It takes 8,350 joules of heat, or 2,000 calories, to melt 25 grams of ice.
How much heat is required to melt 25.0 g of ice at 0 C?The heat of fusion is the quantity of heat energy needed to convert a substance from a solid to a liquid state of matter. As the enthalpy of fusion, it has another name. Typically, it measures energy in joules per gram (J/g) or calories per gram (Cal/g). Calculating the amount of energy needed to melt a sample of water ice is shown how to do in this example problem.Examples:
To melt 25 grammes of ice, how much heat, in Joules, is needed? The heat in calories is what?
334 J/g = 80 calories per gramme of food containing water.
Solution
Heat of fusion is specified in the problem. Not off the top of your head knowledge, this is not a number. Common values for the heat of fusion are listed in chemistry tables.
You will need the equation relating heat energy to mass and heat of fusion in order to tackle this issue:
When q = heat energy and m = mass, q = mHf.
The heat of fusion is Hf.
Since it is unaffected by a change in matter's condition, temperature is not a factor in the equation. Making sure you are using the appropriate units for the answer is crucial because the equation is quite simple.
Converting heat into Joules:
q = (25 g)x(334 J/g)
q = 8350 J
In terms of calories, it's equally simple to describe the heat:
q = m·ΔHf
q = (25g)x(80cal/g)
q = 2000 cal
Answer: It takes 8,350 joules of heat, or 2,000 calories, to melt 25 grammes of ice.
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Which of the following is most likely to produce a spontaneous reaction?
A. Negative enthalpy
B. Positive enthalpy
C. Negative Entropy
D. Positive Entropy
E. Negative Enthalpy and positive Entropy
E. Negative Enthalpy and positive Entropy, A spontaneous reaction is most likely to occur when negative enthalpy and positive entropy are present.
A spontaneous reaction is one that favours the creation of products under the reaction's current circumstances. A blaze that is raging and exothermic is an illustration of a spontaneous reaction (there is a decrease in the energy of the system as energy is released to the surroundings as heat). An uninterrupted spontaneous reaction takes place under a certain set of circumstances. With the aid of outside factors like heat or energy, the non-spontaneous reaction occurs. Chemical or biological events that happen on their own, unaffected by extraneous forces or influences, are referred to as spontaneous reactions.
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medication order reads: rocephin 0.7 g im q 12 h. supply on hand: rocephin 1 g, reconstitute the 1 g vial by adding 2.1 ml of sterile water for injection. yields 350 mg/ml. give ml
A doctor issues a prescription for a drug to be taken and writes a prescription order.
What are the 4 different orders for prescription drugs?Medication orders can be divided into four categories: standing orders, single orders, standing orders, and prn orders.
A doctor issues a prescription for a drug to be taken and writes a prescription order. A nurse cannot deliver drugs without a prescription. Before a prescription may be filled, some details must be included in the prescription order.
Generally speaking, a medicine "order" is viewed of as an inpatient medication request, whereas a prescription is thought of as an outpatient medication request. A nurse may typically give a patient an order, while a prescription is something they can complete at the pharmacy.
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In chronic respiratory acidosis, the kidneys compensate by doing which of the following? You may select more than one answer. Choose all that apply. A) Excretion of bicarbonate B) Increased production of ammonia C) Secretion of H+ into renal tubular fluid
In chronic respiratory acidosis, the kidneys compensate by doing excretion of bicarbonate and increased production of ammonia.
What is bicarbonate?
Bicarbonate is a salt compound composed of sodium and bicarbonate ions. It is also known as baking soda or sodium bicarbonate and is widely used in a variety of applications. In the kitchen, it is used as a leavening agent in baking, and it is also used as a gentle cleaning agent for surfaces and cookware. Bicarbonate is also used in the production of soaps, detergents, and various other products. In the medical field, bicarbonate is used as an antacid to treat acid reflux and other digestive problems. It is also an important electrolyte and acid-base buffer in the body, helping to regulate the pH of the blood.
