If the elements achieve the following ions then they are likely to attain the noble-gas configurations. The example of elements attaining ionic forms are given below:
[Ne], N3−
[Ar], Ca2+
[Ar], S2−
[Kr], Br−
Noble gas configuration refers to the symbol of the last Nobel gas and the configuration of the remaining electrons of the atom preceding that Nobel gas.
According to the Nobel gas configuration, if an atom has 8 electrons in the valence shell then it becomes the most stable atom.
All noble gases have eight electrons in their outermost shells making them the most stable and inert elements of the periodic table.
For example, the Neon symbol refers to the standard Nobel gas configuration thus making the noble gas configuration for sodium [Ne]3s1.
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Sample of gas occupies a volume of 64.9 ml. as it expands, it does 124.0 j of work on its surroundings at a constant pressure of 783 torr. what is the final volume of the gas?
The final volume of the gas is 123.9ml.
Given here, the pressure of the gas (P)= 783 torr = 1.03 atm (1atm = 760torr) and work done = 124joules.
The initial volume given here V₁= 64.9ml Or 64.9× 10⁻³l ( 1ml =10⁻³l) .
Now we calculate the final volume by work done formula,
Work done = P(V₂-V₁)
124 = 1.03( V₂- 64.9× 10⁻³)
On calculating this we get,
V₂= 123.9ml or 123× 10⁻³.
So, the final volume calculated and found to be 123.9ml or 123× 10⁻³.
Work done for a gas is defined as the pressure change multiplied by a volume change in the gas.
Thermodynamics is branch which examines a system’s energy and work. This branch of science, thermodynamics examines how heat, work, temperature, and energy are related. The thermodynamics refers to the transfer of energy from one location or form to another. The fundamental idea is that heat is a type of energy that is equivalent to a specific quantity of mechanical labour.
There are three most important laws of thermodynamics, they are zeroth law, first law, second law and third law of thermodynamics which have specific definitions.
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Which of the follwoing molecules will form hydrogen bonds? (ch3)3n (ch3)2nh fch2ch2f ch3och3
The follwoing molecule will form hydrogen bonds: (CH₃)₂NH.
Dimethylamine ((CH₃)₂NH) has a hydrogen atom directly attached with nitrogen atom, so can make an intermolecular hydrogen bond with the same molecule (see the picture below).
Hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (H), covalently bound to a highly electronegative atom such as flourine (F), oxygen (O) and nitrogen (N) atoms.
Trymethylamine ((CH₃)₃N), 1,2-difluoroethane (FCH₂CH₂F) and dimethyl ether (CH₃OCH₃) do not form the hydrogen bonds, because there are no hydrogen atoms attached directly to the fluorine (F), nitrogen (N) or oxygen (O) atoms.
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Earth has experienced many long periods of climatic cooling during which glaciers cover large areas of Earth. These periods are known as ice ages. Which of the following is a likely cause of ice ages?
A.
periodic changes in the shape of Earth's orbit
B.
the movement of the continents due to continental drift
C.
the shutdown of thermohaline circulation in the ocean
D.
periodic reversals to Earth's magnetic field
The phenomenon of the 'periodic changes in the shape of Earth's orbit' likely caused ice ages in the past (Option A).
What caused the ice ages?The ice ages are periods in the geological past in which temperature drastically decreased over thousands of years, which may be due to different factors such as Earth's orbital changes, volcanoes, modification in the ocean currents, amount of solar radiation, increase in the CO₂ and global warming, etc
In conclusion, the phenomenon of the 'periodic changes in the shape of Earth's orbit' likely caused ice ages in the past (Option A).
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Could changes in polar ice far away be causing sea levels around the world to rise over time? Why or why not?
Explanation
As temperatures rise, glaciers melt faster than they accumulate new snow. As these ice sheets and glaciers melt, the water eventually runs into the ocean, causing sea level to rise. Icebergs and frozen seawater also melt in warm temperatures but are not significant contributors to sea level rise.
When glaciers collapse and pieces of glacial ice fall into the ocean, they are called icebergs. Because the water from melting glaciers is held on land, the runoff greatly raises the volume of water in the ocean, causing a rise in sea level.
The enormous ice sheets that are present in Greenland and Antarctica are also referred to as glaciers. Glaciers melt more quickly as temperatures rise than they can store new snow. As these glaciers and ice sheets melt, the water eventually enters the ocean, raising the sea level.
