Answer:
Explanation:
was up yo boi
• When dissolved 1.93 g of HNO₂ acid (M.W = 47) and dilute
the volume to 500 ml the H concentration in the solution was
7.63X10³ M, calculate the dissociation constant of K
a?
The dissociation constant of Ka is 7.83 × 10³ .
What does molar mass mean?In chemistry, the molar mass of a chemical compound is determined by dividing its mass by the quantity of the material, or the number of moles in the sample, expressed in moles. A substance's molar mass is a bulk attribute, not a molecular one. Mass per mole is one way to define molar mass. Molar mass is, in other words, the total mass of all the atoms in a substance that makes up a mole. It is quantified in grams per mole.
Molar mass is shown for substances or molecules. The molar mass of a single element or atom would simply be that element's mass represented in atomic mass units.
Mass of HN[tex]O_{2}[/tex] = 1.93g
Volume of solution = 500 ml
[tex]H^{+}[/tex] equilibrium = 7.63 × [tex]10^{3}[/tex] m
Molarity of HN[tex]O_{2}[/tex] = mol [tex]HNO_{2}[/tex] /vol in2
mol [tex]HNO_{2}[/tex]
= mass(g) / molar mass
= 1.93/42.0129 g/mol
= 0.04105
Hence ,
molarity of HNO2
= 0.04105/0.5L
= 0.0821 M
Reaction
HNO2 ⇄ H+ NO2
x = [tex]H^{+[/tex] = 7.63 × [tex]10^{3}[/tex] M
= 0.0821 - 7.63 [tex]10^{3}[/tex]
= 0.0821 - 0.00763
= 0.0745 m
[tex]H^{+}[/tex] = 7.63 × [tex]10^{3}[/tex]
[tex]NO_{2}[/tex] = x = 7.63 × [tex]10^{}[/tex]³
Dissociation of constant ka
ka = [tex]H ^{+} NO_{2} ^{-}[/tex]/ HNO²
=[tex]10^{3}[/tex] × 7.83
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A 8.54 g solid sample of sodium hydroxide is dissolved in 111.5 g of water in a coffee cup calorimeter. By how many degrees will the temperature of the solution rise? The heat of solution for solid sodium hydroxide is 44.5 kJ/mol.
Based on the heat of solution, the increase in temperature rise when an 8.54 g solid sample of sodium hydroxide is dissolved in 111.5 g of water in a coffee cup calorimeter is 95.48 K.
What is the temperature rise when an 8.54 g solid sample of sodium hydroxide is dissolved in 111.5 g of water in a coffee cup calorimeter?The increase in temperature rise when an 8.54 g solid sample of sodium hydroxide is dissolved in 111.5 g of water in a coffee cup calorimeter is determined using the formula below:
ΔH = m * c * ΔTmass of water = 111.5 g
c = 4.18 J/g.K
Heat of solution, ΔH = 44.5 kJ/mol
ΔT = ?
Mole of NaOH in 8.54 g NaOH = 8.54/40
Mole of NaOH in 8.54 g NaOH= 0.2135 mol of NaOH
Solving for ΔT;
44.5 kJ/mol = 111.5 * 4.18 * ΔT
44.5 kJ/mol = 466.07 * ΔT
ΔT = 44.5 / 466.07
ΔT = 95.48 K
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A scientist wants to test the effects of different potassium chloride, KCI, solution concentrations. Potassium chloride is sometimes used to treat conditions that result from potassium depletion, such as cardiac or kidney disease. The scientist dissolves 255 g KCI to make a 3.20 L solution. Use the space provided to calculate the molarity of the potassium chloride solution.
According to the given statement the molarity of the potassium chloride solution is 1068.75 moles KCL .
What do molarity mean?The molarity of a material refers to the amount of it that is present in a given solution volume (M). Molarity is indeed the measure of how many moles of a solute are contained per liter of a solution. It is commonly referred to as the molar concentration of the solution.
