The atomic radius becomes larger as move down the group or column in the periodic table because it increases the number of energy levels with each successive period.
As we move down the group, the number of period increases, which means the number of shells in an atom also increases. So, the extra electrons are added in the next shell with each successive period down the group, and the atomic size increases with an increase in atomic number down the group.
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at 1 atm pressure the heat of sublimation of gallium is 277 kj/mol and the heat of vaporization is 271 kj/mol. how much heat is required to melt 0.500 mol of gallium at 1.00 atm pressure?
At 1 atm pressure the heat of sublimation of gallium is 277 kJ/mol and the heat of vaporization is 271 kJ/mol. heat is required to melt 0.500 mol of gallium at 1.00 atm pressure is 3 kJ.
The data given as follows :
The heat of sublimation of gallium = 277 kJ/mol
The heat of vaporization = 271 kJ/mol
The difference between the heat of sublimation of gallium and the heat of vaporization is given as :
ΔH = heat of sublimation - heat of vaporization
ΔH = 277 kJ/mol - 271 kJ/mol
ΔH = 6 kJ/mol
The heat required = n ΔH
= 0.500 × 6
= 3 kJ
Thus, At 1 atm pressure the heat of sublimation of gallium is 277 kJ/mol and the heat of vaporization is 271 kJ/mol. heat is required to melt 0.500 mol of gallium at 1.00 atm pressure is 3 kJ.
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suppose that an atom has (i) 4, (ii) 5, electrons in different orbitals. what are the possible values of the total spin quantum number s? what is the multiplicity in each case?
The spin quantum number will be 2 and 2.5 and multiplicity in each case will be 5 and 6.
The angular momentum of such an electron is described by its spin quantum number (ms). An electron carries orbital angular momentum in addition to angular momentum around its axis of rotation. The Spin Quantum Number (s) really does have a magnitude (1/2) and a direction (+ or -) since angular momentum would be a vector.
(i) If an atom has 4 electrons then it will have total
Total spin quantum number = 1/2+1/2+1/2+1/2 = 4/2=2
Multiplicity = 2S+1= 2×2+1=5
(ii) If an atom has 5 electrons then it will have
Total spin quantum number = 1/2+1/2+1/2+1/2+1/2 = 5/2 = 2.5
Multiplicity = 2S+1= 2×2.5+1=6
Therefore, the spin quantum number will be 2 and 2.5
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a shorter, easier way to show chemical reactions, using symbols instead of words, is called a group of answer choices
A shorter, easier way to show chemical reactions, using symbols instead of words, is called a Chemical equation.
All the elements in chemistry have specific name and properties. Along with this, they all have a particular sign like Na for sodium, Ar for Argon and K for potassium.
Rather than writing the full name in words of the elements, we write only the symbols of the element along with the products and the reactants separated by using a arrow pointing towards products side.
For example,
Chemical reaction: Sodium hydroxide reacts with Hydrogen chloride to form Sodium chloride and water.
Chemical equation: NaOH + HCl → NaCl + H₂O.
So, as we can see from the example, the chemical equation is much more easier to understands and shorter.
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Glacier striations (scrapings) were found in the deserts of Africa. What did Wegener suggest about these deserts long ago?
Wegener suggested that the deserts of Africa were once covered in ice and that the striations were formed by the movement of the ice across the desert floor.
Glacier striations are grooves or scratches in the bedrock that have been created by a glacier sliding over the surface. They are typically found in areas where the ice has melted away, revealing the bedrock beneath.
Wegener suggested that the deserts were once wetter and lusher. He proposed that the climate has gradually changed over time, making the deserts arider. This is supported by evidence of ancient riverbeds and lakes in the Sahara Desert.
Glacier striations can be used to help researchers learn about the history of a particular glacier and the climate in the area where it is located. For example, the direction of the striations can indicate the direction the glacier was moving and the depth of the striations can give clues about how deep the glacier was.
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The electronic geometry of a carbon dioxide molecule would
be
a Linear
b T-shaped
c Trigonal bipyramidal
d Square pyramidal
Answer:
linear
Explanation:
carbon doixide is a nonpolar covalent bond since their polar charges repels each other at 180 degrees that is why its linear.
please rate it,thanks.
What is like the mitochondria?
O Excretory system
Digestive system
O Nervous system
O Skeletal System
Answer:
digestive system
.
Explanation:
if 243 mg of mg(oh) 2 was neutralized with 0.0500 m hcl, what volume of hcl would you need for the neutralization?
volume of HCl would you need for the neutralization is 4 ml .
What is neutralization reaction ?
