From the Henderson- Hasselbalch equation, the pH of a solution is 3.36.
How can the pH of a solution made from a weak acid and its conjugate base be calculated?The pH of a solution made from a weak acid and its conjugate base can be calculated using the Henderson- Hasselbalch equation.
The Henderson- Hasselbalch equation is given below as follows:
pH = pKₐ + log ([A⁻]/[HA])where;
pKa = - log(Ka) of hydrofluoric acid[A⁻] = concentration of salt of conjugate base, NaF[HA] = concentration of hydrofluoric acidpKa of HF = 3.8
[A⁻] = 0.21 M
[HA] = 0.57 M
pH = 3.8 + log (0.21/0.57)
pH = 3.36
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what indicates the follwing percentage of the natural occurance of an isotope ofc an element
Natural abundance indicates the following percentage of the natural occurrence of an isotope of an element on the planet.
Natural abundance is defined as the relative amount of the isotopes of an element which occurs in nature. It is also known as geonormal abundance.
Natural abundance is also represented as percentage value.Relative atomic mass can be determined by using the natural abundance value of an isotope of an element.Relative atomic masses of any isotope can be easily determined if we know the atomic masses and their respective abundances.The formula to calculate the natural abundance of an element with two isotopes is given as :
x + (1 - x) = 1
Where,
x represents the fractional value of isotope-1 and 1 - x represents the fractional value of isotope-2.
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Which identifies an oxidation-reduction reaction?
a double replacement reaction
a neutralization reaction
a reaction in which oxidation numbers change
a reaction in which no electrons are transferred
Answer:
c. a reaction in which oxidation numbers change
Explanation:
In an oxidation reaction there is loss of electrons whereas in a reduction reaction there is gain of electrons. Therefore, a reaction in which oxidation numbers change identifies an oxidation-reduction reaction.
Answer:
C: a reaction in which oxidation numbers change.
Explanation:
an atom has a mass number of 55. its number of neutrons is the sum of its atomic number and five. how many protons, neutrons, and electrons does this atom have? what is the idetity of this atom
Atom consists of electron, proton and neutron. The number of proton and electrons is 25. The number of neutron is 30. The given element is manganese, Mn.
What is atom?Atom is the smallest particle of any matter. Atom combines to form element and element combine to form molecule or compound.
Mass number =Number of neutrons+ number of protons
Mass number =55
Number of neutrons=atomic number+5
Substituting the given values in the above formula
55 =atomic number+5+ number of protons
50=2×atomic number
Atomic number=25
Therefore, the number of proton and electrons is 25. The number of neutron is 30. The given element is manganese, Mn.
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Liquid octane (CH 3 (CH 2 ) 6 CH 3 ) will react with gaseous oxygen (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H2O) Suppose 8.0 g of is with 39.5 of oxygenCalculate the minimum mass of octane that could be left over by the chemical reaction. Be sure your answer has the correct number of significant digits
Answer:
Octane can be written as C8H18.
The balanced equation for combustion of octane is:
2C8H18 + 25 O2 ==> 16CO2 + 18H2O
Finding the limiting reactant:
10.g C8H18 x 1 mol C8H18 / 118 g = 0.0847 moles (÷2->0.042)
61.2 g O2 x 1 mol O2 / 32 g = 1.91 moles (÷25->0.077)
C8H18 is the limiting reactant and will dictate the maximum amount of H2O that can form.
Maximum H2O formed:
0.0847 moles C8H18 x 18 moles H2O / 2 moles C8H18 x 18 g H2O/mol = 14 g H2O formed (2 sig.figs.)
Explanation:
hope it can help you !
how much will the temperature of 5.00g of silver decrease if it loses 982 j of heat ?
