Answer:
Hey! I`m In K12. Currently in 7th, going into 8th next year. I have Mrs. Keefe and one of my teachers, what about y`all?
Which of the following can result in deviations from Beer\'s law when the path length is constant? Solute concentrations less than 0.01 M Stray light reaching the detector The absorbing species undergoes dissociation or association The sample is homogeneous The use of polychromatic radiation
The option that can lead to deviations from Beer's law at constant path length is option A.
Using monochromatic radiation All radiation that was not absorbed by his sample when stray light reaches the detector is transmitted to the detector.
All of the above factors can lead to deviations from Beer's Law if the path length is constant. Optical pathlength refers to the distance that light travels through a sample and is usually kept constant in spectrophotometric experiments in order to accurately measure the sample's absorbance.
Therefore, unless monochromatic radiation is used, the absorbance of the sample may not accurately reflect the concentration of the solute, as different wavelengths of light may be absorbed differently.
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Glass is typically produced by mixing sand (quartz or silica, SiO_2) with other compounds or minerals, which are then crushed, melted, and then cooled (vitrification). Given the compositions and properties of the different types of glass in the table above, consider the role each compound plays in the type of glass formed, and then complete the statements below. Match the compounds in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer. Adding to the mixture that undergoes vitrification produces a glass with brilliant optical properties. Adding to the mixture that undergoes vitrification produces a glass that can be used for baking purposes or storing chemical solutions. Adding to the mixture that undergoes vitrification produces a glass that is insoluble in water. Adding to the mixture that undergoes vitrification allows the glass to be produced at much lower temperatures.
Addition of soda (Na₂CO₃) to the vitrifying mixture produces glasses with excellent optical properties.
Give a brief account on silica?Silica is the common name for the compound silicon dioxide, which consists of one silicon atom and two oxygen atoms. It is an important component of many rocks, sands, and clays, and is also found in many plants and animals. Silica is used in a wide variety of products, from beer and wine to pottery, glass, and paint. It is also used in building materials such as concrete and mortar, and as a food additive. Silica is also used to make silicon-based electronics such as computer chips.
Adding lime (CaCO₃) to the vitrifying mixture creates a jar that can be used to bake or store the liquid medicine.
Addition of alumina (Al₂O₃) to a mixture undergoing vitrification produces a glass that is insoluble in water.
Addition of borax (Na₂B₄O₇) to the mixture during vitrification allows glass to be produced at much lower temperatures.
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Which of the following ions has the largest radius?
a. Na+
b. K+
c. CS+
d. Li+
The size of an ion is determined by its atomic radius, which is a measure of the size of the atom from which the ion is formed. The atomic radius of an atom is generally determined by the size of its electron cloud. The size of the electron cloud is influenced by the number of electrons and the energy levels they occupy.
Of the ions given, Li+ has the smallest atomic radius because it has the smallest number of electrons and the highest effective nuclear charge, which means that its electrons are held more closely to the nucleus. Na+, K+, and CS+ have larger atomic radii than Li+ because they have more electrons and lower effective nuclear charges, which means that their electrons are held more weakly by the nucleus.
Therefore, the answer is CS+ has the largest radius.
Identify one advantage to each of the following models of electron configuration: Dot structures Arrow and line diagrams Written electron configurations Type in your answer below.
Simple Lewis dot structures make it easy to see how many valence electrons are present in an atom. Valence electrons are shown as dots surrounding the atom that are organized in pairs in Lewis dot formations.
Electron spin direction is displayed using arrow and line diagrams, along with each orbital. The electron configuration of atoms is shown using arrow and line diagrams or orbital diagrams, which use boxes and arrows to indicate the different orbitals and the pairing arrangement of electrons. This model has the benefit of displaying each orbital as well as the electrons' spin polarity.
Written electron configurations are concise and also depict how the electrons are distributed throughout the sublevels. The number of electrons in a specific sublevel is indicated by superscripts in written electron configuration notation. Written electronic configuration has the advantage of being more compact due to the removal of boxes and arrows. It also displays how electrons are distributed among sublevels.
The arrangement of electrons within an atom's orbitals, shells, and subshells is known as electron configuration.
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Answer:
Dot structures make it easy to count electrons and they show the number of electrons in each electron shell.
Arrow and line diagrams show the spin of electrons and show every orbital.
Written configurations require minimal space and show the distribution of electrons between subshells.
Explanation:
correct on edg 2023
What is the concentration if I have 200 mL of water and dissolve 13g of salt in it? Show your work!
