Answer Explanation:
A reasonable conclusion about the Arctic ecosystem based on the information provided is that the melting of the Arctic sea ice is negatively impacting the ability of seals, sea birds, and polar bears to find food and shelter and to raise their young. This melting is likely to have other impacts on the ecosystem as well, such as changes in the distribution and abundance of other species that depend on sea ice for their survival. Overall, the melting of the Arctic sea ice is likely to have significant and potentially detrimental effects on the Arctic ecosystem and the organisms that live there.
a 500. gram iron ore sample was determined to contain 242 grams of iron. what is the mass percent of iron in the ore? a 500. gram iron ore sample was determined to contain 242 grams of iron. what is the mass percent of iron in the ore? 51.6 48.4 32.6 93.7 none of the above
242 grams more iron were found to be present in a 500 gram sample of iron ore. 48.4 mass percentage of iron is present in the ore.
To get the mass percent of a component of a compound, divide the result by 100 after dividing the mass of the component in 1 mole of a complex by the compound's molar. Although certain ores include quite so much as 66 % iron, the majority are in the 50–60 %, making deposits with less that 30 % iron commercially unappealing. The other components of an ore, referred to as gangue as a whole, can also affect the quality of the ore. 60% to 70% of haematite is made entirely of iron ore. 40% to 60% of limonite is pure iron. Siderite only contains 40% - 50% pure iron and is heavily contaminated. Iron ore in haematite is 60–70% pure iron. In limonite, there is 40–60% pure iron. Siderite has several impurities.
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What do subscripts explain in a chemical formula?
A)the number of bonds for each ion present
B)the number of atoms for each element present
C)the charge of each ion present
D)the chemical symbol for each element present
which technology is used to measure the mass of atoms and to determine the percent composition of compounds? choose the correct answer.
However, a tool known as a mass spectrometer allows scientists to quantify relative atomic masses with extreme accuracy.
Why is it necessary to know what percentages make up a compound?Chemists frequently need to know which components are in a compound and in what proportions. A specific element's mass in any mass of the compound can be calculated using the percent composition as well. Because the two percentages total up to 100%, the calculations make sense.
The significance of mass percent.With the aid of this formula, one can determine the lowest entire number of moles and the proportional number of atoms of each element present in a compound. The true molecular formula can be calculated by chemists using the empirical formula.
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How many times bigger is the radius of a helium atom than the radius of an alpha particle.
The radius of a helium atom is 4.8 times the radius of an alpha particle.
What is alpha particle?
Alpha particles, also called alpha rays and alpha radiation, have a structure similar to that of the helium-4 nucleus, consisting of two protons and two neutrons bonded together.
What is helium?
Helium has been used as an inert gas environment for welding metals such as aluminum. It is also used for rocket propulsion.
The radius of a helium atom is 4.8 times the radius of an alpha particle. The diameter of the nucleus of the helium atom, an alpha particle, was also measured more accurately than ever before. The results only show a size of 1.6782 femtometers, making him 4.8 times more accurate than previous measurements.
Therefore, The radius of a helium atom is 4.8 times the radius of an alpha particle.
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write the equation for the reaction that will occur when each pair of substances is allowed to react. a. hbr and mg(oh)2 b. h3po4 and koh c. h2so4 and nh4oh
The equation for the reaction that will occur when each pair of substances is allowed to react:
a) 2HBr+ Mg(OH)2⇒MgBr2+2H2O
b) H3PO4+KOH⇒KH2PO4+H2O
c)NH4OH+H2SO4⇒(NH4)2SO4+2H2O
What is neutralisation reaction?
When an acid and a base interact chemically, the process is known as neutralisation or neutralisation. In a process in water, neutralisation leaves the solution with no excess of hydrogen or hydroxide ions.
In all three reactions acid reacts with base to produce salt and water.
Acid+Base⇒Salt+Water
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NEED ANSWERED ASAP
An ideal gas is at volume V at temperature T. If the volume is doubled at constant pressure and the same amount of gas particles, the temperature will be
unchanged
halved
doubled
four times
Considering the Charles's law, the correct answer is the third option: if the volume is doubled at constant pressure and the same amount of gas particles, the temperature will be doubled.