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Ammonia is produced from the reaction of nitrogen and hydrogen according to the following balanced equation: N2(g) + 3H2(g) rightarrow 2NH3(g) What is the maximum mass of ammonia that can be produced from a mixture of 330.0 g of N2 and 420.0 g of H2? g Which element would be left partially unreacted? (enter nitrogen or hydrogen) What mass of the starting material would remain unreacted? g Look at how many grams of ammonia the N2 would produce and how many grams of ammonia the H2 would produce. Watch the mole ratios! Whichever produces the smallest amount of ammonia is the limiting reactant. HINT: After you have found which starting material was used up completely, you know that some of the other starting material is still unreacted. Subtract the reacted material (which you must calculate) from the original amount you had in the beginning, thus finding how much remains unreacted.
The maximum mass of ammonia that can be produced from a mixture of 330.0 g of N2 and 420.0 g of H2 is 400.7g. Hydrogen is left unreacted. The mass of the Hydrogen would remain unreacted is 349.3g.
What is the limiting reagent?A chemical reaction's limiting reagent is the one that will totally consume all of the reactants. The reaction cannot continue if that reactant is no longer present. It prevents the reaction from intensifying as a result.
The reactant with surplus reagent is the one that would have continued to react if the other had not been used up.
The limiting reactant is the one that is consumed first and establishes a maximum limit on the quantity of product(s) that can be produced.
Calculate the amount of each reactant present and compare it to the amount of each reactant in the balanced chemical equation to determine the limiting reactant.
1) Moles of N2=330/28=11.79
moles of H2=420/2=210
moles of NH3 formed=2*11.79=23.57moles = 400.7g
2) Hydrogen is left unreacted.
3) hydrogen left=210-11.79*3=174.64moles = 349.3g
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g compound a, c8h10, absorbed 3 equivalents of h2 on catalytic hydrogenation over a pd/c catalyst to give b (c8h16). on ozonolysis, compound a gave, among other things, a ketone which was identified as cyclopentanone. on treatment with nanh2 in nh3, followed by addition of iodomethane, compound a gave a new hydrocarbon, c (c9h12).
On catalytic hydrogenation, molecule A C8H10 absorbed three equivalents of H2, which indicates that it either possesses one double bond and one triple bonds or three double bonds.
Over a Pd/C catalyst, compound A, C8H10, underwent catalytic hydrogenation and absorbed three equivalents of H2 to generate compound B. (C8H16). Ozonolysis of compound A resulted in the production of many compounds, including the ketone cyclopentanone. Compound A was treated with NaNH2 in NH3, and then iodomethane was added, resulting in the production of a new hydrocarbon, C. (C9H12).
The given chemical A C8H10 has an unsaturation level of
[tex]DU= (Cn+1)-Hn/2 -Xn/2 +Nn/2[/tex]
[tex]DU = (8+1)-10/2[/tex]
[tex]DU = 4[/tex]
The given chemical thus either has four double bonds, four rings, or three double bonds and a ring.
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complete question: Compound A, C8H10, absorbed 3 equivalents of H2 on catalytic hydrogenation over a Pd/C catalyst to give B (C8H16). On ozonolysis, compound A gave, among other things, a ketone which was identified as cyclopentanone. On treatment with NaNH2 in NH3, followed by addition of iodomethane, compound A gave a new hydrocarbon, C (C9H12). Draw the structure of Compound A and Compound B.
When limestone is heated during Step 1, an equilibrium is established. Which of the following expressions is the equilibrium constant for the decomposition of limestone?
A.
[CaO]
B.
[CaCO3]
C.
[CO2]
D.
[CaO] × [CaCO3]
The decomposition of limestone is the reaction of calcium carbonate (CaCO3) with heat to form calcium oxide (CaO) and carbon dioxide (CO2).
