In areaction, the number of moles consumed and produced have the same ratio as the coefficients on the balanced equation.
So, to calculate the number of moles of any chemical on the reaction given the number of moles of any other, we can use a rule of three.
We put the compound or atom we want on the first column and the one we have information of on the second, and their coefficients on the second row:
We want Al and we have information about Al₂O₃, and their coefficients on the balanced equation are 4 and 2, so:
Al --- Al₂O₃
4 2
Now, we use thise placements to write the equation:
[tex]\frac{n_{Al}}{4}=\frac{m_{Al_2O_3}}{2}[/tex]Where the n stands for the number of moles. Now we solve for Al:
[tex]\begin{gathered} \frac{n_{Al}}{4}=\frac{m_{Al_2O_3}}{2} \\ n_{Al}=4\frac{m_{Al_2O_3}}{2} \\ n_{Al}=2m_{Al_2O_3} \end{gathered}[/tex]And since we know the number of moles of Al₂O₃, we have:
[tex]\begin{gathered} n_{Al_{2}O_{3}}=0.800mol \\ n_{Al}=2n_{Al_{2}O_{3}} \\ n_{Al}=2\cdot0.800mol \\ n_{Al}=1.600mol \\ n_{Al}\approx1.60mol \end{gathered}[/tex]Where the last step we did an approximateion to get to 3 significant figures.
So, the number of moles of Al consumed is 1.60 mol.
At a fixed temperature and pressure, the volume occupied by a gas is _____ proportional to the number of moles of gas present. For ideal gases under these conditions, equal _____ of gas contain equal numbers of particles or moles.
Answer:
that "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules." For a given mass of an ideal gas, the volume and amount (moles) of the gas are directly proportional if the temperature and pressure are constant.
Using a reactivity series, show which reactions can occur: (YES or NO)
1. Na replaces K?
2. Co replaces Cu?
3. Zn replaces Zn2+?
4. Ni replaces Ba?
1. Na cannot replace K
2. Co will replace Cu
3. Zn cannot replace itself
4. Ni cannot replace Ba
Cation reactivity seriesThe reactivity series is a table showing how reactive elements. The reactiveness could be in descending or ascending order.
Reactivity series exist for both cations and anions.
In this case, we are dealing with cations. The reactivity series for cations is in the attached image.
The following can be observed from the table:
K is above NaCo is above CuBa is above NiAs a rule of thumb, cations at the lower part of the table cannot displace cations at the upper part during reactions.
Thus:
Na (sodium) cannot replace K (potassium)Co (cobalt) will replace Cu (copper)Zn cannot replace itself. Zn and Zn2+ are the same.Ni cannot replace Ba.More on the reactivity series can be found here: https://brainly.com/question/14652325
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the pressure inside a hydrogen-filled container was 2.10 atm at 21 ∘c . what would the pressure be if the container was heated to 89 ∘c ? express your answer with the appropriate units.
By utilizing ideal gas laws and the conversion of given temperatures into absolute temperatures we can calculate that the pressure of the gas at 89 °C will be 2.59 atm.
Amonton's law (one of ideal gas laws) states that at constant volume and number of moles of the ideal gas, the pressure that the gas exerts is directly proportional to the temperature of the gas. In mathematical form:
[tex]\frac{P_{1} }{T_{1} } = \frac{P_{2} }{T_{2} }[/tex]
P is the pressure of the gas while T is absolute temperature (in Kelvins). First, we convert temperature in Celsius to Kelvins:
T1 = (21 + 273) K = 294 K
T2 = (89 + 273) K = 362 K
Now, we transform the Amonton's law equation so that we can calculate the pressure at the higher temperature:
P2 = T2 * P1 / T1
Finally, we plug the known values into the transformed equation:
P2 = 362 K * 2.10 atm / 294 K = 2.59 atm
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What happens in the process of beta decay?
Answer:
a neutron decays into a proton, an electron, and an antineutrino: n Æ p + e - +.
