Pls help this is for my semester exam
This graph shows the melting and boiling points of the alkali metals. Think about Francium, do you think it would have a higher or lower melting/boiling
point than lithium? Why? Can you predict it from the data?
The melting point of francium was thought to be around 8.0 °C (46.4 °F); Additionally, 27 °C (81 °F) is frequently encountered. Due to its radioactivity and extreme rarity, the element's melting point is unknown. 20 1.5 °C (68.0 2.7 °F) was the result of a different extrapolation based on Dmitri Mendeleev's method.
Why is francium so soft to the touch?There are additional electron shells as you move down any group—for instance, Lithium has two shells and Francium has seven—that result in electron shielding. The force of attraction diminishes as it travels further through these shells to the outermost one, resulting in less powerful bonding.
Why do alkali metals have lower melting and boiling points?The weaker each metallic bond becomes, the lower the melting and boiling points become. The iotas in a metal are kept intact by the fascination of the cores to electrons which are delocalized over the entire metal mass.
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What is the %CO2 in ZnCO3?
Answer:
ZnCO3 solid reacts to form Zn0 solid plus CO2 gas
I need help explain why the groundwater heater system will heat up the school more then the water heater, please try to make the explaining as long as possible.
Given the fact that it consumes more water than the other system, the groundwater heater will warm the building more efficiently than the hot water system.
Explain what groundwater is.Water that is found underground in saturated regions under the surface of the earth is known as groundwater. The water table is the term for the saturated zone's top surface. Contrary to common perception, subterranean rivers are not created by groundwater.
How is ground water created?Fresh water that soaks into in the soil from precipitation or melting snow and ice is called groundwater. It is kept in the microscopic crevices (pores) underlying rocks and dirt. Nearly 95% of the government's fresh water supplies come from groundwater.
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Which statements correctly describe and provide evidence for the double replacement reaction?
The statements which correctly describe and provide evidence for the double replacement reaction are:
reactants rearrange to form new productsmetal replaces a nonmetalthe cations trade placesThe correct options are A, D, and E.
What are double replacement reactions?Double replacement reactions are reactions where there is an exchange of radicals between two compounds when their solution is mixed together.
In double replacement reactions, a precipitate is always formed.
Also, the metallic ions trade places such that the cation of one compound is exchanged with the cation of the other compound.
A typical double replacement reaction is illustrated below:
AB + CD ---> AD + CB
where;
A and C are cations
B and D are anions.
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Complete question:
Which statements correctly describe and provide evidence for the double replacement reaction?
reactants rearrange to form new productsthere is a single element formeda metal replaces a nonmetala precipitate is formedthe cations trade places
Successive Ionization
Energies (kJ/mol)
1st: 786.3
2nd: 1,580
3rd: 3,230
4th: 4,360
5th: 16,000
6th: 20,000
If this element is found in Period 3, what is its likely identity?
a. sodium
b. magnesium
c. aluminum
d. silicon
e. phosphorus
f. sulfur
g. chlorine
h. argon
Based on the information provided, the element with successive ionization energies of 786.3 kJ/mol, 1,580 kJ/mol, 3,230 kJ/mol, 4,360 kJ/mol, 16,000 kJ/mol, and 20,000 kJ/mol is likely to be aluminum (c).
Ionization energy is the energy required to remove an electron from an atom or a positive ion. It is a measure of the atom's tendency to lose electrons and is generally higher for atoms with a smaller atomic radius and a higher positive charge on the nucleus.