The equilibrium constant for a reaction is typically represented by a specific symbol, such as Kc or Kp, and is a measure of the relative concentrations of the reactants and products at equilibrium.The equilibrium constant for the decomposition of limestone is represented by Kc and is the product of the concentrations of the products raised to their stoichiometric coefficients, divided by the product of the concentrations of the reactants raised to their stoichiometric coefficients. Kc = [CaO] * [CO2] / [CaCO3]. Therefore the correct answer is D. [CaO] × [CaCO3]
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two tablets of the antibiotic isoniazid were crushed, dissolved, and homogenized in 100 ml of water. the solution was then assayed using redox titration. given the equation below, if 12.16 ml of 0.020 m kbro3 was required to reach the endpoint, how many mg of isoniazid were present in each isoniazid tablet? (note: mw of isoniazid
Dosage for an isoniazid and rifapentine combo regimen administered in 12 once-weekly doses while being closely monitored for the treatment of latent Mycobacterium tuberculosis infection. There are 100 mg and 300 mg tablets available of isoniazid (INH).
How much Isoniazid is the MG?Depending on the schedule that your doctor determines for you, the typical dose is 10 to 20 mg per kg (4.5 to 9.1 mg per pound) of body weight, up to 300 mg, once a day; or 20 to 40 mg per kg (9.1 to 18.2 mg per pound) of body weight, up to 900 mg, twice a week; or three times a week.Dosage for an isoniazid and rifapentine combo regimen administered in 12 once-weekly doses while being closely monitored for the treatment of latent Mycobacterium tuberculosis infection. There are 100 mg and 300 mg tablets available of isoniazid (INH).To learn more about isoniazid refer to:
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At a certain temperature the vapor pressure of pure chloroform (CHCI3) is measured to be 264. torr. Suppose a solution is prepared by mixing 82.9 g of chloroform and 62.9 g of heptane (C7H16). Calculate the partial pressure of chloroform vapor above this solution. Round your answer to 3 significant digits.
To determine the partial pressure of chloroform vapor, we can use Raoult's law. According to Raoult's law, a component's partial pressure in a solution is equal to its vapor pressure.
What does Raoult's law entail?
According to Raoult's law, a component's partial vapor pressure in a solution is equal to the vapor pressure of the pure component times the mole fraction present in the solution. Ideal solutions, which are those made up of volatile, unrelated molecules, are those that fall under the purview of this law. The total of the partial vapor pressures of the solution's constituent parts determines its vapor pressure. The ideal solution theory, which is based on Raoult's law, states that the vaporTo learn more about Raoult's law
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Which of the following compounds are the same?
Compound 1: 1.10 g of H and 8.90 g of O.
Compound 2: 4.95 g of H and 40.05 g of O.
Compound 3: 2.10 g of H and 32.90 g of O.
Compound 4: 4.70 g of H and 60.30 g of O
A. Compounds 1 and 4
B. Compounds 2 and 4
C. Compounds 2 and 3
D. Compounds 1 and 2
The following includes compounds 2 and 4 that are identical. In chemistry, a compound is a substance that is produced when two or more distinct chemical elements are combined in a particular order.
what are the different types of compounds?Salts and molecular compounds are the two main categories of chemicals. Covalent bonds are the means through which atoms in molecular compounds are joined. It is connected by ionic bonds in salts. All compounds are composed of these two different sorts of bonds.
Compounds are what kind of things?(KOM-pownd) A substance in science that is created through the chemical joining of two or more distinct elements Table salt (NaCl), which is a compound comprised of the elements sodium and chloride, and water (H2O), which are examples of compounds.
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A metal sample weighs 6.49 x 10-2 lb, is 0.925 in long, 0.0134 m wide, and 3.44 x 10-2 ft thick. The density of the metal is _______ g/cm3.
Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore, the density of the metal is 6.905g/cm³.
What is density?Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.
Mathematically,
Density = Mass of the metal ball ÷volume marked on the graduated cylinder
mass =2943.8g
volume= length ×breadth ×height
=0.925×0.0134 ×0.0344
=0.00042m³
=426.3cm³
density= mass/ volume
=2943.8g/426.3cm³
=6.905g/cm³
Therefore, the density of the metal is 6.905g/cm³.
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Assuming all other conditions remain the same, which of the following will cause an object's density to increase?A) Its mass increasesB) its volume increasesC) its atoms move togetherD) all of the above
Density of an object will increase if its mass is increases or if its atoms move together.
What is density?
