Calculate the moles in each reactant
Acetic Acid (.231 mol/L)(0.125L)= 2.887 x 10^-2 mol AA
NAOH (.209mol/L)(.037L)= 7.733 x 10^-3 mol NaOH
As you can see, we have more AA and less NaOH, so NaOH is the limiting reactant.
NaOH + CH3COOH -> NaCH3COOH + H2O
start: 4.5 mmol, 8.75mmol, 0, n/a
change: -4.5 mmol, -4.5mmol, 4.5mmol, n/a
after rxn: 0, 4.25 mmol, 4.5mmol, n/a
Now your HH equation
pKa + log(conjugate base/acid) = 4.75 + log(4.5x10^-3 / 4.25x10^-3) =
pH = 4.76
What is Henderson-Hasselbalch equation?The Henderson-Hasselbalch equation in chemistry and biology connects the pH of a weak acid solution to its acid dissociation constant, Ka, and the ratio of the concentrations of the acid and its conjugate base in equilibrium.
When both the pH of the solution and the ratio of ionized to unionized forms are known, the Henderson Hasselbalch equation can be used to calculate the pKa.
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which of the following changes demonstrates a chemical properties?
1. substance breaks in half
2. substance combusts
3. Hammer bounces off substance
4. substance floats in water
Answer:
option 2( substance combusts)
Explanation:
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What quantity of moles of glucose (c6h12o6) in 0.500 l of a 0.400 m l of a 0.400 m?
Quantity of moles of glucose is 0.2 mol.
V (glucose) = 0.500 l; volume of glucose solution
c (glucose) = 0.400 M; concentration of glucose solution
n (glucose) = c (glucose) × V (glucose)
n (glucose) = 0.400 mol/l × 0.500 l
n (glucose) = 0.2 mol; amount of glucose in the solution
Glucose is chemical compound composed of carbon, hydrogen and oxygen atoms connected with covalent bonds.
Volume is the amount of space that a substance occupies.
The mole is the unit of measurement for amount of substance, the mole is an SI base unit, with the unit symbol mol.
The concentration is the amount of solute that has been dissolved in a given amount solution.
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Which metric unit of length or distance is most comparable in scale to each of the following english system units for making measurements?
a. an inch
b. a yard
c. a mile
The metric unit of length or distance is most comparable in scale to each of the following English system units for making measurements of a yard.
What metric measurements of length or distance are used?The most widely used units of distance in the metric measurement system are millimeters, centimeters, meters, and kilometers.
The metric system is a way to measure things.
It is employed in calculations and research all around the world. Here are some instances of measurements made with the metric system;
The unit used to measure lengths and distances is the meter.
In daily life, we use this unit to measure things like the length of a piece of clothing, the distance from school to home, the weight of chocolates, etc.
Eg: 250 grams of potato chips, as an illustration. The unit of weight used here is the gram.
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Consider the process of diluting 1.6 m sulfuric acid (h2so4) solution to prepare 1.5 l of a 0.10 m h2so4 solution.
93 ml of sulphuric acid is to be added to prepare a 1.5 L solution of sulphuric acid.
The concentration of sulfuric acid is C1.
[tex]C_{1} = 1.6 \: mol/g[/tex]
The volume of the solution after dilution is V2.
[tex]V _{2} = 1.5 \: litres[/tex]
The concentration of solution after dilutions is C2.
[tex]C_{2} = 0.10 \: mol/ \: l[/tex]
Let the volume of sulfuric acid be V1.
The volume of the sulphuric acid is,
[tex]V _{1}C_{1} = C_{2}V _{2}[/tex]
[tex]V _{1} = \frac{C_{2} \times V _{2}}{C_{1} }[/tex]
[tex] = \frac{1.5 \times 0.10}{1.6} [/tex]
= 0.093 litres
The volume of the sulphuric acid is 0.093 litres.
