The name of this element is gallium
Was the periodic table altered by Mendeleev?
The periodic table was created on February 17, 1869, by Russian chemist Dmitri Mendeleev. He wrote down the symbols for the chemical elements and arranged them according to their atomic weights.
A periodic table of elements is what Mendeleev referred to as. This is due to the fact that he organized the elements according to their atomic masses. He listed the elements in order of increasing atomic mass, with the lighter elements listed first.
During the classification, Mendeleev made predictions about several of the elements' yet-to-be-discovered properties. One of the elements he designated as eka-aluminum later turned out to be gallium.
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How do you write chemical symbols?
The initial letter of a chemical symbol is usually capitalized; the second letter is always written in lowercase. The first letter of chemical symbols that only contain one letter is always capitalized.
How should the chemical symbol be written properly?Chemical symbols are used to identify elements and can be one or two letters long. Examples are the chemical symbols O for oxygen, Zn for zinc, and Fe for iron. The first letter of a symbol is typically capitalized. A sign with two letters always has a lowercase letter as the second letter.
Which three guidelines apply when writing chemical symbols?The guidelines for drafting chemical formulas are as follows: When writing them, place the symbols with positive charge valency first. Second, note each atom's valency. over its symbol's top. Thirdly, discard the positive or negative radicle and divide the valency number by their highest common factor.
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Which of the following statements correctly describe the effect of molecular polarity on the behavior of a molecular compound?
a. The physical properties of a molecular compound are directly related to molecular polarity.
b. A polar compound will experience stronger intermolecular forces than a non polar compound.
The following statements correctly describe the effect of molecular polarity is a) The physical properties of a molecular compound are directly related to molecular polarity.
b) A polar compound will experience stronger intermolecular forces than a non polar compound.
The following statements correctly describe the effect of molecular polarity on the behavior of a molecular compound are :
a) The physical properties of the compounds is depends on the physical properties of the molecular compound such as the boiling point , the melting point , the solubility etc.
b) The polar compounds will have the stronger force of intermolecular attraction , the boiling point of the polar compound is high that's means it has strong intermolecular forces.
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What is the ratio of rms velocities of the molecules of two gases A and B?
The required ratio of rms velocities of the molecules of two gases A and B is 1:4.
What is Root mean square velocity of gas molecules?Root mean square (R.M.S.) speed of a gas is a square base of the normal of the square of speed. In that capacity, it has units of speed. R.M.S. = M3RT. where R = gas consistent, T = temperature (in K), M = molar mass of the gas.
According to question:
We have,
M1 = 16, M2 = 2, T1 = 200k, T2 = 400K
Vrms = root(3RT/M)
Here,
Va/Vb =[tex]\sqrt\frac{200*2}{16*400} }[/tex]
Va/Vb= 1:4
R is constant
Thus, Required ratio is 1:4
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Q. What is the ratio of rms velocities of the molecules of two gases A and B whose molecular weights are 400 and 200 gm/mol respectively?
Draw the 6 Newman projections of 2,2,5,5-tetramethylhexane of all the different energy levels. Label each as staggered or eclipsed and rank in order from lowest energy to highest
Here are the six Newman projections of 2,2,5,5-tetramethylhexane:
Lowest energy:
/C
/ \
/C C\
/ \ / \
C/ C \C
\ / \ /
\C C/
\ /
\C
This conformation is staggered.
/C
/ \
/C C\
/ \ / \
C/ H \C
\ / \ /
\C C/
\ /
\C
This conformation is eclipsed.
/C
/ \
/C C\
/ \ / \
C/ H \H
\ / \ /
\C C/
\ /
\C
This conformation is eclipsed.
/H
/ \
/C C\
/ \ / \
C/ H \C
\ / \ /
\C C/
\ /
\C
This conformation is eclipsed.
/H
/ \
/C C\
/ \ / \
C/ C \C
\ / \ /
\C C/
\ /
\H
This conformation is staggered.
