The value of n in the final state of the electron is 8.8 approximately 9.
To determine the final state of the electron, we can use the equation for the energy levels of hydrogen:
[tex]En = -13.6\ eV/n^2[/tex]
Since the electron is initially in the n=3 state, we can substitute n=3 into the above equation to find the initial energy level.
[tex]E3 = -13.6\ eV/3^2 = -1.51 eV[/tex]
The total energy of the electron in the final state will be:
[tex]Ef = E3 + 1.23 eV = -1.51 eV + 1.23 eV = -0.28 eV[/tex]
To determine the final value of n, we can rearrange the equation for the energy levels of hydrogen and solve for n:
[tex]n = \sqrt{(-13.6 eV/Ef)[/tex]
Substituting the value of Ef, we get:
[tex]n = \sqrt{(-13.6 eV/(-0.28 eV)) }[/tex] ≈ 8.8
Therefore, the value of n in the final state of the electron is approximately 9.
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What is the electron configuration of Cd4+?
Is it [Kr] 4f145d8 ?
The electronic configuration of Cd4+ is [Kr] 4d7 5s1.
Electronic configuration also termed as electronic structure as well as electron configuration. It is the arrangement of the electrons in orbitals around an atomic nucleus.
Cadmium is a transition metal which is poisonous in nature. It is denoted by the symbol "cd". Cadmium is located in the d-block elements and the 12 group of the modern periodic table which is possessing an atomic number of 48 and its atomic mass will be 112.411g. The color of the cadmium is silvery grey metallic and the density will be 8.6g/cm3. It commonly used as a sacrificial anode to protect steel and iron from corroding and it is also used in nickel-cadmium batteries.
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Which is a distinction between an epidemic and a pandemic?
A.
the species of organisms infected
B.
the geographical area affected
C.
the symptoms of the disease
D.
the season in which the disease spreads
Answer:
B.
a pandemic would be like COVID-19 as it spread world wide
a epidemic would be like Japanese small pox incident because it was mostly in Japan
Why has the atom model changed over time?
The atomic model changes over time because the atomic model was based on theories and discoveries.
Because the atomic model was built on theories and observations, it evolves with time. The atomic model was altered as a result of our false assumptions about the atomic form being shown through experiments to be made up of even smaller particles.
Bohr's and Rutherford's models of the atom were the two main ones. The model evolved over time when electrons, protons, neutrons, orbitals, etc. were discovered.
To explain how electrons might form stable circles around the centre of a molecule, Bohr introduced his quantized shell model of the molecule in 1913. Radiation can occur simply when an electron jumps from one circle to the next.
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(05.02 LC)
Which formula can be used to calculate the molar mass of water (H2O)?
a
2 × molar mass of H + 2 × molar mass of O
b
molar mass of H + 2 × molar mass of O
c
2 × molar mass of H + molar mass of O
d
molar mass of H + molar mass of O
The formula that can be used to calculate the molar mass of water would be molar mass of H + 2 x molar mass of O. Option B.
Molar mass calculationThe molar mass of a compound is simply the sum of the molar weight of the individual atoms that make up the chemical formula of the compound. It can also be defined as the ratio of the mass of a substance and its amount, in moles.
Using the first definition, the molar mass of water whose chemical formula is [tex]H_2O[/tex] can be calculated using the following formula:
Molar mass of [tex]H_2O[/tex] = molar mass of H + molar mass of O + molar mass of O
In other words:
Molar mass of [tex]H_2O[/tex] = molar mass of H + 2 x molar mass of O
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Movies | Aldah - Watch Free Movie.. GoStream 123m Watch Angeles In the laboratory a "coffee cup calorimeter or constant pressure calorimeter, is frequently used to determine the specific heat of a solid, or to measure the energy of a solution phase reaction Since the cup itself can absorb energy, a separate experiment is needed to determine the heat capacity of the calorimeter. This is known as calibrating the calorimeter and the value determined is called the calorimeter constant One way to do this is to use a common metal of known heat capacity. In the laboratory a student heats 95,37 grams of copper to 99.24 °C and then drops it into a cup containing 78.54 grams of water at 22.14 °C She measures the final temperature to be 29.85 °C Using the accepted value for the specific heat of copper (See the References tool), calculate the calorimeter constant Calorimeter Constant = 1°C NEC DOLL Priser sert
A student heats 95.37 grams of copper to 99.24 °C and then drops it into a cup containing 78.54 grams of water at 22.14 °C She measures the final temperature to be 29.85 °C . The calorimeter constant is 1°C.