Answer:
The concentration is 0.065g/mL
Explanation:
Given
[tex]m = 13g[/tex] --- mass of salt
[tex]V =200mL[/tex] --- volume of water
Required
Determine the concentration (C)
This is calculated as:
[tex]C = \frac{m}{V}[/tex]
[tex]C = \frac{13g}{200mL}[/tex]
[tex]C = \frac{13}{200}g/mL[/tex]
[tex]C = 0.065g/mL[/tex]
The concentration is 0.065g/mL
According to the data, the temperature of the
substance is 28°C. If we know that 0°C = 273 K,
what is the temperature of the substance in
Kelvin?
Answer: 351
Explanation: From °C to kelvin we do
K=273+°C
From Kelvin to °C we do
°C=K-273 or -273+ K
A 46 g piece of metal at 250C is placed in a calorimeter with 500. mL of water at 20C. If the final temperature was 24C, the specific heat of the metal is what?
What is the main function of meter?
The main function of the meter rule is to measure the distance between the two points , it is use to measure the length.
The first unit of the length is the meter. the length is defined as the distance between the two points. the meter is used to measure the length in the international system of the units. the instrument used to measure the meter is the meter rule or the meter stick. the mete rule is also called as the ruler. before the meter rule of discovery we use the primitive methods to measure the distance.
Thus, the function of the meter is the to measure the distance between the two points.
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Fe(OH)3
⎯⎯→
Fe2O3
⎯⎯→
Fe
⎯⎯→
FeCl2
⎯⎯→
Fe(OH)2
Answer:
decomposition reaction
What observation is made when magnesium powder and lead(ii) are heated together
Answer:
in the lead strip the will be no change and no reaction. this is job salvation that is made when magnesium powder and lead to our heater together
PLEASE HELP
How many moles of silane gas (SiH4) are present in 8.68 mL
measured at 18 0C and 1.50 atm?
Answer: There are 0.00054 moles of silane gas (SiH4) are present in 8.68 mL measured at 18 0C and 1.50 atm.
Explanation:
Given: Volume = 8.68 mL (1 mL = 0.001 L) = [tex]8.68 \times 10^{-3} L[/tex],
Temperature = [tex]18^{o}C = (18 + 273) K = 291 K[/tex],
Pressure = 1.50 atm
The ideal gas formula is as follows.
PV = nRT
where,
P = pressure
V = volume
n = no. of moles
R = gas constant = 0.0821 L atm/mol K
T = temperature
Substitute the values into above formula as follows.
[tex]PV = nRT\\1.50 atm \times 8.68 \times 10^{-3} L = n \times 0.0821 L atm/mol K \times 291 K\\n = \frac{1.50 atm \times 8.68 \times 10^{-3} L}{0.0821 L atm/mol K \times 291 K}\\= \frac{0.01302}{23.8911}\\= 0.00054 mol[/tex]
Thus, we can conclude that there are 0.00054 moles of silane gas (SiH4) are present in 8.68 mL measured at 18 0C and 1.50 atm.
Why do you think the author chose to organize the information this way
How can you tell by looking at the graph if a substance is solid, liquid, or gas at room temperature?
What is the mass in grams of 1.56 moles of aspartame?
459.1 g of aspartame has a 1.56 moles of aspartame.
Artificial sweetener aspartame is potent and low in calories. About 200 times sweeter than sugar, it is a white, odourless powder. It is legal to use in Europe as a tabletop sweetener, an energy-reducing food ingredient in beverages, desserts, and sweets, dairy products, chewing gum, and other foods.
Aspartame is a dipeptide that is created through the formal condensation of the amino group of methyl L-phenylalaninate with the alpha-carboxy group of L-aspartic acid.
Here, aspartame has 1.56 moles.
Molar mass of aspartame = 294.40 g/mol
So, Number of moles of aspartame = [tex]\frac{Given Mass}{Molar Mass}[/tex]
Mass of aspartame = Number of moles × Molar mass
or, mass = 1.56 × 294.3
or, mass = 459.1 g
Hence, Mass of aspartame of 1.56 moles of aspartame is 459.1 g.
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how many sublevels are in Silicon
There is 5 orbitals!
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How many ATP are directly generated in the Krebs cycle when 2 molecules of glucose are oxidized?
4 ATP molecules are directly generated in the Krebs cycle when 2 molecules of glucose are oxidized
How Krebs cycle move to produce glucose molecule?The Krebs cycle, TCA cycle or the citric acid cycle, is a series of enzyme-catalyzed reactions occurring in the mitochondrial matrix and involves the oxidation of acetyl-CoA.
The acetyl group of acetyl-CoA is oxidized to make two molecules of CO2 in a succession of eight steps, while also producing one ATP. Additionally, reduced high-energy molecules like NADH and FADH2 are created.
Each glucose molecule produces two acetyl-CoA molecules, the Krebs cycle must move twice for one glucose molecule to produce the four CO2, six NADH, two FADH2, and two ATPs.