Highest energy:
/H
/ \
/C C\
/ \ / \
H/ C \C
\ / \ /
\C C/
\ /
\H
This conformation is eclipsed.
In order from lowest energy to highest, the conformations are: 1, 5, 2, 4, 3, 6.
What are Newman's projections?The three-dimensional structure of a molecule may be better understood with the assistance of a graphic known as a Newman projection.
This projection stares down a carbon-carbon bond the majority of the time, making it a particularly effective approach to depict the stereochemistry of alkanes.
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The shielding effects help to explain:
why it is easier to take electrons from higher energy levels (these are larger atoms)
why it is easier to take electrons from smaller atoms
why it is harder to take electrons from higher energy levels (these are larger atoms)
The shielding effects help to explain why it is easier to take electrons from smaller atoms. Due to the fact that as the shielding effect increases, the ionization energy decreases.
what is shielding effects?
The shielding effect looks at how electrons closer to the nucleus tries to shield the electrons farther away from the positive charge of the nucleus which is the reduction in the effective nuclear charge on the electron cloud, as a result of difference in the attractive force.
what is electron shielding?
In a simple term Electron shielding is described as the blocking of valence shell electron attraction by the nucleus, which is as a result of the presence of inner-shell electrons.
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What is the relationship between the two structures shown? A. enantiomers B. diastereomers C. constitutional isomers D. identical Enter Your Answer: A DB oc OD
The relationship between the given structures is that they are enantiomers. Therefore, option A is correct.
What are enantiomers?In chemistry, an enantiomer also called an optical isomer is one of two stereoisomers that are non-superposable onto their own mirror image. Enantiomers are much like when looking at the same face one's right and left hands, they cannot be superposed with each other.
The asymmetric atom is a type of stereocenter that refers exclusively to a chirality center. Compounds that consist of one of the asymmetric atoms are always chiral.
No amount of reorientation will allow the 4 unique groups on the chiral carbon. The number of stereoisomers has can be determined by the number of chiral carbons in it. Stereoisomers have types both enantiomers and diastereomers.
Diastereomers share the same molecular formula as enantiomers and are non-superposable however, they do not mirror images of each other.
A chiral molecule rotates plane-polarized light. A mixture of equal amounts of each enantiomer, a racemic mixture does not rotate the light.
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In the structure of 4-isopropyl-2,4,5-trimethylheptane, identify the primary, secondary, and tertiary hydrogens.
Answer:
The classifications of the carbon as primary secondary tertiary and quaternary depends on the number of the carbon atoms attached to a carbon. In case, the carbon is attached to a single carbon, then it is referred as primary carbon. If the carbon is attached to two carbons, then it is referred as the secondary carbon, if the carbon is attached to three carbons then it is referred as tertiary, and if the carbon forms all the bond with another carbon atom then it is referred as quatenary carbon.
The given below is the picture showing the primary, secondary, tertiary, and quarternary carbons in 4-isopropyl-2,4,5-trimethylheptane:
Explanation:
What are scope 4 carbon emissions?
The emission of carbon that are avoided are called scope 4 Carbon emission.
The scope for Carbon emissions are those emissions of carbon which are reduced or avoided.
They can also be defined as the reductions that have occurred outside of a products complete cycle or the value chain.
The product cycle are those which are related to the manufacturing cycle of the carbon related products.
Collectively all the greenhouse emissions that are avoided or which are reduced to a very significant level are known as scope 4 emissions.
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how do the physical and chemical properties of an element change when they are used to make a compound
A compound is formed while atoms of or extra physical bond collectively chemically changes. For example, desk salt is a chemical compound that effects while atoms of Sodium (Na) bond with atoms of chlorine (Cl).
The residences of an detail do alternate while that detail combines with different factors to shape compounds. There are handiest 118 recognized factors which integrate to make the entirety withinside the universe. If you consider that, you will see that the residences of the detail have to alternate relying upon the compound it's far in.