Density is defined as the mass of an object per unit volume and is calculated by dividing the mass of the object by its volume.
So, if the mass of the object increases while the volume remains constant, the density will increase. This is because the mass per unit volume will be greater.
On the other hand, if the volume of the object increases while the mass remains constant, the density will decrease. This is because the mass per unit volume will be smaller.
Finally, if the atoms of the object move closer together, the volume of the object will decrease and therefore the density will increase.
Therefore, option A) Its mass increases and C) its atoms move together will cause an object's density to increase. Option B) its volume increases will cause density to decrease.
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Factors that affect the rate of a chemical reaction include which of the following? I. Frequency of collisions of reactant particles II. Kinetic energy of collisions of reactant particles III. Orientation of reactant particles during collisions a. I and Il only 0 b. I, Il, and Ill c. Il and IIl only d. Il only e. I and Ill only
Some elements that impact a chemical reaction's pace are collisions between reactant particles have kinetic energy.
What are the factors affecting the chemical reaction?Two or more molecules colliding with the proper energy and orientation to create a new chemical compound is known as a chemical reaction. It should be possible to maintain the reaction's whole mass. Chemical reactions come in a wide variety of forms, such as double displacement reactions and combination reactions.
There are a multitude of variables that might influence a reaction's rate, and one of these is the kinetic energy of reactant particle collisions. Chemical reaction rates are inversely correlated with reaction rates. Five variables have been identified as having an impact on chemical reaction rates: the reactants' state of subdivision (one big lump versus many little particles), the chemical composition of the reacting substances,
Therefore the correct answer is option d ) Il only
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Select the equation that has the following mole ratio:
2:6:2:3
a
Li3PO4 + 3KCl → 3LiCl + K3PO4
b
NaOH + HCl → NaCl + H2O
c
Na2O + CaCl2 → 2NaCl + CaO
d
2Al + 6HCl → 2AlCl3 + 3H2
The chemical equation which has the given mole ratio is 2 Al + 6 HCl → 2 AlCl₃ + 3 H₂.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
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(2) The student adds some dilute nitric acid to a burette and does the titration. The equation for the reaction is Ba(OH)₂ + 2HNO, → Ba(NO₂)₂ + 2H₂O The student finds that 21.50 cm' of nitric acid of concentration 0.600 mol/dm³ neutralises 25.0 cm³ of barium hydroxide solution. Calculate the concentration, in mol/dm³, of the barium hydroxide solution.
Answer:
0.0964, I worked out the moles of barium hydroxide and divided this by two and then divided that by the volume of nitric acid
Explanation:
Answer:
0.258 mol/dm3
Explanation:
Ba(OH)2 + 2HNO3 ---------> Ba(NO2)2 +2H2O
1 : 2 : 1 : 2
0.00645 : 0.0129 : 0.00645 : 0.0129
Moles of Nitric Acid
Moles=Concentration X Volume(dm3)
0.600 X 0.0215
=0.0129 mol
Concentration= Moles/ Volume(dm3)
0.00645/0.025
= 0.258 mol/dm3
in question 19, we said intermolecular forces would cause pressure to be than predicted. is this observed in model 3?
Molecules should collide at a smaller volume, the pressure actually applied will be higher than that which was expected.
The phrase "intermolecular forces," or "IMF," refers to the attractive and repulsive forces that form between the molecules of a substance. Through the use of these forces, certain molecules of a substance communicate with one another. Most of the physical and chemical features of matter are caused by intermolecular forces. Pressure is created when gas molecules slam into the container's walls. The elastic bombardment of moving molecules on the walls is what causes this pressure, according to the kinetic theory of gases. Because molecules should collide at a smaller volume, the pressure actually applied will be higher than that which was expected.
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balance the chemical reaction between citric acid and sodium hydrogen carbonate below after you complete the reaction?
H₃C₆H₅O₇ + 3NaHCO₃ → Na₃C₆H₅O₇ + 3H₂O + 3CO₂ is a balanced equation. In addition to carbon dioxide, the interaction.