The volume of the sulphuric acid in millilitres is,
1 L = 1000 ml
[tex]0.093 \: l = 0.093 \times 1000[/tex]
= 93 ml
The volume of sulphuric acid is 93 ml.
Therefore, for preparing a 1.5-litre solution of sulphuric acid, 93 ml of sulphuric acid is to be added.
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For mercury, the enthalpy of vaporization is 58. 51 kj/mol and the entropy of vaporization is 92. 92 j/k·mol. What is the normal boiling point of mercury?.
The normal boiling point of mercury is 629.68 K.
ΔHvap(Hg) = 58. 51 kJ/mol
ΔHvap(Hg) = 58510 J/mol; the enthalpy of vaporization of mercury
ΔSvap(Hg) = 92. 92 J/K·mol; the entropy of vaporization of mercury
Tvap(Hg) = ΔHvap(Hg) ÷ ΔSvap(Hg)
Tvap(Hg) = 58510 J/mol ÷ 92. 92 J/K·mol
Tvap(Hg) = 629.68 K; the boiling point of mercury
The enthalpy of vaporization is the amount of energy that must be added to a substance in liquid state to transform that substance into a gas.
The entropy of vaporization is proportional to the ratio of the degree of randomness in the vapor and liquid phases.
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Cscl has a crystal stucture where each cl- ion is surrounded by 8 cs+ ions. derive the minimum r/r ration drequired for stability for the general case of cn=8
Cscl has a crystal stucture where each cl- ion is surrounded by 8 cs+ ions.
Caesium (Cs+) and chloride (Cl-) ions make up an equal amount of the crystals in caesium chloride. Two ions' radii—169 pm for Cs+ and 181 pm for Cl-—led to a radius ratio of 0.93, which suggests a body-centered cubic structure with a cubic hole.
The minimal ratio is 169/181 = 0.93 for rCs+/rCl-.
What is CsCl structure?
The physical makeup of calcium chloride, abbreviated CsCl. An unending chain of ions makes up the cubic structure of csCl. The cube's eight corners contain Cs (or Cl) ions, while the cube's centre contains Cl (or Cs) ions (thus it is NOT a body-centered lattice since that requires the SAME ion to occupy the edges and center).
Caesium (Cs+) and chloride (Cl-) ions make up an equal amount of the crystals in caesium chloride. Two ions' radii—169 pm for Cs+ and 181 pm for Cl-—led to a radius ratio of 0.93, which suggests a body-centered cubic structure with a cubic hole.
Thus the minimal ratio is 169/181 = 0.93 for rCs+/rCl-.
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When two amino acid monomers are positioned so that the carboxyl group of one is adjacent to the amino group of the other, they can be joined through a reaction. True or false?.
When two amino acid monomers are positioned so that the carboxyl group of one is adjacent to the amino group of the other, they can be joined through a reaction.
It is True.
What is amino acid?
Amino acid molecules make up proteins. Proteins and amino acids are essential to life. After proteins have been digested or broken down, amino acids are still present. To maintain the body, the human body makes proteins from amino acids: Prepare food.
Taking a supplement containing essential amino acids is wonderful because you can do so anytime you choose. While some athletes prefer to take it with meals or a protein shake, others prefer to take it on an empty stomach in between meals.
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please help me I need to know these answers rn A, B, OR C to each one
Answer:
First one
Explanation:
Because water molecules at the surface of the water puddle attract more to one other than they do to the air molecules above them
Answer:
Question 2:
Cohesion and adhesion
Water has forces of attraction between different molecules, so its molecules are locomotive.
Question 3:
Surface tension
It experiences a perpendicular force which keeps the area of the pepper on surface
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What is the concentration of [h] in molars, millimolars, and micro-molars for a solution of ph 5?
The concentration of [H⁺] is 10⁻⁵ molar, 10⁻² millimolar and 10 micro-molar.
pH is a numeric scale used to specify the acidity or basicity of an aqueous solution.
pH = -log[H⁺], approximately the negative of the base 10 logarithm of the molar concentration of hydrogen ions.