Changes in the amount of sea ice can impede the regular flow of the ocean, which can impact the climate globally. The polar regions are the most vulnerable regions on Earth to climate change because even a slight temperature increase can cause larger warming over time.
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When two monosaccharides condense to form a disaccharide, what is the other product of the reaction? enter the molecular formula.
When two monosaccharides combine to make a disaccharide, water is the byproduct.
What are monosaccharides ?The most fundamental building blocks from which all carbohydrates are constructed are monosaccharides, commonly known as simple sugars. They are the most basic types of sugar. They are typically crystalline solids, colorless, and soluble in water.
These three monosaccharides—glucose, fructose, and galactose—are crucial for nutrition. Six carbon atoms, twelve hydrogen atoms, and six oxygen atoms make up each single sugar molecule.
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Cells can best be described as what?
A.
part of the air people breathe.
B.
tiny particles found in food.
C.
the smallest form of matter.
D.
building blocks of all living things.
Answer:
D
Explanation:
because all cells in our body help us to build the body because they are multicellular
Answer: D) building blocks of all living things
Explanation:
I need help asap pleaseee
Answer:
4x10 4,000,000
8x10 80000
Explanation: FOr the problems i couldnt put the 6 and 4 so i just wrote it like that
Questions 1-10: Complete the Bohr
Mode for each following elements.
Answer:
proposed an early model of the atom as a central nucleus containing protons and neutrons being orbited by electrons in shells. As previously discussed, there is a connection between the number of protons in an element, the atomic number that distinguishes one element from another, and the number of electrons it has. In all electrically-neutral atoms, the number of electrons is the same as the number of protons. Each element, when electrically neutral, has a number of electrons equal to its atomic number.
THANKS
3
Explanation:
What 3 properties of the major groove are advantageous to alpha helix insertion?
The major groove allows proteins to detect and attach DNA sequences, conformational DNA alterations, and has gene regulatory proteins.
The major groove and the minor groove are formed by the gaps between the intertwined backbones. The major groove is broader than the minor groove, as you pointed out. Proteins may attach to and detect DNA sequences from outside the helix thanks to these grooves. Because the grooves show the margins of each base pair inside the helix, proteins may chemically identify certain DNA sequences. Once a protein attaches, the DNA may alter in conformation, which may affect how genes are expressed.
Longer DNA sequence lengths may be seen because the primary groove is broader, which also makes it possible to tell one sequence from another. As a result, the major groove is bound by numerous gene regulatory proteins at certain DNA sequences.
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• evolution
• ecosystems
•
•
light and energy
solar system
Earth (or Earth's atmosphere and oceans)
a science topic that is not listed above
List the science topic you have selected here:
Answer:
I dont really understand what you mean by this but if your asking for us to list subjects than i have a few:
.Biology
.Electricity
.The human body (Anatomy)
. Chemistry
(i) Transition elements have similar properties. qua
Explain why in terms of electronic structure.
Since they all have the same number of valence electrons, transition elements share similar characteristics.
Why do elements have similar properties?The quantity of valence electrons in an element determines its physical and chemical properties. The number of valence electrons shared by elements belonging to the same group is constant. As a result, the physical and chemical properties of elements belonging to the same group are similar.
Why is electronic configuration of transition elements irregular?The energy of n1 d orbitals and ns orbitals differs slightly in transitional elements. As a result, an incoming electron may occupy either shell. As a result, the electronic configurations of transition elements show numerous irregularities.
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What is the molarity of a solution that was prepared by dissolving 82 g of cacl2?
The molarity of a solution is 0.909 M.
m(CaCl₂) = 82 g; mass of calcium chloride
M(CaCl₂) = 111 g/mol; molar mass of calcium chloride
n(CaCl₂) = m(CaCl₂) ÷ M(CaCl₂)
n(CaCl₂) = 82 g ÷ 111 g/mol
n(CaCl₂) = 0.74 mol; amount of calcium chloride
V(CaCl₂) = 812 mL = 0.812 L; volume of calcium chloride
c(CaCl₂) = n(CaCl₂) ÷ V(CaCl₂)
c(CaCl₂) = 0.74 mol ÷ 0.812 L
c(CaCl₂) = 0.909 mol/L = 0.909 M; molarity of calcium chloride
Calcium chloride is a inorganic salt with ionic bonds between calcium and chlorine. It is a colorless crystalline solid at room temperature, highly soluble in water.