Given that :
Mass of copper = 95.37 g
Heat capacity = 0.44 J/ g °C
Temperature = 99.24 °C
Final temperature = 29.85 °C
Q copper = m c × ΔT
= 95.37 × 0.44 × -69.39
= - 2773.8 J
Mass of water = 78.54 g
Heat capacity = 4.18 J/g °C
Q = 78.54 × 4.18 × 7.71
Q = 2787.6J
Q calorimeter = 13.8 J
Calorimeter constant = 13.8 J / 7.71 °C
= 1 °C
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Determine the number of grams in the quantity below.
0.5 moles of H₂SO4
The number of grams, multiply 0.5 moles by the molar mass of H₂SO4: 49.04 g.
What is molar mass?Molar mass is the mass of a given substance (chemical element or compound) divided by the amount of substance in moles. It is usually expressed in grams per mole (g/mol). Molar mass is an important concept in chemistry, as it is used to calculate the mass of a substance from the amount of moles of the substance. It is also used to calculate the amount of moles of a substance from the mass of the substance. Molar mass is also used to calculate the density of a substance, as well as the molar volume of a substance.
The number of grams in 0.5 moles of H₂SO4 can be calculated using the molar mass of H₂SO4, which is 98.08 g/mol. To calculate the number of grams, multiply 0.5 moles by the molar mass of H₂SO4:
0.5 moles x 98.08 g/mol = 49.04 g
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How does temperature affect physical and chemical changes please make it short!
Answer: Increasing or decreasing the temperature will cause chemical changes to occur faster or slower. Physical changes turn solids into liquids and liquids into gases when you increase the temperature. Decreasing the temperature turns gases into liquids and liquids into solids. Hope this helps!
The atomic mass unit is equivalent to 112 of the mass of a neutral atom of which element?
Answer: carbon element
Explanation:
this is it
what cup can keep the heat/cold in the longest?
Answer:
Stanley Classic Trigger Action travel Mug
Explanation:
The Stanley Classic Trigger Action travel mug offers heat retention for an impressive seven hours. It also keeps cold beverages chilled for 10 hours, and iced beverages icy for a whopping 30 hours.
Extra:
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Given 0.32 moles of H2O how many moles of H2 are needed
Answer:
0.32 moles of H2
Explanation:
I will assume the question concerns the production of water from hydrogen and oxygen(?). If theis is correct, start with a balanced chemical reaction.
O2 + 2H2 = 2H2O
2 O and 4 H on both sides of the reaction: it is balanced.
The balanced equation tells us we need 2 moles of H2 for every 2 moles of H2O, a 1:1 molar ratio. If we want 4 moles of H2O, we'd need 4 moles of H2.
If we want 0.32 moles of H2O, we need 0.32 moles of H2.
Which statements always apply to the process of diffusion? Check all that apply
Answer:
- Molecules move from high concentrations to low concentrations.
- Molecules are evenly distributed at the end.
Explanation:
:)
What is DNA replication Mcq?
DNA replication is a process by which this protein is duplicated, that is, an identical copy is synthesized. Thus, from a single molecule of this complex compound, two or more replicas will be derived.
Why is DNA replication an important process?DNA is the basis of genetic material. Through this protein, information is passed from parents to children, which allows genetic sequencing.
It is precisely the replication of this complex protein that allows genetic information to be transmitted from a mother cell to daughter cells.
In DNA replication, the two complementary polymers of the original DNA, when separated, serve as a template for the synthesis of a new strand complementary to the original template strand.
Manufacture of proteins during the process of DNA replication.DNA replication begins in the individual when its first cells are formed in the embryonic stage and ends when the organism dies is what allows it to occur in the individual's genetic evolution, although genetic alterations can also occur on occasions due to unknown causes.
Through this process of transcription and translation that takes place in the cell, all the proteins that the organism needs for its functioning are made, which depends on the information stored in the DNA base sequences.