When pH is less than seven (pH<7), solution is acidic (like this example).
pH = 5
[H⁺] = 10⁻⁵ M; concentration of hydrogen ions
Milli (symbol m) is a unit prefix in the metric system denoting a factor of one thousandth (10⁻³).
Micro (symbol µ) is a unit prefix in the metric system denoting a factor of one millionth (10⁻⁶).
[H⁺] = 10⁻⁵ × 10³ mM = 10⁻² mM
[H⁺] = 10⁻⁵ × 10⁶ µM = 10µM
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How many different signals would we expect in the 1h nmr spectrum of nicotinic acid? (give a number.)
four signals that expect in the 1H NMR spectrum.
What is the number of 1H NMR signals produced by each compound?There are four signals in the spectrum: triplet (0.7 ppm), multiplet (1.4 ppm), singlet (1.9 ppm), and triplet (2.2 ppm). Compounds, and should have four signals in the 1H NMR spectrum based on their structures. H NMR is the technique of choice for determining or confirming the structure of organic compounds or those containing protons. A solution-state proton spectrum is relatively fast to acquire when compared to other nuclei, and it can reveal a lot about the structure of a compound.Therefore, the four aromatic protons can be divided into three sets. The two methyl groups are equivalent. There are four signals in total in the 1H NMR spectrum.
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A goldsmith melts 12.4 grams of gold to make a ring. The temperature of the gold rises from 26°C to 1064°C, and then the gold melts completely. If gold’s specific heat is 0.1291 joules/gram degree Celsius and its heat of fusion is 63.5 joules/gram, how much energy is gained by the gold?
The gold gains a total of
joules of energy.
When work is done and heat and light are produced, energy is the quantitative quality that is transferred to the body or to the physical system. Energy can be transformed in form but cannot be created or destroyed, according to the rule of conservation of energy.
How much energy is gained by the gold?
"2450 J"
Two heat flows are involved in this issue.
q = heat to melt the gold plus heat to get it to its melting point.
q = q₁ + q₂
q = mcT + mH
The gold is heated by heat (q1)
Putting the values in by using T = T f - T i.
Calculate T = 1064 - 26 and then subtract.
Values should be entered into the q1 formula at T=1038 °C.
Multiplying q1 = 12.4 0.1291 1038.
q₁ = 1662 J
Gold is melted by heat (q2)
Multiplying with q2 = 12.4 63.5.
q₂ = 787.4 J
requisite heat output (q)
Computing q = 1662 + 787.4 and make the addition.
q = 2450 J (to three significant digits)
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Giving away 100 points Fast
What type of mixture is a solution?
Choose All the right answers
homogeneous mixture
all of the choices
none of the choices
heterogeneous mixture
Answer:
Homogeneous mixtures
Explanation:
This is because the substances are fully mixed together
How much mno2 should be added to excess hcl to obtain 275 ml of chlorine gas at 5.0c and 650 mmhg?
The amount of manganese oxide that should be added is 0.869 moles.
The balanced equation of the reaction is,
[tex]MnO _{2} (s) + 4HCl → MnCl _{2}(aq) + 2 H _{2} O + Cl _{2}(g)[/tex]
The volume of hydrochloric acid that has to be obtained is V.
V = 275 ml
The temperature is T.
T = 5° C = (273+ 5) K = 278 K
The pressure is P.
P = 650 mm of Hg = 0.85 atm
The gas constant is R.
R = 0.0821 L atm/ K mol
The number of moles of chlorine gas that will be produced is,
PV = nRT
[tex] n = \frac{ PV}{ RT }[/tex]
[tex] n = \frac{0.85 \times 0.275}{0.0821 \times 278} [/tex]
n = 0.01 moles
The 0.01 moles of chlorine gas will be produced.
The amount of manganese oxide that should be added to hydrochloric acid to produce 275 ml of fluorine gas is,
[tex]0.01 \: mol \: of \: Cl× \frac{ 1 mmol \: of \: MnO }{mol \: of \: Cl } = 0.01 \: moles \: of \: MnO _{2} \: needed.
