True or false: carbon is found only in biotic matter
Answers
Answer:
Instead, the following essential substances are also a component of biogeochemical cycles and keep our bodies functioning: All organic macromolecules contain carbon, which is also a crucial component of fossil fuels. For further information, see the carbon cycle article.
Explanation:
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Related Questions
To find the percentage yield for a reaction, you take the___ and divide by the___and ___
multiply by____
PLEASE HELP ME
Answers
To the percentage yield for a reaction, you take the actual yield and divide by the theoretical yield and multiply by 100.
What is percent yield?Yield also referred to as reaction yield in chemistry, is a measure of the quantity of moles of a product formed in relation to the reactant consumed and expressed as a percentage.
Percent Yield is defined as the actual yield divided by the theoretical yield times 100 i.e.
Percent yield = actual yield/theoretical yield × 100
The percent yield is determined by calculating the ratio of actual yield/theoretical yield.
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How many formula units of CaF2 are in 15 grams of CaF2
Answers
15 grams of CaF2 is equal to 0.844 moles. Therefore, there are 0.844 moles of CaF2, or 6.752 formula units of CaF2.
How much heat is absorbed when 40.00 g of C( s) reacts in the presence of excess SO 2( g) to produce CS 2( l) and CO( g) according to the following chemical equation? 5 C(s) + 2 SO2(g) → CS2(l) + 4 CO(g)ΔH° = 239.9 kJ
Answers
159.77kJ
Explanations:Given the balanced chemical reaction between carbon C(s) and SO2(g) expressed as:
\(5C\mleft(s\mright)+2SO_2\mleft(g\mright)\to CS_2\mleft(l\mright)+4CO\mleft(g\mright);\text{ }\Delta H\degree=239.9kJ\)First, we need to get the number of moles of Carbon present using the formula;
\(\begin{gathered} \text{Moles =}\frac{Mass}{molar\text{ mass}} \\ \text{Moles of C=}\frac{40.0g}{12gmol^{-1}} \\ \text{Moles of C = }3.33\text{moles} \end{gathered}\)According to the reaction, 5 moles of carbon reacts to produce 239.9 kJ of heat.
To determine how much heat will be produced by 3.33 moles of Carbon, this will be expressed as:
\(\begin{gathered} H_c=\frac{3.33\text{moles}}{5\text{moles}}\times239.9kJ \\ H_c=\frac{798.867}{5}kJ \\ H_c=159.77kJ \end{gathered}\)Hence the amount of heat absorbed when 40.00 g of C( s) reacts in the presence of excess SO 2( g) to produce CS 2( l) and CO(g) is 159.77kJ
During an experiment, solid iodine was placed in a sealed container. The container was gradually heated and purple-colored vapors of iodine formed were observed. Describe this system when it reaches phase equilibrium. (10 points)
Answers
Answer:
See explanation
Explanation:
For a chemical system in a state of dynamic equilibrium, the rate of forward reaction is equal to the rate of reverse reaction.
For this system under consideration;
I2(s)⇄I2(g)
When we heat the container, solid iodine is converted into purple coloured iodine vapour.
When equilibrium is achieved in the system, there will be no net change in the amount of solid iodine and iodine vapour present in the system since the rate of forward and reverse reactions are equal for a system in a state of equilibrium.
what is the percent yield of b in a reaction that uses 25.0 g of starting material a, has theoretical yield of 2.0g of b, and an actual yield of 17.0 g of b
Answers
The percent yield of b in a reaction that uses 25.0 g of starting material a, has a theoretical yield of 2.0g of b, and an actual yield of 17.0 g of b is 11.764%
The percentage yield is experimental to theoretical yield divided by 100
Theoretical yield of 2.0g of b, and an actual yield of 17.0 g of b
So % yield is 2/17x100=11.764
The ratio of the experimental yield to the theoretical yield multiplied by 100 gives the percentage yield of a chemical reaction. Generally, the value of percentage yield is less than 100 percent since the actual yield produced after the reaction is frequently smaller than the theoretical value.Learn more about percentage yield at:
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Name a substance which will undergo changes from solid to liquid to gas between 0c and 100c
Answers
Answer:
WATER
Explanation:
Water melting point 0 c boiling 100c
Which set of elements makes up 95% of the Earth A Iron, Calcium, Silicon and Carbon Oxygen, Carbon, Silicon and Iron C Oxygen, Magnesium, Iron and Silicon D Hydrogen, Helium, Silicon and Carbon
Answers
Oxygen, Magnesium, Iron, and Silicon are the set of elements that makes up 95% of the Earth. Among these Oxygen is the most abundant element, comprising about 47% of the Earth's mass.