For example, water is a compound crafted from the factors hydrogen and oxygen. Sugar is likewise a chemical compound which incorporates hydrogen and oxygen, in addition to carbon. The residences of the hydrogen atoms are one of a kind while they're a part of a sugar molecule than while they're a part of a water molecule.
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According to periodic trends, which element would have more valence electrons than oxygen?.
Correct answer is :- Chlorine (Cl) element have more valence electrons than oxygen
The s and p electrons in the outermost shell are valence electrons. Core electrons are those found in the inner shell.
Valence electrons are minuscule subatomic particles that we come across as we examine and investigate an element's atom. We can trace the valence electrons and forecast the sorts of bonds with the aid of Lewis structures.
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What is the freezing point of the solution when 60 g of water is mixed with 12 grams of glucose?
The freezing point of the solution when 60 g of water is mixed with 12 g of glucose is -0.47°C. This temperature is determined by a colligative property known as freezing-point depression.
What is freezing point?The freezing point is the temperature at which a liquid turns into a solid. When a liquid is cooled to its freezing point, the molecules of the liquid slow down and become more organized, forming a solid crystal lattice structure. The freezing point of a particular substance is determined by its chemical structure and is usually a few degrees lower than its melting point. Water, for example, freezes at 0 degrees Celsius (32 degrees Fahrenheit).
This property states that when a solute is dissolved in a solvent, the freezing point of the solvent decreases. Therefore, adding the glucose to the water will lower its freezing point.
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calcium nitrate and ammonium fluoride react to form calcium fluoride, dinitrogen monoxide, and water vapor. what mass of each substance is present after 13.36 g of calcium nitrate and 13.92 g of ammonium fluoride react completely?
The mass of each substances are Calcium nitrate = 0.08146 mole, Ammonium fluoride = 0.37 mole , Calcium fluoride = 6.3538 g, Dinitrogen monoxide=7.16848 g and Water= 5.86512 g
Ca(NO3)2 + 2 NH4F → CaF2 + 2 N2O + 4 H2O.
1. convert the given reactant mass into moles.
Calcium nitrate : 13.36/164=0.08146 mole
Ammonium Fluoride : 13.92/37 = 0.37 mole
One mole of Ca(NO3)2 completely reacts with 2 moles of
Ammonium Fluoride = 2 x 0.08146 =0.16292.
mole of NH4F reacts completely with calcium nitrate .
Ammonium Fluoride left = 0.37 - 0.16292 = 0.20708 mole
= 0.20708x 37 = 7.66 g is left.
Calcium nitrate is the limiting reagent:
Amount of CaF2 formed = 0.08146 mole * 78 = 6.3538 g.
(since one mole of Calcium nitrate gives one mole of CaF2).
Amount of dinitrogen monoxide formed = 0.08146x2x44= 7.16848 g
Amount of water formed =0.08146x4x18= 5.86512 g.
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which statement is not true about ionic bonds
Ionic bonds do not follow the rule that an ion has the same number of electrons as a nonionic atom of the same element.
Chemical bonds known as ionic bonds produce two ions with opposing charges. The entire transfer of valence electrons between atoms is referred to be this bonding. A molecule or compound is created when two atoms combine through a chemical link. Furthermore, they are connected by this relationship. The fact that this link can be ionic or covalent is most notable. Ionic bonds also involve the donation of an electron from one atom to another for stability. In covalent connections, however, the electrons and the atoms are shared. Between a metal and a non-metal, an ionic connection develops in which the non-metal draws the electron from the other atom.
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Mass of a MgCO3 molecule in kg? (1.00 amu = 1.66 x 10^(-24) g)
To find the mass of a MgCO3 molecule in kilograms, you can first determine the molar mass of MgCO3 in grams/mol, and then divide that value by the conversion factor between grams and kilograms.