In chemistry, neutralization or neutralization (see spelling difference) is a chemical reaction in which acids and bases react quantitatively with each other. When reacting in water, neutralization does not generate excess hydrogen or hydroxide ions in solution. The pH of the neutralized solution depends on the acidity of the reactants.
In the context of chemical reactions, the term neutralization is used for reactions between acids and bases or alkalis. Historically, this reaction was expressed as
Example:
HCl + NaOH → NaCl + H2O
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what is the anion of cobalt III sulfide
chemical formula:
Co2S3
The only ion that is seen to be a negative ion in cobalt III sulfide is the sulfide ion.
What is an anion?The term anion just means a negative ion. We know that when we have an ionic compound, the ionic compound would have a positive ion which would have a plus sign and a negative ion which would have a minus sign.
We have to look at the compound that is called cobalt sulfide. there are two ions here, the cobalt III ion and the sulfide ion. The cobalt III ion is positive while the sulfide ion is negative.
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How can science help places that are affected by natural disasters?
Answer:
The answer is sophisticated earthquake early-warning systems, increasingly accurate storm forecasting, and innovative flood risk and flood mitigation projects provide communities with the tools they need to respond to impending hazard events, and infrastructure design and engineering improvements help to reduce the damage suffered
Explanation:
I hope this helps
For small liquid spills that only affect a small area of skin, immediate flush with flowing cold water for at least.
For atleast 15 mins
Lab safety
We must always be cautious with hot and boiling liquids and whenever you are heating a liquid of any kind.We should never heat flammable liquid in a beaker. Never look down the neck of hot or heated vessel. Flasks, reaction containers and beakers should never be filled to capacity.For small liquid spill or splash that affects only a small area of skin, you should immediately flush skin with flowing water for at least 15 minutes (30 minutes for bases).
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which of the following are examples of relative dating methods? select one: a. all of the above. b. dendrochronology and seriation. c. seriation and fluorine, uranium, nitrogen dating. d. dendrochronology and the law of superposition.
Dendrochronology and seriation give the idea of the past events around us. Therefore, option B is the correct answer.
Dendrochronology is both an old and a modern science. Just counting tree rings sounds simple, but in the context of forest dynamics tree age is an important and valuable parameter.
Calculating the years of the formation of tree gives us the idea of how old and strong that particular tree is. It is important in case of geology.
For a long time, dendrochronology was associated with the dating of old houses, paintings, and archaeological samples. In recent decades however it has become a science with a broad range of applications such as global climate change, canopy process decline, the carbon cycle, and many others.
Seriation, also called artifact sequencing, is an early scientific method of relative dating, invented by the Egyptologist Sir William Flinders Petrie in the late 19th century
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2. when writing the chemical equation for a reaction, how do you indicate that a given reaction is dissolved in water? how do you indicate that a precipitate has formed as a result of the reaction?
When writing the chemical equation for a reaction, a reactant in aqueous solution is indicated with (aq); formation of a solid is indicated with (s).
Chemical equations serve to represent the transformation of reactants into products. For instance, the combination of iron (Fe) and sulphur (S) results in iron sulphide (FeS). The plus symbol indicates that sulphur and iron react to form FeS.
The four primary categories of chemical reactions are single displacement, double displacement, breakdown, and synthesis. But keep in mind that other people refer to these reactions by other names.
They are equations that represent chemical reactions using chemical formulae and symbols. In a chemical equation, the reactants are represented on the left and the products are on the right. A symbol that denotes the reaction's direction separates these two entities.
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Which of the following phrases describes the similarities between problem space theory and how the brain looks at problems
The phrases that describes the similarities between problem space theory and how the brain looks at problems is option C: They can occur quickly or slowly.
What does problem space theory entail?The category of problem-solving techniques used in social science includes the problem space theory. The problem space theory employs the strategy of characterizing the issue before seeking a resolution. The focus of a problem space is on the stages and objectives involved in solving a problem rather than providing details of a solution.
Note that Your heart rate increases as your brain releases a surge of adrenaline, causing you to become stiff and shake. Despite the absence of difficulties, the brain is programmed to find solutions. The brain invents a new problem to remedy when there is nothing to tackle.
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See full question below
Which of the following phrases describes the similarities between problem space theory and how the brain looks at problems?
They have only three steps.
They can only be used in a laboratory setting.
They can occur quickly or slowly.
They are biased against the scientific method.
100. grams of ammonia (nh3) is dissolved in a 8.3 l solution. what is the molarity of the resulting solution? report your answer with the correct number of significant figures.
The molarity of a resulting solution is 0.707 mol/L
The molarity of a solution is defined by the amount of solute in moles divided by the volumes of solution in litres.
1 grams of ammonia is equals to 0.05872 mol
100 grams of ammonia is equals to 5.872 mol
Molarity of a resulting solution would be = 100 gm of NH3 / 8.3 L of a solution.