Explanation:
In beta plus decay, a proton decays into a neutron, a positron, and a neutrino: p Æ n + e+ +n. Both reactions occur because in different regions of the Chart of the Nuclides, one or the other will move the product closer to the region of stability. These particular reactions take place because conservation laws are obeyed. Electric charge conservation requires that if an electrically neutral neutron becomes a positively charged proton, an electrically negative particle (in this case, an electron) must also be produced. Similarly, conservation of lepton number requires that if a neutron (lepton number = 0) decays into a proton (lepton number = 0) and an electron (lepton number = 1), a particle with a lepton number of -1 (in this case an antineutrino) must also be produced. The leptons emitted in beta decay did not exist in the nucleus before the decay–they are created at the instant of the decay.
BRAINLIST AND 30 POINTS
Which of the following is NOT a physical change? [Choose all that apply.]
Group of answer choices
melting ice cream
water evaporating from a puddle
making elephant toothpaste
roasting a marshmallow
mashing potatoes
burning a piece of paper
cutting wood
Answer: Making elephant toothpaste, roasting a marshmallow, And burning a piece of paper are all examples of chemical changes.
Explanation:
A chemical change is when the atoms in something have broken old bonds and made new ones.
Making elephant toothpaste is NOT a physical change because two things are mixed together to make a chemical change and therefore it's a chemical change not a physical change.
Burning a piece of paper is not a physical change because when a paper is burned it turns into ash/dust and it changes its chemical composition. Therefore it's a chemical change, not a physical one
what is the order of chemical process in the synthetic cycle for generation of fatty acid? what is the order of chemical process in the synthetic cycle for generation of fatty acid? condensation, dehydration, reduction and reduction reduction, dehydration, condensation and reduction condensation, reduction, dehydration and reduction reduction, condensation, dehydration and reduction
The order of synthetic cycle for generation of fatty acid is Condensation > Reduction > Dehydration > Reduction.
What is fatty acid?
An aliphatic carboxylic acid with a saturated or unsaturated chain is referred to as a fatty acid and is employed in chemistry, particularly in biochemistry. In some species, like microalgae, fatty acids make up a significant portion of the lipids (up to 70% of the total weight). However, in some other creatures, such as triglycerides, phospholipids, and cholesteryl esters, fatty acids are not found in their freestanding form. In all of these forms, fatty acids are essential nutritional sources of energy for animals and essential cellular building components.
The synthetic synthetic cycle for the generation of fatty acids takes place in such a way that at first Condensation happens then Reduction then Dehydration then again Reduction happens.
The cycle of condensation, reduction, dehydration, and reduction continues until palmitoyl‐ACP gets completely made.
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Which items are fuel for physical activity.
Select 2 correct answer(s)
options:
A)Specialized sports drinks
B)Food Intake
C)Supplementation
D)Water Intake
Answer:
Water Intake,Food Intake
Explanation:
Which two terms describe this type of data?
A. Qualitative
B. Continuous
C. Quantitative
cm
D. Discrete
How to assure our bottled water is free of Calcium,
Magnesium and Lead ions.
Answer:
t can be removed by using a water softener
Explanation:
12. Which of these are the reactants in the photosynthesis equation?
O CO2 and water
02 and sugar
Energy and CO2
Sunlight and sugar
Answer:
The reactants of photosynthesis are carbon dioxide and water.
which of these sets of elements has similar properties? responses strontium, magnesium, calcium, beryllium strontium, magnesium, calcium, beryllium chromium, magnesium, iron, cobalt chromium, magnesium, iron, cobalt hydrogen, helium, neon hydrogen, helium, neon oxygen, nitrogen, carbon
Imagine that a researcher has developed a way to isolate thylakoids from chloroplasts and to make the ph of the thylakoid space acidic. If these isolated thylakoids are transferred to a ph8 solution in the dark, what might the researcher expect to observe?.
These isolated thylakoids are transferred to a ph8 solution in the dark, that the isolated thylakoids produce ATP.
Isolated thylakoidsThe chloroplasts are exposed to a hypotonic buffer devoid of sorbitol in order to achieve this. While stromal extract (SE) must also be isolated during this preparation if the cpSec1 or cpSRP pathways are to be studied, isolated thylakoids can be used to test any of the translocation pathways.
Can isolated thylakoids produce ATP?In the experiment that follows, it is possible to make thylakoid membranes that were isolated from chloroplasts produce ATP without the assistance of photosynthetic electron transport. Thylakoids are taken out of chloroplasts and suspended in a pH 4 buffer.
