The properties of the elements are repeated after 2 8 18 and 32 elements because these are the maximum number of the electrons that the four shells contains.
The electronic configuration of the elements in the periodic table are repeated because the maximum number of the electrons that the four shells can have are 2 8 18 and 32. the name of the four shells are K , L, M, N. The electronic configuration of the elements are repeated and due to this the properties of the elements are repeated.
Thus, the properties of the elements are increases because the electronic configuration are repeated in the periodic table.
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Which component of the periodic table is needed to determine why KCl tastes like NaCl? A. Group B. Period C. Atomic Weight D. Atomic Number
Atomic Number of the periodic table is needed to determine why KCl tastes like NaCl.
What is the Periodic Table?
The Periodic Table is a tabular arrangement of the chemical elements organized by atomic number, electron configuration, and recurring chemical properties. It is one of the most important tools in chemistry, providing a useful framework to classify, systematize, and predict the properties of elements.
Atomic numbers are used to identify each element in the periodic table, and they are also used to determine the number of protons in the nucleus of an atom. The number of protons in an atom determines its chemical properties, and the similarity in the number of protons between two elements can explain why they have similar properties. In this case, the similarity in the atomic number of potassium (K, atomic number 19) and sodium (Na, atomic number 11) explains why the salts of both elements, potassium chloride (KCl) and sodium chloride (NaCl), taste the same.
Hence, Option D is correct.
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Which type of Electromagnetic wave has wavelength similar to the size of a 1 Peso coin
The microwave wavelength is the same as a one peso coin.
As you know, a peso coin is 24 mm in diameter. So the question becomes, what does an electromagnetic wave with a wavelength of 24mm look like? Wave velocity v, frequency f, and wavelength λ are related to each other. v=fλ
The velocity v in vacuum is the speed of light C₀ = 299792458 m/s. Therefore, the frequency is.
f=[tex]\frac{299792458m/s}{0,024m}[/tex] = 12.5GHz
This is commonly called microwave and its frequency is called Ku band. It is commonly used in satellite communications.
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Write the chemical symbols for three different atoms or atomic anions with 10 electrons
Answer:
i) Neon (Ne)
ii) Fluoride Ion (F⁻¹)
iii) Oxide Ion (O⁻²)
Explanation:
Ions are those charged species which are either positively charged (by loosing electrons) called as cations or negatively charged (by gaining electrons) called as anions.
In given examples, Neon is a neutral atom which has an atomic number 10. It contains 10 electrons in its neutral state with the electronic configuration 1s², 2s², 2p⁶.
Fluorine atom has an atomic number of 9. Therefore, it contains 9 electrons in its neutral state with an electronic configuration of 1s², 2s², 2p⁵. When Fluorine atom gains one electron it gets 10 electrons with electronic configuration of 1s², 2s², 2p⁶.
Oxygen atom has an atomic number of 8. Therefore, it contains 8 electrons in its neutral state with an electronic configuration of 1s², 2s², 2p⁴. When Oxygen atom gains two electron it gets 10 electrons with electronic configuration of 1s², 2s², 2p⁶ forming an Oxide Ion.
3. Contrast the three size-dependent physical properties. Next, circle the property
that changes with location.
Mass
Size-Dependent Properties
Weight
Volume
Ligh Spice
Physical characteristics known as size dependant properties alter as an object's size does. Examples of qualities that depend on size include length, width, height, volume, and mass.
What are the physical characteristics of an object that rely on its size?The amount or size of the material affects several physical properties of matter, including length, mass, volume, weight, and so forth. These characteristics of matter and their values change together with the size or quantity of the substance.
What is a characteristic of mass?In physics, mass is a way to measure inertia, a fundamental property of all matter. In actuality, it is the resistance a body of matter provides to a change in its speed or location.
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Are used for energy storage to build structures and as signal molecules to help cells communicate with each other
Yes, carbohydrates are used for energy storage to build structures, and as signal molecules to help cells communicate with each other.