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Under what conditions is the ideal gas assumption suitable for real gases select all that apply?
The ideal gas law is a powerful tool for predicting the behavior of gases under a variety of conditions.
According to the ideal gas law, gases will behave most like an ideal gas when they are at low pressures and high temperatures.
This means that when the pressure is low and the temperature is high, the molecules of the gas will have more space to move around and they will have higher average speeds.
Under these ideal conditions, the gas will behave according to the predictions of the ideal gas law.
Additionally, the gas particles must be small and non-interacting, meaning that they do not interact with each other. When these factors are taken into account, a gas will most likely display the ideal gas properties predicted by the ideal gas law.
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Show work worth
Show work 10 points
Particle of Cu that Johnny produce is 2.7521 x 10²³ particles
A substance's mole is equivalent to 6.022 × 10²³ of that material (such as atoms, molecules, or ions). The term "Avogadro's number" or "Avogadro's constant" refers to the number 6.022 × 10²³.
To calculate the number of particles, first we Should calculate the moles of Cu
Moles of Cu = mass / mass molar
Moles of Cu = 29.02 g / 63.5 g/mole
Moles of Cu = 0.457 moles
The we can calculate the particle Cu that johnny produce
Particle Cu = moles x avogadro's number
Particles Cu = 0.457 moles x 6.022 x 10²³
Particles of Cu = 2.7521 x 10²³ particles
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how many orbitals are in the 3rd principal energy level
The number of orbital in the third principal energy level nine.
What is principal energy level?
Principal energy level is a space that divide nucleus atom into a region with a certain levels. each of them has one sub level that contain only one s- orbital. In the s- orbital, the total electron available is 2 and determine as the lowest level because it is contain the lowest electrons. Each principal energy level after first energy level has one s- orbital with 3 p-orbital. Hence the third principal energy level contain 1 s- orbital, 3 p-orbital and 5 d-orbital or 1 + 3 + 5 total orbital. So, the total orbital of this level is 9.
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Mg(OH)2 + 2HCI --> MgCl2 + 2H₂O
How many moles of water form from one gram of magnesium hydroxide?
Mg3N2:Mg(OH)2:Mg(O H)2 has a mole ratio of 1:3 (Mg3N2:Mg3N2:Mg(OH)2:Mg(O H)2). Following are the moles of Mg(OH)2 Mg(O H)2 that can be generated from 0.21401 moles of Mg3N2 Mg3 N2.
How many moles of magnesium hydroxide are present?Magnesium hydroxide weighs 12.5 g. One mole of magnesium hydroxide is equivalent to the molar mass, which should be 58.3 grammes. Therefore, we need to figure out how many moles there are. Hydroxide of magnesium, 214 moles.The molar mass of an element's atoms is determined by multiplying its standard relative atomic mass by the molar mass constant, 1 103 kg/mol = 1 g/mol.Consequently, the mass of a mole of magnesium atoms is given by NA x 24.305 amu x (1.66054x10-24 g/amu) = 24.305 g. The mass of a mole of magnesium atoms is 24.305 g.Molecular weight expressed in grammes a substance's molecular weight in grammes, expressed as mass.To learn more about moles refer to:
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Determine the correct answers to the problems below and round to the required number of significant figures.
Enter your answer in standard notation.
0.004911/3.87 =
4 x 6 =
When rounding to a significant figure, look at the first non-zero digit if doing so to one. If rounding to two significant figures, look at the digit following the first non-zero digit.
Between any two non-zero digits, all zeros are important. Seven significant digits are seen in, for instance, 108.0097. There is never any significance for any zeros that are both to the right and left of the decimal point and a digit that is not zero. As an illustration, 0.00798 has three significant digits. The zeros in between two non-zero digits ARE important. Leading zeros have no relevance. The trailing zeros to the right of the decimal point ARE important. A full number's trailing zeros when represented by a decimal are important.
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(A)should have three significant figures, as the lowest number of significant figures is always correct. 0.004911/3.87 = 0.001268 = 0.00127 = 1.27(10)-3. (B) 4*6 has two significant numbers of 1, and 24 rounds to 20 to equal 2(10)1.