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If there are 6 atoms of hydrogen on the products side, how many molecules of H2 are on the reactants side?
If there are 6 atoms of hydrogen on the products side, then there would be 6 atoms of hydrogen also on the reactants side. That would be 3 molecules of [tex]H_2[/tex].
Law of conservation of atomsAccording to the law of conservation of atoms or matter, atoms can neither be destroyed nor created during the course of chemical reactions. However, atoms can change forms during reactions.
Going by this law, it means the number of atoms of a particular element must remain constant before and after chemical reactions. Otherwise, we will say the chemical equation of such reactions are not balanced.
Thus, if there are 6 atoms of hydrogen on the products side of a reaction, 6 atoms of hydrogen must also be on the reactants side of the reaction. A molecule of hydrogen, [tex]H_2[/tex], has 2 atoms of hydrogen. This means 3 molecules of hydrogen must be on the reactants side in order to have a total of 6 hydrogen atoms.
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How many moles in 28 grams of UO22- ?
The amount, in moles in 28 grams of [tex]UO_2[/tex] would be 0.1037 mol.
Moles determinationThe mole of a substance is the ratio of the mass of the substance and the molar mass of the substance. This can be mathematically expressed as:
Mole = mass/molar mass
Molar mass of [tex]UO_2[/tex] = 238 + (16x2) = 270 g/mol
Thus, the number of moles in 28 grams of [tex]UO_2[/tex] would be:
Mole = 28/270 = 0.1037 mol
In other words, the number of moles in 28 grams of [tex]UO_2[/tex] would be 0.1037 mol.
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How many moles in 28 grams of UO2?
In the 1930s a telephone-company engineer named Karl Jansky was trying to track down
Answer:
In the 1930s a telephone-company engineer named Karl Jansky was trying to track down the cause of hissing static in phone lines when he discovered something strange. Radio energy from outer space was interfering with the phone signals. After learning about Janksy's discovery, a radio engineer named Grote Reber decided to investigate.
Explanation:
When 45. 8 g of alanine (C3H7NO2) are dissolved in 1200g of a certain mystery liquid X, the freezing point of the solution is 4. 10 ℃ less than the freezing point of pure X. Calculate the mass of sodium chloride that must be dissolved in the same mass of X to produce the same depression in freezing point. The van't Hoff factor i=1. 82 for sodium chloride in X. Be sure your answer has a unit symbol, if necessary, and is rounded to the correct number of significant digits
16.5 g is the mass of sodium chloride that must be dissolved in the same mass of X to produce the same depression at freezing point.
What are a molar mass and a mole?Avogadro's number (6.022 x 1023) of molecules (or formula units) make up one mole of a substance (ionic compound). The mass of 1 mole of a chemical is indicated by its molar mass. It provides you with the number of grams per mole of a substance, to put it another way.
ΔT = Kc*W*i
Kc = cryoscopy constant of the solute X
W = molality of the solution
i = van't Hoff factor, For organic molecules, such as alanine, i = 1.
n = 45.8/89.09
n = 0.5141 mol
W = 0.5141/1.2 = 0.4284 mol/kg
So, Kc of X is:
4.10 = Kc*0.4284*1
Kc = 9.57 °C.kg/mol
So, if now sodium chloride is added to X, and the temperature change is the same, and i = 1.82:
4.10 = 9.57*W*1.82
W = 0.2354 mol/kg
The number of moles of the solute is then:
W = n/1.2
0.2354 = n/1.2
n = 0.2825 mol
The molar mass of sodium chloride is 58.44 g/mol, thus the mass is the molar mass multiplied by the number of moles:
m = 58.44*0.2825
m = 16.5 g
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The faster the object is moving the more portential energy it has?
Answer:
sure
Explanation:
Students are challenged to design cold packs for treating injuries. To do this they must find a chemical reaction that absorbs heat energy. The ideal chemical reaction will reach a temperature in the range of 0C to 4C and maintain that temperature for a minimum of 20 minutes
Students as a chemical reaction that absorbs thermal energy for the design of cold packs for the treatment of injuries can combine manganese oxide (MnO2) with hydrogen peroxide (H2O2)
By controlling the amounts of the reactants they can control the temperature, keeping it between 0 °C and 4 °C for 20 minutes or more.
This type of chemical reaction is called endothermic, because energy is absorbed in the form of light or heat, causing the resulting products to have higher energy than the reactants.