Carbohydrates and functionsCarbohydrates are molecules that consist of carbon, hydrogen, and oxygen atoms and can be broken down by the body to provide energy. They are used to build the structural components of cells, such as the cell walls and membranes, and are also used as signal molecules between cells. As signal molecules, they can help cells communicate with each other and respond to changes in the environment.
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While massing a hazardous solid on the balance, a lab student finds the amount taken is larger than needed and removes a small portion with a spatula. What is the recommended strategy for dealing with the excess material
As with any laboratory work, adequate facility design, operation, and monitoring, as well as excellent work practices, are necessary to protect laboratory staff against the hazard.
Both degrees of protection are based on the principle of ALARA (as little as reasonably possible) exposure. Electricity Risks By adopting adequate measures, the electrocution dangers of electrically powered instruments, tools, and other equipment are nearly completely minimized, therefore their use in the hazard need not represent a serious risk. You need the correct sort of scales if you want to weigh laboratory samples accurately. To accurately weigh the lab samples, for instance, you may use an analytical balance. The reliability of the weighing device will determine how accurate and precise the findings are.
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Determine the empirical formula for each
compound.
a.
ethylene (C,H,)
b.
ascorbic acid (CH,O)
C.
naphthalene (CH)
Ethylene C2H2 , ascorbic acid formula C₆H₈O₆, naphthalene Chemical formula C₁₀H₈.
What the empirical formula tells us?The relative ratios of the various atoms in a compound are given by an empirical formula. The ratios are still valid at the molar level. H 2 O is made up of two hydrogen atoms and one oxygen atom. Similar to this, 1.0 mole of H2O is made up of 1.0 mole of oxygen and 2.0 moles of hydrogen.
What are the ascorbic acid ?Originally known as hexuronic acid, ascorbic acid is an organic molecule having the formula C 6H 8O 6. Although impure samples may appear yellowish, it is a white solid. Water readily dissolves it, resulting in moderately acidic solutions. It is a gentle reducer.
There are two enantiomers (mirror-image isomers) of ascorbic acid, generally referred to as "l" (for "levo") and "d." (for "dextro"). The most prevalent isomer is the l one, which is a naturally occurring form of vitamin C (also known as a "vitamer") and is necessary for both humans and many other animals to survive. Scurvy is caused by vitamin C deficiency and used to be a serious condition affecting sailors on lengthy sea trips. Due to its antioxidant qualities, it is utilized as a nutritional supplement and food additive.
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2POCl3(g)---> 2PCl3(g)+O2(g), deltaH_o=572 kJ, delta S_o=179 J/K
At what temperature (if any) would the decomposition of POCl3 become spontaneous?
At T=3195.53 Kelvin, decomposition of PoCl3 becomes spontaneous.
What is meant by spontaneous?In chemistry, spontaneous processes is one that occurs without addition of external energy. Spontaneous process can occur quickly or slowly, because spontaneity is not related to the kinetics or reaction rate.
Spontaneous reaction happens in given set of conditions without interruptions whereas the nonspontaneous reaction occurs with the help of external agents like heat or energy.
Given, ∆H=572KJ and ∆S=0.179J/K
According to thermodynamical concept;
As, T=∆H/∆S,
=572/0.179
= 3195.53 Kelvin
We know, change in Gibbs free energy (∆G)=0 ; which shows that reaction is in equilibrium.
Above this temperature the reaction becomes spontaneous and moves in forward direction.
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Problem that can be caued by both the complete and incomplete
combution of methane in a ga fire
Oxidation of methane to soot:
CH4(g)+O2(g)⟶C(s)+2H2O(g)
Among the hydrocarbons is methane, CH4(g). Only the elements carbon (C) and hydrogen (H) are present in the complex. When methane burns with too much oxygen, it produces water vapor and carbon dioxide gas CO2(g) (g). Complete combustion is defined as combustion with extra oxygen.
Methane can be partially oxidized into a variety of compounds when it is burned inefficiently, including CO, methanol, formic acid, formaldehyde, and higher hydrocarbons.
Carbon monoxide is an extremely toxic gas. It is invisible and odorless. Without anybody being aware of it, malfunctioning gas fireplaces or boilers can poison the air in a room by emitting carbon monoxide.