The temperature of the silver will decrease by -828.7 °C
if it loses 982 J of heat energy
How do I determine the temperature change?From calorimetry, we understood that heat released or lost is given by:
Q = MCΔT
Where
Q is heatM is the mass C is the specific heat capacityΔT is the temperature change
With the above formula, we can determine the temperature change of the silver. This is illustrated below
Mass of silver (M) = 5.00 gHeat lost (Q) = -982 JSpecific heat capacity of silver (C) = 0.237 J/gºC Temperature change (ΔT) = 124Q = MCΔT
-982 = 5 × 0.237 × ΔT
-982 = 1.185 × ΔT
Divide both side by 1.185
ΔT = -982 / 1.185
ΔT = -828.7 °C
Thus, the temperature will decrease by -828.7 °C
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How many moles are in a system that is 223 K, with an internal pressure
of 10 atm, in a fixed container that is 27 L
O 14.75 mol
O 1.21 mol
O 825 mol
5.42 mol
* 2 points
Answer:
A.) 14.75 mol
Explanation:
To find the amount of moles, you need to use the Ideal Gas Law equation:
PV = nRT
In this equation,
-----> P = pressure (atm)
-----> V = volume (L)
-----> n = number of moles
-----> R = Ideal Gas Constant (0.08206 L*atm/K*mol)
-----> T = temperature (K)
You can plug the given values and the constant into the equation and simplify to find "n".
P = 10 atm R = 0.08206 L*atm/K*mol
V = 27 L T = 223 K
n = ? moles
PV = nRT <----- Ideal Gas Law
(10 atm)(27 L) = n(0.08206 L*atm/K*mol)(223 K) <----- Insert variables
270 atm*L = n(18.299 L*atm/mol) <----- Mutliply
14.75 mol = n <----- Divide both sides by 18.299
The pressure 40.0 m under water is 494 kPa. What is this pressure in bar? =
One kilopascal of pressure is 0.01 bar pressure. Thus 494 kilopascal pressure is 4.94 bar pressure.
What is pressure?Pressure is an intensive quantity measuring the force produced on body by a mechanical stress. Pressure of a substances is inversely proportional to the volume and directly proportional to the temperature.
Pressure of a substance can be expressed in different units where, the SI unit is atm or atmospheric pressure. Other units are bar, pascal, kilopascal etc.
One kilopascal pressure = 0.01 bar. Hence, 494 kilopascal is:
(494 Kpa × 0.01 bar) / 1 kpa = 4.94 bar.
Hence, 494 Kpa pressure is 4.94 bar.
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How many atoms are there in 65.0 grams of methane, CH4?
Methane (CH4) is a hydrocarbon that is mostly found in natural gas and has a molecular weight of 4.051747moles per 65.0 grams.
What effects has methane on people?Methane concentrations above a certain threshold can affect how much oxygen is breathed in. This can include headaches, face flushing, memory loss, vision issues, slurred speech, mood swings, nausea, and vomiting. Serious cases could result in altered breathing and heart rate, balance issues, numbness, and coma.
Why is methane bad? What is it?The gas methane (CH4) is colorless, odorless, and very combustible. Carbon and hydrogen are its main ingredients. According to us Environmental Protection Agency, it is also a powerful greenhouse gas, meaning means it influences climate change by causing more warming.
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2
A chamber contains equal molar amounts of H₂, N₂, and O₂. If the
total chamber pressure is 2.00 atm, then the partial pressure of h2 is
The mole fraction must be known in order to determine the partial pressure of h2.
What is molar fraction?
The amount of a component, ni, expressed in moles, divided by the sum of all the components, ntot, likewise stated in moles, is known as the mole fraction or molar fraction (xi or I).
Below is an example of this phrase:
xi=ni/ntot
What is partial pressure?
If a container is filled with multiple gases, each gas will exert pressure, which is known as partial pressure. Its partial pressure is the pressure of any gas contained within the container.
Using this mole fraction formula:
=Xa/Xa+Xb+Xc
=XH2/XH2+XN2+Xo2
=1/3
=1/3×2=2/3
The partial pressure of h2 is 2/3
Therefore, the partial pressure of h2 is 2/3.
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Balance the equation HC2H3O2(aq)+Ca(OH)2(aq)→
The reaction of acetic acid and calcium hydroxide is an example for double displacement reaction. The balanced equation can be written as,
2 HC2H3O2 (aq) + Ca(OH)2 (aq) ----------> Ca(C2H3O2)2 (aq) + H2O (l)
What is double displacement reaction?
The double displacement reaction is a type of reaction in which the cations and anions of the reacting species exchange with each other to form two new compounds.