Briefing:To find the number of moles of potassium chloride, your solute, use the compound's molar mass, the mass of one mole of potassium chloride
1 mole of KCl = 74.55 g
255 g/1mole of KCL
255g / 74.55g
=3.420 g
Molarity is expressed per liter of solution. Since you dissolve 3.420 moles of potassium chloride in 3.20 mL of solution, that 1.0 L will contain
[tex]$1.0 \mathrm{~L} \cdot \frac{10^3 \mathrm{mL}}{1L} \cdot \frac{3.420\mathrm{moles}}{3.20 \mathrm{mL}}$[/tex] = 1068.75 moles KCL
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what us a bond between a positive and a negative ion called
Answer: ionic bond
Explanation:
) Describe five mechanisms that promote aggregation in soils.
Answer:
wetting and drying
cultivation
freezing and thawing
particle size
Earthworm
Seawater contains roughly 28.0 g of NaCl per liter. How many moles of NaCl is in each liter of seawater?
Answer:
About 0.479 moles
Explanation:
What is the net ionic equation for Fe(NO3)3+3NaOH=Fe(OH)3+3NaNO3
The three rules for writing net ionic equations are actually quite simple. Consider only breaking up the (aq) substances. Only strong electrolytes should be broken up. Any ions that appear on both sides of the equation should be removed.
What exactly is a net ionic equation?A net ionic equation is defined as an equation that depicts only the molecules or ions that are actively involved in the reaction or those that change. The spectator ions are not present in this equation. First, write and balance the molecular equation, ensuring that all formulas are correct. Then, using all aqueous substances as ions, write the ionic equation. Carry any coefficients through. Finally, remove spectator ions from the equation and write the net ionic equation. The purpose of writing a chemical equation is to express what we believe is going on in a chemical reaction. One of the most useful applications of the principal species concept is in the formulation of net ionic equations.To learn more about net ionic equation, refer to:
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Wine goes bad soon after opening because the ethanol CH3CH2OH in it reacts with oxygen gas O2 from the air to form water H2O and acetic acid CH3COOH, the main ingredient of vinegar.
What mass of water is produced by the reaction of 6.5g of ethanol?
Round your answer to 2 significant digits.
The mass of water produced in the oxidation reaction is 2.5 g.
What is oxidation reaction of ethanol?
Oxidation reaction of ethanol occurs when ethanol comes in contact with oxygen, producing water and acetic acid. This type of reaction can also produce carbon dioxide and water.
The oxidation reaction of ethanol and oxygen is given as;
CH₃CH₂OH + O₂ -----------> H₂O + CH₃COOH
Molecular mass of ethanol;
CH₃CH₂OH = (12) + (3 x 1) + (12) + (2 x 1) + (16) + (1) = 46 g/mol
Molecular mass of water;
H₂O = (2 x 1) + (16) = 18 g/mol
From the reaction above, we can infer the following;
46 g of ethanol ---------> 18 g of water
6.5 g of ethanol ---------?
= (6.5 x 18) / 46
= 2.54 g of water
Thus, the mass of water that is produced by the reaction of 6.5g of ethanol is 2.5 g.
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Which of the following statements concerning quantum mechanics is/are true?
1. The behavior of submicroscopic particles can sometimes be described as waves.
2. Quantum mechanics limits us to making statistical statements about the location of an electron in an atom.
3. The uncertainty principle is important only for particles of very small mass, such as the electron.
1. The behavior of submicroscopic particles can sometimes be described as waves - True
2. Quantum mechanics limits us to making statistical statements about the location of an electron in an atom - True
3. The uncertainty principle is important only for particles of very small mass, such as the electron - True
What is quantum mechanics?Quantum mechanics is the branch of science that deals with the particles that we have in the atom. The study of quantum mechanics led us to appreciate the position of the electrons that are found in the atom.
The spear head of the study of quantum approach to the atom was Erwin Schrodinger when he proposed the wave mechanical model of the atom.
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Interpret the following equation for a chemical reaction using the coefficients given: N2(g) + 2 O2 (g) = 2 NO2 (g)
Interpretation of equation for a chemical reaction using the coefficients
On the particulate level: 1 molecule of N₂(g) reacts with 1 molecule of 2O₂(g) to form 2 molecules of NO₂(g).