That is 5.872 moles of NH3 / 8.3 of a solution.
Molarity of a resulting solution would be 0.707 mol/L of a solution.
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Why is it important to spray all samples with peroxide before spraying them with the indicator solutions?.
Peroxide is sprayed on all samples before any indicator so as to bleach the samples before staining by the indicators
peroxide is any of a class of chemicals in which 2 oxygen atoms are linked together by a single covalent bond peroxide is useful in bleaching as they are agents bleaching.
The peroxide when applied to the sample it reduces color bodies in pulp by oxidizing the carbonyl group making the samples colorless.
When the indicator is applied to a sample that is bleached the indicator penetrates this highlights important features of the tissue as well as enhances the tissue contrast.
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the kb for a weak base is 1.00 x 10-9. what is the % ionization of a 2.00 m aqueous solution of the base?
The % ionization of a 2.00 m aqueous solution of the base is 0.0022%
What is pOH ?
It is a measure of the hydroxide ion (OH-) concentration of a solution. Therefore, it can be used as an indicator of the alkalinity of a substance and, in some cases, also as an indicator of electrical conductivity. pOH is the negative logarithm of hydroxide ion content and is given by the formula:
pOH = 14 - pH
OH = Kw /OH+
where Kw = self-ionization content of water.
Applying the logarithm on both sides, the more general form of the equation is: In relation to corrosion, pOH can be used as an indicator of electrolyte conductivity in galvanic cells. The conductivity of a solution depends on the concentration of ions that act as charge carriers. The higher the concentration of OH ions, the stronger the alkalinity, the higher the conductivity of the electrolyte, and the higher the rate of galvanic corrosion.
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How many moles
moles are in 1850 grams of sucrose?
Answer:
grams Sucrose = 0.0029214440066693 mole using the molecular weight calculator and the molar mass of C12H22O11.
Answer: 5.41 moles
N=m/M
= 1850/12*12+22*1+16*11
N= 5.41 moles
how many grams of h2so4 must be dissolved in 1.08 l of solution to generate a solution with a concentration of 2.69 m
The mass of H₂SO₄ that must dissolved in 1.08 liters of solution to make 2.69M solution is 271.52 grams.
The molarity of the substance is defined as the number of moles of solute per unit volume of solution in liters.
In this case,
The volume of the solution is 1.08 L.
The required molarity of the substance is 2.69M.
So,
we can write,
Molarity = Moles/Volume
Moles = Molariyt x volume
Moles =2.69 x 1.03
Moles = 2.77
Moles = Mass required/molar mass.
Molar mass of H₂SO₄ is 98 g/mol.
Putting values,
2.77=Mass required/98
Mass required = 271.52 grams.
So, 271.52 grams of H₂SO₄ is required to make 2.69M solution.
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Question 8(Multiple Choice Worth 4 points)
(01.04 LC)
What best describes a material's ability to dissolve?
O Solubility
O Melting point
O Boiling point
O Thermal conductivity
Answer:
Solubility is the best to dissolve
what is the rate constant for the reaction? express your answer in liters per mole per minute to two significant figures.
The rate constant for the reaction is the relation between the concentration of the reactant and the chemical rate of reaction.
The rate constant of the chemical reaction is the proportionality constant that describes the relationship between the concentration of the reactants and the chemical rate of reaction. The symbol of rate constant is k. Rate is depends on the temperature. unit for the zero order reaction is : L⁻¹ s⁻¹. unit of rate constant for the first order reaction is : s⁻¹. unit for the rate constant for second order reaction is : mol⁻¹ L s⁻¹.
Thus, The rate constant for the reaction is the relation between the concentration of the reaction and the chemical rate of reaction.
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24 points
Which two particles have opposite charges?
O A. lons and neutrons
B. Electrons and protons
OC. Neutrons and protons
OD. Electrons and neutrons
Answer:B
Explanation: according to the law of electrostatics it states that "unlike charge attract each other and like charges repel each other ".
Hydrogen sulfide (H2S) is combined with zinc (Zn). The equation for the reaction is shown below.
H2S + Zn → H2 + ZnS
What happened during this reaction?
A zinc atom formed bonds with two hydrogen atoms.
A sulfur atom formed bonds with two hydrogen atoms.
A zinc atom formed a bond with one sulfur atom.
Bonds between a zinc atom and two hydrogen atoms were broken.
Bonds between a sulfur atom and two hydrogen atoms were broken.
The correct option are option C,E that is bonds between a sulfur atom and two hydrogen atoms were broken. Zinc atom formed a bond with one sulfur atom.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
In the give reaction, bonds between a sulfur atom and two hydrogen atoms were broken. zinc atom formed a bond with one sulfur atom.