The ionization energies of the elements in Period 3 (the third row of the periodic table) are generally as follows:
Sodium (a): 496.1 kJ/mol (1st), 4,562 kJ/mol (2nd)
Magnesium (b): 738.1 kJ/mol (1st), 1,450 kJ/mol (2nd), 7,646 kJ/mol (3rd)
Aluminum (c): 578.8 kJ/mol (1st), 1,180 kJ/mol (2nd), 2,980 kJ/mol (3rd), 4,180 kJ/mol (4th)
Silicon (d): 786.5 kJ/mol (1st), 1,551 kJ/mol (2nd), 3,217 kJ/mol (3rd), 4,336 kJ/mol (4th), 9,900 kJ/mol (5th)
Phosphorus (e): 1,045 kJ/mol (1st), 2,079 kJ/mol (2nd), 3,169 kJ/mol (3rd), 6,491 kJ/mol (4th)
Sulfur (f): 1,112 kJ/mol (1st), 2,077 kJ/mol (2nd), 3,281 kJ/mol (3rd), 4,535 kJ/mol (4th)
Chlorine (g): 1,257 kJ/mol (1st), 2,362 kJ/mol (2nd), 3,595 kJ/mol (3rd), 4,906 kJ/mol (4th)
Argon (h): 1,521 kJ/mol (1st)
As you can see, the ionization energies of aluminum (c) are the closest match to the values given in the question. Therefore, the element is likely to be aluminum.
find the volume of the solid generated by revolving the region bounded by the graphs of the equations about the given lines. x
V = Adx, or alternatively Ady, where A denotes the usual disc's area and r = f(x) or f(y), depending on the axis of revolution. 2. The volume of the solid produced by a region under f(y) (to the left of f(y)) limited by the y-axis, the horizontal lines y=c and y=d, and rotating around the y-axis.
How do you calculate the volume of a solid produced by rotating about the x-axis?= πr2h 3.
What is the solid's volume as a result of rotating the area bordered by and around the y-axis?V = dc[f(y)]2dy can be used to determine the volume of a solid that has been rotated about the y-axis.
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Potassium dichromate is used to titrate a sample containing an iron. To perform that, the sample is dissolved in an acidic solution, the solution is then titrated with 25 mL of 0.021 M K₂Cr₂07(294 g/mol), resulting in the formation of Fe3+ and Cr³+ ions in an acidic solution. What is the mass of Fe(II) (55.8 g/mol) in the sample? (equation: 6Fe²+ + Cr₂O7²- + 14H* →6Fe³+ + 2Cr³+ + 7H₂0)
The mass of the iron that is present in the sample is 1.76 g.
What is the mass of the iron?We know that we can be able to use the stoichiometry of the reaction so as to be able to obtain the mass of the iron that is used in the reaction. Now we have the the fact that;
Number of moles of the dichromate = 25/1000 * 0.021
= 0.00525 moles
If 6 moles of iron reacts 1 mole of the dichromate
x moles of iron reacts with 0.00525 moles of the dichromate
x = 6 moles * 0.00525 moles /1 mole
= 0.0315 moles
Mass of the iron = 0.0315 moles * 56 g/mol
= 1.76 g
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Suppose that 3.65 g of HCl are dissolved in 10.0 L of water.
What is the value of [H+]?
Show that [OH-] is 1.00 x 10-12 M.
Explanation:
The value of [H+] can be calculated using the concentration of the HCl solution and the balanced chemical equation for the dissociation of HCl in water:
HCl (aq) + H2O (l) → H3O+ (aq) + Cl- (aq)
The concentration of HCl is 3.65 g / (36.5 g/mol) = 0.1 M
The concentration of H+ ions in the solution can be calculated using the concentration of HCl and the stoichiometry of the dissociation reaction:
[H+] = 0.1 M x (1 mol H+ / 1 mol HCl) = 0.1 M
To show that [OH-] is 1.00 x 10-12 M, we can use the relationship between [H+] and [OH-] in aqueous solutions, which is given by the ion product constant for water (Kw):
Kw = [H+] [OH-] = 1.00 x 10-14
Substituting the value of [H+] that we calculated above, we can solve for [OH-]:
[OH-] = Kw / [H+] = (1.00 x 10-14) / (0.1 M) = 1.00 x 10-12 M
Therefore, the concentration of OH- ions in the solution is 1.00 x 10-12 M.
