One of the lab groups unintentionally left a beaker with 1.00 M1.00 M of NaOH solution out on the lab table over night. The molarity of the solution is 3.00 M after evaporation.
The total moles of solute contained in a given volume of solution is referred to as a solution's molarity. In this case, "M" stands for molarity, "n" is the number of moles of solute present in the solution, and "V" is the volume of solution present in a container. A unique kind of homogenous mixture made up of two or more components is known as a solution in chemistry. A solute, or substance that is dissolved in a solvent, is one of the components of such a mixture.
Moles = 1.00/1/3 Moles = 3.00 M
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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 you work with a chemical that emits hazardous vapors or fumes, what is the best way to protect yourself
When we work with a chemical that emits hazardous vapors or fumes, the best way to protect ourself is by using the fumes hood when working with chemicals.
The best way to protect ourself from the chemical fumes or vapor is the work with chemicals in the fumes hood. the fume hood is the ventilation device that limits the exposure of the hazardous fumes or the vapors.
There are several other ways to protect ourself from the chemical fumes are :
use the chemicals protective clotheswear the respiratory protectionuse the glovesalso wear the eye protectorThese are the some methods use to protect ourself from the chemical fumes or vapors.
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If an automobile air bag has a volume of 11.8 L, what mass of (in g) is required to fully inflate the air bag upon impact
22.3 g of NaN₃ are required to fully inflate an airbag of 11.5 L at STP.
What is decomposition reaction?Chemical decomposition, also known as chemical breakdown, is the process of breaking down a single chemical entity into two or more components. Chemical breakdown is commonly thought of and characterized as the inverse of chemical synthesis. When one reactant breaks down into two or more products, this is referred to as a decomposition reaction. This is expressed by the following generic equation: AB A + B. The breakdown of hydrogen peroxide to water and oxygen is an example of a decomposition process, as is the breakdown of water to hydrogen and oxygen.
Here,
In airbags, sodium azide decomposes to form sodium and nitrogen gas, which inflates the bag. The decomposition reaction is:
2 NaN₃ ⇒ 2 Na + 3 N₂
We can calculate the mass of NaN₃ needed to produce 11.5 L of N₂ at STP, using the following relations.
At STP, 1 mole of N₂ occupies 22.4 L.
The molar ratio of N₂ to NaN₃ is 3:2.
The molar mass of NaN₃ is 65.01 g/mol.
=11.8*1/22.4*2/3*65.01/1
=118/112*21.67
=22.82 g
22.3 g of NaN₃ are required to fully inflate an airbag of 11.5 L at STP.
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Which statement best explains why the atomic theory developed efficiently?
Scientists ignored all previous knowledge about atoms.
Scientists had used creativity and the scientific method in their investigations.
Scientists had used a philosophical viewpoint as a method of investigation.
Scientists rarely repeated experiments to make sure the results were correct.
The statement which best explains why the atomic theory developed efficiently is that scientists had used creativity and the scientific method in their investigations regarding the atom.
What is an atom?
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
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Answer: the answer is B
Explanation: just did it hope it helps
If methane (CH4) has a tetrahedral molecular geometry, which of the following diagrams most likely represents its Lewis dot structure
The carbon atom is in the center of the structure and is surrounded by four hydrogen atoms.
What is structure?Structure is an organized arrangement of elements, such as components, materials, people, or ideas. It is a way of organizing and arranging the components of a system in order to achieve a desired outcome.
The most likely Lewis dot structure for methane (CH4) is the following:
The carbon atom is in the center of the structure and is surrounded by four hydrogen atoms. Each hydrogen atom has one electron in its outer shell, and the carbon atom has four electrons in its outer shell. All of the atoms are arranged in a tetrahedral shape, which matches the molecular geometry of methane.
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How many moles of aspartame are present in 4.50 mg mg of aspartame?
1.53 × 10⁻⁵ moles of aspartame are present in 4.50 mg of aspartame.
Two amino acids, aspartic acid and phenylalanine, make up the low-calorie sweetener known as aspartame. In addition to being present in tabletop sweetener packets, aspartame is a common component used to substitute sugar in low-calorie foods and beverages.
Here there are 4.50 mg of aspartame.