The chemical reaction of citric acid and sodium bicarbonate creates sodium citrate and water. The following is the reaction:
H₃C₆H₅O₇ + 3NaHCO₃ → Na₃C₆H₅O₇ + 3H₂O + 3CO₂.
To draw its Lewis structure, we see that a hydrogen is bonded to a Sulphur, suggesting that there would be no hydrogen bonding, but the shape is curved, showing that Sulphur and hydrogen have different electronegativity. As a result, this is a polar molecule with dipole-dipole as the most powerful force. The following molecule is non-polar and consists of only two atoms. Chemical reaction between citric acid and sodium hydrogen carbonate below after you complete the reaction.
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The complete question is:
Balance the chemical reaction between citric acid and sodium hydrogen carbonate below after you complete the reaction?
H₃C₆H₅O₇ + NaHCO₃ → Na₃C₆H₅O₇ + H₂O + CO₂
ATP is produced in some of the steps of the glycolytic pathway. For the reactions shown, which produce ATP?
a. Phosphoenolpyruvate → pyruvate
b. 1,3-biphosphoglycerate → 3-phosphoglycerate
c. glyceraldehyde 3-phosphate → 1,3-bisphosphoglycerate
d. Phosphoenolpyruvate → glyceraldehyde 3-phosphate
The glycolytic process includes some phases where ATP is created. ATP is created from phosphoenolpyruvate.
b. 1,3-biphosphoglycerate → 3-phosphoglycerate - Produces 1 ATP
d. Phosphoenolpyruvate → glyceraldehyde 3-phosphate - Produces 1 ATP
During which steps of glycolysis is ATP produced?
The final product of glycolysis is pyruvate, which is then converted into energy and two ATPs (Glucose + two NAD+, two ADP, and two pi = two pyruvate, two NADH, two H+, two ATP, and two molecules of water). In order to phosphorylate, the hydroxyl groups are necessary.
Glycolysis uses glucose 6-phosphate as a particular type of glucose.
The glycolytic process includes some phases where ATP is created. ATP is created from phosphoenolpyruvate.
At the end of glycolysis, one glucose molecule produces four ATP molecules. There is a net gain of 2 ATP molecules as 2 ATP molecules are lost during the first stage of glycolysis. The creation of two NADH molecules occurs as a side effect of glycolysis.
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The pH of an aqueous solution is defined as the negative of the logarithm of the concentration of H ion in the solution:
pH-log[H Compute the pH of the solution if the concentration of H ion is 0.02 moles per liter Select one: A. 1.05 B. 2.7 C. 0.95 D. 1.7 E. 0.7
The pH of an aqueous solution is defined as the negative of the logarithm of the concentration of H ion in the solution is 0.7 .
What is meant by logarithm ?
The logarithm is exponentiation's opposite function in mathematics.This indicates that the exponent to which b must be raised in order to obtain a number x is the logarithm of x to the base b.John Napier developed logarithms in 1614 as a way to make calculations easier.They were quickly adopted by surveyors, engineers, scientists, and navigators to make high-accuracy calculations simpler.Logarithm tables allow for the simple addition and table lookup of arduous multi-digit multiplication processes.The exponential function and the letter e were both introduced by Leonhard Euler in the 18th century, who also gave us the idea of logarithms as we know them today.To learn more about logarithm refer to
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does the frequency of the electromagnetic radiation released when excited electrons return to ground state rely on which orbits ?
Frequency of the electromagnetic radiation wavelength excited electrons return to ground state rely on which orbits.
What is meant by electromagnetic ?
The electromagnetic force that exists between electrically charged particles is the subject of the branch of physics known as electromagnetism.One of the four fundamental forces, the electromagnetic force, manifests electromagnetic fields like magnetic fields, electric fields, and light.Radio and television waves, microwaves, infrared rays, visible light, ultraviolet light, X-rays, and gamma rays are all examples of electromagnetic waves that propagate across space independently of matter.They are all referred to as electromagnetic radiation by scientists. Since the electric and magnetic fields are oscillating, the waves of energy are known as electromagnetic (EM). They are categorized by scientists based on their frequency or wavelength, from high frequency to low frequency.To learn more about electromagnetic refer to
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the atomic mass unit is a standardized unit defined as exactly 112 the mass of a(n) -12 atom. the atomic mass (weight) of any element is determined relative to this standard and is not a whole number, since it is a(n) of the masses of its naturally occurring isotopes.