The molar mass of a substance is the mass of one mole of that substance, and it is typically expressed in grams/mol. The molar mass of MgCO3 is 84.311 g/mol. This can be calculated by adding up the atomic weights of the individual elements in the molecule:
Mg: 24.305 g/mol
C: 12.01 g/mol
O: 16.00 g/mol
Total: 52.315 g/mol
To find the mass of one MgCO3 molecule in kilograms, you can divide the molar mass of MgCO3 (84.311 g/mol) by the conversion factor between grams and kilograms, which is 1000 g/kg. This gives you a mass of 0.08431 kg/mol for MgCO3.
To find the mass of a single MgCO3 molecule in kilograms, you would need to divide this value by Avogadro's number, which is the number of atoms or molecules in one mole of a substance. Avogadro's number is 6.022 x 10^23 atoms/mol or molecules/mol.
So the mass of a single MgCO3 molecule in kilograms would be:
(0.08431 kg/mol) / (6.022 x 10^23 molecules/mol) = 1.40 x 10^(-25) kg
I hope this helps! Let me know if you have any questions.
Choose the best Lewis structure for SF_4. Choose the best Lewis structure for CH_2Cl_2.
The best Lewis structure for SF₄ is option A. Choose the best Lewis structure for CH₂Cl₂ is B. T structure attached bellow.
The chemical SF₄ stands for sulfur tetraflouride. It contains 34 valence electrons in total and a formal charge of 0.
The molecule has a trigonal bipyramidal electron geometry since the core element is sulfur in an sp³d hybridization state. It has a see-saw chemical shape because it is a molecule of sort AX₄E.
The graphic affixed to this response depicts the molecule's structure.
In the Lewis structure of CH₂Cl₂, eight electrons are shared. The C atom shares two electrons with each of the H and Cl atoms.
Your question is incomplete but most probably your full question was attached below
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2. Which of the following is not a characteristic of carbon that allows for the great variety of
organic compounds?
Carbon is able to form single, double, and triple bonds.
Carbon is able to form strong bonds with other carbon atoms.
Carbon possesses four valence electrons.
Carbon has a larger atomic radius than other Group 14 elements.
rhon ond
Answer:d
Explanation:
d
Where are the valence electrons of neon?
Answer:
Neon Z=10
Explanation:
Neon has eight valence electrons, this closed she'll configuration makes neon supremely difficult to oxidized and difficult to reduce
1. what is galena chemical formula
Question 2 Draw The Major Product Of The Elimination Reaction Shown.
An elimination reaction can have two products major and minor which are shown in the attached diagram below.
What is an elimination reaction?An elimination reaction can be described as a type of organic reaction in which two substituents are eliminated from a molecule in either a one- or two-step mechanism.
The one-step mechanism is called the E₂ reaction, and the two-step mechanism is called the E₁ reaction. The kinetics of the reaction: E₂ is bimolecular or second-order while E₁ is a unimolecular or first-order reaction.
In cases where the molecule is capable to stabilize an anion but has a poor leaving group, a third type of reaction, E₁-CB.
The E₂ mechanism involves a one-step mechanism in which carbon-hydrogen and carbon-halogen bonds break to prepare a double bond.
E₁ stands for unimolecular elimination where the carbon-halogen bond breaks to give a carbocation intermediate and then deprotonation of the carbocation.
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How do the energy and the most probable location of an electron in the third energy level of an atom compare to the energy and the most probable location of an electron in the first energy level of the same atom?.
Answer: In the third shell, an electron has more energy and is farther from the nucleus.
Explanation:
two identical, side-by-side springs with spring constant 280 n/m support a 3.00 kg hanging box.
The stretch in each spring is 0.0525 m.
