The pair of atoms in which the nuclei contain the same number of neutrons is Chlorine - 35 and Sulfur - 34
The nucleus of the atom is composed of protons and neutrons. The neutrons have no charge on them and is represented by the letter N. The difference between mass number of the atom and its atomic number would give the number of neutrons present in the nucleus of the atom.
The number of neutrons of the respective atoms are
(i) Calcium – 40 = 20 neutrons
Calcium – 42 = 22 neutrons
(ii) Chlorine – 35 = 18 neutrons
Sulfur – 34 = 18 neutrons
(iii) Bromine – 83 = 48 neutrons
Krypton – 83 = 47 neutrons
(iv) Iodine – 127 = 74 neutrons
Bromine – 80 = 45 neutrons
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14. On what substance might you find a plastic fingerprint? *
A.A bar of soap
B.On a door frame
C.A piece of paper
D.OA blood covered floor tile
Answer:
Soap
Explanation:
what is the role water plays in how macromolecules function in the body ?
how does water help macromolecules carry out their functions ?
Answer:
binomial
Explanation:
because the fact that macromolecules is carry out with functions constant-1,2,3,4 etc
Write a couple of sentences in you own words
Tell what group and period this element would be in from the picture below. 2pt
Describe how you determined it place using words like period, group, valence, energy shells 4pts
Determine what family it belongs to. 1pt
The picture shows the electronic configuration of Carbon which belongs to 14 group and 2nd period in the periodic table.
What do you mean by inert gas?A gas is said to be inert if it does not readily react chemically with other substances and does not afterwards produce chemical compounds. The noble gases, also known as the inert gases in the past, frequently do not react with numerous things.
In the figure there are 2 e in k shell 8 e in l shell and 2 e in last one. So total becomes 12 e. The Carbon contains 12 electron in shells , valence electrons are 2 electrons , group is 14 , period is 2 and family is Carbon family.
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a load of 30 - j 40 is connected to a source of 100 v with a phase angle of 30o , through a transmission line with an inductive reactance of 80 ohms. the total reactive power absorbed by the line is:
The total reactive power absorbed by the line is: 120-J 160 VA
Given that, a load of 30 - j 40 is connected to a source of 100 v with a phase angle of 30o , through a transmission line with an inductive reactance of 80 ohms.
[tex]current, $I=I_L=\frac{100 \angle 30^{\circ}}{30-j 40+j 80}=\frac{100 \angle 30^{\circ}}{30+j 40}$[/tex]
[tex]$=2 \angle-23.13^{\circ}$[/tex]
[tex]$\begin{aligned} V_L &=\left(100\left(30^{\circ}\right)-I(j 80)\right.\\ &=\left(100 < 30^{\circ}\right)-(2 L-23.13)(j 80) \\ &=100 L-76.26 \text { volts. } \end{aligned}$[/tex]
[tex]$\begin{aligned} \text { Power delivered toads }=& V_l I_L^* \\=&(100 < -76.26)(2 L-23.13)^* . \\=&(100 < -76.26)(1.839-j 0.786)^* \\ &=(100 < -76.26)(1.839+j 0.786) \\ &=(100 < -76.26)(2 L+23.13) \\ S &=120-j 160 \mathrm{VA} \end{aligned}$[/tex]
The component of complex power known as reactive power pertains to energy storage and retrieval rather than consumption. Real power, which really does work, and reactive power, which permits transformers to change, generators to produce, and motors to rotate, are the two types of power found in an AC power system.
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1. State the general period and group trends among
main-group elements with respect to each of the
following properties:
a. atomic radii
b. first ionization energy
c. electron affinity
d. ionic radii
e. electronegativity
2. a. In general, how do the periodic properties of
the d-block elements compare with those of
the main-group elements?
b. Explain the comparison made in (a).
3. For each main-group element, what is the
relationship between its group number and
the number of valence electrons that the group
members have?