[/tex]
[tex]0.01 \: mol \: of \: MnO _{2} = \frac{86.9}{ mol \: of \: MnO _{ 2}}=0.869 \: moles
[/tex]
Therefore, the amount of manganese oxide that should be added to hydrochloric acid to produce 275 ml of fluorine gas is 0.869 moles.
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3. What factors affect solubility?
can anyone help its due today
CHz+ O2-> CO+H2O
Mrs. Jones asked her class to come up with 3 true statements about the chemical equation shown above.
Jenny said that the reactants in the equation were CH₂ and O2 and the products were CO + H₂O.
• Jeffery said that there were 2 atoms of oxygen (O) on the reactants side and 2 atoms of oxygen on the products
. Lisa said the chemical bonds of the reactants were broken to produce one molecule of water (H₂O) and one mo
Who was correct?
All three students were correct.
Jeffery is the only one who is correct since he counted the atoms.
None of the students are correct
Only Jenny and Jeffery are correct since chemical bonds were broken on the products side too. / HELP PLEASE
All three students are correct,
CH₂+ O₂-> CO+H₂O is combustion reaction
What is a chemical reaction?
A process in which one or more substances also called reactants, are converted to one or more different substances, known as products.yes, Jenny's statement is correct. Both CH₂ and O2 are reactants and CO + H₂O are products.⇒ Reactants - The substances that go into a chemical reaction
⇒ Products - The substances produced at the end of the reaction
Jeffery's statement is also correct. Reactant side has O₂ which has 2 a oxygen atoms while product side has H₂O and CO, both have 1 oxygen in each making a total of 2 oxygen atoms on product side.Lisa's statement is also correct. In a chemical reaction bonds are broken within reactant molecules and new bonds are formed within product molecules in order to form a new substance ( here H₂O and CO )Thus we can conclude that all three students were correct.
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The threshold frequency for lithium is 6.00x1014 Hz. If the total energy emitted by a sample of lithium is 8.60 kJ,
a.) Calculate the number of atoms present in the sample?
b.) What is the mass of the sample in gram(s)?
The number of atoms present in the sample is 2.163 x 10²² atoms.
The mass of the sample is 0.25 g.
number of atoms present in the sampleThe number of atoms present in the sample is calculated as follows;
E = nhf
where
n is the number of atoms in the sampleh is Planck's constantf is frequency of the atomE is the total energy emittedn = E/hf
n = (8600) / (6.626 x 10⁻³⁴ x 6 x 10¹⁴)
n = 2.163 x 10²² atoms
Mass of the sample6.02 x 10²³ atoms of Lithium = 6.9 g
2.163 x 10²² atoms = ?
= (2.163 x 10²² atoms x 6.9 g) /(6.02 x 10²³ atoms )
= 0.25 g.
Thus, the number of atoms present in the sample is 2.163 x 10²² atoms. The mass of the sample is 0.25 g.
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If 501 J of heat is available,
what is the mass in grams of
iron (specific heat = 0.450 J/g.
°C) that can be heated from
22.5°C to 120.0°C?
The mass of iron heated during temperature change is 11.42g
Given:
Temperature (denoted by ΔT) = Final temperature – Initial temperature = 120.0°C – 22.5°C = 97.5°C
Quantity of heat involved (denoted by q) = 501 Joules
Specific heat capacity of iron (denoted by C) = 0.45 J/g°C
To find:
Mass of iron (denoted by m) = ?
Formula:
C = q / (mΔT)
Calculation:
On substitution of the given values in the formula to find the mass of iron by first making mass of iron (m) as the subject of the formula
m = q / (CΔT)
m = 501 / (0.45 x 97.5)
m = 11.42g
Result:
The mass of iron heated during temperature change is found to be 11.42g
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Enter the masses of these particles in kilograms. Express the masses of proton and neutron to six significant figures. Express the mass of electron to two significant figures. Enter your answers in kilograms.