Charles' lawCharles' law establishes the relationship between the temperature and the volume of a gas when the pressure is constant. Jack Charles observed that when the temperature was increased the volume of the gas also increased and that as it cooled the volume decreased. That is, the volume is directly proportional to the temperature of the gas.
Mathematically, Charles' law states that if the amount of gas and the pressure remain constant, the ratio between the volume and the temperature always has the same value:
V÷T=k
where:
V is the volume.
T is the temperature.
k is a constant.
Considering an initial state 1 and a final state 2, it is fulfilled:
V₁÷T₁= V₂÷T₂
This caseIn this case, the volume is doubled at constant pressure and the same amount of gas particles. This is, V₂= 2×V₁
Replacing in the Charles' law:
V₁÷T₁= 2×V₁÷T₂
(V₁÷T₁)×T₂= 2×V₁
T₂= 2×V₁ ÷(V₁÷T₁)
T₂= 2×T₁
Finally, the temperature will be doubled.
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Which is the best CONDUCTOR: a metal spoon, a plastic spoon, or a wooden spoon?
The distance to the moon is 238,855 miles. How many meters is this? Record your answer in scientific notation.
Answer:
384399861 meters
Explanation:
what is the definition of equilibrium? do chemical reactions stop occurring once cquilibrium is reached?
a situation when opposing forces or actions are in equilibrium, whether that balance is static (such as when forces are applied to a body and the resultant is zero) or dynamic (such as in a chemical process that is reversible when the velocities in both directions are equal): a condition of mental or emotional equilibrium.
What is a simple definition of equilibrium in chemistry?
When the rates of the forward and backward reactions are identical, chemical equilibrium is reached. In other words, there is no net change in the reactant and product concentrations.
Equilibrium in chemicals is a dynamic process. Even after equilibrium has been attained, the forward and reverse reactions still happen. However, for a reaction that is at equilibrium, there is no change in the relative concentrations of reactants and products because the reaction rates are the same.
The reaction, though, continues unabated. Instead, the process reaches a state of chemical equilibrium where the forward reaction is producing products as quickly as the reverse reaction is converting reactants into products.
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in the retrosynthetic analysis of the given target molecule, which disconnection leads to an epoxide starting material
Retrosynthetic analysis is a method for resolving issues with organic syntheses' planning. To do this, a target molecule is converted into less complex precursor structures.
What kind of chemical does retrosynthesis target?The molecule whose synthesis is being planned is known as the target molecule. Deconstructing a target is the process of retrosynthesis.
Which of the following name reactions is used in the provided synthesis for FGI?One of the most typical methods in synthetic chemistry is functional group interconversion (FGI) reactions. Cinnamic aldehyde is converted into two distinct products in this experiment by reduction with LiALH4, depending on the sequence in which the reactants are added.
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If the temperature of a gas in a 2.0 L sealed container with variable volume is doubled, what will the volume of the container increase to?
Answer:
look below
Explanation:
If the temperature of a gas in a sealed container with a fixed number of molecules is increased, the gas will expand. This is because the increased temperature will cause the gas molecules to move more quickly and collide more frequently with the walls of the container. These collisions will exert a greater force on the walls of the container, causing the volume of the container to increase.
If the volume of the container is allowed to vary (i.e., if it is not sealed), then the volume of the container will increase as the temperature is increased. The exact increase in volume will depend on the size of the container and the specific gas that is being heated.
If the temperature of a gas in a 2.0 L sealed container is doubled, the volume of the container will increase, but it is not possible to determine the exact increase in volume without knowing the specific gas that is being heated and the pressure and temperature at which the gas was originally contained.
Hellllllllpppppppppp
what is the maximum mass of magneium metal should be used in its reaction with hcl so that the total pressure does not exceed 1.5 atm
The maximum mass of magnesium used in its reaction with HCl is 0.08gm so the total pressure does not exceed 1.5 atm.