On the molar level: 1 mole of N₂(g) reacts with 1 mole of 2O₂(g) to form 2 moles of NO₂(g).
What is a chemical reaction?chemical reaction: a process in which one or more substances—the reactants—are changed into one or more additional substances—the products. Chemical elements and compounds are both substances. To produce different substances as products, a chemical reaction rearranges the atoms that make up the reactants. Technology, culture, and life itself are all influenced by chemical reactions.
Numerous activities that involve chemical reactions have been known and used for thousands of years, including burning fuels, smelting iron, creating glass and pottery, brewing beer, and producing wine and cheese.
Numerous intricate processes that take place in all living systems, as well as the Earth's geology, atmosphere, and oceans, involve chemical reactions.
We have given the following chemical reactions
N₂(g) + 2O₂(g) → 2NO₂(g)
The changes in two levels, the particulate level and the molar level, can be interpret using the balanced equation.
On the particulate level, we always consider discrete molecules.
On the particulate level: 1 molecule of N₂(g) reacts with 1 molecule of 2O₂(g) to form 2 molecules of NO₂(g).
We think in terms of moles On the molar level, considering 1 mole of particles = 6.02 × 10²³ particles.
On the molar level: 1 mole of N₂(g) reacts with 1 mole of 2O₂(g) to form 2 moles of NO₂(g).
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EASY CHEMISTRY QUESTIONS FOR 100 POINTS
Answer:
Can't decide, Can't decide, and mixture.
Hopefully this is right. Technically you also can't decide on C but the chances of it being a pure substance are very low.
Explanation:
Technically, you can't decide on any of them since you have no idea of the actual compositions. Even if the ratio of the elements in grams are the same, there is no guarantee that the elements are chemically combined. For example, if you are given the info that a box contains 1 gram of hydrogen and 8 grams of oxygen, it could contain 9 grams of water, or 1 gram of hydrogen gas and 8 grams of oxygen gas. Knowing that water contains 1 gram of hydrogen and 8 grams of oxygen per 9 grams of oxygen doesn't help you determine if a container with 2 grams of hydrogen and 8 grams of oxygen has hydrogen peroxide or just a mix of the two gasses.
For A, it could be a pure substance since the ratio of E1 to E2 is twice the ratio of E1 to E2 in substance X. You can't really decide though
For B, it could be a pure substance since the ratio of E1 to E2 is four times the ratio of E1 to E2 in substance X. You can't really decide though
For C, It is very likely to be a mixture, since the ratio of E1 to E2 in substance C is 2.7 times that of the ratio of E1 to E2 in substance X
Copper metal has a density of 8.96 G/cm^3. What volume (in cm) does a 26.0 g piece of Cu occupy?
The volume (in cm) does a 26.0 g piece of Cu is 2.90 cm³.
Density is the substance's mass in keeping with a unit of volume. The image most often used for density is ρ, despite the fact that the Latin letter D also can be used. Mathematically, density is defined as mass divided by volume.
Mass, extent, and density are three of an object's maximum simple residences. Mass is how heavy something is, quantity tells you how big it is, and density is mass divided through volume. although mass and extent are houses you deal with each day, the concept of density is a little much less obvious and takes a cautious idea.
The components for density are the mass of an object divided by means of its volume. In equation shape, it is d = m/v, in which d is the density, m is the mass and v is the volume of the object. the standard devices are kg/m³.
Density = mass / volume
Volume = mass/density
= 26/8.96
= 2.90 cm³
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A mineral is dropped into a weak acid and bubbles form.
What type of property does this demonstrate?
Compare the behavior of the mixture of gases with each solitary gas in the presence of flame.
The heat made by a mixture of gases is less than that produced by solitary gases of hydrogen or oxygen.
How are the gases behave in the mixture?The property becomes a solution of a homogeneous mixture. Some of the effects of gas mixtures are easy to control. if we know the composition of the gases in the mix. In gas mixtures, all components in the gas phase can be used separately. The atmosphere is a mixture of different gases. The part, usually present in solution, first has to be atomized in a flame. Premixed combustion flame, a mixture of fuel and oxidant gas, and diffusion. compared to liquid streams, is relatively simple because the bulk characterization of a single phase is implicit. However, when gas. The heat produced by a mixture of gases is less than that produced by solitary gases. of hydrogen or oxygen.
so we can conclude that the flame appears yellow if there are impurities in the air whereas a pure hydrogen gas flame will not produce any smoke.
