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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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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.
For each of the following molecules, would you expect greater solubility in water or in hexane?
a. toluene
b. sucrose (table sugar)
c. isobutene
d. ethylene glycol
Answer:
a
Explanation:
boiling point of 111ºC and hexane, with a boiling point of 69ºC, is 42ºC, making these two substances most easily separated
Why do you think the author chose to organize the information this way
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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The theoretical yield of NaBr from 2.36 mol FeBr3 is 7.08 mol NaBr. What is the percent yield if 6.14 mol NaBr were collected?
The percent yield for the reaction in this example is 100%, which is equal to the theoretical yield of NaBr from 2.36 mol FeBr3 of 7.08 mol NaBr.
What is NaBr's theoretical yield?The lesser amount, or 13.7 g NaBr, represents the potential yield. 15.45 grams of NaBr can never be produced because after 13.7 grams of NaBr are created, the reaction runs out of NaI and stops generating NaBr product. As the limiting reactant, NaI is well-known.
How is % yield determined?The final answer is expressed in percent by dividing the experimental yield by the theoretical yield and multiplying the result by 100. In general, the percent yield value is less than 100%,
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Answer: 87%.
Explanation:
how many sublevels are in Silicon
There is 5 orbitals!
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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?
What mass of silver chloride can be prepared by the reaction of 170.0 mL of 0.23 M silver nitrate with 200.0 mL of 0.18 M calcium chloride
2.87 g of silver chloride can be made by reacting 200.0 mL of calcium chloride with 170.0 mL of silver nitrate, both of which have a 0.23 M silver nitrate concentration. Chemically, silver chloride is a substance.
AgCl is the chemical formula for this. It is generally known that this white crystalline substance is only weakly soluble in water. Silver chloride changes from grey to black or purplish in hue upon illumination or heating, indicating the presence of silver. As the mineral chlorargyrite, AgCl can be found in nature. Chemical processes take place everywhere around us, from the food our bodies metabolize to how the sunlight we receive is produced.
silver chloride mass: m (AgCl)=0.02*143,32g/mole=2.87 g, where n (AgCl) = (0.02*2)/2=0.02 moles.
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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?
Which freezes faster, hot water or cold water?
Answer: Hot water freezes faster.
Explanation: It is because of the Mpemba effect taking place, and even though it seems impossible, it could have less dissolved gas in it, or even take up less mass because of this.
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
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
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
When methane is burned with oxygen, the products are carbon dioxide and water, If you produce 20 grams of water and 10 grams of carbon dioxide from 15 grams of oxygen, how many grams of methane were needed for the reaction?
Answer:
4 g
Explanation:
First you need to write a balanced chemical equation. You are given thatmethane is burned, meaning a combustion reaction in which carbon dioxide and water are released.
Unbalanced: CH4 + O2 ---> CO2 + H2O
Balanced: CH4 + 2O2 ---> CO2 + 2H2O
Givens:
X grams CH4 (Molecular mass 16.0 grams)
9 grams H2O (Molecular mass 18.0 grams)
11 grams CO2 (Molecular mass 44.0 grams)
Mole ratio: 1:2:1:2 (CH4:O2:CO2:H2O)
Then you need to find which of the reactants are the limiting reactant and which is the excess reactant. The limiting reactant is what you will base the rest of the problem on. To do this, you convert each measurement to moles from grams.
11 g CO2 / (44.0 g) = 0.25 moles CO2
9 g H2O / (18.0 g) = 0.5 moles
n of CH4 = n of CO2 = n of H2O /2 = 0.25 moles
m of CH4 = n* Mw = 0.25 * 16.0 = 4 g
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.
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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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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I need to know the Lewis structure for
CCI4
H2O
O2
N2
PH3
Please and thank you.
Two solitary sigma bonds are visible in the Lewis structure between the hydrogen and oxygen atoms.
What is Lewis structure explain with example?The octet rule is a theory that describes how atoms share electrons so that each atom has eight electrons in its outer shell. This idea is the foundation of a Lewis structure. An oxygen atom, as an illustration, has six electrons in its outer shell.
The entire molecule's electron density is concentrated only around the core C in the CCl4 Lewis structure. Two nitrogen atoms are connected by a triple bond in the N2 Lewis structure.
In the reaction described above, PH3 is acting as a Lewis base because of the single electron on the P atom.
A double bond exists between two oxygen atoms in the Lewis structure of O2. Oxygen atoms must form two bonds in order to comply with the octet rule. The oxygen (red) and hydrogen (white) atoms are held together by powerful connections known as covalent bonds.
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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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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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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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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
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
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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please help with this question
Fe(OH)3
⎯⎯→
Fe2O3
⎯⎯→
Fe
⎯⎯→
FeCl2
⎯⎯→
Fe(OH)2
Answer:
decomposition reaction
When you go to the doctor for an illness, the doctor asks you how you feel. You describe all your symptoms. Then, the doctor makes a hypothesis about which organ system is having problems. Read each set of symptoms below. Then, match each set of symptoms with the the appropriate organ system.
stomach ache, gassy, ___________________________
no appetite
sneezing all the time, runny nose, __________________________---
trouble breathing, coughing
having a very hard time remembering people's
names, feeling sad and anxious _______________________
seem to be catching every disease that comes around,
taking a long time to get better ________________________-
1. Respiratory System
2.Nervous System
3.Immune System
4.Digestive System
Stomach ache, gassy ,no appetite is related to problems with digestive tract while sneezing all the time, runny nose is related to respiratory system while having a very hard time remembering people's is related to nervous system while seeming to be catching every disease that comes around,taking a long time to get better is related to immune system.
What is digestive tract?
It consists of the gastrointestinal tract along with the accessory organs which are present in digestion process . It involves the breakdown of complex food into smaller components which can be easily assimilated and absorbed by the body.
The digestion process has 3 phases: cephalic phase , gastric phase and intestinal phase.Cephalic phase begins with secretion of gastric juices from gastric glands in response to sight and smell of food.It involves chewing and chemical breakdown of food by the action of digestive enzymes ,saliva in the mouth contain enzymes like lipase and amylase which are secreted by the salivary and serous glands present on the tongue.
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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:
How can you tell by looking at the graph if a substance is solid, liquid, or gas at room temperature?