Each spring's spring constant: k=280 N/m
The box's mass: m = 3.00 kg
The weight of a box can be calculated by multiplying it's own mass by gravity's acceleration: (g = 9.8 m/s^2)
The weight of the box is:
[tex]F_{g} = mg = (3 kg) (9.8 m/s^{2}) = 29.4 N[/tex]
Because they are identical, each spring will facilitate half of the weight of a box, so:
[tex]F_{\frac{1}{2}} = \frac{29.4 N}{2} = 14.7 N[/tex]
So every spring would then obey Hooke's law, that also gives the spring's extension distance, Δx
based on the spring constant (k) and the force (F) applied to the spring, the equation is : Δx = F/k
Δx = 14.7 N/280 N/m
⇒ = 0.0525 m
As a result, the stretch either in spring is = 0.0525 m.
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What will happen if there is a greater concentration of H+ in the intermembrane space of the mitochondria?
The greater concentration of H+ in the intermembrane space of the mitochondria more will be the more ATP production by ATP synthetase.
The high external H+ ions concentration influences concentration within intermembrane space, which increases the amount of ATP produced by ATP synthase. The functioning of ATP synthase solely depend on the gradient of H+ ion concenteration. This gradient must have a high concentration in the intermembrane space and a low concentration in the matrix. H+ cannot flow through the outer membrane of the mitochondria but can do so through the inner membrane. By putting mitochondria in a low pH buffer, an H+ gradient is created, which ATP synthase can use to synthesize ATP.
Hence, movement of H + across ATP synthase generates ATP.
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What is the percent composition of a compound formed when 4.96 g of bromine combines with lithium to form 5.39 g of lithium bromide?
The mass of lithium required to react with 4.96 g of bromine is 0.372 g. The number of moles of each reactant is 0.062. Therefore the percentage composition of each element in the product is 50%.
What is percentage composition?The percentage composition of a compound is the weight percentage of each element present in the compound contributing to the total weight of the compound.
The reaction between lithium and bromine gas is given below:
[tex]\rm Br_{2} + 2 Li \rightarrow 2LiBr[/tex]
As per this reaction one mole bromine gas reacts with 2 moles of Li.
mass of Br₂ = 160 g/mol
mass of Li = 6 g/mol
for 2 Li = 12 g/mol
160 g of Br reacts with 12 g of Li. Thus, mass of Li required by 4.96 g of bromine gas is:
4.96 × 12 / 160 = 0.372 g.
The number of moles of Br = 4.96/ 80 = 0.062
no. of moles of Li = 0.372 / 6 = 0.062
The number of moles of each element is equal and hence, the percentage composition is 50 % each of Li and Br.
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Bromine makes up 92.1% of the compound, while the remaining 7.9% is made up of lithium.
What is percent composition?Percent composition is a way of expressing the proportion of each element in a compound as a percentage of the total weight of the compound.
To find the percent composition of an element in a compound, divide the weight of the element in the compound by the total weight of the compound, and then multiply by 100%.
In this case, the weight of bromine in the compound is 4.96 g, and the total weight of the compound is 5.39 g. Therefore, the percent composition of bromine in the compound is:
[tex](4.96 g / 5.39 g) * 100% = 92.1%[/tex]
This means that bromine makes up 92.1% of the compound, while the remaining 7.9% is made up of lithium.
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What kind of software is available for assessing the carbon footprint?
There are several types of software available for assessing the carbon footprint of a company, organization, or individual. These tools can help users track their GHG emissions and set reduction targets.
Carbon footprint calculators: These tools allow users to estimate their GHG emissions by entering information about their energy use, transportation, waste, and other relevant factors. Some calculators are specific to a particular sector or industry, while others are more general.Carbon accounting software: This type of software helps users track their GHG emissions over time and set reduction targets. It may include features such as data management, reporting, and verification.Life cycle assessment (LCA) software: LCA software is used to assess the environmental impacts of a product or service from raw material extraction to disposal. It can be used to quantify GHG emissions at different stages of a product's life cycle.Supply chain software: This type of software is used to track the environmental impacts of a company's supply chain, including GHG emissions. It may include features such as data management, reporting, and supplier assessment.Learn more about carbon footprint here:
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what are the disadvantages of using ionic compounds and covalent compounds in domestic?