Chemical reaction that absorbs thermal energy fpr cold compresses for the treatment of injuriesThe most widely used endothermic chemical reaction in the treatment of injuries is the melting of ice, at least in warm environments, which occurs according to the following reaction:
H2O (s) + Energy ----- H2O (l)
Decomposition of manganese oxide absorbs thermal energyThe effect of an endothermic reaction is absorbs heat energy and in the case of manganese oxide the following decomposition occurs:
MnO2 (s) → MnO (s) + ½ O2 (g); ∆HR = 134kJ
Students can design cold packs for treating injuries with manganese dioxide bcause it breaks down into two products, manganese oxide and oxygen, making the enthalpy greater than zero (∆HR > 0).
MnO2 is a solid between gray and black in color and is present in minerals such as pyrolusite and nsutite, when combined with hydrogen peroxide it acts as a catalyst so that it accelerates chemical reaction
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What do these two changes have in common?
an engine using gasoline to power a car
cellular respiration
Select all that apply.
Both are only physical changes
Both converse mass
Both are chemical changes
Both are caused by heating
Answer: Both are only physical changes
Both converse mass
Explanation: the first two ones r correct
Which supports the idea that conservation of mass is a scientific law instead of a hypothesis?
A- It is an educated guess.
B- It has been tested and supported once or twice.
C- It has been examined, tested and supported over centuries.
D- It has been tested many times and sometimes is true and sometimes isn’t.
Answer:
C- It has been examined, tested and supported over centuries.
Explanation:
The conservation of mass is a scientific law that states that matter cannot be created or destroyed, only transformed from one form to another. This law has been extensively tested and supported over centuries of scientific investigation, and it is considered to be a fundamental principle of chemistry and physics.
What causes stress in rocks? and What happens when stress is released?
Complete this Lewis structure for S2O32− by adding lone pairs and formal charges.
Add lone-pair electrons and formal charges to this structure.
The complete lewis structure is shown in the below figure by adding lone pairs and formal charges.
Assign the valence electrons to each atom as dictated by the periodic table placing one electron at each compass direction and then pairing them only after the first four until you have place all of the atom’s valence electrons. (See the Roman numeral above the group/column it is in.)
Arrange the remaining atoms around the central atom and join them to the central atom by a single bond. The more electronegative atoms are typically farther away from the center and attaching hydrogen last is advised.
Lone electrons (not lone pairs) indicate an ability to form more covalent bonds, resulting in either double or triple bonds. Their presence or the lack of a full octet on any atom indicates there is a better Lewis structure.
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A gas made up of atoms escapes through a pinhole 0.920 times as fast as Cl 2 gas. Write the chemical formula of the gas
Answer:
The gas with molar mass 83.9 g is Krypton, Kr
Explanation:
We know that as per Ghram's law of diffusion,
r'/ r= square root (M/M')
0r [tex]\frac{r'}{r } =\sqrt{\frac{M}{M'} }[/tex]
Where
r= rate of diffusion of Cl2
r'= rate of diffusion of unknown gas= 0.920r
Also, M= molar mass of Cl2= 71 g/ mol
And, M'= molar mass of unknown gas which we have to find
Let us substitute the values in above equation
[tex]\frac{0.920r}{r } =\sqrt{\frac{71}{M'} }[/tex]
solving we get M' = 83.9 g/mol
Therefore, the gas with molar mass 83.9 g is Krypton,Kr
Cobalt-60 is a beta emitter with a half-life of 5.3 years. Approximately what fraction of cobalt-60 atoms will remain in a particular sample after 26.5 years
The fraction of cobalt-60 atoms remaining after 26.5 years is approximately 0.25 (1/4).
What is atom?An atom is the smallest unit of matter that still retains its properties. It consists of a nucleus, which is made up of protons and neutrons, surrounded by electrons that orbit the nucleus. Atoms are the building blocks of all matter and can combine to form molecules. Atoms are also constantly in motion and can be found in everything from air to rocks. They are essential for life, as they make up all the molecules that form the cells and organs in the human body.
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Awarding 50 points for this question!!
From the paragraph in the image, what are the independent, dependent, and control variables?
Answer:
there is no paragraph
Explanation:
Calculate the number of molecules in 9.03 liters of carbon dioxide gas at standard temperature and pressure.
9.03 liters of carbon dioxide gas would contain 0.40 moles of carbon dioxide molecules. Since 1 mole of any gas contains 6.02 x 10^23 molecules, the number of molecules of carbon dioxide gas in 9.03 liters of carbon dioxide gas at STP would be 2.41 x 10^23 molecules.
What is molecules?Molecules are the smallest units of matter that can exist by themselves. They are composed of two or more atoms that are held together by chemical bonds. Molecules can be found in the air we breathe, the water we drink, and the food we eat. They can also be found in living organisms, like plants and animals. Molecules can be made of a variety of different atoms, such as oxygen, carbon, nitrogen, and hydrogen.
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