These four elements make up approximately 95% of the Earth's composition. Oxygen is the most abundant element, comprising about 47% of the Earth's mass. Magnesium, Iron, and Silicon are also significant constituents, with Magnesium accounting for about 27%, Iron for approximately 6%, and Silicon for around 8% of the Earth's composition.
While Carbon is indeed an essential element for life and is present in various forms on Earth, its abundance in the Earth's overall composition is relatively low compared to Oxygen, Magnesium, Iron, and Silicon. Hydrogen and Helium, mentioned in option D, are lighter elements and are more prevalent in the composition of the Sun and other celestial bodies, rather than the Earth itself.
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what is the molar mass of a gas with a density of 7.2 g/l at a temperature of 298 k and a pressure of 2.75atm
Answers
The molar mass of the gas is "64.23g/mol".
Molar mass is the weight in grams of one mole of a substance. Every element has a distinct molar mass of their own. For instance, the molar mass of magnesium is 24.3050 g/mol and that of carbon is 12.011 g/mol.
The sum of the atomic masses of all the atoms in a molecule or compound in one mole is the substance's molar mass. The atomic masses of all the atoms that make up a molecule or compound are added together to form the substance's molecular mass.
In starting, the volume of the gas can be calculated by using ideal gas equation.
For 1 mole of a gas, n = 1, R = 0.0823 \(l.atm/mol.K\)
So,
PV=nRT
V=nRT/P
\(\\=\frac{1*0.0823*298}{2.75} \\=8.918\)
And Molar mass
m= d*V
\(\\=7.2*8.918\\=64.2096\)
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which property of water allows it to dissolve many substances?
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The property of water that allows it to dissolve many substances is its polarity.
What is polarity?
Polarity refers to the distribution of electrical charge in a molecule. A polar molecule has an uneven distribution of electrons, resulting in a partial positive charge on one end of the molecule and a partial negative charge on the other end. This creates a dipole moment in the molecule.
Water molecules are polar, meaning that the electrons in the molecule are not distributed evenly, resulting in a partial positive charge on one end of the molecule and a partial negative charge on the other end.
This polarity allows water molecules to form hydrogen bonds with other polar or charged molecules, such as ions and polar compounds. This type of bonding allows many substances, such as salt and sugar, to dissolve in water.
Additionally, the polarity of water molecules also allows them to interact with nonpolar substances through London Dispersion Forces, which also allows some nonpolar substances to be dissolved in water.
Hence, the polarity of water allows it to dissolve many substances.
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how many lone pair of electrons are assigned to the fluorine atom in the lewis dot structure of hypofluorous acid, hof?
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The fluorine atom in the Lewis dot structure of hypofluorous acid, HOF, has 3 lone pairs of electrons. Here is the Lewis dot structure of hypofluorous acid: H - O - F.
About Lewis dotIn the Lewis dot structure of hypofluorous acid, HOF, the fluorine atom has 3 lone pairs of electrons. To determine the number of lone pairs of electrons assigned to the fluorine atom, we need to look at the Lewis dot structure of hypofluorous acid. The Lewis dot structure is a diagram that shows the arrangement of atoms and the distribution of electrons in a compound.
Each dot represents an electron, and the lines represent the bonds between the atoms. In the Lewis dot structure of hypofluorous acid, the hydrogen atom is bonded to the oxygen atom with a single bond, and the oxygen atom is bonded to the fluorine atom with a single bond. The fluorine atom has 7 valence electrons, 2 of which are used in the bond with the oxygen atom. This leaves 5 electrons, which are arranged in 3 lone pairs around the fluorine atom.
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PLEASE HELP
I WILL GIVE BRAINLIEST
Answers
the law of definite proportions states that substances combine in predictable proportions and that excess reactants remain unchanged. true false
Answers
Using the concepts of Avogadro Law, we got the given statement is true.