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Which functional groups are functional group and regent combine to make car basilic acid?
A carboxylic acid is made up of two functional group, alcohol group, involving a hydrogen bond to an oxygen, which is attached to carboxyl group involving carbon double bond to an oxygen.
What are functional group?A functional group is defined as a group of atom or bonds inside a substance that is responsible for the substance unique chemical reaction in organic chemistry.
Some of the major functional group are: hydroxyl, methyl, carbonyl, carboxyl, amino, alcohol, phosphate and sulfhydryl etc.
Carboxylic acid has two types of functional group one is alcohol group and other is carboxyl group.
Thus, carboxylic acid is made up of two functional group, alcohol group, involving a hydrogen bond to an oxygen, which is attached to carboxyl group involving carbon double bond to an oxygen.
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What is the concentration in mass-volume percent for 13.9 g caf2 in 255 ml of solution?
The concentration in mass-volume percent of the solution is: 5.45 %
To solve this problem the formula and the procedure that we have to use is:
% m/v = m(solute)/v(solution) * 100
Where
% m/v = concentration in mass volume percentm = mass of solutev = volume of solutionInformation about the problem:
m(solute)= 13.9 gv(solution)= 255 ml% m/v =?Applying the concentration formula we get:
% m/v = m(solute)/v(solution) * 100
% m/v = (13.9 g/255 ml) * 100
% m/v = 0.0545 *100
% m/v =5.45 %
What is a solution?In chemistry a solution is known as a homogeneous mixture of two or more components called:
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3. What if only 25% of Greenland’s ice melted into the ocean? Explain your reasoning.
Balance the following chemical equation (if necessary): zns(s) aip(s) --> ai2s3(s) zn3p2(s)
The balanced equation is as follows:
3ZnS(s) + 2AiP(s) ⇒ [tex]Ai_{2} S_{3}[/tex] (s) + [tex]Zn_{3} P_{2}[/tex] (s)
To write a balanced equation:
1.The left and right sides of the reaction arrow of a balanced equation have an equal number of each type of atom.
2.The reactants and products are placed on the left and right sides of the arrow, respectively, to create a balanced equation.
3.Coefficients, which appear as a number before a chemical formula, represent moles of a compound. The number of atoms in a single molecule is indicated by the subscripts (numbers below an atom).
4.Multiply the subscript and the coefficient to determine the number of atoms. Add all the atoms on each side of the arrow if the atom is present in more than one reactant or product.
5.The coefficient or subscript "1" indicates that there is just one molecule or atom.
Therefore, the balanced equation is as follows:
3ZnS(s) + 2AiP(s) ⇒ [tex]Ai_{2} S_{3}[/tex] (s) + [tex]Zn_{3} P_{2}[/tex] (s)
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Which of the following organisms could be considered a primary consumer
and a secondary consumer according to the food web?
Snake
Mouse
Fox
Caterpillar
Answer:
Primary - Mouse , Secondary-Snake
Answer:
A Caterpillar is a primary consumer!
A mouse is secondary
and foxes and snakes are tertiary consumers!
Explanation:
Alright so lets looks back
Caterpillars eat leaves and grass called "Producers"
Mouses eat the primary producers and generically make less energy
Foxes and Snakes are the ones who eat the secondary consumers, so they are called tertiary consumers.
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the rock's tendency to do this called
a. inertia
b. weight
c. acceleration
Answer:
a. inertia
Explanation:
Inertia means an object will continue its current motion until some force causes its speed or direction to change. The term inertia is properly understood as shorthand for "the principle of inertia" as described by Newton in his first law of motion.
What is undergoing reduction in the redox reaction represented by the following cell notation? ca(s) | ca 2 (aq) || h (aq) | h2(g) | pt
H+ (aq) undergone reduction in the reaction to form H2(g).
Cell reaction - ca(s) | ca 2 (aq) || h (aq) | h2(g) | pt
In above reaction we can say that ,
Ca(s) lost two e-(s) and became ca+2(aq), that means it is undergoing oxidation by losing to electrons.
In the above redox reaction, H+(aq) gains two electrons and undergone in the reaction to form H2(g), Thus here reduction takes place or we can say that H+ has undergone reduction.
Reduction occurs in the chemical reaction when addition of hydrogen or removal of oxygen takes place. Gaining of electron in the chemical reaction also referred as reduction.