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The complete question is
Problems that can be caused by both the complete and incomplete
combustion of methane in a gas fire.
if elements have the same number of valence electrons, they are
a) called halogens
b) called noble gases
c) in the same group
d) in the same period
Answer:
c
Explanation:
valence is the number of electrons in the outer most she'll.. therefore all elements in the same group have the same valences for example group one elements have a valence of one
I hope this helps
Enzyme ______ bind to an enzyme to turn it off, thus preventing it from catalyzing a reaction. Multiple choice question
Enzyme Inhibitors bind to an enzyme to turn it off, thus preventing it from catalyzing a reaction.
An enzyme is a biological molecule that catalyzes chemical reactions in the cell. Enzymes work by lowering the activation energy required for a reaction to occur, making it more likely that the reaction will proceed. However, enzymes can also be inhibited, which means that their activity is reduced or stopped completely. This can happen for a variety of reasons, such as the presence of a specific molecule called an inhibitor.
Some inhibitors bind to the active site of the enzyme, preventing the substrate from binding and thus preventing the reaction from occurring. Other inhibitors bind to other parts of the enzyme, causing a conformational change that prevents the enzyme from working. Still, other inhibitors bind to enzymes and alter their activity by non-covalent interactions.
There are different types of inhibitors like competitive inhibitors bind to the active site of an enzyme and prevent substrate binding. Non-competitive inhibitors bind to a different site on the enzyme, causing a conformational change that makes the enzyme less active. Feedback inhibitors bind to the end product of a metabolic pathway, inhibiting the enzyme that catalyzes the first step of the pathway.
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Between what is expected and what actually happens?
Irony is a mismatch between what is expected and what actually occurs. These literary methods aid in the creation of dramatic effects in writing.
What is Irony?Irony is a disconnect between what is expected to happen and what actually happens. These types of literary devices help in creating a dramatic effect in literature.
Irony is a literary device which was used extensively in Greek tragedy. It involves expressing the meaning of something by making use of words which technically mean the opposite of the original thing being conveyed.
Irony is used for a dramatic or humorous effect. There are three types of irony seen in literature as follows:
• Verbal Irony
• Situational Irony
• Dramatic Irony
Verbal irony involves the usage of different words to mean something dissimilar to what they look like they actually mean.
Situational Irony means that what happens is totally different from what was expected to be happening.
Dramatic Irony occurs in plays, etc. where the audience or the readers are more aware of what is actually going on as compared to the character in the scene.
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A 70g chunk of metal at 180C was dropped in a bucket containing 400g of water at 25C. The final temperature of the mixture was 28C. What is the specific heat capacity of the metal
Thus, the metal has a mhm specific heat capacity of 2.472 Joel program degrees Celsius.
To calculate the temperature change (T), subtract the end temperature from the initial temperature. Multiply the temperature change by the sample's mass. Share the product's energy and heat output. The equation is C = Q / (T m). The amount of heat energy per unit mass needed to raise the temperature by one degree Celsius is known as the specific heat. The form given below, where c is the specific heat, is typically used to express the relationship between heat and temperature change. Let S represent the water's specific heat capacity. Consequently, the combined temperature of 50g of water at 20°C and 50g of water.
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6.
In Period 2, as the elements are considered from
left to right, there is a decrease in
BO
A.
ionization energy
B.
atomic masS
C.
metallic
character
D. nonmetallic character
List the number of sigma bonds and pi bonds in a double bond. Group of answer choices 2 sigma, 0 pi 1 sigma, 2 pi 1 sigma, 1 pi 2 sigma, 3 pi
There is one sigma as well as one pi bond in a double bond.
Sigma bonds and pi bonds are the two types of covalent bonds. Sigma bonds are formed when there is an end-to-end overlapping of the atomic orbitals. A pi bond is formed when there is a lateral or a side-by-side overlapping of the atomic orbitals.
The sigma bonds are represented by a "σ" symbol and pi bonds are represented by "π" symbol. One sigma bond is there in a single bond. A double bond contains one sigma as well as one pi bond. A triple bond has one sigma as well as two pi bonds.