The atomic mass of an element is the total number of protons and the neutrons in a particular atom of the element.
The atomic mass unit is a standardized unit and defined as the exactly 1 / 12 the mass of a carbon -12 atom. The atomic mass or weight of any element is determined by the relative to this standard and is not a whole number, since it is an average of the masses of its naturally occurring isotopes.
The atomic mass of an element is total number of protons and the neutrons. The atomic mass is average weight of all the isotopes of that element.
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A prescription medication requires 8.00 mg per kg of body weight . Express your answer to three significant figures.
A prescription medication requires 8.00 mg per kg of body weight . The 0.017 grams is required per pound of the body weight. 1.7 × 10⁻² grams is required per pound of the body weight.
What is significant figure ?The term significant figure is defined as the number of digits in a value, often a measurement, that contribute to the degree of accuracy of the value.
We are given:
Medication requirement = 5.98 mg/kg
To convert the given amount in grams per pounds, we use the conversion factor:
1 kg = 2.20462 lb
1 g = 1000 mg
Converting the value into grams per pounds, we get:
= 8 mg / kg × 1g / 1000mg × 2.20462 lb / 1kg
= 0.017 grams
Thus, 1.7 × 10⁻² grams is required per pound of the body weight.
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Select, from the following dienophiles, all that would be more reactive than ethylene in a Diels-Alder reaction.
A, C, and D are dienophiles that would be more reactive than ethylene in a Diels-Alder process. Electron-drawing groups on the dienophile in general.
hasten Diels-Alder reactions (diene lover). Ethylene reacts slowly in a Diels-Alder reaction, whereas propenal, ethyl propenoate, and the other chemicals listed below are quite reactive. In the Diels-Alder reaction, a diene reacts with a pi bond (often referred to as a "dienophile") to generate a new six-membered ring. Two C-C sigma bonds and a C-C (pi) bond are formed, whereas three C-C pi bonds are broken. All of the following dienophiles are more reactive than ethylene in a Diels-Alder synthesis. A, C, and D are dienophiles that are more reactive than ethylene in a Diels-Alder reaction.
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ions of which metal would be excpected to have the strongest interactions with water molecules in aqueous solutions
In aqueous solutions, ions of metals that are highly reactive and have a high charge density (such as those in the Group 1 or Group 2 of the periodic table) would be expected to have the strongest interactions with water molecules.
These metals have a high tendency to lose electrons and form cations, which can interact with the polar water molecules through electrostatic forces, such as hydrogen bonding.For example, ions of sodium (Na+), potassium (K+), calcium (Ca2+), and magnesium (Mg2+) are highly reactive and have high charge densities, and they would be expected to have strong interactions with water molecules in aqueous solutions. These ions are easily dissolved in water and form hydrated ions, which are surrounded by a "shell" of water molecules.In general, ions with a high charge to radius ratio will form stronger bonds with water molecules, so positively charged ions from the left side of the periodic table tend to be more hydrated.
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select all the reactions in which the oxidation numbers of the reactant species change, that is, are redox reactions.
The redox reactions are: a) 7O₂ (g) + 2C₂H₆ (l) → 4CO₂ (g) + 6H₂O (l) & c) Cu(OH)₂ (s) + 2HClO₄ (aq) → Cu(ClO₄)₂ (aq) + H₂O (l).
a) 7O₂ (g) + 2C₂H₆ (l) → 4CO₂ (g) + 6H₂O (l) is a redox reaction. Oxygen is gaining electrons and becoming reduced (from O₂ to H₂O) while the carbon in the C₂H₆ is losing electrons and becoming oxidized (from C₂H₆ to CO₂).
b) Co (s) + Cl₂ (g) → CoCl₂ (s) is not a redox reaction, as the oxidation numbers of cobalt and chlorine remain the same on both sides of the equation.