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Which statement describes the relationship of resistance and current?
Resistance is directly proportional to current because R = V over I..
Resistance is inversely proportional to current because R = .
Resistance is directly proportional to current because R = VI.
Resistance is inversely proportional to current because R = VI.
Resistance is inversely proportional to current because R = VI. Option D.
If you increase the applied voltage and don't change the resistance, the current will also increase. The higher the resistance the more strongly the electron interacts with the resistance, slowing it down. Electrons repel each other, so even if more electrons pass through the resistor this cannot be counteracted.
As resistance increases current decreases and all other factors remain constant. Materials with low resistance, such as metals, are called electrical conductors and allow current to flow easily. High-resistance materials such as plastics are called electrical insulators. Current is inversely proportional to resistance. If I fix the voltage across a variable resistor the current that flows is inversely proportional to the resistance.
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Answer:
B) Resistance is inversely proportional to current because R = V/I
Explanation:
in your experiment, you found a height difference () of 155.2 mm of hg at 22 oc. at that temperature, the vapor pressure of water is 19.8 mm hg. if the barometric pressure in the lab was 789 mm hg, what is the pressure of h2 in the buret (in mm hg)? note: do not include the units in your answer.
However, if it is heated to impregnated vapor, volume and work (1W2) will determine the final temperature. result (a) Indicate that the lift pressure should be 400 kPa, using v = V/ m = 0.1 m3/kg
Standard sets of circumstances for experimental measures to be produced at standard temperatures and pressures (STP) enable comparisons to be made between various sets of data. The most commonly used standards are those of the National Institute of Standards and Technology (NIST) and the International Union of Pure and Applied Chemistry (IUPAC), albeit these standards are not generally acknowledged. Different essential delineations for other associations' standard reference circumstances have been established.
In chemistry, IUPAC changed its description of standard temperature and pressure in 1982
Temperature and Pressure
Until 1982, STP was defined as a temperature of273.15 K( 0 °C, 32 °F) and an absolute pressure of exactly 1 atm(101.325 kPa).
Since 1982, STP has been defined as a temperature of273.15 K( 0 °C, 32 °F) and an absolute pressure of exactly 105 Pa( 100 kPa, 1 bar).
STP shouldn't be confused with the standard state generally used in thermodynamic evaluations of the Gibbs energy of a response.
NIST uses a temperature of 20 °C(293.15 K, 68 °F) and an absolute pressure of 1 atm(14.696 psi,101.325 kPa). This standard is also called normal temperature and pressure( shortened as NTP). still, a common temperature and pressure in use by NIST for thermodynamic trials is298.15 K( 25 °C, 77 °F) and 1 bar(14.5038 psi, 100 kPa). NIST also uses" 15 °C( 60 °F)" for the temperature compensation of refined petroleum products, despite noting that these two values aren't exactly harmonious with each other.
The International Standard Metric Conditions for natural gas and analogous fluids are288.15 K(15.00 °C;59.0.
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How do heat waves form
Answer:
Heat waves can form when a high-pressure system moves into a region and stalls. The system can force warm air downward, acting like a cap as it keeps the cool air near the surface from rising, according to AccuWeather. What qualifies as a heat wave can vary greatly from region to region.
is the following sentence true or false? every chemical or physical change in matter includes a change in energy
Determine what elements are denoted by the following electron configurations:
6) 1s²2s²2p 3s²3p4
7) 1s²2s²2p 3s²3p64s²3d¹04p65s¹
8) [Xe] 6s²4f¹2
9) [Xe] 6s4f45d10
10) [Ne]3s²3p4
The arrangement of an atom's or molecule's electrons in atomic or molecular orbitals is known as the electron configuration in atomic physics and quantum chemistry.
What is electron configurations?
One orbital can house a maximum of two electrons, and there are four different types of orbitals (s, p, d, and f). More electrons can be held in the p, d, and f orbitals since they contain various sublevels. Each element's position on the periodic table determines the specific electron configuration of that element. The arrangement of an atom's or molecule's electrons in atomic or molecular orbitals is known as the electron configuration in atomic physics and quantum chemistry.