Oxidation refers to the process when element looses it's electron or adding of oxygen or removal of hydrogen takes place.
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what is the valency of elements in the group 'v' of the modern periodic table? what is the reasons for the fact that reactivity of group 'v' elements decrease as we go down in the group?
Answer:
What is the valency of elements in the group 'v' of the modern periodic table?
Answer: -3
What is the reasons for the fact that reactivity of group 'v' elements decrease as we go down in the group?
Answer: On moving down the group, there is a decrease in the electron affinity of elements. It is because, as the size of an atom increases, the valence electrons get further away from its nucleus. Thus, the attraction between them decreases.
Rank the compounds in order of increasing boiling point.
a. ch3(ch2)4i
b. ch3(ch2)5i
c. ch3(ch2)6i
Rank the compounds in order of increasing boiling point:
a. CH₃(CH₂)₄I, b. CH₃(CH₂)₅I, c. CH₃(CH₂)₆I.
The boiling point of a substance is the temperature at which the vapor pressure of the liquid equals the pressure surrounding the liquid and the liquid changes into a vapor.
The boiling point in this example depends on molar mass of the compounds.
The greater the molar mass of the compound, the greater is the boiling point.
M(CH₃(CH₂)₄I) = 197.9 g/mol; molar mass
M(CH₃(CH₂)₅I) = 211.9 g/mol
M(CH₃(CH₂)₆I) = 225.9 g/mol
The compound CH₃(CH₂)₆I has the greater molar mass, so it has the greatest boiling point.
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Sometimes when performing a crystallization, one solvent alone will not work and you have to use a solvent-pair. Will the solvent pair hexane and diethyl ether work? why or why not?.
Yes, hexane and diethyl ether, a solvent pair, will definitely function as a team during crystallization.
This is due to the fact that crystal formation requires a miscible solvent pair. Normally, two solvents—one in which the compound is soluble and one in which it is not—are required for crystallization. Additionally, these two solvents ought to mix easily.
Hexane and diethyl ether, the given solvent pair, are miscible with one another. Therefore, we can crystallize using the solvent pair mentioned above.
What is crystallization?
Crystallization is the process of increasing the concentration of a solution to a supersaturated state in order to form solid particles in a homogeneous phase. Crystallization is the process by which crystals are formed from either melted material or a solution.
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A+sample+of+hamburger+had+a+total+mass+of+200.+g,+of+which+30.0+g+was+found+to+be+fat.+what+is+the+percent+of+fat+in+this+hamburger+sample?
a. 15.0%
b. 30.0%
c. 6.00%
d. 13.3%
e. 6.67%
A+sample+of+hamburger+had+a+total+mass+of+200.+g,+of+which+30.0+g+was+found+to+be+fat.
The percentage of fat that was in the hamburger is:
a. 15.0%
What is fat?
Our diets include nutrients that provide us energy and other things our bodies require. Proteins, lipids, and carbs make up the three main types of nutrients in meals. Fat is the primary energy storage type in the body and is used as a fuel source by the body.
The sample of hamburger has a weight of 200g, of which 30g is fat.
Thus, the amount that is the percentage of fat in the sample of the given hamburger is = 30*100/200 percent
= 15 %
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When water dissolves a substance, weak charges on water molecules attract oppositely charged portions of the substance, pulling them out into solution. Which property of water accounts for this occurrence?.
When water dissolves a substance, weak charges on water molecules attract oppositely charged portion of the substance, pulling them out into the solution. The property of water that accounts for this occurrence is polarity.
We all know that water is a polar substance, but what does that mean? Whenever hydrogen atoms combine with other highly electronegative elements like fluorine, chlorine or oxygen. a partial positive charge forms on the hydrogen, while a partial negative charge forms on the electronegative element, making it a dipole. This is what makes water a polar substance.
When a substance, for example, table salt is added to a glass of water, the positive dipole (partial positive charge) in the hydrogen atoms attract the negatively charged chlorine ions in the salt, while the negative dipole in the oxygen atom attracts the positive sodium ions in the salt, pulling them into the solution. That is why, the salt crystals disappear a while after they were added into the glass of water.
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How is the mass number of an atom calculated? (1 point)
total number of electrons
electrons plus neutrons
total number of protons
protons plus neutrons
The mass number of atoms is calculated by adding the number of neutrons and protons.