First, the mass is converted from mg to g by:
1 g = 1000 mg
So, 1 mg = 0.001 g
So, 4.5 mg = 4.5 × 10⁻³ g
Molar mass of aspartame = 294.40 g/mol
So, Number of moles of aspartame = [tex]\frac{Given mass}{Molar mass}[/tex]
or, n = 4.5 × 10⁻³ / 294.3
or, n = 1.53 × 10⁻⁵ moles.
Hence, 4.50 mg of aspartame has 1.53 × 10⁻⁵ moles of aspartame.
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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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In this redox reaction, identify the element that was reduced. Fe2O3 3CO 2Fe 3CO2 A. C B. CO C. Fe D. FeO E. O
the element that was reduced in this redox reaction is Fe
A redox reaction, also known as an oxidation-reduction or redox reaction, involves the exchange of electrons between chemical entities (the atoms, ions, or molecules involved in the reaction). Redox reactions occur everywhere; they are involved in the burning of fuels, the rusting of metals, and even the processes of photosynthesis and cellular respiration.Some species experience oxidation, or the loss of electrons, while others experience reduction, or the gain of electrons, during a redox process. Take rust, which results from the interaction of iron and oxygen:The third selection from the options presented above is the right response. The element that was reduced in the described redox reaction was Fe, or iron. It now has a neutral charge after having its +3 charge lowered.
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If the garbage truck and minivan in Part A get into an accident with each other, how can safety restraints in a car can save a life? Explain your response using one of Newton’s laws.
Which of Newton’s laws of motion act upon the vehicles at the point of impact? Explain your answer
Newton's law of motion that act upon the vehicles at the point of impact is the second law of motion.
Newton's second law of motion states that the force applied to an object is directly proportional to the rate of change of momentum that is produced. Mathematically, we have;
F = m·v - m·u/Δt
Where;
m = The mass of the object
v = The final velocity of the object
u = The initial velocity of the object
Δt = The duration of motion of the object during change in velocity
Therefore, given that the mass, 'M', of the truck is larger than the mass, 'm', of the minivan, where the time of change in velocity Δt, and the initial and final velocities of both automobiles are the same such as in a sudden stop, the garbage ruck will exert more force than the minivan, and therefore, the garbage truck has a greater initial momentum before the automobiles are brought to a stop.
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What are true about water changing states?
Answer:
The last one is true.
7. What is one of the BEST actions the US government can take to slow global warming?
-provide tax credits to those who carpool
-encourage people to buy electronic books versus paperbacks or hardbacks
-produce commercials that urge people to recycle
-invest in clean technologies such as wind and solar power
one of the BEST actions the US government can take to slow global warming is invest in clean technologies such as wind and solar power
What is the US government doing about global warming?EPA works with industry and others to reduce greenhouse gas emissions through regulatory initiatives and partnership programs. Within the Agency, EPA implements a range of strategies to reduce its own greenhouse gas emissions, increase energy efficiency, and take other steps to reduce its carbon footprintReaching 100% carbon pollution-free electricity by 2035. Achieving a net-zero emissions economy by 2050. Delivering 40% of the benefits from federal investments in climate and clean energy to disadvantaged communitiesMobilizing a whole-of-government approach, the United States is scaling up action at home and abroad to put the world on a path to reach net-zero emissions by 2050 and to achieve the global goal on adaptation. Learn more about the United States at COP27 and the U.S. Center
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While massing a hazardous solid on the balance, a lab student finds the amount taken is larger than needed and removes a small portion with a spatula. What is the recommended strategy for dealing with the excess material
As with any laboratory work, adequate facility design, operation, and monitoring, as well as excellent work practices, are necessary to protect laboratory staff against the hazard.
Both degrees of protection are based on the principle of ALARA (as little as reasonably possible) exposure. Electricity Risks By adopting adequate measures, the electrocution dangers of electrically powered instruments, tools, and other equipment are nearly completely minimized, therefore their use in the hazard need not represent a serious risk. You need the correct sort of scales if you want to weigh laboratory samples accurately. To accurately weigh the lab samples, for instance, you may use an analytical balance. The reliability of the weighing device will determine how accurate and precise the findings are.
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Determine whether each of the following compounds is a molecular compound or an ionic compound. How can you tell?
a. ) PBr₃
b. ) KBr
c. ) Iron (III) Oxide
d. ) Carbon Tetraiodide
PBr₃ and Carbon Tetraiodide is a covalent compound. Whereas, KBr and Iron (III) Oxide is an ionic compound.