In the reaction of acetic acid and calcium hydroxide the cationic part of calcium hydroxide reacts with anionic part of acetic acid to give calcium acetate and the anionic part of calcium hydroxide reacts with cationic part of acetic acid to give water. This type of reaction between acetic acid and calcium hydroxide is called double displacement reaction.
Therefore, the balanced equation for double displacement reaction of acetic acid and calcium hydroxide can be written as,
2 HC2H3O2 (Aq) + Ca(OH)2 (aq) ---------> Ca(C2H3O2)2 (aq) + H2O (l)
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Using the table from the previous question determine which substance would sink if placed in the pan of mercury.
Iron
Copper
Lead
Gold
All of them
Any object which have less density than the mercury will float in it and which have higher density will sink on it. Here, gold has higher density than mercury. Thus it will sink on mercury.
What is density?Density of a substance is the measure of its mass per volume. Thus it says about how much denser the substance is in a specific volume. The ratio of density of an object to the density of water is called specific gravity.
The density of mercury is 13.4 g/ml. Any object which is less dense than mercury will float on its surface whereas, objects which have higher density than mercury will sink on it.
The density of gold is 79.3 g/ml. All other given metals iron, lead and copper have a density less than that of mercury. Hence the substance which sink on mercury is gold. Option Dis correct.
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For this experiment, various solutions were compared to look for precipitation or bubbling. What is the independent variable in the experiment?
A. the precipitates or bubbles
B. all the solutions
C. only the pickle crisp and vinegar
Answer:
A
Explanation:
Independent variable: the surface of the slope rug, bubble wrap and wood
For this experiment, various solutions were compared to look for precipitation or bubbling. The precipitates or bubbles are the independent variable in the experiment. Therefore, option B is correct.
What is precipitation ?The term precipitation is defined as a solid produced by a change in a solution, often due to a chemical reaction or change in temperature that decreases solubility of a solid.
A substance separated from a solution or suspension by chemical or physical change, usually as an insoluble amorphous or crystalline solid.
A compound may precipitate when its concentration exceeds its solubility. This can be caused by temperature changes, solvent evaporation, or solvent mixing. A strongly supersaturated solution precipitates more quickly.
Independent variable are the surface of the slope rug, bubble wrap and wood.
Thus, option B is correct.
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A gas is heated from 213.0 K to 498.0
K and the volume is increased from
23.0 liters to 55.0 liters by moving a
large piston within a cylinder. If the
original pressure was 1.15 atm, what
would the final pressure be?
Answer:
0.5 7.0 there is so many results
Explanation:
its very simple
4. When a beaker of water is heated its volume increases a little. What is happening to
the particles in the liquid?
a. speed up and move closer
b. slow down and move closer
c. speed down and move farther apart
d. slow down and move farther apart
Answer: They speed up and move farther apart.
Explanation: With an increase in temperature, the particles move faster as they gain kinetic energy, resulting in increased collision rates. The volume increases as they start moving apart from each other.
Is the structure of C4H6 rigid? (i.e. is it unable to rotate/move?) If not, which part of the molecule is not rigid? Try to describe the shape of this molecule.
The molecular structure of C4H6 rigid is Not rigid.
The Schrödinger equation, a quantum mechanical equation for the motion of electrons in the field of nuclei, can theoretically be used to identify the molecule structure. The bond lengths and bond angles in a molecular structure are those where the molecular energy is lowest. The numerical solution of the Schrödinger equation to determine structures has developed into a highly developed technique requiring the use of computers and supercomputers.
Either either neutron diffraction or microwave vibration-rotation spectra are used to determine the nuclear locations within a molecule. X-ray diffraction investigations can be used to analyse the electron cloud that surrounds a molecule's nucleus.
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Is it polar or non polar ?
In the SI system of units [International System of Units], the mole is one of seven base units. It is frequently used in chemical calculations. However, a mole of something is just a particular quantity of it. It is not a unit of measure in the way that meters, seconds, and kilograms are. Calculations performed with the number of moles of a substance could also be performed with the number of particles of a substance. Based on this information, do you think that the mole should be considered a base unit in the SI system? Explain why or why not.
A Mole should not be considered a base unit in the SI system.
SI system is a metric system which is also known as the International system of units. Most of the measurements across the globe is measured by SI system. SI units are used in nearly every part of the globe, such as science, technology, mathematics and many more. The system includes coherent units known as derived units.