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how many molecules O2 has in 32 oxygen?
Answer:
One mole of oxygen gas, which has the formula O2, has a mass of 32 g and contains 6.02 X 1023 molecules of oxygen but 12.04 X 1023 (2 X 6.02 X 1023) atoms, because each molecule of oxygen contains two oxygen atoms.
When the solid and liquid phases of a substance are present. simultaneously, which phase, the solid or the liquid, contains the greater amount of energy per particle? In which phase are the particles moving faster? Explain your answer
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86. Which electron configuration notation describes an
atom in an excited state?
A. [Ar]4s23d¹04p²
B. [Ne]3s23p5
C. [Kr]5s²4d¹
D. [Ar]4s²3d84p¹
Electron configuration notation describes an atom in an excited state as [Ar]4s²3d84p¹. Option D.
An electron is in an excited state when it temporarily occupies a higher energy state than its ground state. Electrons are excited when additional energy is supplied. When it absorbs a photon or packet of light or collides with a nearby atom or particle.
When an electron absorbs energy and shifts from a lower energy orbital to a higher energy atomic orbital the atom assumes an exciting electronic configuration. Usually an unstable electronic configuration. As a result, the electron returns to the ground state and releases a certain amount of energy. Ground state means the state with the lowest energy. When an electron absorbs energy and pops into an outer orbit, this state is called an excited state.
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5. What is the volume of 10 moles of a gas at 300 K held at a pressure of 3.5 atm?
70.33 L is the volume of 10 moles of a gas at 300 K held at a pressure of 3.5 atm.
What is volume?Volume is the percentage of a liquid, solid, or gas's three-dimensional space that it occupies.
Liters, cubic metres, gallons, millilitres, teaspoons, and ounces are some of the more popular units used to express volume, though there are many others.
We will use ideal gas law to find the volume
PV = nRT
Can also be written as
V = (nRT)/P
Where,
P = pressure
V = volume
n = amount of substance
R = ideal gas constant
T = temperature
Here, we have given
P = 3.5 atm
V = to find
n = 10 moles
R = 0.08206 L⋅atm/K⋅mol
T = 300k
Lets substitute the values
V = (10 × 0.08206 × 300)/3.5
V = 70.33 L
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How much heat does it take to raise the
temperature of 225 g of water from 25.0°C to 100.0°C?
Answer:
7.06 x 10⁴ J
Explanation:
To find the amount of heat necessary to heat the water, you need to use the following equation:
Q = mcΔT
In this equation,
-----> Q = heat (J)
-----> m = mass (g)
-----> c = specific heat capacity (J/g°C)
-----> ΔT = change in temperature
The specific heat capacity of water is 4.186 J/g°C. You can plug the given values into the equation and simplify to find "Q".
Q = ? J c = 4.186 J/g°C
m = 225 g ΔT = 100.0°C - 25.0°C = 75.0°C
Q = mcΔT <----- Given equation
Q = (225 g)(4.186 J/g°C)(75.0°C) <----- Insert values
Q = 7.06 x 10⁴ J <----- Multiply
How will you apply the concept of biology,chemistry, and homeostasis in your future career
My ability to interconnect my understanding in biology, chemistry and homeostasis makes me a great scientist as I will apply all these in my future career by:
Making sure I feed on a healthy balance diet.Separating mixtures of insoluble solids from solutions by way of filtration.Recognizing my response to certain dangerous situation when the emergency hormones are released.What is meant by an emergency hormones?These are the hormones which are released when we suddenly find ourselves in a dangerous or life threatening situation such as we need manage risk or prevent accident. This hormone is known as adrenaline. They are known as flight or fight hormones.
So therefore, the knowledge I acquired from biology, chemistry and homeostasis will used to make my career more productive in the nearest future.
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Express the answer to the following calculation with the correct number of significant figures.
-Don't put it into Scientific notation.