The masses of proton ( in kilogram) = 1.67262 × 10−27 kg ( six significant figure).
The masses of neutron ( in kilogram) = 1.67493 × 10−27 kg (six significant figure)The masses of electron ( in kilogram) = 9.1× 10−31 kg (two significant figure)Proton is a stable subatomic particle with symbols p, H+ or 1H+ and a positive charge of +1 e elementary charge. Its mass is slightly less than that of a neutron.
A neutron is a subatomic particle (symbol n or n⁰ ) with a neutral charge and a mass slightly greater than that of a proton. Protons and neutrons form the nucleus. Electrons, protons, and neutrons are the elementary particles that make up atoms. Atoms consist of a central nucleus containing neutrons and protons. Electrons revolve around the nucleus. Electrons are negatively charged, protons are positively charged, and neutrons are neutral. The electron mass is the mass of the rest electron, also known as the invariant mass of the electron.
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2. Question I don’t understand on this one buttt
Answer:
1st question is B
Explanation:
metal is a good conductor of heat and electricity
Ceramics materials such as Al2O3 typically contain anions and cations positioned to optimize electrostatic attraction and minimize repulsion. We generally expect that?
Ionic bonding is found in many ceramic structures such as NaCl, MgO, and Al2O3. Atoms have, unlike electrical charges, making them ions, which create an electrostatic attraction between atoms. This causes bonding between atoms.
The ions pack into a regular arrangement. The nature of the ceramic depends on the size of the ion charges and the size of the ions.
For example, the structure shown left is the rock salt structure, such as that for NaCl.
Covalent bonding is found in many ceramic structures such as SiC, BN, and diamond. The atoms in these ceramics are arranged so that each pair of nearest neighbor atoms forms a chemical bond by sharing a pair of electrons.
The high energy of covalent bonds makes these ceramics very stable with regard to chemical and thermal changes.
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PLEASE HELP ASAP ILL RATE U 5 STARS
According to the given statement the WHMIS symbols and safety and precautions when handling compressed gas:
Compressed gas symbols would be visible on the gas container.Make sure the storage temperature does not go above 52°C (125°F).Move cylinders using handcarts or other cylinder-moving machines.What exactly are WHMIS symbols?Consumer Goods. The Workplace Hazardous Materials Management System (WHMIS) assists in identifying the dangers of items such as chemicals and infectious agents.
Why do we use WHMIS symbols?WHMIS labels are crucial because workplaces require a defined means of identifying hazardous products. The WHMIS system allocates responsibility for classifying any potential hazards to both suppliers and employers.
Safety and precautions when handling compressed gas?Make sure the storage temperature doesn't really exceed 52°C (125°F). Compressed gas cylinders should be stored, handled, and used upright. Never roll, drag, or drop cylinders or allow them to collide. Handcarts or other cylinder-moving equipment should be used.
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Another classmate argues that wind power merits more investment and development, and cites data in Figure 2 as evidence. Evaluate this argument. Do you agree with the classmate? What additional evidence would help strengthen your position?
I agree that wind power merits more investment and development.
Wind power is renewable resource of energy consumption but it has a few problems associated with it.
One of the issue is in the installation of the wind power plants because most of the wind power plants are located in the remote places which required extensive installation cost.
Wind power plants are also a potential threat to the wild life of the local area. Therefore, development is needed to sort this issue.
Also one of the major problems is the damage to the aesthetics and noise pollution due to which wind turbines.
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Please find the below attached image mentioned in the question
What is the force used with a centrifuge to rapidly separate the precipitate from the liquid?.
A centrifuge operates on the sedimentation principle, which states that substances divide according to density under the effect of gravitational force (g-force).
Separation methods include density gradient, phase separation, isopycnic, ultrafiltration, and pelleting.
Centrifugation is a process that uses centrifugal force to separate mixtures. A centrifuge is a gadget that, often powered by an electric engine, rotates an item around a given axis, such as a rotor.