Oxygen has two common molecular anions: peroxide (O22) and superoxide (02). Use an MO energy level diagram to determine the following. 18. The bond order for 02. Enter as an integer or decimal
19.The bond order for O2. Enter as an integer or decimal. 20. The bond order for O22. Enter an integer or decimal. 21. Which of these are paramagnetic? O O2
O O2-
O 022-
22. Which has the longest bond length? O O2
O O2-
O O22-
O₂ and O₂⁻ are paramagnetic while O₂²⁻ is diamagnetic. An entity is paramagnetic if it has unpaired electrons in its molecules. The chemical is diamagnetic if every electron is coupled.
A paramagnetic is what?Unpaired electrons with magnetic dipole moments are paramagnetic as a result. According to QED, an electron's magnetic moment results from its spins and orbiting motion, granting it angular velocity in the microscopic sense.
Iron is paramagnetic for what reason?Compounds that are magnetic are drawn towards the poles of magnets because they contain 1 or more lone pair of electrons. Due to the requirement of electronegativity in their orbitals, both the element iron as iron (III) are paramagnetic. The majority of the time, iron (II) also occupies the same position.
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Pure iron is not strong enough to be useful. Explain, using particle
theory, how adding carbon to iron changes its properties.
Pure iron is not so strong to use in construction field. Addition of carbon make iron more strong and less brittle.
What is cast iron ?The useful form of iron made by incorporating carbon and traces of other metals is called cast iron. Pure form of iron is not strong enough to be useful and it is brittle.
Steel does become stronger and more durable when carbon is added to iron, but only to a certain extent. It will then grow stronger but less resilient (ie like cast iron).
Iron is made stronger by carbon by altering its crystal lattice. In terms of effect, this distortion is comparable to work hardening. Sadly, it is a very complicated impact that depends on how the steel is heat treated and precisely how much carbon is applied. Not all metals are subject to this.
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In a covalent bond, two atoms are held together by the attraction between
Answer:
In a covalent bond, two atoms are held together by the attraction between each atom and the shared electronsthe nuclei of the two atomsthe valence electrons of the two atoms. The number of covalent bonds that an atom can form depends on the number of energy levelsprotons and neutronsvalence electrons in the atom.
Explanation:
problem 8.49 briefly explain how each of the following influences the tensile or yield strength of a semicrystalline polymer and why: (a) molecular weight (b) degree of crystallinity (c) deformation by drawing
(a) The greater interconnectivity of a chains causes the tensile strength to rise with molecular weight.(b) As chain bonding develops, tensile strength rises with the degree of crystallinity.(c) Tensile strength rises when a material is deformed by drawing because the chains realign, increasing overall bonding forces.(d) The concomitant increase is crystallinity and consequently greater bonding causes the tensile strength of the an underformed material to increase with annealing.
How does a semicrystalline polymer's tensile modulus depend on the molecular weight?(A) As the molecular weight of a semicrystalline polymer grows, so does its tensile strength.Increased chain entanglements with higher molecular weights account for this phenomenon.
Would you anticipate polychlorotrifluoroethylene to have tensile strength?Since chlorine has a stronger bond with fluorine than fluorine does with oxygen, we would anticipate polychlorotrifluoroethylene to have higher tensile strength.
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Convert 6.75 cm to mm
Answer: 67.5
Explanation:
Brainliest pls
This element forms a red solution when it complexes with thiocyanate, and although it is not aluminum, a chloride of this element catalyzes a Friedel-Crafts alkylation. The oxide of this element is used industrially to produce ammonia in the Haber-Bosch process, and this element exists in a solid solution with carbon in its gamma variety austenite. This element is derived from the ore hematite, and its brass-colored pyrite is commonly known as "fool's gold". For 10 points, name this transition metal with chemical symbol Fe.