Covalent compounds and molecular compounds are those compound where two non-metals, or a non-metal are bonded to each other through the sharing pair of electrons.
PBr₃ are covalent because phosphorous is in the column 3 in periodic system and it has three valence electrons in its outer shell. Therefore, in case of Carbon Tetraiodide carbon and iodide both are non-metals that why they are covalent compounds.
KBr and Iron (III) Oxide both are Iron (III) Oxide because they are formed by the interaction between a metal and non-metal. They will transfer the electrons from positively to negatively charged atoms.
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Everyone!
Give a Question/Problem for Hot and Cold Compress Pillow
Thank you!!
Answer:
are u good at geometry math? their are some questions I didn't understand it PLEASE
When heated, calcium carbonate forms calcium oxide and carbon
dioxide.
The equation for the reaction is:
CaCO3 + CaO + CO2
The relative atomic masses are Ar Ca = 40, C = 12,0 = 16
A student heated 25 g of calcium carbonate.
What mass of carbon dioxide was produced?
I
Mass of carbon dioxide =
(4 marks)
When calcium carbonate is heated, it breaks down into the components calcium oxide and carbon dioxide.
What do you mean by calcium carbonate?
Calcium carbonate is a chemical compound that has the formula CaCO3. It is a common mineral found in rocks as calcite and aragonite, and it is the main component of pearls and the shells of marine organisms, snails, and eggs. Calcium carbonate is a component of agricultural lime that is formed when calcium ions in hard water react with carbonate ions to form limescale. It's commonly used in medicine as a calcium supplement or an antacid, but too much of it can be dangerous.
25 g of calcium carbonate contains 25/100 x (40 + 12 + 3 x 16) = 25/100 x 88 = 22 g of calcium and 12 g of carbon.
Hence, mass of carbon dioxide produced is 12 g.
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How do temperature differences in the layers of Earth move magma?
A.Cooling magma becomes more dense and sinks, while hotter magma near the core is less dense and rises, moving magma in a cyclic path.
B.Cooling magma becomes less dense and sinks, while hotter magma near the core is more dense and rises, moving magma in a cyclic path.
C.Cooling magma becomes more dense and sinks, while hotter magma near the core is less dense and rises, moving magma in a linear path.
D.Cooling magma becomes less dense and sinks, while hotter magma near the core is more dense and rises, moving magma in a linear path.
Answer: A
Explanation:
Cooling magma becomes more dense and sinks, while hotter magma near the core is less dense and rises, moving magma in a cyclic path.
This answer was obtained from a credible source after doing some research.
The temperature differences in the layers of Earth move magma as cooling magma becomes more dense and sinks, while hotter magma near the core is less dense and rises, moving magma in a cyclic path.
What is magma?Magma is the molten or semi-molten natural material from which all igneous rocks are formed.Magma is found beneath the surface of the Earth, and evidence of magmatism has also been discovered on other terrestrial planets and some natural satellites.Besides molten rock, magma may also contain suspended crystals and gas bubbles.
Magma is produced by melting of the mantle or the crust in various tectonic settings, which on Earth include subduction zones, continental rift zones,mid-ocean ridges and hotspots. Mantle and crustal melts migrate upwards through the crust where they are thought to be stored in magma chambers or trans-crustal crystal-rich mush zones. During magma's storage in the crust, its composition may be modified by fractional crystallization, contamination with crustal melts, magma mixing, and degassing.
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what are the two quantities in this module for which we will develop unit factors to do dimensional analysis with chemical substances?
The two quantities in this module for which we will develop unit factors to do dimensional analysis with chemical substances are volume and mass.
What is Volume?
Volume is a measure of the amount of three-dimensional space occupied by an object or substance. It is often measured in liters, cubic centimeters, or cubic meters. Volume is used to measure the capacity of a container, the size of an object, or the amount of liquid or gas in a given space. It is also used to determine the mass of an object, as the density (mass per unit volume) is often known.
The two quantities of volume and mass are important for doing dimensional analysis with chemical substances because they help to measure the amount of a substance in different units. Volume is important for measuring the quantity of liquid substances, and mass is important for measuring the quantity of solid substances. Both of these quantities are necessary for accurate and precise measurements of chemical substances, making them essential for dimensional analysis.