We will use ideal gas laws to solve this
For the final pressure, P = 1.5 atm
Change in pressure = 1.5-1
= 0.5 atm
Volume = 0.161L
T= 298K
What are ideal gas laws?The equation of state for a synthetic perfect gas is known as the ideal gas law, sometimes known as the generic gas equation. Although it has significant drawbacks, it is a decent approximation of the behavior of many gases under various conditions.
Only an ideal gas or a real gas that behaves enough like an ideal gas can be approximated by the equation of state presented here (PV = nRT). The equation of state can be expressed in a wide variety of ways.
Calculation:Let the moles of H, produced then
Using ideal gas law
P×V= n×R×T
0.5 × 0.161 = n × 0.0821 × 298
n=0.00329
Mg+ 2HCl⇒ Mg.Cl2 + H₂
Moles of H, 0.00329 1 mole of Mg gives 1 mole of H
Therefore, number of moles of Mg-0.0329
Mass of Mg=0.00329 × 24.3
Mass of Mg=0.08 gm
The maximum mass of magnesium used in its reaction with HCl is 0.08gm so the total pressure does not exceed 1.5 atm.
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Facilitated diffusion is used to transport
sugars and amino acids.
H2O and O2.
CO2 and O2.
CO2 and H2O.
sugars and H2O.
Water(h2o), carbon dioxide(co2), and oxygen(o2) can move through a plasma membrane by simple diffusion.
What is simple diffusion in plasma membrane?Na+ is the substance which would have the most trouble crossing a biological membrane through diffusion.Consider substances like carbon dioxide and oxygen (O2) that can easily travel through the lipid bilayer of a cell membrane (CO2). These minute, lipid-soluble gas molecules and other small particles can diffuse in the membrane and migrate along a gradient of concentration to enter or exit the cell.Simple diffusion is a type of passive transport where molecules move across a cell membrane from This is the movement of a substance from a region of higher concentration to that of a lower concentration.Polar and charged substances typically have most difficulty passing through a lipid bilayer due to repulsive actions thereby making option D the most appropriate choice.one side where they are more concentrated to the other. O2 often diffuses into cells because it is more concentrated outside of them, and CO2 usually diffuses out of cells because it is more concentrated inside.Facilitated diffusion therefore allows polar and charged molecules, such as carbohydrates, amino acids, nucleosides, and ions, to cross the plasma membrane. Two classes of proteins that mediate facilitated diffusion are generally distinguished: carrier proteins and channel proteins.To learn more about amino acids refer to:
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if you have an atom from group 2 of the periodic table, and it reacts with an atom from group 17 of the periodic table, what is the general formula?
When an atom from group 2 of the periodic table(say X) reacts with an atom of group 17(say Y), then the general formula is XY₂.
The elements present in group 2 of the periodic table (Be, Mg, Ca, Sr, Ba, Ra) are metals having valency 2. On the other hand, the elements present in group 17 ( F, Cl, Br, I, At, Ts) are halogens or non-metals having valency 1. So, elements from both these groups combine together by transfer of electrons, forming an ionic bond between them.
The general formula is formed by exchange of valencies.
here, valency of X=2, Y=1
Thus, the general formula is XY₂
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for a radical addition reaction involving hbr and propene, sort each reaction step into initiation, propagation and termination steps.
comprises start, propagation, and termination for a radical addition reaction employing HBr and propene. The following is the reaction:
----> CH3CH=CH2 + HBr + peroxide CH₃CH₂CH₂Br
1) The following actions are included in the initiation steps:
RO - RO ——> ----> 2RO° RO° + H- Br ROH + Br°
2) The propagation steps that are involved in this step are:
CH2 + Br° = CH3 - CH — CH3, CH2, and CH2Br
----> CH3 - °CH - CH2 - Br + H - Br Br + Br° CH3 - CH2 - CH2 -
3) The final phase consists of:
Br° + Br° ——> Br - Br\s2 Br --->
CH3 - °CH - CH2 - CH3, CH2, CH2, and Br
|
CH3, CH2, CH2, and Br
Br + Br° ---> CH3 - °CH - CH2 - CH3 - CH - CH2 - Br | Br
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the highest value in the blosum62 matrix is 11 for (w, w). what does this tell us about the amino acid represented by w (tryptophan)?