Based on the cues Fe is nothing but ferric which is iron.An very crimson solution containing the ion [Fe (SCN) (H 2 O) 5] results when thiocyanate ions, SCN -, are added to a solution containing iron (III) ions, such as sodium, potassium, or ammonium thiocyanate solution. 2+
In the electrophilic aromatic substitution reaction known as "Friedel-Crafts alkylation," an alkyl substituent is attached to an aromatic ring (benzene). Lewis acids, such as AlCl3 and FeCl3, catalyze these reactions and aid in the production of carbocations from alkyl halides.
The solid phase of the Haber-Bosch Process is heterogeneous catalysis. Both hydrogen and nitrogen, the reactants, are gases. They are both poured into a vessel at a high temperature and extreme pressure in the presence of iron oxide.
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The energy required to run the Calvin cycle reactions of photosynthesis comes from which two substances produced during the light-dependent reactions?
O ATP and NADPH
O ADP and PO4
O H+ and PO2
O O2 and CO2
The substances produced during the light-dependent reactions to run the Calvin cycle reactions of photosynthesis are ATP and NADPH.
Thus, the correct answer is A.
What is the Calvin cycle?The Cаlvin cycle is а cycle thаt tаkes plаce in the stromа of the chloroplаst. The primаry enzyme required for the cycle to occur is the RUBISCO or ribulose-1,5-bisphosphаte cаrboxylаse oxygenаse which is found in the stromа. It is the cycle where the ultimаte plаnt food glucose is synthesized.
The sources of energy in the Cаlvin cycle аre Аdenosine triphosphаte (АTP) аnd Nicotinаmide аdenine dinucleotide phosphаte hydrogen (NАDPH) which аre formed during the light reаction in the thylаkoid membrаne.
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The energy distribution profile (Curve C) for the Y2 molecules is shown in the graph below forthe reaction X+yz_XY2 when it is done under certain experimental conditions Line A represents the most probable energy of the Y2 molecules; and Line B represents the activation energy Which of the following changes should be made to the graph to explain the increase in the rata of the reaction if tho only change in experimental conditions Is tho addltion of a catalyst? Linc A Llne B 1 Curve C Moladul nr Fnomy haCurve C will broaden and Line B will move to the left; because have an energy greater than the minimum more Y2 molecules wlll energy barrier energy needed to overcome the activation ninimeB will move to the left because a larger fraction of minimum energy to overcome the activatiog the Y2 molecules will have the C Curve C and Line A will move to the energy barrier: molecules will Increase; right because the average energy of the Y2 Dilline ^ will move to the right because will increase the most probable energy of the Y2 molecules
Because a greater proportion of the Y2Y2 molecules will have the required energy to break through the activation energy barrier, line B will shift to the left.
What is the name for molecules?Any group of atoms joined together by chemical bonds is referred to as a molecule. A molecule is created from any two atoms together. A compound is an organic molecule composed of atoms from several elements. Not all molecules are compounds, yet all molecules are compounds.
Why isn't salt a molecule?A substance like table salt (NaCl), which is formed of two different types of elements (sodium and chlorine), is a compound, but it is not a molecule since the connection that binds NaCl together is an ionic bond.
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If a precipitate forms, you have a reaction. The precipitate in this lab will be a metal. That precipitate is (more or less) reactive than your original metal?
This question has been bugging me and I just don’t know if the precipitate would be more or less reactive, please help!
More reactive metals will drive less reactive metals from out metal salt complexes. As a result, a new salt as well as the weaker metal are created.
What is a metal, exactly?Any of a group of materials known as metals that exhibit strong thermal and electrical conductivity as well as mutability, ductility, and high light reflection. Copper is an example of metal.
Why is metal so crucial?Metals have various properties, including strength, hardness, and stiffness. From a small paperclip to a huge airplane, metals may be melted and shaped in to something. They effectively conduct heat and electricity.