--The given question is incomplete, the complete question is
"List the number of sigma bonds and pi bonds in a double bond. Group of answer choices 2 sigma, 0 pi 1 sigma, 2 pi 1 sigma, 1 pi 2 sigma, 3pi, 1pi 1 sigma."--
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Everyone!
Give a Question/Problem for Hot and Cold Compress Pillow
Thank you!!
Answer:
are u good at geometry math? their are some questions I didn't understand it PLEASE
What element has 4 protons 6 neutrons and 4 electrons
Answer:
Beryllium is the element that is atomic number 4 on the periodic table.
What are the 7 are elements?
The classical elements or seven elements in nature are plants, warm energy, soil, mineral, water, cold energy, and air.
Living organisms incorporate distinctly massive quantities of oxygen, carbon, hydrogen, nitrogen, and sulfur (those 5 factors are called the majority factors), together with sodium, magnesium, potassium, calcium, chlorine, and phosphorus (those six factors are called microminerals). From the smallest atom to a massive whale to the sun machine itself, all matters are stated to be composed of a few aggregate of those elements. Halogens belong to group 17, and they acquire only one electron in order to attain stable electronic configuration.
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A beautyberry is a type of shrub that grows well in the southern United States. Some students have a small beautyberry shrub that is growing near their school. They record the number of berries, ripe or unripe, and the number of flowers at different times throughout the year.
Table. Column headings. Month, ripe berries, unripe berries, flowers. September, 9, 4, 2. October, 5, 10, 4. November, 5, 7, 3. December, 2, 3, 1. February, 3, 2, 0. March, 6, 11, 5. April, 12, 5, flowers 9. June, 3, 8, 2.
Which statement best explains what is shown in their data?
Choose the correct answer.
Responses
A.The beautyberry relies on wind to spread its seeds.
B..The beautyberry relies on one type of animal to eat the berries.
C.The beautyberry uses asexual reproduction to make new plants.
D.The beautyberry increases its chances of reproduction because its berries do not all become ripe at the same time.
Note that statement best explains what is shown in the above-tabularized data is: "The beautyberry increases its chances of reproduction because its berries do not all become ripe at the same time. (Option D)
What is the rationale for the above answer?The statistics in the above table appear to reflect the ripening of berries and the number of blossoms of a plant, presumably called beautyberry. It can be noticed that the amount of ripe berries and blossoms varies each month.
This implies that the beautyberry does not produce all of its berries at once, but rather over the course of several months. This might boost the odds of reproduction by providing a food supply for animals and birds for a longer length of time.
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7.92g of FeSO4 • 6H2O is equal to how many molecules?
7.92g of FeSO4 • 6H2O is equal to 1.55 x 10^23 molecules.
What is molecules?Molecules are the smallest units of matter that can exist by themselves. They are composed of two or more atoms that are held together by chemical bonds. Molecules can be found in the air we breathe, the water we drink, and the food we eat. They can also be found in living organisms, like plants and animals. Molecules can be made of a variety of different atoms, such as oxygen, carbon, nitrogen, and hydrogen. They also come in different shapes and sizes, depending on the types of atoms they are composed of.
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A compound with a molecular mass of 56.104 grams is found to be 86% carbon. The rest of the compound is hydrogen. Find its molecular formula. Group of answer choices C3H6 C4H8 C2H4 C6H10
The molecular formula for this compound is C4H8 that can be calculated from its empirical formula.
The empirical formula of a chemical compound is the simplest whole number ratio of atoms present in a compound. The compound is made up of only carbon and hydrogen atoms thus it is known as hydrocarbon. The percentage of carbon is 86%, therefore the percentage of hydrogen is 14%.
The molecular mass of the compound is given i.e., 56.104 grams.
Moles of C= 86 g * 1 mol/12 g =7 moles
Moles of H=14 g* 1 mol/1 g= 14 moles
Thus, the mole ratio of C:H can be given as:
Moles of C/ Moles of H= 7/14=1/2
Thus, the empirical formula is CH2 while its molecular formula is C4H8.
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Human population growth in 2018 was 1. 7%. If this rate of growth remains constant, in what year will the human population double?