The significant figures of a number are the important or critical digits that correctly convey the meaning of that number. For instance, the number 6.658 has four significant digits. The statistics' precision comes from these enormous sums. They are sometimes referred to as significant digits. Significant figures, also known as the significant digits, accuracy, or resolution, are the digits in a number that are reliable and necessary to indicate the quantity of anything in positional notation. If a number indicating the result of a measurement has more digits than the number of digits permitted by the measurement resolution, only the digits allowed by the measurement resolution are reliable, and only these can thus be relevant figures.
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Which process requires the release of energy
Vaporization
Melting
Sublimation
Deposition
Answer:
Vaporization and Sublimation require the release of energy.
Explanation:
Vaporization is the process of converting a liquid into a gas. It requires energy to break the intermolecular forces between the liquid molecules, so it releases heat energy.
Sublimation is the process of converting a solid directly into a gas, skipping the liquid phase. It also requires energy to break the intermolecular forces between the solid molecules and release the solid particles into the air, so it releases heat energy as well.
Melting and Deposition, on the other hand, are processes that occur with the absorption of energy.
Melting is the process of converting a solid into a liquid. It requires energy to overcome the intermolecular forces between the solid particles and create a liquid, so it absorbs heat energy.
Deposition is the process of converting a gas into a solid, it also requires energy to overcome the intermolecular forces between the gas particles and create a solid, so it absorbs heat energy as well.
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Answer: Deposition
Explanation: right for acellus.
Predict the products of the following reactants: Cu + AlCl3 -->
A. 3Cu + 2AlCl3 --> 3CuCl2 + 2Al
B. Cu + AlCl3 --> CO2 + H2O
C. Cu + AlCl3 --> AlCuCl3
D. No reaction will occur
Option A. 3Cu + 2AlCl3 --> 3CuCl2 + 2Al is correct.
The products of the reactants Cu + AlCl3 are 3CuCl2 and 2Al. This is a single replacement reaction, in which the copper metal is replaced by the aluminum ions in the aluminum chloride compound, forming copper chloride and aluminum metal.
What are reactants?In a chemical reaction, reactants are substances or elements that interact with or combine with another substance or element (the process of transformation of chemical substances). Typically, these are at the start of the arrows in chemical processes. To further grasp the word, let's look at an example of a chemical equation (a symbol for a chemical reaction).
Water is created when hydrogen and oxygen are combined.
The chemical makeup of water is shown in the aforementioned reaction. A chemical reaction's arrow denotes the direction in which the reaction takes place. This is how the equation would seem if we used the scientific names for its components.
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A compound with a formula ma of 42. 06 u i found to be 85. 64% carbon and 14. 36% hydrogen by ma. Find it molecular formula
The molecular formula of the compound is C1H2.
The molecular formula of a compound can be determined by analyzing its percent composition by mass. The first step is to convert the percent composition by mass to the mass of each element in one mole of the compound.
85.64% C = (85.64 g C/100 g compound) * (1 mole C/12.01 g C) = 7.13 moles C/mole compound
14.36% H = (14.36 g H/100 g compound) * (1 mole H/1.008 g H) = 14.22 moles H/mole compound
The next step is to find the ratio of atoms in the compound by dividing the moles of each element by the smallest moles of any element.
C:H = 7.13 moles C/mole compound : 14.22 moles H/mole compound = 7.13:14.22
To find the molecular formula, we need to divide the moles of each element by the lowest ratio of atoms to obtain the least whole number ratio of atoms in the compound.
C:H = 7.13 moles C/mole compound / 7.13 : 14.22 moles H/mole compound / 7.13 = 1 : 2
Therefore the molecular formula of the compound is C1H2
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draw the structure of cyclopropane
The structure of Cyclopropane has three methylene groups (CH2) that are linked together to form a ring or cyclic structure.
Cyclopropane is a cyclic hydrocarbon that has only single bonds. These hydrocarbons have properties similar to open-chain compounds and behave like noncyclic alkanes. Cyclopropane is an exception because it has a highly strained ring, as the C-C-C forms a 60° angle and the preferred bond angle is 109.5°.
The molecular formula of cyclopropane is (CH2)3. 1-methyl ethyl is its chemical name. It functions as an inhalation anaesthetic. It was first studied because it was thought to be the toxic element in ethylene.