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How can a chemical equation be balanced? Responses by using exponents to adjust the number of atoms of each element so that the products have the same number of atoms of the same element as in the reactants by using exponents to adjust the number of atoms of each element so that the products have the same number of atoms of the same element as in the reactants by using new elements to adjust the number of atoms of each element so that the products have the same number of atoms of the same element as in the reactants by using new elements to adjust the number of atoms of each element so that the products have the same number of atoms of the same element as in the reactants by using subscripts to adjust the number of atoms of each element so that the products have the same number of atoms of the same element as in the reactants by using subscripts to adjust the number of atoms of each element so that the products have the same number of atoms of the same element as in the reactants by using coefficients to adjust the number of atoms of each element so that the products have the same number of atoms of the same element as in the reactants
The balancing of chemical equations is based on the law of conservation of mass.
How could a chemical process be made to balance out? Which integers can be changed, and which cannot?
When an equation is balanced, the coefficients can only be changed (the numbers in front of molecules or atoms).
The coefficients are indicated by the numerals in front of the molecule. Subscripts are the smaller numerals found following atoms. These cannot be changed while balancing chemical equations!
How is a chemical equation brought to equilibrium?
the algebraic balancing technique. Chemical equations can be balanced by assigning algebraic variables as stoichiometric coefficients to each species in the unbalanced chemical equation.
Equations in mathematics are used to calculate the values of each of these variables
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Answer please the question is on the image.
The ratio of the atoms of the iridium and the platinum is; 8.86 : 1. Option B
What is the ratio of the number of atoms?We know that the atom is the smallest particle of the substances that can be able to take part in a chemical reaction. We know that in the platinum and the iridium, we both have atoms in the substances and now we would want to get the number of atoms that is in each of the elements.
Number of moles of iridium = 100g/192 g/mol = 0.52 moles
Number of moles of platinum = 900g/195 g/mol= 4.6 moles
Number of atoms in the iridium atom = 0.52 moles * 6.02 * 10^23 atoms
= 1.2 * 10^23 atoms
Number of atoms of platinum = 4.6 moles * 6.02 * 10^23 atoms
= 2.7 * 10^24 atoms
Since we have about 100g of the iridium and about 900 g of the platinum, then we have the that the ratio of the atoms of the elements is;
2.7 * 10^24 atoms: 1.2 * 10^23 atoms
= 8.86 : 1
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Which of the following steps can be used to identify a single replacement reaction? a Check whether the products are salt and water. b Check whether the reactants are an acid and a base. c Check if the ions of two compounds exchange places. d Check if one element replaces another element in a compound.
When one element in the compound has been swapped out for another, the single replacement reaction can be recognized. Option C is right as a result.
The replacement reaction is the process in which a compound is formed after a highly reactive element has replaced a low reactive element.
The reaction is listed as follows:
AX + Y X + AY
The highly reactive X causes Y to replace Y in the complex, creating the compound AX.
One element in a compound is replaced by another in a chemical reaction known as a single-displacement reaction, sometimes referred to as a single replacement reaction or exchange reaction.
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Write the reaction that takes place between Ammonia, NH3, and Acetic Acid, HCH3COO. Then determine the acid, base, conjugate acid and conjugate base.
The solution is a. CH3COOH as the acid and base conjugation in the reaction between ammonia and acetic acid −.
In the given chemical equation, acetic acid acts because the acid even as ammonia acts because the base.
The given chemical equation is an acid-base response. Specifically, it's miles an acid-base response among acetic acid and ammonia. In an acid-base response, it's miles crucial to factor out which chemical species are the acid, base, conjugate acid, and conjugate base. In the problem, it most effective desires to pick out the acid reactant and the conjugate base product.
Basically, the acetic acid donates a Hydrogen ion to ammonia to supply the ammonium ion. With this mechanism, we will classify acetic acid as an acid. The conjugate base of the response is the product this is derived from the acid reactant. In this state of affairs wherein acetic acid is the acid reactant, the conjugate base can be the acetate ion. The conjugate base has nearly a comparable chemical method to the acid. It is simply one much less Hydrogen atom as compared to acid. Therefore, the acid reactant is the acetic acid even as the conjugate base reactant is the acetate.