Human population growth will Double time and that will be 41.17 years
Human growth can be defined as;
The growth and development are positively influenced by factors, like parental health and genetic composition.
Population growth is the increase in the number of humans on Earth.
Human population has grown exponentially over the past century. It has done so largely by producing large amounts of food, and learning how to control disease.
We can find what year the human population would double using the rule of 70. This is given as;
Double time = 70 / rate(r)
Double time = ?
Rate = 1.7%
Inserting into the equation;
Double time = 70 / 1.7
Double time =41.17 years
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3. Magnesium is a metal.
a. Describe the structure and bonding in magnesium.
b. Why can magnesium conduct electricity when solid?
c. Why is magnesium malleable?
Yes, magnesium is a metallic element and is a member of the alkaline earth metals group.
What is Magnesium?
Magnesium is a chemical element with the symbol Mg and atomic number 12. It is a silvery-white, highly reactive metal that is essential for many biological processes. Magnesium is the eighth most abundant element in the Earth's crust and the fourth most abundant element in the human body.
It is an important component of many enzymes, proteins, and other molecules. Magnesium is found naturally in many foods, including green vegetables, nuts, and grains. Magnesium plays a role in maintaining normal muscle and nerve function, keeping a healthy immune system, regulating blood sugar levels, and helping to form strong bones.
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What happens to the molecules in the room as they change from a liquid to a gas?
When a liquid changes to a gas, the molecules in the room gain enough energy to break the bonds that hold them together in the liquid state.
What are Molecules?
Molecules are the smallest unit of matter that still has the properties of a particular substance. They are made up of two or more atoms that are bonded together. Molecules can be covalent, meaning the atoms in the molecule share electrons, or ionic, meaning one atom has donated electrons to the other.
This energy comes from an increase in temperature, which causes the molecules to move faster and farther apart. As the molecules move around and expand, they fill the room with a vapor or gas.
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A scientist is studying the liquid shown here. She thinks the liquid is a mixture.
Describe an investigation she could do to demonstrate that the liquid is in fact a
combination of substances.
100
1300
200
100
800-m
Answer:
You have not shown the liquid which is to be shown, please show us
Photosynthesis Notes
1. Give the Greek root word meaning for photoautotroph.
2. What was von Helmont testing with his willow tree experiment? What was the result?
3. Define the law of conservation of mass.
4.
Describe the experiment used by Joseph Priestly to discover oxygen.
5. List the primary constituents of air.
a.
b.
C.
d.
e.
6. What did Jan Ingenhousz discover about plants?
7. Based on the work of Nicolas de Saussure, what are the two primary sources of mass for
plants?
8. Define photosynthesis-
9. Define potential energy-
Photoautotroph has been derived from the combination of three words, photo -meaning "light", autos- meaning "self", and troph meaning "nutrition".
Land plants and photosynthetic algae are both photoautotrophs. These species contain pigments that can capture light, like chlorophyll. Origin of the word: photo- (light) + auto (self) + troph (nourishment). Autotrophs known as photoautotrophs generate complex chemical substances like proteins, lipids, and carbohydrates by absorbing light. Photosynthesis is the name given to this light-mediated process.
An energy-rich carbohydrate like glucose is produced by plants using carbon dioxide, inorganic salts, and water during a process called photosynthesis. As a byproduct, oxygen is also produced, other than glucose. Land plants and photosynthetic algae are both photoautotrophs. These species contain pigments that can capture light, like chlorophyll.
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What is the freezing point of the solution after you add an additional 1. 34 g (Use i = 2. 5 for MgCl2)
The freezing point of the solution after you add an additional 1.34 g is -0.808°C.
What is freezing point of a solution?A solution's freezing point is lower than the pure solvent's freezing point. This means that for freezing to happen, a solution needs to be cooled to a lower temperature than the pure solvent.
We use the equation: to determine the mass of the solution
Density = mass/volume
1.05 g/ml = mass/ 50ml
mass = 1.05×50
mass = 52.5g.