A Mole is not considered as any property of the units and also it is not a base unit.Moles can be considered for chemical and physical comparison.A Mole of a substance can indicate the number of particles of that substance.Learn more about SI system from the link given below.
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Choose the colder temperature.
A) -30°F
B) 20°F
[tex]-6.66^{0} C[/tex][tex]-30.4^{0} C[/tex]Between the two options, the option A shows the colder temperature, that is [tex]-30^{o}[/tex] F.
How to determine the colder temperature?
Both Fahrenheit and Celsius employ different temperatures as the water's freezing and boiling points, as well as differing sizes for their degrees. While water freezes at zero degrees Celsius and boils at one hundred degrees C, it does so at 32 degrees Fahrenheit and two hundred and twenty degrees F, respectively. You can see that although Fahrenheit has 180 ° between the freezing and boiling extremes, Celsius has 100 degrees. The difference between one degree Celsius and one degree Fahrenheit is 1.8.
On converting [tex]-30^{o}[/tex] F to Celsius we get, [tex]-30.4^{0} C[/tex]
and on converting [tex]20^{o} F[/tex] to Celsius, we get, [tex]-6.66^{0} C[/tex]
Hence, we can say [tex]-30.4^{0} C[/tex] is colder temperature than [tex]-6.66^{0} C[/tex].
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2 H + 3 H -----> 2 He + 1 n
1 1 4 0
Explain in 1-2 sentences: Is the above equation an example of fission or fusion? How do you know? Give at least 2 reasons why.
The given reaction is an example of nuclear fusion.
This is because two lighter hydrogen atoms fuse to give a heavier helium atom. There is also an increase in the atomic number of the product.
What are nuclear fission and nuclear fusion reactions?Nuclear fission reactions are reactions in which the nucleus of large atoms are split into nucleus of two or more smaller atoms.
For example, uranium atoms split into krypton and barium.
Nuclear fusion reactions involve the nucleus of two or more smaller atoms combining to give an atom of a larger nucleus.
For example, hydrogen atoms fuse to give a helium atom.
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if some filtrate splattered out of the beaker while it was heated how would this affect the measured results
Answer:
it will be all water and it needs to cool of
Hydrogen gas is collected over
water at a total pressure of 1.00
atm. The volume of hydrogen
collected is 35.0 mL at 27.0°C. How
many grams of hydrogen gas was
collected?
Answer:21.0 mL
shorten math
The area of human activity that consumes the most energy is____.
a. transportation
b. building construction and operation
c. industrial manufacturing
d. heavy engineering and infrastructure
The area of human activity that consumes the most energy is building construction and operation. Option B.
Humans impact the physical environment in many ways including overpopulation pollution burning fossil fuels and deforestation. Such changes are causing climate change soil erosion declining air quality and undrinkable water. Human geography includes the study of all human activities and their effects on the natural environment.
The impact of early human societies on the natural environment was minimal due to the presence of a small number of nomads, mainly through hunting, fishing, and gathering. The human activity system is a fictitious system that represents goal-oriented human activity. These systems are fictitious in the sense that they are intelligent constructs and do not describe actual real-world activities.
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joules to warm 59.5 mL of water ( density=1.00g/mL ) from 26.5 ∘C to 100 ∘C and vaporize it at 100 ∘C
Knowing the heat capacity of the water, we know that the heat absorbed is 1.83 * 10^4 J.
What is the heat of the water?We know that water can be able to absorb heat when it is heated and the heat that is absorbed can be able to change the state of the water. We are now going to see how we can be able to obtain the heat that is absorbed by the water.
Then;
H = mcdT
H = heat absorbed
m = mass of the water
c = heat capacity of water
dT = temperature change
Given that mass of the water = 59.5 g we can write;
H = 59.5 g * 4.18 * (100 ∘C - 26.5 ∘C)
H = 1.83 * 10^4 J
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Fats can be broken apart in a process called saponification. In which solution will this process most likely occur?
an aqueous solution of a strong acid at a temperature near 0°C.
an aqueous solution of a strong base at a temperature near 100°C
an aqueous solution of a mild acid at room temperature
an ether solution that contains carbon tetrachloride at room temperature
Fats can be broken apart in a process called saponification, which most likely will occur in an aqueous solution of a strong base at a temperature near 100°C (Option B).