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Answer:
NH3 + HCH3COO --> CH3COO- + NH4+
NH3: base
HCH3COO: acid
CH3COO: conjugate base
NH4+: conjugate acid
Explanation:
We know acetic acid is an acid so that makes ammonia base. An acid donates a proton/,hydrogen so acetic acid will lose a hydrogen and become the conjugate base. Bases gain a proton and become conjugate acids.
The total number of electrons in p orbitals in a silver atom is
A. 6
B. 10
C. 12
D. 18
E. 19
F. 22
The total number of electrons in p orbitals in a silver atom is 18.
What is the electronic configuration of silver (Ag) atom?The position of silver (Ag) in the fifth row of the periodic table, the 11th column of the periodic table, the 9th column of the transition metal, or the d block, determines the electron configuration for silver (Ag). The atomic number of silver is 47. Consequently, the final electron configuration for silver must be:
[tex]1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{6} 5s^{2} 4d^{9}[/tex]
Now, the total number of electrons in p orbitals are 18.
By changing the [tex]1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{6}[/tex] , either core notation or noble gas notation [Kr] can be used to write this notation. Then the configuration can be written as-
[tex][Kr] 5s^{2} 4d^{9}[/tex]
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Fill in the necessary reagents or products, from A through G, to complete each of the following reactions in the formation of 1-phenyl-2-butanol. A through G are single reagents or products, excluding any acid workup. CH2N2 NaBH4 followed by H30+ DIBAL-H -78 °C OH
The effective reducer sodium borohydride. It is extremely efficient at converting aldehydes and ketones into alcohols, although not having the same potency as 1-phenyl-2-butanol.
Isomerism in geometry present in 1 phenyl 2 butene?
Due to the distinct substitutions made to the two double-bonded carbons in 1-phenyl-2-butene, it can display geometric isomerism.
What does 2-butanol's functional group look like?The group of chemical substances referred to as secondary alcohols includes 2-butanol, also known as 2-butyl alcohol or 2-hydroxybutane. The typical structure of secondary alcohols is HOC(R)(R') (R,R'=alkyl, aryl), and they are substances that contain a secondary alcohol functional group. A tasteless substance, 2-butanol has no smell.
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provide a multi step synthesis to create the intended product for the listed original reactant the number of steps are provided
A synthesis reaction is a type of chemical reaction in which two or more reactants combine to form a new compound or product.
How to do synthesis reactions?In a synthesis reaction, atoms from the reactants are rearranged to form a new chemical structure, with the total number of atoms remaining the same.
Identifying the starting material or reactant, as well as the desired end product or target molecule.
Developing a plan or strategy for the synthesis, including a sequence of reactions and steps that will convert the reactant into the product.Choosing the appropriate reagents and conditions for each step of the synthesis, taking into account factors such as reactivity, solubility, and stability.Carrying out the synthesis, carefully monitoring and controlling the reactions to ensure that they proceed as planned.Isolating and purifying the product, using techniques such as crystallization, distillation, or chromatography to remove any impurities or byproducts.Characterizing the product to confirm its identity and purity, using techniques such as spectroscopy, chromatography, or X-ray crystallography.Evaluating the overall success of the synthesis, including any challenges or difficulties that were encountered and how they were overcome.To learn more about synthesis reactions refer :
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Because pure H2 is a hazardous substance, safer and more cost effective techniques to store it as a solid for shipping purposes have been developed. One such method is the reaction represented above, which occurs at 200 degrees Celsius. Which of the following happens to H atoms in the forward reaction?
In the given reaction, hydrogen undergoes both oxidation and reduction. Hydrogen first oxidises from 0 to +1 oxidation state and then reduced to -1 in LiH.