The law of definite proportions defines samples of a compound will always contain the same proportion of the elements by mass. The mass ratio of elements is fixed no matter where the elements comes from, how the compound is prepared. Essentially, the law is based on fact that an atom of a particular element is the same as any other atom of that element. So, an atom of oxygen is same, whether it comes from silica or oxygen in the air.
The Law of Constant Composition is equivalent to definite proportions, which states each sample of a compound has the same composition of elements by mass.
The law of definite proportions actually tells water will always contain 1/9 hydrogen and 8/9 oxygen by mass.
The sodium and chlorine in table salt combine according to the rule and become NaCl. The atomic weight of sodium is 23grams and that of chlorine is about 35grams, so from the law one may conclude dissociating 58 grams of NaCl will produce about 23 g of sodium and 35 g of chlorine.
Hence, it is true that the substances combine in predictable proportions and that excess reactants remain unchanged.
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Matter changing from a solid to a liquid is called
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What are the function of the cytokinesis hormone in plant's. Choose the correct answer
A ) ! ck jd pyk v zc !
B ) ! ck jd pyk v zc !
Answers
These are some of the important functions of the cytokinesis hormone in plants :-
Cytokinesis is a group of growth regulators that is found in plants. It helps in performing cell divison of plant roots, and shoot system. It also helps in promoting the cell's growth, development, flowering, and seed formation.
It helps in the protein production which is important for mitosis. It provides resistance against certain diseases causing bacteria in crops. It mainly contains Nitrogen, Hydrogen, and a few atoms of oxygen in its structure.
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The options for the function of cytokinesis should be:
(A) performing cell division in plant roots
(B) shoot system
(C) promoting the cell’s growth, development
(D) All of these
Answer - (D) All of these
When gaseous nitrogen and gaseous hydrogen are reacted at high temperatures in the presence of a catalyst, ammonia (and no other product) is formed. If a chemical plant has to synthesize 250 kg of ammonia, what mass (in kilograms) of hydrogen has will be required, assuming 100% yield
Answers
To synthesize 250 kg of ammonia with 100% yield, the chemical plant will require 750 kg of gaseous hydrogen.
The balanced chemical equation for the synthesis of ammonia is N₂ + 3H₂ → 2NH₃, which means that for every 1 mole of nitrogen gas (N₂) reacted, 3 moles of hydrogen gas (H₂) are required. The molar mass of nitrogen gas is 28 g/mol, and the molar mass of hydrogen gas is 2 g/mol. Therefore, to produce 250 kg of ammonia, we need to calculate the number of moles of nitrogen gas required and then use the balanced chemical equation to determine the amount of hydrogen gas needed.
The mass of 1 mole of nitrogen gas is 28 g, so 250 kg of ammonia is equivalent to (250,000 g)/(17 g/mol) = 14,706.5 moles of ammonia. From the balanced chemical equation, we know that 1 mole of nitrogen gas reacts with 3 moles of hydrogen gas to produce 2 moles of ammonia. Therefore, we need (14,706.5 moles of ammonia) x (1 mole of nitrogen gas/2 moles of ammonia) x (3 moles of hydrogen gas/1 mole of nitrogen gas) x (2 g/mol) = 22,060 kg of hydrogen gas.
To synthesize 250 kg of ammonia with 100% yield, the chemical plant will need 750 kg of gaseous hydrogen.
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A flask is charged with 0.124 mol of A and allowed to react to form B according to the reaction A(g) \rightarrowB(g). The following data are obtained for [A] as the reaction proceeds: Time (s) 1 10 20 30 40 Moles of A 0.124 0.110 0.088 0.073 0.054 How many moles of B are present at 10 s
Answers
The moles of B formed at t = 10 s are 0.014 mol.
To determine the number of moles of B present at 10 seconds, we need to analyze the data provided for the reaction.
The given data shows the moles of A as the reaction proceeds. We can observe that as time progresses, the moles of A decrease. This indicates that A is being consumed and converted into B.
At t = 1 s, the flask is initially charged with 0.124 mol of A. As the reaction proceeds, the moles of A decrease over time.