A standardized notation is used for expressing electron configurations, in which the energy level and type of orbital are written first, followed by the number of electrons in the orbital, which is expressed in superscript. For instance, carbon's (atomic number: 6) electronic configuration is 1s22s22p2.
Hence. The elements are denoted by the electron configurations are,
1) Beryllium
2) Boron
3) Magnesium
4) Silicon
5) Phosphorus
6) Calcium
7) Nickel
8) Krypton
9) Bromine
10) Strontium
The complete question is,
Determine the elements denoted by the following electron configurations.
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A chemistry student as Agora is calculating the average atomic mass of potassium using the following data.
Isotope k-39 Relative abundance 93.12% atomic mass 38.964 amu.
Isotope k-41 Relative abundance 6.88% atomic mass 40.962 amu.
The student calculated the average atomic mass to be 40.823 amu but it is 39.098 amu on the periodic table. What did the student do incorrectly?
The student made a mistake in substituting the wrong values of the relative abundance of the isotopes Potassium-39 and Potassium-41. That is why his answer was wrong.
The student exchanged the values of the relative abundance of the isotope values. That is why it has resulted in the wrong value of the average atomic mass. On substituting the correct values using the following formula, we get the atomic mass of the respective isotopes as,
atomic mass = Mass x Relative abundance
atomic mass of K⁴¹₁₉ = 40.962 x 0.0688
the atomic mass of K⁴¹₁₉ = 2.8181856amu
Similarly, for the mass of K₃₉¹⁹ = 38.964 x 0.9312
= 36.28327amu
Thus the average atomic mass of Potassium is given by,
Average atomic mass of potassium = Mass of K₃₉¹⁹ + Mass of K⁴¹₁₉
The average atomic mass of potassium = 36.2832 +2.8181
The average atomic mass of potassium = 40.962amu
Hence, the correct value of the average atomic mass is thus obtained.
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Why does a solute depress the freezing point?
A) because the solute has bigger molecules than the solvent
B) because the solute disrupts crystal formation by the solvent
C) because the solute is colder than the solvent
D) because the solute tends to sink to the bottom of the solution
Answer: Option (B) is the correct answer.
Explanation: Freezing point depression is defined as the decrease in temperature of freezing of a solvent when a non-volatile solute is added into it.
This decrease in temperature arises because addition of solute particles into the solvent tend to disrupt the crystal formation of the solvents.
As a result, particles does not come closer to each other. Hence, we need to provide more lower temperature due to which there will be formation of crystal lattice in order to form the solid.
Thus, we can conclude that a solute depress the freezing point because the solute disrupts crystal formation by the solvent.
1. Although ethanol is used recreationally in moderation, it is a poison that
becomes lethal when you consume 5 to 8 g of the compound per kg of body
mass, a fact that is not emphasized enough on college campuses, where students
have tragically died from accidental alcohol overdoses. If a 120. 0 lb student
drank an entire 1. 00 L bottle of whiskey (80 proof; 40% ethanol by volume),
how would their consumption compare to the median lethal dose (7. 0 g/kg)?
(1 lb = 453. 59 g; ethanol density = 0. 789 g/cm³) You must use dimensional
analysis
After ingesting 1 L of 80-proof whiskey, the student's consumption of ethanol would, after the application of dimensional analysis, be 5.798 g of ethanol per kilogram of the body.
First, we calculate the mass of ethanol ingested by the student by using dimensional analysis. To do that, we must calculate its volume, which we can do using the total volume (1 L = 1000 mL) and alcohol volume percentage (40% = 0.40). When we have the volume in hand, we can calculate the mass of ethanol using its density (0.789 g/cm³ = 0.789 g/mL).
m(EtOH) = V(EtOH) * d(EtOH) = 0.40 * V(total) * d(EtOH) = 0.40 * 1000 mL * 0.789 g/mL = 315.6 g
So the student would ingest 315.6 g of ethanol. We can now divide that mass by the student's mass to calculate their consumption.
1 lb = 453.59 g = 0.45359 kg
315.6 g / (120.0 * 0.45359 kg) = 5.798 g/kg
This is dangerously close to the median lethal dose and definitely above the lower threshold of 5 g/kg, so the student would definitely be in danger of overdosing.