Explanation:
ok so I believe:
a. increase in atomic radii going down a group and decrease going across a period.
b. increase in IE1 going across a period and up a group. the highest IE1 elements are like He, Ne, F and first ionization energy decreases moving further away from those elements moving south west on the periodic table.
c. electron affinity increases moving across a period left to right.
d. ionic radii increases going down a group and decreases going across a period left to right
e. electronegativity increases across a period but decreases down a group. (opposite for electropositivity)
what is meant by the d-block elements? are you referring to the spdf location?
All side lengths of ΔJKL equal 2 units. A transformation maps ΔJKL to ΔJ'K'L'. The length of side J'K' is 5 units. Is this a rigid transformation?
No, there is no one-to-one mapping of all the points of the pre-image to the image.
No, at least one segment length is not preserved, making this a nonrigid transformation.
Yes, the vertices of the pre-image map to the vertices of the image.
Yes, all of the side lengths of the pre-image are proportionate to the image.
No, at least one segment length is not preserved, making this a nonrigid transformation.
This transformation is nonrigid since it does not retain the length of at least one segment.
An isometry, often known as a rigid transformation of the plane, preserves length.
Reflections, translations, and rotations, are a combination of these three transformations and are all considered "rigid transformations".
The idea of a rigid transformation is that neither the size nor the shape is changed.
The second response, which results in a unit with a length of 5 units, is valid because segment JK's length of 2 units is not preserved when it is mapped onto segment J'K'.
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perfect gas is a hypothetical gas in which the volume of the individual atoms (molecules) is negligible compared to the total volume of the container.
Perfect gas is a hypothetical gas in which the volume of the individual atoms (molecules) is negligible compared to the total volume of the container is true.
For a gas to be ideal, it has to follow the following rules.
The volume of molecules of a Perfect gas also known as an ideal gas has to be almost negligible as compared to the volume of the container.
The molecules do not attract or repel each other. They hardly collide with other in an elastic collision. This elastic collision also happens with the wall of the container.
So according to the first rule, the volume of individual molecules is negligible as compared to the the total volume of the container.
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PLEASE HELP! DUE IN 3-5 MINUTES THANK YOU!!
The specimen at 100x zoom can be identified as an Animal cell as per the observations of it containing the cytoplasmic elements like the cytosol.
The contents of an animal cellOrganelles, cytoplasmic elements, the cytosol, and the cell membrane make up the normal structure of an animal cell.
Each of the cell's organelles is a membrane-bound structure with a specific function. Animal cells are the kind of typical eukaryotic cells because they have the presence of a membrane-bound nucleus and organelles and are encased in a plasma membrane.
Animal cells lack a cell wall, in contrast to eukaryotic cells found in plants and fungus. The building blocks of all living things in the kingdom Animalia are called animal cells.
They give bodies shape, take in nutrients to turn into energy, and aid in animal movement. They are also capable of self-replication and contain all an organism's genetic material.
The biggest organelle in animal cells is the nucleus. Cell activity is controlled by the nucleus. It also includes the chromosomes of the cell.
The genetic material (DNA) that makes you who you are is contained in the chromosomes.
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A sample of natural sulfur consists of three isotopes:
95.0% sulfur-32 (31.97 amu)
0.75% sulfur-33 (32.97 amu)
4.21% sulfur-34 (33.96 amu)
Based on this information, what is the average molar mass of sulfur?
Answer
A
31.92 g/mol
B
32.00 g/mol
C
32.80 g/mol
D
32.05 g/mol
Average molar mass of sulfur is 32.80 g/mol
The average atomic mass of a chemical element is calculated by taking into account the atomic masses of its naturally occurring isotopes and their respective abundances
Here given data is
95.0% sulfur= 32 (31.97 amu)
0.75% sulfur= 33 (32.97 amu)
4.21% sulfur= 34 (33.96 amu)
We have to find average molar mass of sulfur = ?
Average molar mass = ∑i × isotope of i × abundance of i
Average molar mass = 31.97×95.0 + 32.97 ×0.75 + 33.96×4.21
Average molar mass = 32.80 g/mol
Average molar mass of sulfur is 32.80 g/mol
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a 3.0-l sample of helium was placed in a container fitted with a porous membrane. half of the helium effused through the membrane in 13 hours. a 3.0-l sample of oxygen was placed in an identical container. how many hours will it take for half of the oxygen to effuse through the membrane?