Therefore, the correct option are option C,E.
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The dosage for penicillin for infants is 7.2mg per kg of body weight. Determine the dosage in grams. Please help!!
If you take 0.0072 grams, you should Penicillin dose for newborns is 7.2 mg per kilogram of body weight.
Why would someone use penicillin?Infections brought on by bacteria are treated with penicillins. By eradicating the germs or stopping their growth, they function. Penicillins are available in numerous varieties. Different infections are treated with each differently.
Does penicillin work on any bacteria?To treat staphylococcal and streptococcal bacterial infections, penicillin is a common antibiotic that is administered. Penicillin is a member of the antibiotic class known as beta-lactams, whose members all work by preventing the growth of bacterial cells, which eventually results in bacterial eradication.
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why does recovered singal have 3 or 4 volatge level instead of 2 levels as you would excpect for a digtal signal
The digital signal is a signal that encodes data as a series of discrete values; at any one moment, it can only take on a maximum of one of a finite set of values.
A digital signal, in contrast, represents continuous values; it always reflects a real number within a continuous range of values. Information is represented by simple digital signals in discrete analogue level bands. The same information state is represented by all levels in a band of values. The signal in the majority of digital circuits can have two legitimate possible values; this is known as a binary signal or logic signal.
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what salt water body does the water you use in your home travel to?
Other natural therapies, such as salt water, can help soothe a sore throat. Gargling with salt water works well to destroy bacteria, reduce discomfort, and loosen mucus.
What does "remedying a situation" mean?When you fix something that is broken or harmful, you enhance it. To correct the situation, a lot has been done inside. Synonyms include rectify, redress, and reform. More remedies' opposites.
Describe the four treatments.The four primary categories of judicial remedies are (1) damages, (2) restitution, (3) coercive remedies, and (4) declaratory remedies. These categories are organized according to their intended use. Damages are typically used as a remedy to make up for any harm that has been done to the affected party.
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How many ml of a 14.0 m nh3 stock solution are needed to prepare 200 ml of a 4.20 m dilute nh3 solution?
60 ml of a 14.0 M NH₃ stock solution are needed to prepare 200 mL of a 4.20 M dilute NH₃ solution.
Using the formula given below ,
M₁ x V₁ = M₂ x V₂
M₁ = concentration of stock solution
V₁ = volume of stock solution (to be found out)
M₂ = concentration of diluted solution
V₂ = volume of diluted solution;
V₁ = (M₂ x V₂) / M₁
= (4.2 x 200) / 14
= 60ml
Hence , 60 ml of a 14.0 Mole NH₃ stock solution are needed to prepare 200 mL of a 4.20 M dilute NH₃ solution.
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q12 (1pts) which one of the following molecules has an atom with an incomplete octet? a) nf3 b) h2o c) ascl3 d) geh4 e) bf3
The following molecules has an atom with an incomplete octet is BF₃.
the following molecules given as follows :
a) NF₃ - it follow the octet rule. all the atom present have there octet complete. the molecule is stable;
b) H2O - all the have complete octet.
c) AsCl₃ - all the atoms have 8 electron in valence shell and follow octet rule.
d) GeH₄ - thos molecule also follow the octet rule
e) BF₃ - not follow the octet and have incomplete octet. Boron atom have in complete octet.
thus, The following molecules has an atom with an incomplete octet is BF₃.
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1. What might cause cosmic radiation to be deflected around Earth?
Neurons that are rare, small, and lack features that distinguish dendrites from axons are called.
Answer:Anaxonic Neurons
Explanation:
I am working on a Bohr Rutherford Diagram for Science right now, and my first question on the textbook is "draw a Bhor Rutherford Diagram for Sulfur-32."
How do I figure out how many dots I put in the Diagram?
The number of dots in the Bohr Rutherford Diagram for sulphur-32 is equal to 16 as the dots represent the number of electrons and the sulfur atoms have 16 in its atom. Bohr Rutherford's Diagram of sulphur-32 is shown below.
What is Bohrs' model of an atom?Bohr's model described the atomic structure by explaining the electrons move in definite and fixed orbitals or electron shells. Boh's model proposed that atoms contain a nucleus and the electrons surround this atomic nucleus.
Each orbit has fixed energy and the energy levels are represented with integer 1, 2, 3,.... and sometimes also represented as K, L, M, N...... shells.
When the electron moves from a lower energy level to a higher energy level then it absorbs energy and when the electron falls from a higher energy level to a lower energy level then it emits energy.
The atomic number of the sulfur atom is 16 so it has 16 electrons. Therefore, we can show 16 dots surrounding the nucleus in the Bohr-Rutherford Diagram.
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