Centrifugation protocols generally specify the relative centrifugal force (rcf) and the magnitude of acceleration in g multiples (g-force).
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Polartiy in a sentance
A tiny permanent magnet is always susceptible to demagnetization or having the polarity of the magnet reversed by lightning.
Even a permanent magnet is sensitive to induction, which can cause its polarity to change and become stronger, weaker, or even reversed.
What is polarity so crucial to life?Not just in multicellular creatures but also in individual cells and subcellular structures, polarity enables the development of functional complexity. Polar organisation enables physical relationships between areas with various functions in a way that supports function integration across the entire organism.
The polarity of water causes hydrogen bonds to form when adjacent water molecules are drawn to one another by their opposing charges. Other polar molecules and ions, such as many biomolecules including sugars, nucleic acids, and certain amino acids, are likewise drawn to or attracted by water.
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Which factor(s) will affect the rate of diffusion of a gas? (select all that apply)
The factors that will affect the rate of diffusion of gas are as follows:
The membrane's thicknessThe membrane's surface areaThe diffusion coefficient of the gas in the substance of the membraneThe difference in the gas's partial pressure between the membrane's two sides.The density of the gas.What is the Rate of Diffusion?The random movement of particles during the net migration of material from a region of high concentration to a region of low concentration is known as diffusion in a gas. Every particle in a particular gas keeps striking other particles. The particles bounce off the edge of their container and each other more frequently in areas of the gas with higher particle densities than they do in areas with lower densities. The speed at which these process proceeds is referred to as the rate of diffusion. The rate of diffusion for a gas is inversely related to the square root of the gas density.To learn more about the Rate of Diffusion, refer to:
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What could happen if a person conducts an investigation but doesn't follow the steps of
the scientific method?
The action of investigating something or someone; formal or systematic examination or research.
There are five main steps involved in the scientific method: stating the problem, forming the hypothesis, collecting the data by observing and experimenting, interpreting these data, and drawing conclusions.Define a Question to Investigate. As scientists conduct their research, they make observations and collect data. ...Make Predictions. Based on their research and observations, scientists will often come up with a hypothesis. ...Gather Data. ...Analyze the Data. ...Draw Conclusions.Scientific investigation is a quest to find the answer to a question using the scientific method. In turn, the scientific method is a systematic process that involves using measurable observations to formulate, test or modify a hypothesis. Finally, a hypothesis is a proposed explanation for some observed phenomenon, based on experience or research.Scientific investigation is what people like you and me use to develop better models and explanations for the world around them.
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How many constitutional isomers are possible if propane is dichlorinated?
1 2 3 4 5
The correct answer of this question is 4.
If propane is dichlorinated, the resulting structural/constitutional isomers are the positional ismoers having different IUPAC names.
The resulting possible isomers are:-
1-1, dichloro propane
1-2, dichloro propane
2-2, dichloro propane
1-3, dichloro propane
Thus, we have 4possible constitutional isomers of dichlorinated propane.
Structural isomers or constitutional isomers are also known as constitutional isomers as they have same molecular formula but different in their structure or have different structural formula.
Structural isomers are further divided into five types:-
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Give two differences between column 1 and group 1
A 15.33 gram sample of copper is heated in the presence of excess oxygen. a metal oxide is formed with a mass of 19.20 g. determine the empirical formula of the metal oxide.
The empirical formula will become CuO.
The formula of a specific chemical compound in its most basic form is known as an empirical formula. It's a condensed whole number ratio of the atoms in a formula.
Mass of copper = 15.33g
Mass of oxygen= 19.20g-15.33g = 3.87g
Calculations:
Moles of copper= 15.33 /63.54
Moles of copper =0.24
Moles of oxygen= 3.87 / 16
Moles of oxygen = 0.24
The number of moles of copper and oxygen are same. Hence, the empirical formula will become CuO.
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What is the charge of an atom with and equal number of protons and electrons
