
Answer: a-Male cones are smaller than female cones.
The cones are the characteristics of the gymnosperms plant species specifically to the Conifers. These plants exhibit naked ovules and the pollination in these cones is aided by the wind pollination. The male cones are smaller than the female cones and grows on the lower branches of the trees whereas the female cones grows on the higher branches. Each bract or scale of the male cone exhibit numerous pollen grains which are blown away by the wind and they pollinate the ovules of the female cones. Each bract or scale of female cone exhibit an ovule at the lower end. Each ovule is fertilized by the pollen to form the seed.
Answer:
a. Male cones are smaller than female cones.
Explanation:
Today, biological anthropologists prefer to use the term ________ rather than race
Which substage of sensorimotor development is characterized by coordination of vision and touch, i.e., hand-eye coordination?
What provides instructions to an Eukaryotic cell about living and growing?1.mitochondria2.nucleus3.plasmids4.dna
Compare and contrast internal rotators and external rotators of the shoulder joint
Internal rotation, or medial rotation, occurs when you rotate your upper arms or your thighs toward the midline of your body. For example, if you stand in anatomical position and turn your arms and hands inward, so that your palms face your thighs, you would be internally rotating your shoulder. Several muscles in your shoulder -- namely the pectoralis major, latissimus dorsi and the deltoids -- accomplish this motion. Similarly, if you stand in anatomical position and turn your legs and feet so that your toes point inward, toward the space between your legs, you would be internally rotating your hips. Several muscles in your hips -- the gluteus minimus, gluteus maximus and piriformis -- accomplish this action.
External RotationWhen you externally rotate, or laterally rotate, your shoulder, you turn your arm and hand away from the center of your body so that your palm faces away from your thigh, when you’re standing in anatomical position. For the hip, external rotation involves turning your thigh so that your toes point out to the side. Deep within your hip, underneath your glutes, lie the muscles responsible for external rotation. Your shoulder external rotators include the poster fibers of the deltoids, the teres minor and the infraspinatus
The inner and outer rotators of the shoulder joint work with average and horizontal turn, separately. The inner rotator is fundamentally the subscapularis, while the outside rotators incorporate the infraspinatus and teres minor.
The shoulder joint, otherwise called the glenohumeral joint, is a multiaxial ball-and-attachment joint that empowers different developments including inner (average) and outer (sidelong) pivot. Inside revolution includes moving the front surface of the arm toward the midline of the body, essentially worked with by muscles like the subscapularis.
Alternately, outer revolution moves the foremost surface of the arm away from the midline, with muscles like the infraspinatus and teres minor assuming key parts.
The essential help for the shoulder joint comes from the rotator sleeve, a gathering of four muscles:
supraspinatus, infraspinatus, teres minor, subscapularis.These muscles act to turn the arm as well as settle the top of the humerus inside the glenoid pit, working as unique tendons to offer primary help. Inward Rotators: SubscapularisExternal Rotators: Infraspinatus, Teres Minor
Which has a greater impact on the survival of an organism, temperatures above its maximum temperature or temperatures below its minimum temperature?
Extreme temperatures, both above and below an organism's tolerance range, can impact survival, with high temperatures causing rapid fatal outcomes due to enzyme degradation, and extremely low temperatures slowly leading to metabolic shutdown. Extremophiles are notable exceptions that can thrive in such extreme conditions.
Both temperatures above the maximum threshold and temperatures below the minimum threshold can have a profound impact on the survival of organisms. However, each situation affects the physiology of organisms in different ways. Temperatures exceeding the upper limit can lead to enzyme degradation, while temperatures below the lower limit can reduce metabolic rates to a point where the organism cannot sustain necessary life functions. With a drop in temperature, metabolic rates can decrease, thus lowering energy and oxygen needs, which might allow poikilotherms organisms that can endure a wide range of body temperatures to survive on less.
However, extreme cold can eventually lead to a complete metabolic shutdown. Conversely, temperatures that exceed an organism's tolerance can disrupt cellular structures and lead to fatal outcomes more swiftly due to protein denaturation and increased metabolic demands beyond sustainable limits. Some organisms, known as extremophiles, have adapted to survive in these harsh temperatures, but they are exceptions rather than the rule.
Throughout most of the 1800s, the most widely accepted atomic theories were based on research performed by an English chemist named John Dalton. The main tenets of Dalton's theory were: Elements are made of tiny particles called atoms. Atoms cannot be divided into smaller particles. All atoms of a given element are identical. The atoms in one element are different from the atoms in another element. A chemical reaction is a rearrangement of atoms. Then, in 1897, while studying electric discharges in a cathode-ray tube, a British physicist named J.J. Thomson discovered electrons. Which tenet of Dalton's atomic theory did Thomson disprove? A. Elements are made of tiny particles called atoms. B. Atoms cannot be divided into smaller particles. C. The atoms in one element are different from the atoms in another element. D. All atoms of a given element are identical.
Answer:
B
Explanation:
I am taking Chemistry :)
For thousands of years, people have operated farms at the bases of active volcanoes in spite of the risks. what might be the reason for this?
Organisms need a way of storing energy because _____.
a.
a cell can't always immediately use all the energy it gets
b.
an organism often has times when no energy is used
c.
a cell can release only stored energy
d.
a cell cannot create energy and must get it from elsewhere in the organism
Organisms need a way of storing energy because cell can't always immediately use all the energy it gets.
What are cells?Cells are the basic building blocks of all living things. The human body is composed of trillions of cells. They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions.