Given that at t = 10 s, the moles of A are 0.110 mol, we can calculate the moles of B formed at that time.
Since the reaction stoichiometry is given as A(g) → B(g), we can assume that the moles of A consumed will be equal to the moles of B formed.
The initial moles of A at t = 1 s are 0.124 mol, and at t = 10 s, the moles of A are 0.110 mol. Therefore, the moles of A consumed from t = 1 s to t = 10 s can be calculated as:
Moles of A consumed = Initial moles of A - Moles of A at t = 10 s
= 0.124 mol - 0.110 mol
= 0.014 mol
Since the moles of A consumed are equal to the moles of B formed, the moles of B formed at t = 10 s are 0.014 mol.
Therefore, at 10 seconds, there are 0.014 mol of B present.
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PDB CODE: 1MRY SEQUENCE POSITION: 229 AMINO ACID MUTATED TO: ARG In the PDB protein, you were given the sequence position of a particular amino acid that is mutated to another amino acid. Draw the structure of the two amino acids. Describe why this position in your protein is important and outline the effects of the mutation will have on the 3-D structure and the function of your protein.
Answers
The mutated amino acid at position 229 is arginine (Arg), and its substitution can potentially disrupt the 3D structure and alter the function of the protein due to changes in side chain properties and interactions.
Structure of the Amino Acids:
The wild-type amino acid at position 229 is not specified, so the structure cannot be provided.
The mutated amino acid is arginine (Arg), which has a side chain containing a positively charged guanidinium group.
Importance of the Position:
The specific position 229 in the protein sequence may be functionally significant, such as being involved in protein-protein interactions, binding sites, catalytic activity, or structural stability.
Without detailed knowledge of the protein, its function, and its structural context, it is difficult to determine the exact importance of this specific position.
Effects of the Mutation on Structure and Function:
The substitution of an amino acid at position 229 from the original to arginine can have various effects on protein structure and function.
Arginine's larger and positively charged side chain may introduce steric clashes or alter electrostatic interactions within the protein structure.
The mutation can potentially disrupt local or global protein folding, stability, or conformational changes, affecting its overall 3D structure.
The functional consequences of the mutation depend on the specific role of the amino acid at position 229, which can include changes in protein-protein interactions, enzymatic activity, substrate binding, or signal transduction pathways.
It is crucial to analyze the protein's structural context, available experimental data, and computational modeling techniques to gain a more accurate understanding of the specific effects of the mutation on the protein's structure and function in the given context.
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What is the molarity of a solution that contains 265 moles of sucrose (G12H22012) in
82.0 L of solution?
Answers
The molarity of a solution that contains 265 moles of sucrose (C₁₂H₂₂0₁₂) in 82.0 L of solution is 3.23 M.
The number of moles of solute dissolved in one liter of solution is known as the molarity (M) of a solution.
To find the molarity of a solution, it is required to divide the number of moles of solute with the volume of the solution in liters. In this case, divide 265 moles of sucrose in 82.0 L of solution.
Molarity (M) = moles of solute ÷ volume of solution (in liters)
Molarity (M) = 265 moles ÷ 82.0 L
Molarity (M) = 3.23 M
Thus, the molarity of the solution is 3.23 M.
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Calculate the new volume if 12.78 L of a gas at -50*C is heated to a temperature of 28*C
Answers
Explanation:
V1/T1 = V2/T2 T must be in Kelvin
12.78 / (-50 + 273.15) = V2 / ( 28+ 273.15)
V2 = 17.25 L
What do group numbers on the periodic table identify?
Answers
valence electrons
which is an outer shell electron
What element is on period 5 group/family 11
Answers
Answer:
47
Ag
Silver
107.87
Explanation:
hydrocarbons are composed primarily of which two elements?
Answers
Answer: carbon and hydrogen
Explanation:
Hydrocarbons are a group of chemical organic compounds composed of carbon and hydrogen
When energy expenditure proceeds at a slower, more steady pace, the metabolic breakdown of glucose-to-pyruvate-to-acetyl-coa is termed:______.
Answers
When energy expenditure proceeds at a slower, more steady pace, the metabolic breakdown of glucose-to-pyruvate-to-acetyl-CoA is termed Aerobic oxidation.