The smallest piece of stuff that makes up an element is an atom. It consists of a nucleus with protons and neutrons and orbitals with a specific number of electrons surrounding it. One can identify and distinguish an element's atom from the others by knowing the nuclear makeup of a certain atom. In actuality, the periodic table was created expressly to organize the elements in terms of their atomic and mass numbers and nuclear compositions.
According to the periodic chart, an atom's nuclear composition is closely related to its atomic and mass number. The number of protons in the nucleus or the number of electrons around an atom determines its atomic number for neutral atoms. The amount of components inside the nucleus affects the mass number, meanwhile. The total number of protons and neutrons in the nucleus is used to calculate it. As an illustration, the mass number of the element helium is 4, as its atom has two protons and two neutrons in its nucleus.
Therefore, the correct option is (d).
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When heat is removed from a liquid,what is most likely to happen?
When heat is removed from water for example, it turns from a liquid to a gas.
The particles in water absorb this energy, giving them a higher energy level. The particles are able to change state when thermal energy is removed.
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A compound displays peaks at 1670, 2950 and 2220 cm-1 and has a m/z of 150. is the compound likely to be a, b or c?
your question is incomplete.
you haven't mentioned what is a, b and c.
Calculate the ph of the solution resulting from the addition of 25.0 ml of 0.20 m hcl to 50.0 ml of 0.10 m aniline (c6h5nh2). kb (c6h5nh2) = 3.8 x 10-10
-1.82 is the ph of the solution resulting from the addition of 25.0 ml of 0.20 m HCl to 50.0 ml of 0.10 m anilines (c6h5nh2). kb (c6h5nh2) = 3.8 x 10-10.
In chemistry, the pH scale is used to define the acidity or basicity of an aqueous solution. Historically, pH stood for "potential of hydrogen." The pH values of acidic solutions are typically lower than those of basic or alkaline solutions.
A negative pH is calculated when the molarity of hydrogen ions in a strong acid is more than 1 N, even though the pH scale generally ranges from 0 to 14. (Normality).
HCl reacts with aniline, thus:
C₆H₅NH₂ + HCl → C₆H₅NH₃⁺ + Cl⁻
Moles of HCl are:
0.025L × (0.20mol HCl / L) = 5.005 mol HCl
Moles of aniline are:
0.050L × (0.10mol HCl / L) = 0.005 mol aniline
Thus, after reaction, will remain:
5.005 mol - 0.005 mol = 5mol HCl
Moles of HCl in solution are equal to moles of H⁺, thus, moles of H⁺ are: 5 mol H⁺
As total volume is 25.0mL + 50.0mL = 75.0mL ≡ 0.075L
5 mol / 0.075L = 66.66 M
pH of solution = -log[H⁺]
pH = -log 66.66 M
pH = -1.82
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The synthesis of carbohydrates can be particularly difficult because of the large number of chiral centers and oh functional groups present. Epoxides can be useful synthetic intermediates in carbohydrate synthesis. Draw the product of the reaction of a phenyl gilman reagent with this epoxide.
Because of their many chiral centers and OH functional groups, carbohydrates can be extremely challenging to synthesize. In the production of carbohydrates, epoxides can be helpful synthetic intermediates. Take the outcome of the reaction between this epoxide and a phenyl Gilman reagent. To identify stereochemistry when it occurs, use the wedge/hash bond tools. Clearly identify the wedge or hash bonds that characterize the cis/trans stereochemistry of fused rings. • If enantiomers form, draw them both. The drop-down menu's + symbol can be used to divide up numerous goods. The typical formula for the Gilman reagent is R2CuLi, and it is a lithium and copper (diorganocopper) reagent. Alkyl or aryl groups make up R.
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A fission reaction takes place with a mass defect of 0.0060 kg. how much energy os produces?
5.4 × 10¹⁴ Jules of energy is produced.
Mass defect is the difference between the mass of a composite particle and the sum of the masses of its parts.
The mass defect can be explained using Albert Einstein's formula E = mc².
E is the energy in joules.
m is the mass defect in kilograms.
c is the velocity of light in metres per second (3.00 x 10⁸ m/s).
m = 0.0060 kg
E = 0.0060 kg × (3.00 x 10⁸ m/s)²
E = 5.4 × 10¹⁴ J
Average binding energy per nucleon equals total binding energy divided by mass number (sum of protons and neutrons in an atom).
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