The highest value of the blosum62 matrix for Tryptophan amino acids depicts that this amino acid is conserved when two proteins are aligned.
What is the Blosum62 scoring matrix?For BLASTP, the default scoring matrix is the BLOSUM62 matrix. By examining the rates of amino acid alterations in collections of related proteins, the BLOSUM62 matrix was created. When two proteins were aligned, the amino acid sequences inside each cluster, or block, were at least 62% identical. Researchers computed the rates of all amino acid changes that have taken place in these conserved protein building blocks. The BLOSUM62 score matrix for amino acid substitutions was subsequently created using this data. Cysteine, tryptophan, and histidine, which have the highest scores, are the amino acids that are most highly conserved.
What is Amino acid?The building components of protein are amino acids. A hydrogen atom, a basic amino group, a carboxylic acid group, a side-chain group, and an R-group are all connected to the core carbon atom of each molecule. The R-group distinguishes amino acids from one another.
Hence, the highest value of the blosum62 matrix for Tryptophan amino acids depicts that this amino acid is conserved when two proteins are aligned.
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lewis structures are a simple shorthand representation of the bonding of atoms and the distribution of ___________ electrons in molecules and polyatomic ions of the main-group elements.
Lewis structures are a simple shorthand representation of the bonding of atoms and the distribution of Valence electrons in molecules and polyatomic ions of the main-group elements.
What are valence electrons?The electrons in an atom's outer shells, or energy level, are called valence electrons. For instance, the valence electrons of oxygen are six, with 2 with in 2s subshell and 4 with in 2p subshell. The valence electron configuration of oxygen can be expressed as 2s²2p4.
What distinguishes valence electrons from regular electrons?Core electrons are those in filled orbitals that are located closest to the nucleus. Valence electrons are simpler to separate than core electrons because they are away from the positive ion (the proton) and so require less energy to travel out from the atom than core electrons.
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The table compares some characteristics of two atoms.
Charged Particles
Atom Number of Neutrons Mass Number
X
Y
6
7
12
13
Which of the following is true about the two atoms?
O Atom X and Atom Y are in the same row, but not the same family, on the periodic table.
O Atom X and Atom Y occupy the same position in the periodic table because they are isotopes.
O Atom X is in a column to the right of Atom Y in the periodic table.
O Atoms X and Atom Y are in the same family, but not the same row, in the periodic table.
The true statement about the two atoms X and Y is
Atom X and Atom Y occupy the same position in the periodic table because they are isotopes.The correct option is B.
What are the atomic number and mass number of the given atoms?The atomic number is the difference between the mass number and the neutron number.
Atomic number = mass number - neutron number
The atomic number and mass number of the given atoms X and Y are as follows:
Atom X:
mass number = 12,
neutron number = 6
atomic number = 12 - 6
atomic number = 6
Atom Y:
mass number = 13
neutron number = 7
atomic number = 13 - 7
atomic number = 6
X and Y have the same atomic number but different mass numbers. Hence, they are isotopes.
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Aume that 437. 7 j of heat i added to 5. 00 g of water originally at 23. 0C what would be the final temperature of the water
The final temperature of the water is 43.92°C.
What is specific heat capacity?
The specific heat is defined as amount of energy in the form of heat to change heat content of 1 gram of substance by one-degree Celsius temperature.
Specific heat capacity of water = 4.184J/g°C
heat (q) = 437.7 J
Initial temperature = 23°C
Final temperature = T
mass of water = 5.00g
using the equation: q= mₓcₓΔT
437.7 = 5ₓ4.184ₓ(T- 23.0)
(T-23.0) = 437.7/ (5ₓ4.184)
T= 23.0°C +20.92°C = 43.92°C
T= 43.92°C
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Which of the following elements has the same number of valence electrons as the element boron
Answer:
Boron and argon have 3 and 8 valence electrons respectively.