The total time taken by half of the oxygen to effuse through the membrane is 68.18 hours.
The rate of effusion can be calculated by :
r = V/t
r = 1.5 L/24hr
r = 0.0626 L/hr
According to Graham's Law, effusion is inversely proportional to the square root of their molar mass.
[tex]\frac{r1}{r2}[/tex] = √[tex]\frac{M2}{M1}[/tex]
The molar mass of He is 4 g/mol and molar mass of O is 32 g/ mol.
Putting the values
0.0626 L/hr ÷ [tex]r_{2}[/tex] = √32/4
[tex]r_{2}[/tex] = 0.022 L/hr
Therefore, the time taken for effusion of half of 3 L that is 1.5 L of oxygen is:
Time = 1.5 L/ 0.022L/hr = 68.18 hours
Hence, the total time taken by half of the oxygen to effuse through the membrane is 68.18 hours.
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a heliox deep-sea diving mixture contains 2.0 g of oxygen to every 98.0 g of helium. what is the partial pressure of oxygen when this mixture is delivered at a total pressure of 8.2 atm ?
The partial pressure of oxygen when the mixture is delivered at pressure of 8.2 atm is 0.020 atm.
What is partial pressure?Each gas that makes up a mixture of gases has a partial pressure, which is the notional pressure of that gas as if it alone filled the original combination's complete volume at the same temperature.
The formula, which calculates partial pressure,
Total pressure = partial pressure Mole fraction
Mole proportion of oxygen in a mixture is equal to the sum of the moles of oxygen and helium.
109 grams are equal to one gigagram, or gg.
= 2 × 10⁹/32 /2 × 10⁹/32 + 98 × 10⁹ / 4
= 2.54 × 10⁻³
oxygen's partial pressure is equal to its mole fraction plus its overall pressure.
= 2.54 × 10⁻³ × 8.0 atm
= 0.02032 atm
= 0.020 atm
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the kitchen drain is blockrd witb grease. using your knowledfe of chemical reactions and transfer of enerhy, how can tou unpljg this drain without physically touching the blockage
Following are the methods to unplug this drain without physically touching the blockage.
1. Pour hot, boiled water down a drain.
If you choose to attempt to clear a grease blockage on your own and you are certain that your plumbing system is made up of metal pipes rather than plastic, you might try flushing it out with hot water. If your pipes are constructed of plastic, we wouldn't recommend trying this because you run the risk of melting or weakening the joints.
2. Hot water and vinegar
A 50:50 solution of hot, boiling water and vinegar performs similarly to the commercial chemical drain cleaner (and is just as effective). The advantage of a homemade vinegar and water solution is that it is non-toxic and substantially less corrosive than commercial drain cleaners. Grease that has accumulated on the inside walls of your pipes is dissolved by warm water and vinegar. Give yourself another dose a few minutes later if the first dose doesn't work.
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Atoms bond together using chemical bonds;
chemical bonds are stored energy that hold atoms
together within a molecule. Would chemical bonds
be considered a form of kinetic energy or potential
energy? Explain.
Answer:
potential energy
Explanation:
they only store energy, so they’re not using it which would be kinetic energy.
calculate the specific heat of a substance if it takes 6.7 j of energy to raise the temperature of 2.3 grams of the substance by 78°k
The specific heat is 0.00892181.
The specific heat capacity of a substance is the amount of heat required to raise the temperature of a unit amount of the substance by 1 degree. At the specific heat Cp of the substance, we name the amount of heat supplied Q that causes a temperature change for the weight W of the substance. Specific heat capacity is the amount of heat required to raise the temperature of 1 kg of a substance by 1 Kelvin.
Specific Heat Capacity C or S The amount of heat required to raise the temperature of a substance by 1 degree Celsius is called the specific heat capacity of the substance. Heat is often measured in joules J. The mass of the sample is denoted by m. The amount of heat is represented by Q. Heat is expressed in J or Joules. T is the temperature of the substance.