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3. Explain why it was significant that large numbers of other frogs and toads became extinct at the same time the golden toads disappeared.
Why are sodium (Na) and potassium (K) in the same group on the periodic table?
A They are both hard and brittle.
B They have similar reactivity.
C They are both colorless.
D They have similar atomic weights.
Sodium (Na) and potassium (K) in the same group on the periodic table because of option B They have similar reactivity.
The periodic table, also called the periodic table of the factors, is a tabular show of the chemical elements. it is broadly used in chemistry, physics, and other sciences, and is typically visible as an icon of chemistry.
Lithium, sodium, and potassium have the same wide variety of valence electrons i.e. 1, for this reason, they belong to the same organization. The institution is referred to as the alkali metals group because these kinds of elements shape oxides that dissolve in water to form alkali.
Potassium is observed clearly in lots of meals and as a complement. Its major position within the body is to assist maintain ordinary levels of fluid inside our cells. Sodium, its counterpart, keeps regular fluid ranges outdoors of cells. Potassium also helps muscles to settle and supports normal blood pressure.
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Question 3 please
How many mL of … are required…
Strong and Weak Foundations Bases provide a similar problem: a strong base is one that is completely ionized in solution.
What is true for a strong base?Strong and Weak Foundations Bases provide a similar problem: a strong base is one that is completely ionized in solution. A weak base is one that is less than 100% ionized in solution.
Acids and bases are incompatible. Acids and bases will balance one another out. A solution's pH can be changed by acids but not by bases. While bases give hydrogen ions (H+), acids give hydroxide ions (OH-).
The aqueous solution of the salt formed by neutralisation of weak acid and strong base possesses basic nature, while aqueous solution of salt produced by neutralisation of weak base and strong acid possesses acidic nature.
The complete question is:
A strong base or salt in solution exist predominately as electrons in solution.
a) True
b) False
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as you climb to the top of a hypothetical mountain in florida, air pressure decreases from 1 atm to 0.75 atm at the peak. what will the partial pressure of oxygen be at the top of the mountain?
As you climb to the top of a academic mountain in florida, air pressure decreases from 1 atm to0.75 atm at the peak. what will the partial pressure of oxygen be at the top of the mountain.
Pressure
Pressure( symbol p or P) is the force applied vertical to the face of an object per unit area over which that force is distributed.
Colorful units are used to express pressure. Some of these decide from a unit of force divided by a unit of area; the SI unit of pressure, the pascal( Pa), for illustration, is one newton per forecourt metre( N/ m2); also, the pound- force per forecourt inch( psi) is the traditional unit of pressure in the Homeric and U.S. customary systems. Pressure may also be expressed in terms of standard atmospheric pressure; the atmosphere( atm) is equal to this pressure, and the torr is defined as 1⁄760 of this. Manometric units similar as the centimeter of water, millimeter of mercury, and inch of mercury are used to express pressures in terms of the height of column of a particular fluid in a manometer.
Pressure is the quantum of force applied vertical to the face of an object per unit area. The symbol for it's" p" or P.( 2) The IUPAC recommendation for pressure is a lower- case p.( 3) still, upper- case P is extensively used. The operation of P vs p depends upon the field in which one is working, on the near presence of other symbols for amounts similar as power and instigation, and on writing style.
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A car was purchased in 2010 for $20,000. The car is depreciating by 15% each year. How much would the car be worth in 2020? What value do you use for T
The value of a car that was purchased in 2010 for $20,000 which is depreciating in value by 15% each year is $3937.49.
What will be the value of the car after 10 years if it depreciates by 15% every year?The value of the car will be found using the exponential decay model.
The formula of the exponential decay model is given as follows:
y = a (1 - r)ˣ
where;
y = the amount remaining
a = initial amount
r = decay rate
x = time period of decay
In the question above, a car was bought for $20000 in 2010.
The value of the car decays exponentially at a rate of 15% each year.
The time period between 2010 and 2020 is 10 years.
Considering the data given about the car:
a = $20000
r = 15% or 0.15
x = 10
Substituting the values in the decay formula:
y = 20000 (1 - 0.15)¹⁰
y = 20000 (0.85)¹⁰
y = $3937.49
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Question 1:
Moles - If a solution contains 0.02 g of Thiamine (vitamin B1) and has the molecular formula
C12H17N4OS
How many moles are present in the solution?