Aluminum and calcium have 3 and 2 valence electrons respectively.
Explanation:
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cirlce the major conformer in each of following equilibria. please put explanations that i can understand thank you
The major conformer in ethane is Eclipse Conformation. Another clockwise rotation at an angle of 60 degrees would lead to second eclipsed conformation.
What is ethane?
Ethane turned into first synthesized in 1834 by using Michael Faraday, making use of electrolysis of a potassium acetate answer. He mistook the hydrocarbon manufactured from this response for methane and did no longer check out it further.Throughout the duration 1847–1849, that allows you to vindicate the radical principle of organic chemistry, Hermann Kolbe and Edward Frankland produced ethane.They mistook the product of those reactions for the methyl radical (CH3), of which ethane (C2H6) is a dimer.Ethane takes place as a trace gas in the Earth's surroundings, presently having a concentration at sea stage of 0.five ppb, although its pre commercial awareness is likely to were only round 0.25 component according to billion.To know more about ethane, click the link given below:
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Pls help with this question!!
Zinc sulfate is an ionic compound formed between one atom of zinc and one copy of the polyatomic ion sulfate, which contains one atom of sulfur and four atoms of oxygen. The molar mass of zinc sulfate is calculated above.
What percent of the mass in a sample of zinc sulfate comes from the zinc?
The percent of the mass in a sample of zinc sulfate that comes from zinc would be 40.50%. Option 5.
Percent CompositionThe percent composition of a component in a substance is the ratio of the mass of the component and the mass of the substance itself.
This can be mathematically expressed as;
Pecent composition= mass of component/mass of substance x 100%
In this case, the substance is zinc sulfate, a compound that contains zinc, sulfur, and oxygen in a ratio 1:1:4.
The molar weight of zinc is 65.38 while the molar mass of the entire zinc sulfate is 161.442.
Thus, the percent of the mass of any sample of zinc sulfate that comes from zinc would be:
Percent zinc = 65.38/161.442 x 100
= 40.50%
In other words, the percent of zinc in any zinc sulfate sample would be 40.50%
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What is the equation for finding the mass of a system
The equation for finding the mass of a system is:
mass = density x volume
where density is the mass per unit volume of a substance, and volume is the amount of space that a substance occupies.
To use this equation, you need to know the density and volume of the substance in question. For example, if you have a block of iron with a density of 7.8 g/cm^3 and a volume of 50 cm^3, you can find its mass using the equation above:
mass = density x volume
= 7.8 g/cm^3 x 50 cm^3
= 390 g
This means that the mass of the block of iron is 390 grams.
Write the balanced NET ionic
equation for the reaction when
aqueous Cs3PO4 and aqueous
AgNO3 are mixed in solution to
form solid Ag3PO4 and aqueous
CsNO3 Be sure to include the
proper phases for all species
within the reaction.
The balanced NET ionic equation for the reaction when aqueous Cs₃PO₄ and aqueous AgNO₃ are mixed in solution to form solid Ag₃PO₄ and aqueous CsNO₃ is: PO₄³⁻(aq.) + 3Ag⁺(aq.) → Ag₃PO₄ (s)
What is ionic equation?If the electrolytes in an aqueous solution are stated as dissociated ions in a chemical equation, the equation is known as an ionic equation.
In this case, since the net ionic equation of a chemical reaction shows up the ionic species that result from the simplification of the spectator ions, which are those at both reactants and products sides, we take into account that aqueous species ionize into ions whereas liquid, solid and gas species remain unionized. In such a way, for the reaction of cesium phosphate and silver nitrate. The equation becomes:
Cs₃PO₄ (aq.) + 3AgNO₃ (aq.) → Ag₃PO₄ (s) + 3CsNO₃ (aq.)