Percentage of magnesium chloride in the solution is 1.52%
Mass of magnesium chloride in the solution = 1.52 % of 52.5 g
Mass of magnesium chloride in the solution = 1.52/100×52.5
Mass of magnesium chloride in the solution = 0.798g
The following equation is used to determine depression in freezing point:
ΔTf = Freezing point of pure solution - Freezing point of solution
ΔTf = i Kf m
Freezing point of pure solution - Freezing point of solution = i Kf m
m = m solute × 100/M solute × W solvent
Given values,
Freezing point of pure solution (water) is 0°C
i is Vant hoff factor = 2.5
Kf molal freezing point elevation constant = 1.86°C/m
m solute given mass of solute (magnesium chloride) = [0.798 + 1.34] g
m solute = 2.138 g
M solute molar mass of solute (magnesium chloride) = 95.2 g/mol
W solvent mass of solvent (water) = [52.5 - 0.798] g = 51.702 g
substitute the given values,
0 - Freezing point of solution = 1×1.86×2.138×1000/95.2×51.702
Freezing point of solution = -0.808°C.
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Complete question is " A 50 mL solution is initially 1.52% MgCl₂ by mass and has a density of 1.05 g/ml
What is the freezing point of the solution after you add an additional 1.34 g MgCl₂? (Use i = 2.5 for MgCl₂)."
What is the first thing you should do following an accident with a chemical?
Immediately rinse chemicals off with a lot of water.
Different assistance must be used because different chemical accidents might occur in various ways.
Help while inhaling a chemical:To provide the person access to fresh air, remove them from the factory or work location. Make sure your company has a plan in place for what to do if a worker becomes unconscious or is unable to move. If the person has inhaled chemicals, administer oxygen from an oxygen tank.
Help if a Chemical touch your skin:Immediately rinse chemicals off with lots of water for at least 15 minutes. The more quickly and for a longer period of time you start to pour water over the region, the more damage you will limit. Chemicals that catch fire or absorb quickly through the skin must be washed for a longer time, 30 minutes to 1 hour.
Help if chemical is in eye:Right away, rinse the eye or both eyes. Rinse for at least 15 minutes while using a lot of water. If you have an emergency eye wash, activate it while keeping your eyes open with your fingers. If you must use your hands to splash water in your eyes, keep them open while doing so. Seek assistance in keeping them open.
Help if chemical is in mouth:Look for the chemical label or any other relevant information. Typically, the label will provide information on "ingestion" in the first aid section. If the person should vomit up the chemical or not is determined there. It is crucial that you heed that counsel. If the chemical is consumed, the label can include an antidote. Give the remedy if you have it.
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An extremely efficient enzyme has a ____ KM and a ____ kcat.
An extremely efficient enzyme has a small KM and a large kcat.
The conversion rate at the lowest substrate concentration is measured in kcat/km. This interpretation is accurate. kcat/Km is a good indicator of an enzyme's effectiveness since it takes into account both the enzyme's maximum rate, kcat, and its affinity for its substrate (Km).The turnover number, or the number of molecules that may be created per second per active site, of an enzyme is provided by the formula k c a t / kM.Because the substrate concentration is almost usually much greater than the Km, in many situations, enzymes are only better when they have a larger kcat. It seems disingenuous to me to use the ratio when this is plainly the case, yet it still happens much too frequently. It could serve as a useful benchmark when compared to enzymes in particular situations.
complete question:An extremely efficient enzyme has a _____ KM and a _____ kcat.
A) small; small
B) small; large
C) large; large
D) large; small
E) kcat and KM do nothing to predict the efficiency of an enzyme
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Explain what it means for materials to move down their concentration gradient and up their concentration gradient.
Moving down the concentration gradient means that materials move from an area of high concentration of the material to an area of low concentration of the material.
What is concentration?In chemistry, concentration is the amount of a substance in a given space. Another way to describe concentration is the proportion of the solute to a solvent or entire solution. In general, mass/unit volume is used to express concentration. Instead of using volume, concentration can be stated as a mass per unit. Although concentration is typically used to describe chemical solutions, it may be computed for any mixture.
This can be seen in osmosis, where water moves from a higher concentration of solute to a lower concentration of solute.
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