Type in a unit - use the symbol/abbreviation (g, not grams)
147.6mm − 0.82mm = _____ in units of ____
The value of the difference of 147.6 mm and 0.82 mm is equal to 146.78 in units of mm.
What is scientific notation?Scientific notation is a method of expressing numbers that are too large or too small to be conveniently written in decimal form. The scientific notation may be referred to as standard index form or scientific form.
This base ten notation is generally used by mathematicians, scientists, and engineers. The scientific notation of nonzero numbers can be written in the form [tex]m \times10^n[/tex] or 'm' times 10 raised to the power of n, where n is an integer.
To calculate the difference of 147.6 mm and 0.82 mm:
147.6mm − 0.82mm = 146.78 in the units of mm
As we know one millimeter is equal to 10⁻³ meters. As mentioned in the question, keep the unit 'mm' which is a millimeter.
Therefore, 147.6mm − 0.82mm = 146.78 in units of mm.
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A titration procedure between H2SO4 and LiOH required a volume of 15.50 ml of 0.1000 M LIOH solution to reach the end point. If this titration utilized 20.00 ml. of H2SO4
what is the molarity of this H2SO4 solution?
Express your answer using four sig figs
The molarity of the 20 mL H₂SO₄ solution required for the titration is 0.0388 M
How do I determine the molarity of H₂SO₄We can obtain the molarity of the H₂SO₄ solution by doing the following:
H₂SO₄ + 2LiOH —> Li₂SO₄ + 2H₂O
The mole ratio of the acid and base obtained from the equation is:
The mole ratio of the acid, H₂SO₄ (nA) = 1The mole ratio of the base, LiOH (nB) = 2From the question given, we obtained the following:
Volume of base, LiOH (Vb) = 15.50 mLMolarity of base, LiOH (Mb) = 0.1000 MVolume of acid, H₂SO₄ (Va) = 20 mLMolarity of acid, H₂SO₄ (Ma) =?MaVa / MbVb = nA / nB
(Ma × 20) / (0.1 × 15.5) = 1 / 2
(Ma × 20) / 1.55 = 1 / 2
Cross multiply
Ma × 20 × 2 = 1.55
Ma × 40 = 1.55
Divide both side by 40
Ma = 1.55 / 40
Ma = 0.0388 M
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What quantity in moles of phosphorus atoms do you have if you have 2.40 × 10²² atoms of phosphorus. (The mass of one mole of phosphorus is 30.97 g.)
Answer:
0.04 mole or 1.23 g
Explanation:
1 mole of P has 6.02 x 10^23 atoms
so quantity in moles of P of 2.40 x 10^22 atoms equal
1 mole x (2.40 x 10^22)/(6.02 x 10^23)
= 0.03986710963 or 0.04 mole
1 mole of P = 6.02 x 10^23 atoms = 30.97 g
2.40 x 10^22 atoms weights
(30.97)(2.40 x 10^22)/(6.02 x 10^23)
= 1.23468438538 or 1.23 g
If 150 grams of N2H4 and 200 grams of N2O4 are mixed what is the limiting reactant
Answer: N2O4
Explanation:
N2H4 molecular weight is 32 150g/32 = 4.7 mol
N2O4 Molecular weight is 92 200/92 = 2.2 mol
So the N2O4 has less moles present and will be the limiting reactant.
A student placed a sample of a food coloring that contains a mixture of a blue dye and a red dye at the top of a chromatography column filled with a nonpolar stationary phase. When water is poured through the column, two bands of colors are seen in the column, as shown in the diagram above.
A student collects a sample of the blue dye from the column in a cuvette. Which of the following is least useful to determine the concentration of the sample using a spectrophotometer set at 640nm?
A. The volume of a sample
B. The path length of the cuvette
C. The absorbance of the dye at 640nm
D. The solar absorptivity of the dye at 640nm
Based on the principles of spectrophotometry, the least useful to determine the concentration of the sample using a spectrophotometer set at 640nm is: the volume of a sample; option A.
What is spectrophotometry?Spectrophotometry is an analytical technique that is used to measure the concentration of a solution by measuring how much light the solution absorbs or transmits when a beam of light of a given wavelength is passed through it.