Whereas the three aqueous salts are ionized in order to write the following complete ionic equation:
3Cs⁺(aq.) + PO₄³⁻(aq.) + 3Ag⁺(aq.) + 3NO₃⁻(aq.) → Ag₃PO₄(s) + 3Cs⁺(aq.) + 3NO₃⁻(aq.)
In such a way, since the cesium and nitrate ions are the spectator ions because of the aforementioned, the net ionic equation turns out:
PO₄³⁻(aq.) + 3Ag⁺(aq.) → Ag₃PO₄ (s)
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What will a hurricane do when it hits landfall
A.It will weaken
B.It will get stronger
C.It will not change
(HELP ASAP)
Answer:
A
Explanation:
because it doesn't have the ocean water to gain energy
substituting residues in a peptide with which amino acid will most likely result in a peptide with an increased pi?
It has been established that a similar substitution, in which glutamate is switched out for lysine, can lead to mutant proteins that are less stable as dimers or less capable of binding DNA.
What happens if valine is used instead of glutamic acid?A nucleotide error that results in the synthesis of aberrant beta-chains in hemoglobin S, the single amino acid substitution of valine for glutamic acid in the beta-chain that causes sickle cell anemia.
Which four substituents are present on all amino acids?In amino acids, the four valency positions of the core carbon atom are occupied by four substituent groups (alpha carbon). These include the following: hydrogen, carboxyl group, amino group, and a variable group known as the R group. As a result of the substituent, amino acids are also known as substituted methanes.
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HELP ASAP URGENT WILL GIVE BRAINIEST (CORRECT ANSWERS ONLY!!!!!) What mass of H2 forms when
35.25 g Al reacts with excess
hydrochloric acid?
2AI + 6HCI → 2AICI3 + 3H2
Al: 26.98 g/mol
H2: 2.02 g/mol
?] g H2
According to the mass ratio 3.51 g of H₂ were produced.
What is a reaction's mass ratio?The ratio between the masses of the reactants and products in a reaction's balanced equation is known as the mass ratio.
Example for mass ratio: calculate the amount of copper per unit of chlorine for each compound by dividing the mass of copper by the mass of chlorine. The ratio of the copper masses in the two compounds can then be calculated by dividing the larger value by the smaller value.
The reaction's equation is provided below;
2 AI + 6 HCI → 2 AICI₃ + 3 H₂
From the reaction equation, 2×27 g of Al produces 3×2 g of H₂
32.25 g of Al will produce: 6/55× 32.25 g of H₂
Consequently, the amount of H₂ produced is 3.51 g of H₂.
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Which phrase describes a risk of using the radioisotope co-60 in treating cancer.
The phrase that describes a risk of using the radioisotope Co-60 in treating cancer is "increased biological exposure".
Use of Co-60 in treatment of cancer
The medical use of gamma rays from the radioisotope cobalt-60 to treat conditions such as cancer is known as Cobalt therapy. In the early 1950s, cobalt-60 was widely used in external beam radiotherapy (teletherapy) machines, which produces a beam of gamma rays which was directed into the patient's body to kill tumor tissue and treat cancer.
Hence, the use of Co-60 is now-a-days importantly used to treat conditions like cancer and the phrase used is "increased biological exposure".
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All plants and animals use the process of choose. To obtain energy from food. This process begins in the choose. , where glucose is broken down into smaller molecules to produce energy. The second part of the process takes place in the choose. . Here the molecules are broken down further and produce choose. As a waste product. In addition, the second part of the process requires choose. In order to function.
Oxygen can be present or absent during cellular respiration. Because the cell appears to breathe in molecular oxygen and exhale carbon dioxide, the process is known as cellular respiration.
What are molecules called?Any atoms joined by chemical bonds are referred to be molecules in general. A molecule is made up of any two atoms together. A molecule consisting of atoms from various elements is referred to as a compound. Although all molecules are compounds, not all compounds are molecules.
What three molecules are necessary for all life?Nucleic acids, lipids, proteins, and carbohydrates make up the four basic building blocks of life. Each and every one of the 4 categories is essential for every living thing on Earth. A cell or organism could not survive without any one of these four molecules.
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