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For parts of the free response question that require calculations, clearly show the method used and the steps involved in arriving at your answers. You must show your work to receive credit for your answer. Examples and equations may be included in your answers where appropriate. Answer the following questions related to the analysis of CaBr2. (a) A student has a 10.0g sample of CaBr2. Show the setup of the calculation to determine the number of moles of CaBr2 in the sample. Include units in the setup. (You do not need to do any calculations.)
10.0g of CaBr2 contains 0.05 mol according to the equation mole(n) = mass / molar mass (10.0g CaBr2 x 1 mol CaBr2 / 199.88 g CaBr2 = 0.05 mol)
What exactly does the word "mole" mean?The mole, represented by the symbol mol, is the SI unit of material quantity. One mole is made up of precisely 6.022*1023 elementary components. The Avogadro number, NA, as expressed in mol1, is the fixed numerical expression of the Avogadro number.
Is a mole considered a mass unit?The weight in grams of 1 mole of a certain substance is its molar mass. The atomic mass of the chemical unit, expressed in atomic mass units, determines the mass of a substance (amu).
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What is the molecular formula of a compound that has an empirical formula of CH2O and a molar mass of 120.12 g/mol
The molecular formula of a compound that has an empirical formula of CH₂O and a molar mass of 120.12 g/mol is C₄H₈O₄.
A molecular formula shows the number of different types of atoms that are present in a molecule whereas an empirical formula represents the simplest whole number ratio of the different atoms present in a molecule.
Given,
empirical formula= CH₂O
molar mass = 120.12 g/mol
To find: molecular formula
we know that,
atomic mass of carbon= 12 g/mol
atomic mass of hydrogen= 1g/mol
atomic mass of oxygen= 16 g/mol
molar mass of CH₂O
= (12+ 1×2 + 16) g/mol
=30 g/mol
therefore, molecular formula
⇒(CH₂O )n = 120.12
⇒30 n= 120.12
⇒n=120.12/30
⇒n= 4.004
⇒n≈4
Thus,
(CH₂O )n = (CH₂O )4 =C₄H₈O₄
Hence, molecular formula is C₄H₈O₄
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Why do the fourth and fifth periods contain 18 elements rather than 8 as observed in the second and third periods?
The fourth and fifth periods contain 18 elements rather than 8 as observed in the second and third period because of the accommodation of 10 additional electrons in the 3d orbital.
The number of orbitals that can be accommodated by s subshell is one, p subshell is three, d subshell is five and f subshell is seven.
In the second and the third period, the 2s subshell is filled with two electrons, 2p subshell with six electrons .So, the second period contains eight elements. The sequence in third period is similar to that of second period with additional filling of 3s and 3p subshell.
In the fourth period, electrons are first filled in the 4s subshell, only after that they can be filled in the 3d subshell. So, fourth period contains 18 elements , which is due to the additional 10 electrons in 3d subshell. This is similar in the case of fifth period also.
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What molecule solid would have the highest melting point?
Answer:
Explanation:
They are Covalent networks solids
Do you multiply grams to moles?
a supporter of the phlogiston theory says that when petrol burns in air phlogiston is lost in the air so the mass decreases. Write a letter to this person explaining why the phlogiston theory is wrong
Phlogiston theory is wrong as it states that when petrol burns in air phlogiston is lost in air so the mass decreases but as per law of conservation of mass , mass never increases or decreases rather it is constant.
What is law of conservation of mass?According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.
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Please help me thank u sm
The amount of suplher in grams to rpoduce 25.9 kJ energy= 10.95g
Here the reaction is,
S(s) + 2CO(g)
Hrxn=-75.8 kJ energy.
Answer,
The amount of Sulpher in grams to produce 25.9 kJ energy= xg=?
We know that 1mole Sulpher results in the production of \ bigtri angle up Hrxn=75.8 kJ/mol energy.
25.9 kJ of energy produced from how many grams of sulpher= 25.9 kJ / 75.8 kJ/mol = 25.9g/75.8g/mol
=0.34 mol of sulpher
The amount of 0.34 moles of sulpher in grams= Number of moles * Molar mass
( Molar mss of Sulpher= 32.06g'/mol)
= 0.34mols * 32.06g /mol
=10.95 g
The amount of suplher in grams to rpoduce 25.9 kJ energy= 10.95g
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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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Do the same enthalpy calculation for the products of the reaction, CO2+2H2O. Carefully count how many of each bound there is, and consider whether bonds are single or double bonds. Show work!!!!!! and list the totalbond enthalpy of the products.