Explanation:
mole=mass/molar mass
molar mass of c12H17N4OS
12×12+17+14×4+16+32
=265
molar mass=265
mole=0.02/265
PLS HELP, I DIDN'T KNOW THIS WAS DUE UNTIL I CHECKED-AND IM WORKING ON MY OTHER 5 HOMEWORK ASSIGNMENTS, SO I DONT HAVE TIME TO DO THIS!!! I just need the answers you don't need to go into full detail! I'LL GIVE BRAINLIEST!!!
Proton has positive charge whereas neutron has no charge.
What are the difference between a proton and neutron?Proton is a type of subatomic particle that has a positive charge whereas Neutron is a type of subatomic particle that has no charge.
An atom that has lost one or more number of electrons is known as anion.
Isotopes is defined as an element that have the same number of protons i.e. atomic number but different numbers of neutrons i.e. mass number.
Electron is located outside the nucleus of an atom.
Fluorine is that atom which has 9 number of protons so its atomic number is 9.
Atomic number is related to the number of particles in the nucleus of an atom because in the nucleus, proton is present which shows the atomic number of an atom.
There are three parts of an atom i.e. proton, electron and neutron.
The size of electron is about 2 × 10⁻¹⁰ cm, The size of proton is about 0.84×10⁻¹³ cm and the size of neutron is about 1.7×10⁻¹⁵ meters
Electron has negative charge, proton has positive charge and neutron has no charge.
Yes, we can tell about the element if we know about the charge and the number of electrons in it because different atoms has particular number of electrons.
The diameter of a nucleus in scientific notation is 1.6 x 10⁻¹⁵.
The mass of hydrogen atom in whole number is 0.00000000000000000000000000167.
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According to the Law of Conservation of Matter, what happens to atoms during a chemical reaction?
1. More atoms are produced to form new substances.
2. Nothing; they stay the same.
3. The atoms are rearranged to form new substances.
4. Atoms are converted into energy during the chemical reaction.
Answer: 3. The atoms are rearranged to form new substances.
According to law of conservation of matter, atoms are rearranged to form new substances in a chemical reaction.
What is law of conservation of matter?According to law of conservation of matter, it is evident that matter can be neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of matter and energy are related as matter possesses mass and mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of matter is widely used in field of chemistry and fluid dynamics.
Law needs to be modified in accordance with laws of quantum mechanics under the principle of matter and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.
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N a p h, f a d h, and h 2 o enter the electron transport chain. o 2 and 32 a t p exit the electron transport chain. which change will correct this model of the electron transport chain? switch naph and 32 atp. switch fadh and 32 atp. switch h2o and o2. switch naph and o2.
The change will correctly effect the model of the electron transport system above simply is to switch H₂O and O₂ ( Water and oxygen ).
The correct answer choice is option c.
Switching water and oxygen molecules to effect a change where NAPH, FADH, and H₂O enter the electron transport chain.It happens that oxygen react with 2 different electrons from the transport chain and 2 hydrogen in order to produce water molecules in the process.
Electron transport chain simply refers to a protein complex redox reactions which result in the production of ATP molecules. In this whole process of forming ATP, the electrons in the chain carried by the NADH, FADH2 and H+· are transferred to oxygen atom.
In conclusion, for an effective change to occur in the above electron transport system, there needs to be a switch of water and oxygen molecules
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Answer :Switch H2O and O2.
Explanation: edgenuie 2022-23
HELP BRIANLIEST AND 30 POINTS
If the density of an object is greater than 1 g/ml, what does that mean?
Group of answer choices
The object is heavier than gold
The object will float in water
The object will either sink or float in water depending on its size
The object will sink in water
If the density of an object is greater than 1 g/mL, the object will sink in water (option D).
What is density?Density of a substance can be defined as the measure of the mass of matter in the substance contained by a unit volume.
The density of a substance is a determinant of whether or not the substance will float or sink in a liquid substance like water.
This means that an object will float in water if it has a density less than water but will sink if it has a density higher than water.
Since the density of water is 1g/mL, therefore, an object with density greater than 1g/mL will sink in water.
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