What is the chemical process of saponification?The chemical process of saponification refers to the hydration capable of breaking down different types of ester chemical bonds between the subunits of a lipid molecule, which may be composed of fatty acid chains and or a glycerol backbone.
The chemical process of saponification is enhanced by the presence of a strong base and high temperature capable of denaturing the chemical bonds of the lipid molecule.
Therefore, with this data, we can see that the chemical process of saponification is most likely to occur in presence of a strong base that breaks the ester bonds of the lipid molecules, which are generally composed of a glycerol backbone.
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7. Pemican is a concentrated food traditionally used by Fir:
What specific kind of potential energy does pemican have
of dietary calories?
A. kinetic energy
B. elastic potential energy
C. chemical potential energy
D. gravitational potential energy
The specific kind of potential energy does pemican have of dietary calories is chemical potential energy.
What is potential energy?
potential energy, stored in energy that depends upon to the relative position of the various parts of a system. A spring has more potential energy when it is the compressed or stretched.
Sol-Chemical energy is simply energy that is stored to in compounds or elementary are specifically in the atomic bonds that connect atoms and the molecules. In food, it is a form of potential energy id because it's stores away.
The type of potential energy is that exists within chemical bonds, and it is released when of those bonds are broken, is called chemical energy. Chemical energy is the responsible for providing is living cells with energy from food. The release of energy occurs in when the molecular bonds are within food molecules are broken.
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Which is more soluble in water, Calcium Carbonate or Calcium Hydroxide, and why?
Answer:
Calcium Hydroxide is more soluble in water
Explanation:
Calcium Hydroxide is more soluble in water as all group 2 carbonates are not very soluble while Group 2 hydroxides are moderately soluble.
PLEASE HELP
Can someone explain this?
Commercial concentrated nitric acid, HOg, is 15.8 M. What volume of concentrated HNO; would be required
to prepare 842 mL of 7.77 M HNO}?
Be sure to enter a unit with your answer.
The volume of the solution is obtained as 414 mL.
What is the required volume?Often times, we want to reduce the concentration of a solution and the way that we can be able to do that is by the process of dilution. When we say dilution what it means is that we are going to increase the volume of the solution.
In this case;
C1 = initial concentration
V1 = initial volume'
C2 = final concentration
V2 = final volume
Then;
C1V1 = C2V2
V1 = C2V2/C1
= 7.77 M * 842 mL/ 15.8 M
= 414 mL
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Magnesium acts similar to sodium when forming an ionic bond in terms of losing or gaining electrons.
What is the most likely way in which an atom of magnesium (Mg) will satisfy the octet rule when it forms bonds?
The most likely way in which an atom of magnesium (Mg) will satisfy the octet rule when it forms bonds is by losing two electrons.
What is the octet rule?The octet rule is described as a chemical rule of thumb that reflects the theory that main-group elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas.
The octet rule is held responsible for the relative inertness of the noble gases and the chemical behavior of certain other elements.
Magnesium (Mg) will satisfy the octet rule when it forms bonds is by losing two electrons.
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Answer:
by losing two electrons
Explanation:
I got it right on edge 2023
good luck
How many moles are there in 215 grams of water?
Answer:
13.89
Explanation:
13.89 moles (mole =mass)
points)
1. In part 1, you collected data about how the amount of sugar affects the amount of gas produced.
Analyze those data and draw a conclusion. (20 points)
a. Wnat gas inflated the balloons? (2 points)
Since carbohydrates are essential biomolecules the action of sugars fluctuates when enzymes consume substrates of glucose molecules.
Gas pressure is the pressure created by the collision of gas particles with an object. Inside the balloon, gas particles collide with the inner wall of the balloon. It's these collisions that keep the balloon inflated. When carbon dioxide gas fills the balloon, it inflates. The more gas produced, the bigger the balloon will inflate.
The chemical reaction between baking soda and vinegar will inflate the balloon as long as the baking soda and vinegar react. Force Balance: The pressure inside the inflated balloon is greater than the pressure outside. The balloon is stable because the expansion force due to the pressure difference balances the contraction force due to the surface tension of the rubber.
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