The enthalpy of the reaction from the bond energy is +102 kJ/mol. Option C
What is the enthalpy of the reaction?We have to note that the enthalpy would have to do with the energy that ahs been absorbed or the energy that is released in a reaction. We know that if there is a release of energy then we can say that the reaction is exothermic but if we have a case where the energy has been taken in then we can say that the reaction in that case can be said to be exothermic.
We can see that the enthalpy of the reaction can be calculated on the basis of the bond energy when we write;
Energy of bonds that are broken - Energy of bonds that are formed.
[4(410) + 2(496)] - [2(805) + 2(460)]
(1640 + 992) - (1610 + 920)
2632 - 2530
= +102 kJ/mol
Hence, by calculation of the enthalpy bof the reaction, we can see that the reaction would absorb about 102 kJ of heat per mole of the reactant as shown.
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dental cement, Zn3(PO4)2
Give only the names of the elements alphabetically, separating them with commas.
Zinc, phosphorus and oxygen are elements contained in dental cement (Zn₃(PO₄)).
Dental cements have a wide range of dental and orthodontic applications. Common uses include temporary tooth restoration, lining cavities to protect the pulp, sedation or isolation, and cementation of fixed prosthetic devices.
A cement-retained bridge is simply a dental device that is permanently fixed in the mouth to restore the mouse's function and aesthetics and to prevent many of the consequences of tooth loss that affect the immediate aftermath of losing natural teeth.
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Place the following in order of increasing radius.
Br- Na+ Rb+
The order of increasing radius is: Na+ < Rb+ < Br-
The radius of an atom or ion is a measure of the size of the atomic nucleus and the electron cloud that surrounds it. The radius of an atom or ion can be affected by various factors such as the number of protons, neutrons and electrons it has, as well as the electron configuration. In general, as we move from left to right across the periodic table, atomic radius tends to increase.
In the case of the three ions you provided, Br-, Na+ and Rb+ , the order of increasing radius is as follows:
Na+ has the smallest atomic radius among the three, as it has lost one electron and become a positive ion, the removal of the electron increases the effective nuclear charge, making the electron cloud more tightly held.
Rb+ has a slightly larger atomic radius than Na+ as it has one more electron and one more proton in its nucleus than Na+, making the electron cloud slightly less tightly held.
Br- has the largest atomic radius among the three as it has gained an electron and become a negative ion, the addition of the electron decreases the effective nuclear charge, making the electron cloud less tightly held.
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(HURRY) Watch the Candy Shop video. In this reaction, a student determined that the mass of the carbon product was less than the mass of the sulfuric acid and sugar that were combined. How would you account for this loss of mass? Use evidence and scientific reasoning to support your answer
The loss of mass can be accounted for by the energy released during the reaction. When the sulfuric acid and sugar mix, the reaction produces carbon dioxide gas, which has a much lower mass than the original reactants. This is because the reaction releases energy as heat, which causes the molecules to break apart and form the gaseous carbon dioxide.
What is molecule?Molecule is the smallest unit of a substance that has all the properties of that substance and is made up of two or more atoms bonded together. Molecules can either be made of elements or a combination of elements and compounds. Molecules can be described as the building blocks of matter, made up of atoms. Atoms are made up of protons, neutrons, and electrons, and the arrangement of these particles determine the type of molecule.
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Paper chromatography is a process used to separate mixtures of substances into their components. The components are carried by a mobile phase through a stationary phase made of absorbent paper. An investigation analyzed a sample of black ink to determine its components.Which property allows the components to separate
Because of its simplicity, comparatively low cost, great sensitivity, and rapid separation, TLC is an extensively used analytical method.
Using a thin stationary phase supported by an inert backing, thin layer chromatography (TLC) is a chromatographic technique used to separate the components of a mixture. It can be carried out on an analytical scale to track the development of a reaction or on a preparative scale to purify minute quantities of a chemical. Similar to all chromatography, TLC works on the premise that a chemical will have varying affinities for the mobile and stationary phases, which will influence how quickly it migrates. TLC aims to produce well-defined, well-separated spots.
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