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an unknown compound containing tellurium and bromine is analyzed and it is determined that 28.53% of the compound by mass is composed of tellurium. what is the mass percent of br in the compound?
The mass percent of bromine in this tellurium and bromine compound is 71.47%.
If the compound is made up only of tellurium and bromine, then if the mass percent of tellurium is 28.53%, we can safely assume that the rest is bromine. So, we take the 100% and subtract the mass percent of tellurium to calculate the mass percent of bromine:
100% - 28.53% = 71.47%
The mass percentage of bromine in this compound is 71.47%.
We can even use this data and the molar masses of tellurium and bromine to calculate the empirical formula of the compound if needed.
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the specific rotation of a pure substance is 10degrees. a mixture of this substanc eand its enantiomer has an observed specific rotation of 2 degrees. what is the eprcentage of the excess steroisomer in the mixture
The percentage of the excess stereoisomer in the mixture c.25%.
Stereoisomerism, or spatial isomerism, is a form of isomerism wherein molecules have the same molecular components and series of bonded atoms, but fluctuate in the three-dimensional orientations of their atoms in space.
The observed rotation of the mixture is levorotary (terrible, counter-clockwise), and the precise rotation of the pure S enantiomer is given as dextrorotary (fantastic, clockwise), which means that the pure R enantiomer should be levorotary, and the mixture has to comprise extra of the R enantiomer than of the S enantiomer.
Enantiomers have the same chemical and bodily homes and are indistinguishable from every other except for the route of rotation of the plane of polarized mild. they're described as optically lively.
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Disclaimer:- your question is incomplete, please see below for the complete question.
the specific rotation of a pure substance is 10 degrees. a mixture of this substance and its enantiomer has an observed specific rotation of 2 degrees. what is the percentage of the excess stereoisomer in the mixture
a.50% b.75% c.25% d.0% e.80%
A seed-bearing plant starts its growth from?
A: An egg cell
B: A Sperm Cell
C: The Joining Of Egg And Sperm Cells
A seed-bearing plant starts its growth from the Joining Of Egg And Sperm Cells in order to form a zygote cell (Option C)
What is a zygote cell?A zygote cell is the first cell product of the process of fertilization, which involves the fusion of a sperm (in this case a pollen grain because we are talking about plants) and one egg cell.
Therefore, with this information, we can conclude that a zygote cell is generated by fertilization and it is the start of diploid life both in plants and animals.
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Q2. Calculate the number of moles of gas present in the following gases, at room
temperature and pressure, RTP, (20°C and atmospheric pressure). Assume molar
volume is 24dm³ or 24 000cm³.
a.
100cm³ of CO2
b. 200cm³ of H₂
150cm³ of ammonia, NH3
500cm³ of 0₂
200cm³ of methane, CH4
C.
d.
e.
f. 600cm³ of He
g. 2dm³ of N₂
ESO
Answer:
Calculate the number of moles of gas present in the following gases, at room
temperature and pressure, RTP, (20°C and atmospheric pressure).
If the volume of a sample of gas is doubled while holding the temperature of the gas constant, then the pressure of the gas is.
If the volume of a sample of gas is doubled while holding the temperature of the gas constant, then the pressure of the gas is half the initial pressure.
What is the effect of change in the volume of a gas at the constant temperature on the pressure of the gas?The relationship between the volume and pressure of a gas is given by Boyle's law of gases.
The equation of Boyle's law of gases is given as follows:
P₁V₁ = P₂V₂
Where;
P₁ is the initial pressureP₂ is the final pressureV₁ is the initial volumeV₂ is the final volumeSolving for the final pressure of the gas;
V₂ = 2 V₁
P₂ = P₁ * V₁ / 2 V₁
P₂ = P₁ / 2
Hence, the final pressure is half the initial pressure.
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Metallic aluminum reacts with MnO2 at elevated temperatures to form manganese metal and aluminum oxide. A mixture of the two reactants is 47.2% mass percent Al. Determine the theoretical yield (in gramsof manganese from the reaction of 250g of this mixture. Report to 3 significant figures .