c) c) Cu(OH)₂ (s) + 2HClO₄ (aq) → Cu(ClO₄)₂ (aq) + H₂O (l) is a redox reaction. Copper is losing electrons and becoming oxidized (from Cu(OH)₂ to Cu(ClO₄)₂) while the chlorine in the HClO₄ is gaining electrons and becoming reduced (from ClO₄ to Cl).
d) ZnBr₂ (aq) + 2KOH (aq) → Zn(OH)₂ (s) + 2KBr (aq) is a redox reaction. Zinc is losing electrons and becoming oxidized (from ZnBr₂ to Zn(OH)₂) while the Hydrogen in the KOH is gaining electrons and becoming reduced (from KOH to KBr).
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The complete question is:
Select all the reactions in which the oxidation numbers of the reactant species change, that is, are redox reactions.
a) 7O₂ (g) + 2C₂H₆ (l) → 4CO₂ (g) + 6H₂O (l)
b) Co (s) + Cl₂ (g) → CoCl₂ (s)
c) Cu(OH)₂ (s) + 2HClO₄ (aq) → Cu(ClO₄)₂ (aq) + H₂O (l)
d) ZnBr₂ (aq) + 2KOH (aq) → Zn(OH)₂ (s) + 2KBr (aq)
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Correctly order the steps necessary to solve for the mass of a product, or second reactant required, given the mass of one of the reactants in a chemical process. Start with the first step at the top of the list. Place these in the proper order. O Convert the given mass into moles using molar mass. Convert moles of A to moles of B using a conversion factor derived from the balanced equation O Convert the moles of the second substance to mass using its molar mass. O Write a balanced equation for the reaction.
The correct sequence in this case would be-
Each organ system directly contributes to 1. For the reaction, write a balanced equation. Use molar mass to convert the given mass into moles.Use a conversion factor derived from the balanced equation to change moles of A into moles of B. Using the second substance's molar mass, convert the second substance's moles to mass.In terms of size and mass, molecules and atoms are incredibly small. The weight of one sample mole is known as the molar mass. The molar mass is determined by adding the atomic masses (atomic weights) of each atom in the molecule. Use the mass listed in the Periodic Table or Atomic Weight Table to determine the atomic mass for each element.To calculate the molecular mass, multiply the subscript (number of atoms) by the atomic mass of the relevant element and add the masses of all the other elements in the molecule. Typically, molar mass is expressed in either grams (g) or kilograms (kg). The amount of atoms in one mole of the 12C isotope is equal to the amount of particles in 12g (0.012 kg) of the substance. one of the most crucialTo know more about molar mass here
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Give the coordination number and charge of the central metal ion of the complex cation and then, separately, the complex anion in the coordination compound [cr(nh3)6][cr(cn)6].Give a systematic name for the following formula: [cr(nh3)6][cr(cn)6]
The coordination number and charge of the central metal ion of the complex cation [Cr(NH3)6]3+ in the coordination compound [Cr(NH3)6][Cr(CN)6] is 6 and 3+ respectively.
The coordination compound [Cr(NH3)6][Cr(CN)6] is composed of two ions: the complex cation [Cr(NH3)6]3+ and the complex anion [Cr(CN)6]4-. The complex cation [Cr(NH3)6]3+ is formed by the central metal ion, chromium (Cr), and six ammonia (NH3) molecules. The coordination number of the central metal ion in this complex cation is 6, which means it has six ligands (NH3) surrounding it. The charge of the central metal ion in this complex cation is 3+, which means it has lost 3 electrons. The complex anion [Cr(CN)6]4- is formed by the central metal ion, chromium (Cr), and six cyanide (CN) molecules. The coordination number of the central metal ion in this complex anion is 6, which means it has six ligands (CN) surrounding it. The charge of the central metal ion in this complex anion is 4-, which means it has gained 4 electrons. The systematic name for the formula [Cr(NH3)6][Cr(CN)6] is hexaamminochromium(III) hexacyanochromate(IV).