What type of metabolism does the oxidative system use?Because the oxidative system is aerobic, oxygen is required for it to work. Adenosine triphosphate, or ATP, is a compound that is produced by all three of these mechanisms. Your energy currency is this. ATP is your source of energy, whether you are sleeping, box jumping, or running a marathon. The method of production is the only distinction.
Oxidative systemThe aerobic or oxidative system, as it is often known (as it needs oxygen to produce energy), is a very complex yet crucial system for maximizing health and performance.
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Measuring Liquid Volume Pre-Lab worksheet
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1. The longer distance for each choice is:
1 mile1 meter1 inch2. The complete statements are as follows;
1 mi = 1.6 km1 yd = 0.9444 m1 in = 2.54 cm3. The basic unit of length in the metric system is the meter and is represented by a lowercase m.
4. The meter is defined as the distance traveled by light in absolute vacuum in 1⁄299,792,458 of a second.
5. The values that complete each statement is given below:
1 km = 1000 m1 m = 100 cm1 m = 1000 mm6. The larger value for each option is:
A. 105 centimetersB. 4400 metersC. 12 centimetersD. 1200 millimeters7. The number of millimeters in 1 centimeter is 10 mm
8. Using the ruler and line, the answers are:
2.8 cm29 mm3 cmWhat is the unit for measuring distance in the metric system?The unit for measuring distance in the metric system is the meter. Smaller and larger values of the meter are also used such as millimeters, centimeters, kilometers, etc.
Other units for measuring distance include yards, miles, and inches.
The various units for measuring distance can also be interconverted using their conversion factors.
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Why does the atomic radius decrease as you move across a period (from left to right)?
Select one:
a.The number of electrons increase, which causes the atomic size to decrease
b.The number of protons increase and pull the electrons in closer to the nucleus
c.The atomic radius does not decrease going from left to right, the radius increases.
d.The number of neutrons increase and pull the electrons in closer to the nucleus
Answers
The atomic radius decreases as you move across a period (from left to right) because the number of protons increases and pulls the electrons in closer to the nucleus.
Atomic radius is the distance from the nucleus of an atom to the outermost electrons. The atomic radius decreases as you move from left to right in a period. This decrease is due to the increase in the nuclear charge and the shielding effect. Electrons are attracted to the positive charge of the nucleus but are also repelled by the other electrons in the atom. The shielding effect occurs when the inner electrons shield the outer electrons from the nuclear charge.This results in a smaller atomic radius.
As the number of protons increases, the nucleus becomes more positively charged, which attracts the electrons more strongly. The electrons are pulled in closer to the nucleus, making the atomic radius smaller. Therefore, option b, The number of protons increases and pulls the electrons in closer to the nucleus is correct.
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Write a chemical equation for the acid/base reaction that produces the salt potassium sulfate?
Answers
Answer:
KOH + H2SO4 --> K2SO4 + H2O
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According to Hund's rule, what is the expected magnetic behavior of manganese (Mn)?
Question 10 options:
Paramagnetic
Diamagnetic
Nonmagnetic
Ferromagnetic
Answers
Answer:
Mn is a Paramagnetic
Explanation:
What is the mass of an object if the net force on the object is 15 N and it is accelerating at 3.0 m/s 2 ? (STOP REPORTING MY STUFF THIS TIME IT'S A QUESTION)
Answers
Answer:
the answer is 7.67
Explanation:
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I need help!!!! please
Answers
6.94 is much more closet to 7.016, so Li 7 is more abundant
The statement "atoms have a small, dense nucleus" is true. What evidence do scientists use to prove this statement as true?
Most alpha particles shot at gold foil go straight through, without any changes in their direction.
The particles ejected in Thomson's experiment bent away from the negatively charged plates, but toward positively charged plates.
A few alpha particles shot at gold foil bounce in the opposite direction
No matter which element Thomson put in a cathode ray tube, the same negative particles with the same properties (such as charge and mass) were ejected.
Answers
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the correct option is option C.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.
The statement "atoms have a small, dense nucleus" is true. A few alpha particles shot at gold foil bounce in the opposite direction is the evidence.
Therefore, the correct option is option C.
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