The skeletal structure of cyclopropane is shown below.
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Which of the following prevent watershed pollution?
options:
A: cutting down trees
B: flushing the toilet
C: picking up litter and pet waste
D: using a broom instead of a hose to clean sidewalks
Choose all that apply
Everyday, save water. Reduce the length of your showers, patch any leaks, and switch off the flow when you're not using it. Instead of disposing of hazardous household chemicals into the drain, transport them to the a hazardous waste facility. Use resilient plants in your yard that require little to no watering, fertilizer, or pesticides.
What three categories do pesticides fall under?Arthropods, including insects, are killed by insecticides. Mites can feed on both plants and animals are eliminated with miticides, also known as acaricides. Microorganisms known as microbial pesticides can kill, prevent, or outcompete pests like insects or even other microorganism pests.
Do pesticides harm people?Pesticides can have both acute, or short-term, negative health impacts, and chronic, or long-term, consequences, which can develop years or months after exposure. Examples of immediate health consequences include eye stinging, blisters, rashes, blindness, nausea, lightheadedness, diarrhea, and even death.
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Answer: The answer is : using a broom, and picking up litter and pet waste.
Explanation: I just took the test and got a 100%,! that was my answer.
Use the activity series to predict whether
the following reactions are possible. Explain
your answers.
a. Ni(s) + MgSO4(aq) →→→→ NiSO4(aq) + Mg(s)
b. 3Mg(s) + Al₂(SO4)3(aq) →→→→ 3MgSO4(aq) + 2Al(s)
c. Pb(s) + 2H₂O(1)→→→→→ Pb(OH)₂(aq) + H₂(g)
(a) Ni(s) + MgSO4(aq) →→→→ NiSO4(aq) + Mg(s) = Not Possible
(b) 3Mg(s) + Al₂(SO4)3(aq) →→→→ 3MgSO4(aq) + 2Al(s) = Possible
(c) Pb(s) + 2H₂O(1)→→→→→ Pb(OH)₂(aq) + H₂(g) = Possible
What is the reason for above ?(a) If you look at the table, nickel is way below magnesium and therefore less reactive. As a result, it will not be able to steal SO4 from magnesium because it is not reactive enough, proving that answer A is incorrect.
(b) Magnesium is more reactive than aluminium, and since it is located directly above the latter, it is feasible.
(c) Lead, which is more reactive than hydrogen, can also be C because Pb.
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beryllium and iodine
Express your answer as a chemical formula.
Answer: Aberham Lincon was an basketball player for the brick walls and then got traded to the wasthiton bottle caps then I will go to the bus stop
Explanation:
Coversion of 2-methyl-2-butanol to 2-chloro-2-methylbutane, with a curved arrow mechanism (this will have HCl as the reagent & I believe an SN1 reaction?)
Conversion of 2-chloro-2-methylbutane to 2-methyl-2-butene and 2-methyl-1-butene, with a curved arrow mecahnism (E2 reaction, I think with alcoholic potassium hydroxide)
Reaction of 2-methyl-2-butene and 2-methyl-1-butene with Br2 in CH2Cl2
In light of this, 2-methyl-2-butene is more stable than 2-methyl-1-butene. The relative stability of the product turns proven to be the crucial element in determining the primary product when a small size base is utilized for the elimination reaction, such as OH-, CH3O-, or EtO-.
This is due to the fact that major product is more frequently supplanted than minor product, making them more stable. In contrast to 2-Methyl-1-butene, we, therefore, created more 2-Methyl-2-butene. Zaitsev's rule is an empirical formula used to foretell the main byproducts of elimination reactions. The more stable alkene with the more strongly substituted double bond is the main product in an elimination process, according to this statement.
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Quincy uses the quadratic formula to solve for the values of x in a quadratic equation. He finds the solution, in simplest radical form, to be x = startfraction negative 3 plus or minus startroot negative 19 endroot over 2 endfraction. Which best describes how many real number solutions the equation has?.
x = [-b (b2 - 4ac)]/2a is the solution to the quadratic equation ax2 + bx + c = 0. By using the plus and minus symbols in this formula, we are able to determine the two values of x. In light of this, there are two plausible values for x: [-b + (b2 - 4ac)]/2a and [-b - (b2 - 4ac)]/2a.