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Suppose you place 3.85 mL of a substance into a graduated cylinder. The graduated cylinder has a mass of 12.55 g when empty and a mass of 14.75 g after adding the substance.
What is the density of the substance (in g/mL)?
Type answer:
The density of the substance placed into the graduating cylinder is 0.571g/mL.
How to calculate density?Density is the measurement of the amount of mass per unit of volume. In order to calculate density, you need to know the mass and volume of the item. The formula for density is:
density = mass/volume
According to this question, 3.85 mL of a substance is placed into a graduated cylinder. The graduated cylinder has a mass of 12.55 g when empty and a mass of 14.75 g after adding the substance.
Mass of substance = 14.75g - 12.55g = 2.2g
Density of the substance = 2.2g ÷ 3.85mL = 0.571g/mL.
Therefore, 0.571g/mL is the density of the substance.
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A 13.0 ml sample of an acid requires 37,3 ml of 0.303N NaOH for neutralization. Calculate the normality of the acid.
The amount of 0.303N NaOH needed to neutralize a 13.0 ml sample of acid is 37,3 ml. Acid is 0.823N normal, according to the standard.
Explain about the neutralization.The idea of neutralization, according to which an acid reacts with a base to create salt and water. By comparing the molarity of the base to the amount of base needed for neutralization, it is possible to calculate the molarity of the acid. Once the molarity and the acid's valence (or charge) have been multiplied, the acid's normalcy can be determined.
By deducting the volume of NaOH (37.3 ml) from the volume of the acid sample in Step 1, you can calculate the amount of acid that was utilized in the neutralization procedure (13.0 ml).
Consequently, 13.0 ml to 37.3 ml
= -24.3 ml
Use the equation moles = normality x volume to determine the number of moles of acid that were used in the process.
Consequently, moles equal 0.303N x -24.3 ml.
= -7.33 moles
Determine the acid's normality by multiplying the volume by the formula normalcy = moles.
As a result: normalcy = -7.33 moles / 13.0 ml
= -0.823N
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What is the oxidation number of the manganese atom (Mn) in this compound?
MnO₂
+2
O +4
O4
The correct answer is B) +4. This is because the oxidation number of the manganese atom (Mn) in MnO₂ is +4.
What is oxidation number?The oxidation number of an atom is a number assigned to an element in a chemical compound that indicates the total number of electrons that an atom has lost or gained. Oxidation numbers are typically written with a plus or minus sign to indicate whether an atom has lost or gained electrons. Oxidation numbers can be used to determine the type of reaction taking place in a chemical reaction and the type of bonds formed. Oxidation numbers are also useful for recognizing the oxidation state of an element in a compound. The oxidation number of an atom in its elemental form is always zero.
This is because the oxidation number of oxygen (O) is always -2, and the oxidation number of the compound must add up to 0. Therefore, the oxidation number of Mn must be +4 in order for the compound to have an overall charge of 0.
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What following actions are permitted in balancing a chemical equation?
-Multiplying all coefficients by a common factor
- Inserting coefficients and front of formulas of reactants and products
The actions that aren't permitted in balancing a chemical equation is given below.
What is chemical equation?A chemical equation is an expression that represents the chemical reaction between two or more substances. It consists of the chemical formulas of the reactants (the starting materials) and the products (the end result of the reaction), along with the physical states of the reactants and products (solid, liquid, gas, etc.) and the symbols that denote the type of reaction that is taking place (e.g. double arrow for a reversible reaction). The number of atoms of each element in the reactants and products must be the same on both sides of the equation.
Multiplying all coefficients by a common factor
- Inserting coefficients and front of formulas of reactants and products to balance the equation
- Adding coefficients in front of formulas of reactants and products to balance the equation
- Ignoring common elements in the equation
- Using the law of conservation of mass to balance the equation
- Combining like terms on both the reactants and products side of the equation
- Splitting a compound into its constituent elements with their respective coefficients
- Cancelling out any coefficients that are equal on both sides of the equation
- Rearranging terms to obtain the desired balance
- Substituting coefficients until the equation is balanced
- Checking the equation after balancing to verify that all atoms are balanced on both sides of the equation.
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