In spectrophotometry, the concentration of a solution is directly proportional to its absorptivity. This implies that the higher the concentration of a solution, the higher the amount of light absorbed by the solution.
The absorptivity of the solution is inversely proportional to the transmissivity of the solution.
The higher the concentration, the lesser the amount of light the solution will transmit.
The factors that are important in calculating the concentration of a solution are:
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a jar of crunchy butter contain 1.26 kg of peanut butter . if you use 7.7% of the peanut butter for a sandwich how many ounces of peanut butter did you take out of the container
The mass of the peanut butter that you took out of the container is 34.1 ounces
What is a conversion factor?The conversion factor is the manner in which we are able to change a value from one unit to another, Let us recall that there could be several units that could be used for a particular calculation and many times it is necessary to convert a value from one of the units to another for ease of calculation.
Mass of the crunchy butter = 1.26 kg
Percent used = 7.7%
Mass of the crunchy butter used = 7.7/100 * 1.26 kg = 0.97 Kg
To convert to ounces;
0.97 Kg * 35.247 ounces/1 Kg
= 34.1 ounces
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Balance the equation KO2(s)+CO2(g)→K2CO3(s)+O2(g)
The balanced equation is
4 KO2(s) + 2 CO2(g) = 2 K2CO3(s) + 3 O2(g).
What is the are balanced equation?The law of conservation of mass states that the mass of the reactants and products of a chemical reaction should be equal. The amount of atoms for each element doesn't really increase as a consequence of the chemical reaction. Thus, the chemical equation illustrating the chemical process must be balanced. A chemical equation is said to be balanced when the number of atoms involved on the reactants and products sides are equal.
Here are the steps we need to do in order to balance an equation:
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I need help identifying the bonds in each molecule as a polar or nonplolar
Polar molecule : [tex]NH_{3} , HF, H_{2}O, CH_{3}F.[/tex]
Non Polar Molecules : [tex]CH_{4}, BeCl_2[/tex]
What is the difference of nonpolar and Polar Molecules?We refer to something as being polar when it differs at either end. Some molecules also contain positive and negative ends; these are known as polar molecules. Polar objects can both attract and repel one another (opposite charges attract, alike charges repel).It is frequently helpful to look at Lewis structures to establish whether a molecule is polar or nonpolar. Nonpolar compounds are said to be symmetric, which means that all of the sides surrounding the core atom are the same and bound to the same element without any unshared pairs of electrons.To learn more about : Lewis structures
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Practice
5. The Republic of China presented one of the world's largest flags to the city of
Kaohsiung in 1989. The flag of the Republic of China measured 1.26 × 10^4 cm
by 8.40 x 10³ cm. What is the area of this flag in square centimeters?
The area of this flag in square centimeters is 10.58 × [tex]10^{7} cm^{2}[/tex].
What is the area of a rectangle?The quantity of unit squares that fit inside a shape determines its area. A unit square is a square having a side of one unit, as "unit" here denotes one (1). The total number of unit squares that are contained within a rectangle's perimeter is hence its area. Or, you can refer to the area of the rectangle as the region included within the rectangle's envelope. The rectangular tiles that make up your home are a fantastic illustration of form. The number of tiles on the floor makes it simple to calculate how much area it takes up. You may calculate the rectangle's area using this as well. A number of unit squares equal the area of a rectangle.
Area of flag = area of a rectangle
= l × b
= 1.26 × [tex]10^{4}[/tex] × 8.40 ×[tex]10^{3}[/tex]
= 10.58 × [tex]10^{7}[/tex] [tex]cm^{2}[/tex]
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look at the picture
The different types of neon with varied numbers of neutrons are best referred to as isotopes.
What are isotopes?In chemistry, isotopes are atoms of the same elements. These atoms have the same number of protons in their nuclei. Thus, they have the same atomic number.
However, isotopes of the same elements do not have the same number of neutrons in their nuclei. Thus, isotopes have the same number of protons but different mass numbers because of the difference in the number of neutrons.
Now consider different neon atoms with 10, 11, and 12 neutrons. These atoms are best described as isotopes of neon.
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