Moreover, cells are of two types: eukaryotic, which contain a nucleus, and prokaryotic cells, which do not have a nucleus, but a nucleoid region is still present. Prokaryotes are single-celled organisms, while eukaryotes may be either single-celled or multicellular.
Therefore, cells provide structure and function for all living things, from microorganisms to humans. Scientists consider them the smallest form of life. Cells house the biological machinery that makes the proteins.
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Select all that are true of the resting membrane potential. it occurs when electrical charges across a membrane neutralize each other, so there is no charge difference. it involves sodium and potassium.
In contrast to positive and negative selection, _____ selection acts to maintain two or more alleles in a population.
The main immediate source of atp (lasting about 10 seconds) as muscle contractions begin comes from
The main immediate source of atp (lasting about 10 seconds) as muscle contractions begin comes from creatine phosphate. It is also known as a phosphorylated creatine molecule that presents as a quick mobilizable that keeps the high-energy phosphates in skeletal muscle and the brain to recycle the adenosine tri phosphate; which is considered as the energy currency of the cell.
Martin finds women with long, dark hair very sexually alluring, and all of his sexual partners have long, dark hair. charles also finds women with long, dark hair alluring. in order for charles to become aroused and reach orgasm, long, dark hair must be present, whether it is on a woman or not. martin's behavior might be classified as __________, whereas charles' behavior might be classified as __________.
Why are nails made of iron and not barium and phosphorus?
Nails used in construction are made of iron due to its strength, affordability, and availability. Barium and phosphorus have properties that make them unsuitable for the role iron plays in nails.
The question 'Why are nails made of iron and not barium and phosphorus?' could be interpreted in two ways: discussing human nails, which are made of keratin, or discussing metal nails commonly used in construction, which are often made of iron. If we are talking about construction nails, iron is used because it is strong, versatile, affordable, and widely available. Iron nails are prone to corrosion, which can be reduced by galvanizing or using stainless steel. However, using barium or phosphorus in nails wouldn't be practical as these materials have properties that make them unsuitable for the construction purposes that iron serves.
What is one way a person can help reduce the level of carbon dioxide in the atmosphere?
Final answer:
To reduce atmospheric carbon dioxide, one can contribute to reforestation efforts and avoid deforestation, as trees absorb CO₂ during photosynthesis. Alternative energy sources and reducing certain agricultural practices are also key measures.
Explanation:
One way to help reduce the level of carbon dioxide in the atmosphere is through reforestation—planting new trees and avoiding deforestation. Trees and plants absorb carbon dioxide and store it as part of their biomass through a process called photosynthesis. Since carbon dioxide is a major greenhouse gas that contributes to climate change, by increasing the number of trees, we can enhance the natural capacity of the environment to act as a carbon sink, thereby mitigating the effects of excess CO₂ in the atmosphere. Aside from reforestation, other measures include using alternative fuel sources that do not produce carbon dioxide, like solar and wind energy, and reducing activities such as livestock agriculture which contribute significantly to greenhouse gas emissions.
What percentage of the human genome is truly unique to the individual and usable for DNA profiling?
99.9%
50%
1%
0.1%
Answer:
0.1%
Explanation:
Humans share 99.9. % of genome with each other but we are still unique when it comes to the remaining 0.1% of genome. Since human genome is made of 3 billion base pairs, 0.1% means that we have 3 million unique base pairs. This portion is used for techniques like DNA profiling. It is used for paternity test and also used to determine the culprit at a crime scene.
Short tandem repeats or STRs are combination of base pairs which are repeated a number of times and they are unique to every individual. STRs fall under 0.1% of unique genome. If STRs in two samples match at the same loci, they belong to the same individual.
The entrance of a microbe into an individual's vascular space has initiated opsonization. how will the health care provider explain this process critical in stopping the infiltration of the microbe through opsonization
if you have ever used a compass, you know that it can be used to help navigate. It does this with a needle that always points north, so you know which direction you are heading. The needle points to the north because earth is like a giant magnet, with both north and south poles. According to current theory, the creation of earth's magnetic field is closely linked to
Oxygen starvation in a cell will most likely lead to
Which of the following statements about ATP (adenosine triphosphate) is correct? Hints Which of the following statements about ATP (adenosine triphosphate) is correct? The hydrolysis of ATP is an endergonic process. The cycling between ATP and ADP + Pi provides an energy coupling between catabolic and anabolic pathways. The hydrolysis of ATP can supply energy needed for catabolic pathways. Almost all of the free energy released on the hydrolysis of ATP is released as heat. The energy release on hydrolysis of ATP is the result of breaking a high-energy bond.
ATP is an unstable but essential molecule that provides energy for cells. It does this through a process called hydrolysis, which generates energy through the breakage of high-energy bonds with its phosphate groups. This energy is used to power various cellular activities, often through the process of phosphorylation.
Explanation:ATP (adenosine triphosphate) is a highly unstable molecule which functions as the primary energy-supplying molecule for living cells. ATP is composed of a nucleotide, a five-carbon sugar, and three phosphate groups. The bonds connecting these phosphates, known as phosphoanhydride bonds, are high-energy bonds. When ATP undergoes hydrolysis, it dissociates into ADP (adenosine diphosphate) and an inorganic phosphate ion (P¡), releasing energy which is largely used to perform cellular work. Cells use ATP by coupling the exergonic reaction of ATP hydrolysis with endergonic reactions. During this process, ATP donates its phosphate group to another molecule through a process known as phosphorylation. The phosphorylated molecule, due to this added phosphate group, is left in a higher energy, less stable state, enabling it to undergo its own endergonic reaction.
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