To find the theoretical yield of the equation. First, identify the limiting reactant in a chemical equation.
Step 1: write out the equation and balance it.
Al+ 3mno2=3mn+ 2Alo3.
The limiting reactant is mn02 because it is not found in excess.
Step 2: convert the % to grams. All contain 47.2% mole and mno2 will be 100-47.2= 52.8
All=47.2÷100×250(total gram of the reactants)=118g
Mno2=52.8÷100×250g=132g.
Step 3:calculate the molar mass of mno2 and that of mn. The atomic mass of mn is 54.9380 and that of oxygen is 16.
Mno2=54.938+ (16)2=86.98g/mol.
Mn=54.938.
Step 4:
From your balanced equation, calculate mn.
132g mno2× (1mol mno2÷86.98(molar mass) of mno2×3 mol of mn/4molAl×54.938g of mn÷1mol of mn.
132g×1÷86.98g×3÷4×54.938÷1
=62.53g
What is the molar mass?
The molar mass of a chemical compound is defined in chemistry as the mass of a sample divided by the amount of substance, which is the number of moles in that sample, measured in moles. The molar mass of a substance is a bulk attribute, not a molecular property. The molar mass is an average of numerous instances of the compound, which often vary in mass due to isotopes present. The molar mass is most usually calculated from standard atomic weights and is thus a terrestrial average and a function of the relative abundance of the constituent atoms on Earth. For bulk quantities, the molar mass is ideal for converting between the mass of a substance and the amount of a substance.
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NASA communicates with the Space Shuttle and International Space Station using Ku-band microwave radio. Suppose NASA transmits a microwave signal to the Space Shuttle using radio waves with a frequency of 14 GHz. Calculate the wavelength of these radio waves.
Be sure your answer has the correct number of significant digits.
The wavelength of these radio waves with a frequency 14GHz is equal to 0.0214m.
What is microwave communication?Microwave transmission is the transmission of information by using electromagnetic waves within the frequencies 1GHz to 300GHz are called microwaves.
The transmission of signals either directly or via a satellite by sending microwaves. The receivers for microwave signals are disc-shaped antennae and are often seen installed in business locations or near private homes.
The relationship between frequency (ν) and wavelength (λ) can be expressed as follow:
λ = c/ν
Given, the frequency of the radiowaves = 14 GHz
Change the frequency into (per second) = 14 × 10⁹ s⁻¹
The wavelength of the radiowaves can be calculated from, λ = c/ν
where c = 3× 10⁸ m/s is the speed of light.
λ = c/ν = 3× 10⁸ m/s./ 14 × 10⁹ s⁻¹
λ = 0.0214 m
Therefore, the wavelength of these radio waves is equal to 0.0214m.
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Will HCl donate a proton and act as a base?
Will water accept a proton to form a conjugate base?
Will HCl donate a proton and act as an acid?
Will HCl accept the proton and act as an acid?
Will water accept a proton to form a conjugate acid?
Will HCl accept the proton and act as a base?
Will HCl donates a proton and acts as an acid? Option C
Will water accept a proton and act as a conjugate base? Option F.
HCl is a Bronsted-Lowry acid because it is a proton donor, and H2O is a proton acceptor and Bronsted-Lowry base. Acids lose electrons and bases gain electrons. Acids and bases that work together in this way are called conjugate pairs, consisting of conjugate acid and a conjugate base.
Here we can see that the hydrogen ion moves from the HCl molecule to the H2O molecule, forming chloride and hydronium ions. As a hydrogen ion donor HCl acts as a Brønsted-Lowry acid. As a hydrogen ion acceptor H2O is a Brønsted-Lowry base. Bronsted acids are proton donors and thus donate H+. In this case, HCl is an acid because it donates its H+ to NH3. Lewis acids are electron acceptors. Acids are substances that can donate H+ ions to bases.
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How many grams are there in 8.99x1024 atoms of carbon
The atomic weight of one carbon atom = 12 amu
Mass of 1 mole of carbon atoms = 1 × atomic weight of one carbon
= 12 gm
Since we already know that the atomic mass is specified for one mole of the atom, we may get the mass of one atom by dividing the mass by Avogadro's number.