Which equation has all real numbers as solutions?The simplest definition of a real solution in algebra is a solution to an equation that is a real number.
ax2 + bx + c = 0 is the quadratic equation's conventional form.
Since the discriminant is negative, the equation has zero real number solutions in its simplest radical form.
A linear equation is an identity if it can be solved by finding the solution to a true assertion, such as 0 = 0. All real numbers make up its solution set.
On both sides of the equation, combine like terms. Subtract x from both sides to isolate the x word. You reach the correct result, "3 Equals 3." It indicates that the equation's answer when you arrive at a true statement like this.
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How would you make it a supersaturated solution of sodium acetate in water?
175 g of sodium acetate trihydrate and 50 mL of distilled water (3.5 g NaC2H3O2. 3H2O per mL H2O) are combined to create the supersaturated solution. The mixture is then heated in a water bath while being occasionally stirred to create a clear, uniform solution.
How to prepare a supersaturated solution?To make a supersaturated solution of sodium acetate in water, you would need to dissolve more sodium acetate in the water than would normally be possible at a given temperature. This can be achieved by heating the water to a temperature at which more sodium acetate can be dissolved, and then slowly adding the sodium acetate while stirring until no more will dissolve. Once the desired concentration of sodium acetate is reached, the solution should be cooled to room temperature or below, which will cause the excess sodium acetate to come out of solution and form crystals.
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Consider the given plot of absorbance vs. concentration. Which line is the best-fit line to represent the black data points? Absorbance А B 1 0.9 0.8 С 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0.1 0.5 0.6 0.2 0.3 0.4 Concentration Select one: Blue line (C) O Green line (A
For the given plot of absorbance vs Concentration, the purple line is the best-suited line to characterize the black statistics points.
What is Concentration?In chemistry, concentration refers to the amount of a substance in a defined space. Another definition is that concentration is the ratio of solute in a solution to either solvent or total solution. Concentration is usually expressed in terms of mass per unit volume. However, the solute concentration may also be expressed in moles or units of volume. Instead of volume, concentration may be per unit mass. While usually applied to chemical solutions, concentration may be calculated for any mixture.Two related terms are concentrated and dilute. Concentrated refers to chemical solutions that have high concentrations of a large amount of solute in the solution. If a solution is concentrated to the point where no more solute will dissolve in the solvent, it is said to be saturated. Dilute solutions contain a small amount of solute compared with the amount of solvent.In order to concentrate a solution, either more solute particles must be added or some solvent must be removed. If the solvent is nonvolatile, a solution may be concentrated by evaporating or boiling off solvent.
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Zn-66(atomic number 30) has
Zinc-66 with atomic number 30 has 30 protons, 36 neutrons and 30 electrons.
What is atomic number?The atomic number of an element is the number of protons in an atom of that element.
The atom of an element is made up of three subatomic particles namely; protons, neutrons and electrons.
Proton is the positively charged subatomic particle forming part of the nucleus of an atom and determining the atomic number of an element while electron is the subatomic particle having a negative charge and orbiting the nucleus.
Neutron, on the other hand, is the subatomic particle forming part of the nucleus of an atom and having no charge. It is got by subtracting the number of protons of an atom from the mass number.
According to this question, an atom of Zinc element is said to have a mass number of 66 and atomic number 30. This suggests that the zinc atom posseses the respective number of subatomic particles as illustrated in the main answer part.
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Determine the correct sequence of trials. First Add HCl to water and measure pH Add HCl to buffers and measure pH Add NaOH to water and measure pH Make assigned buffer(s) Add NaOH to buffers and measure pH
In order for the unknown's absorbance to fall within the standard curve, dilute it. If the dilution procedure is documented, it is possible to calculate the full strength concentration after determining the diluted quantity.
The solution's strength is what.The solute content in grams dissolved per liter of the solution is used to determine the solution's strength. It serves as a gauge of the solution's potency or concentration. The unit of measurement is grams per liter.
Is focused the same as powerful?Strong acids are those that totally dissociate in an aqueous solution, while concentrated acids are those that have a high concentration of acid molecules per unit of mixture.
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