What is oxidation?Oxidation is the process by which element combines with oxygen or loses electron forming its higher oxidation state. Whereas reduction is the process of combining with hydrogen or gaining electron to form the lower oxidation state of the element.
If an element undergoes both oxidation and reduction in the same reaction, it is called as disproportionation reaction. In the given reaction hydrogen undergoes disproportionation reaction.
In the molecular state H₂ is in 0 oxidation state and when it turns to LiNH₂, it oxidises to + 1 oxidation state and then reduces to -1 in LiH. Hence, option C is correct.
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Your question is incomplete. But your complete question probably was:
Because pure H2 is a hazardous substance, safer and more cost effective techniques to store it as a solid for shipping purposes have been developed. One such method is the reaction represented above, which occurs at 200 degrees Celsius. Which of the following happens to H atoms in the forward reaction?
Li₃N(s) + 2 H₂(g) ←→ LiNH₂(s) + 2 LiH(s)
(A) H atoms are oxidized only.
(B) H atoms are reduced only.
(C) H atoms are both oxidized and reduced.
(D) H atoms are neither oxidized nor reduced.
A certain solid substance that is hard, has a high melting point; and is nonconducting unless melted is most likely to be A)AS B) Cr C) k DJ NaCl E)CO
Explanation:
the most likely answer here is cobalt
Use your Counting Atoms Notes, Ionic and Covalent Bonding Notes, and a Periodic
Table to help you on this assignment. You may use a calculator if you need it.
Identify the coefficients and subscripts in the following formulas.
1) 3MgCl2 coefficient:
Subscript for Mg:
Subscript for Cl:
2) 4K2CO3 coefficient:
Subscript for K:
Subscript for C:
Subscript for O:
3) NaC2H3O2 coefficient:
Subscript for Na:
Subscript for C:
Subscript for H:
Subscript for
The number of mole of atoms of an element in the given compounds is written as subscripts as shown below:
1) 3 MgCl₂
coefficient: 3Subscript for Mg: 1Subscript for Cl: 22) 4 K₂CO₃:
coefficient: 4Subscript for K: 2Subscript for C: 1Subscript for O: 33) NaC₂H₃O₂
coefficient: 1Subscript for Na: 1Subscript for C: 2Subscript for H: 3Subscript for O: 2What are chemical formulas?Chemical formulas are formulas that are used to represent compounds using the symbol of the elements found in the compounds.
The moles of atoms of each element found in the compound are written as subscripts in front of the element.
The moles of the compound present are written as coefficients in front of the chemical formula of the compound.
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The molar masses of four unknown gases are shown in the table.
Molar Mass of
Unknown Gases
Gas Molar Mass
A
44 g/mol
B
20 g/mol
30 g/mol
D
32 g/mol
Which gas is likely to have the highest rate of effusion? (4 points)
Gas A
Gas B
Gas C
Gas
GAS A, Graham's law states that the rate of effusion of a gas is inversely proportional to the square root of its molar mass or that the rate of effusion of two gases = square root of the inverse of their molar masses.
How can the molar mass of an unidentified gas be determined?PV = nRT, where P is pressure (in atm), V is the volume (in L), n is the number of moles of gas, R is the universal gas constant (0.08206 Latm/molK), and T is temperature, is the formula used to calculate the molar mass (in K).
What is the molar mass of a gas whose density is 0.761 g L at STP?By dividing the mass of one mole of ammonia by the aforementioned volume, the density can now be computed. This density is somewhat lower than the ammonia density at the STP, which is equivalent to (170.4g/mol)(22.4L/mol)=0.761g/L.
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For the reaction A+B+C→D+E
, the initial reaction rate was measured for various initial concentrations of reactants. The following data were collected:
What is the value of the rate constant k for this reaction?
Answer:
the answer is a
Explanation:
A
because if u add
select the reasons why early molecular geneticists knew that the genetic material needed to be a stable molecule.
This allowed for exact replication. Genetic material has to be a stable molecule in order to be handed down from one generation to the next.
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