Answer:
There are several disadvantages of using ionic compounds and covalent compounds in domestic settings:
> Ionic compounds are generally less stable and less resistant to changes in temperature and humidity than covalent compounds. This means that they may degrade or decompose over time, leading to reduced effectiveness or even hazards.
> Ionic compounds often have a high melting point and boiling point, making them difficult to handle and store. They may also be sensitive to heat, light, or moisture, which can affect their stability and performance.
> Ionic compounds can be corrosive and toxic, making them potentially harmful to humans and animals. Some ionic compounds, such as bleach and ammonia, can cause respiratory issues and skin irritation.
> Covalent compounds can be expensive to manufacture, as they often require specialized equipment and high temperatures and pressures to synthesize. This can make them less cost-effective for domestic use.
> Covalent compounds may also have a low melting point and boiling point, making them prone to decomposition or evaporation. They may also be flammable or explosive, posing a risk of fire or explosion in domestic settings.
Overall, it is important to carefully consider the properties and potential risks of using ionic and covalent compounds in domestic settings, and to follow safety guidelines and instructions for handling and storing these substances.
three equal-sized containers are filled with gases at stp. which container holds the greatest number of molecules?
All the three gases holds equal number of molecules as the size of the containers is equal.
The number of molecules is the product of moles to the Avogadro's number i.e., 6.022*10^23. The size of the containers in which the gases are filled is the same. Since, mole of all gases are equal at STP. Thus, all gases (O2, CO2 and Ne) has the same number of molecules. It is referred to as a mole since it shows the number of particles such as atoms and molecules that are present per mole of a given compound or substance.
Thus, all the three gases holds equal number of molecules as the size of the containers is equal.
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a liquid is in equilibrium with its vapor. if some of the vapor is allowed to escape, what effect, if any, is there on the condensation or vaporization rate?
When some of the vapor is allowed to escape, the pressure of the vapor will decrease, resulting in a decrease in the rate of condensation.
This is because the vapor pressure is directly proportional to the rate of condensation. Since the pressure of the vapor is lower, it is less likely for the molecules to collide and condense.
Furthermore, the rate of vaporization will increase since the pressure inside the container is lower. This is because when the pressure is lower, the molecules require less energy to escape the liquid, thus increasing the rate of vaporization.
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The condensation rate will initially be higher than the vaporization rate.
When a liquid is in equilibrium with its vapor and some of the vapor is allowed to escape, the condensation rate will initially be higher than the vaporization rate. This is because the vapor pressure in the system has decreased due to the escape of some vapor.
To re-establish equilibrium, the liquid will increase its vaporization rate to produce more vapor. As the vaporization rate increases, it will eventually match the condensation rate again, and the system will return to equilibrium. So, initially, there is an effect on the condensation and vaporization rates, but the system will adjust to restore the equilibrium between the two rates.
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An action potential is self-
Answer:
Action potentials are self-regenerating
Kinetic energy can come from other sources of energy. True False
Answer:
True
Explanation:
Sources include renewable energy sources such as the sun, wind, water, and geothermal heat. However, we also use artificial sources generated by humans, such as walking, vehicle motion, and system vibration.
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Which of the representative elements tend to form positive ions which tend to form negative ions?
The elements tend to form positive ions which tend to form negative ions is known as a metal.
Metals as we know are the most common elements that produce positive ions. This is because of a metals' low electronegativity. Positive ions can be formed by nonmetals as well, but this is no very common they generally form negative ions known as anions.
Metals are reactive in nature and tends to gain stability be reacting with other elements and losing electrons to form cations.
The reactivity series of metals is a series using which we can see which metal has the highest and which metal has the lowest reactivity.
The given question is incomplete I have answered it as per my general knowledge.
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