The mass of one atom of carbon is = Atomic mass/Avogadro number
= 12g/6.022×10^23
= 126.022×10^−23g
= 1.9933×10^−23g
Hence, the mass of 1 carbon atom is 1.9933×10^−23grams
Now,
Mass of 8.99 x 10^24 atoms = (8.99 x 10^24) x (mass of 1 carbon atom)
⇒ Mass of 8.99 x 10^24 atoms = 8.99 x 10^24 x 1.9933×10^−23grams
⇒ Mass of 8.99 x 10^24 atoms = 17.919767 x 10
⇒ Mass of 8.99 x 10^24 atoms = 179.2 g (approx.)
What is Mole concept?A practical way to indicate the quantity of a substance is using the mole concept. The numerical value and the units in which the magnitude is represented can be used to decompose any measurement into two pieces.For instance, the magnitude and unit are "2" and "kilogram," respectively, when a ball's mass is determined to be 2 kilograms.One gram of a pure element is considered to possess a staggering number of atoms when discussing particles at the atomic (or molecular) level. The term "mole" is frequently used in this context. The unit called a "mole," which is a count of a huge number of particles.A mole is the measure of a substance that includes precisely 6.02214076 * 10^23 of the substance's "elementary entities," according to the science of chemistry.To learn more about Mole concept, refer to:
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A water treatment plant needs to maintain the ph of the water in the reservoir at a certain level. To monitor this, they take 2 oz. Of water at 37 locations every hour, measure the ph at each of those locations, and find their average. If the ph level of the reservoir is ok, the results at each location will have varying results, with an average ph of 8. 5 and a standard deviation of 0. 22. If the ph level of the reservoir is ok, what is the probability that the sample average is more than 8. 42?.
Explain the difference between an atom and an ion
Refer to attachment <(￣︶￣)↗
What part of an atom takes up all the volume or space
The cloud of electrons surrounding the nucleolus of an atom takes up all the volume or space.
What is an atom?The simplest unit of matter is the atom. As matter makes up everything in the universe (apart from energy), atoms are the building blocks of matter.
The protons, neutrons, and electrons that make up an atom are three different types of incredibly small particles known as subatomic particles. The nucleus of the atom, which is made up of protons and neutrons, is where all the action happens, and an electron cloud flies around it.
In contrast to the protons, which have a positive charge, electrons have a negative charge. Both protons and electrons are equal in number in a typical (neutral) atom. The quantity of neutrons is also usually the same, though not always.
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HELP ME 41 POINTS FR FR
If salinity does not change, how does seawater density change as temperature changes?
The density of water decreases as it becomes warmer, more space. When comparing two samples same salinity of water, sample with the higher temperature will have more volume and hence be less dense.
What causes the salinity?The accumulation of salt from rainfall over a long period of time or the weathering of rocks are two examples of natural processes that contribute to primary salinity.
How salinity is measured?By running an electric current between a salinity meter's two electrodes in a sample of soil or water, it is possible to determine the salinity of both water and soil. The quantity and make-up of dissolved salts affect the electrical conductivity, or EC, of a soil or water sample.
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A 224g sample of water cools down from 56°C to 20°C. The specific heat of water is 4.184 J/g°C. What amount of heat energy was lost?
When 224 g sample of water cools down from 56°C to 20°C with specific heat of water 4.184 J/g °C, the amount of heat energy lost is 33,739 J
Given that,
Mass (m) = 224 g
Specific heat (C) = 4.184 J/g ℃
Initial temperature = 56 ℃
Final temperature = 20 ℃
Heat energy = (mass) × (specific heat) × (change in temperature)
Q = m × C × ΔT
Q = 224 × 4.184 × (56 – 20)
Q = 224 × 4.184 × 36
Q = 33,739 J
Therefore, the heat energy that was lost in the process is 33,739 J
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Which letter(s) represent(s) a phase change occuring?
Answer:
A= solid
B= Melting and freezing
C= Liquid