Answer:
Because they have complete electronic configuration
Explanation:
Group 18 elements are known as the noble or inert gases. The elements in this group are non-reactive because they have complete electronic shell configuration.
Electronegativity is the tendency of an atom to attract electrons. The reason why atoms attracts electrons is to have a stable configuration like those of the noble gases. Since the noble gases do not require any extra-electrons to attain stability, they have 0 electronegative values.3. As a ray of white light passes through a prism, dispersion occurs. Which among the color of
the visible spectrum refracted the MOST?
C. Green
A. Yellow
B. Red
D. Violet
Your answer is option b
i.e. Red
because refractive index of red is more as compared to green, yellow and violet...
What is the concentration of hplus ions at a ph=11
Answer: 10^-11
Explanation:
to find the concentration of H+ ions given the ph, we use the formula 10^(-pH).
so 10^-11
Drag each phrase to indicate which flood mitigation technique it describes.(2 points)
floodplain management stormwater management elevated structures
reduces water runoff into streets, lawns, and other sitesprotects buildings in low-lying areas prone to floodsraises structures above flood levelenhanced by the addition of urban green spacesused mainly on the coast
Highlight
The phrase to indicate the flood mitigation technique it describes are:
Floodplain management – protects buildings in low-lying areas
stormwater management – reduces water runoff into streets, lawns, and other sites, and enhanced by the addition of urban green spaces.
Elevated structures-used mainly on the coast, raises structures above flood level.
What is flood mitigation?Flood mitigation is the control and management of movement of the blood water.
It includes flood gates and flood walls which manage the water of flood and prevent it from destroying building and homes.
There are different types of flood mitigation techniques for different areas.
Thus, Floodplain management – protects buildings in low-lying areas
stormwater management – reduces water runoff into streets, lawns, and other sites, and enhanced by the addition of urban green spaces.
Elevated structures-used mainly on the coast, raises structures above flood level.
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Flood mitigation manages and controls the flood water by removing inhabitants from the area. Floodplain management protects buildings.
What is flood mitigation?A flood mitigation is the control and management of the flood water by floodgates and floodwalls to prevent and protect the buildings and people.
The floodplain management of the mitigation technique involves the protection of low-lying buildings, stormwater management controls the flow of the floodwater flow in the streets and elevated structures are used in coastal regions to raise the level of the floodwater.
Therefore, different flood mitigation techniques are used to control and manage flood water.
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which of the following lists show the elements in order, from those having the least protons to those having the most protons in the atoms?
A. K, Mg, N, O
B. C, Al, P, Cl
C. Li, Be, H, He
D. Na, Ne, He, H
The elements that have least protons to those having the most protons in the atoms are:
B. C, Al, P, Cl
Protons in an atom:There is an equal number of protons and electrons in an atom. So when moving across a period in a periodic table the number of electrons increases which also shows the increases in a number of protons. So as the atomic number increases, the number of protons and electrons also increases.
Thus, the order of elements having least to greatest protons are:
C, Al, P, Cl
C has 6 atomic number, Aluminium has 13 atomic number , Phosphorus has 14 atomic number and atomic number of chlorine is 17.
Thus, option B is correct.
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How many hydrogen atoms are there in the molecule H2SO?
A. 1
B. 3
C. 4
D.2
please help, brainliest to the first person who is correct , i’ll give another 25 points if this is right
Answer:
D:2
Explanation:
H is hydrogen, and the subscript represents the amount of atoms it has so H2SO is two hydrogens
Answer:
D. 2 I think, not 100% sure.
PLS PLS HELP
this is science
Answer:
its minerals :)
Explanation:
i hope its right
alsooo heyyyy
Answer:
minerals!!!!! i think anyway
Explanation:
Question 1 of 10
Which describes the law of conservation of matter?
O A. The reactants must have more atoms than the products.
B. The reactants must have fewer atoms than the products.
C. Atoms change into other elements during a reaction.
D. The same atoms must be in the products and the reactants.
SUBMIT
FIRST PERSON GETS BRAINLIEST IF RIGHT
Answer:
I think is D. The same atoms must be in the products and the reactants.
Explanation:
Explanation:
DThe same atoms must be in the products and the reactants.
HELP ME PLEASE!! If given a graduated cylinder, a beaker with alcohol and a scale, explain the steps to find the mass of 40 mL of alcohol.
In general, some people equate mass and weight.
Mass is one of the principal quantities, which is related to the matter , whereas weight is a force that leads to the center of the earth (Earth's gravitational force)
Steps that can be taken to find the mass :
1. Weigh graduated cylinder (empty) 2. Pour the alcohol in the beaker into the graduated cylinder to the level of 40 ml 3. Weigh again graduated cylinder + poured alcohol 4. mass of alcohol 40 ml = mass in 3rd step - mass in the first stepA student would like to test the effect of eating a lot of candy on
student hyperactivity. She sets up two groups for her experiment and
measures her results in the number of times a student jumps out of their
seat. What is the independent variable?
Answer:
Number of candies
Explanation:
The independent variable in this experiment is the number of candies eaten by the student.
An independent variable is best pictured as the cause in an experiment. It is the reason why the effects in experiments are produced.
In this experiment, the hyperactivity is the hyperactivity is the dependent variable. It is the effect that is produced in this set up.
Answer:
Just to make it short, its eating a lot of candy
Explanation:
3. What crime had James Kater been convicted of in 1969?
A. Sexual assault of a 15-year-old girl.
B. Theft of a 1976 Opel model green car.
C. Abduction and assault of a 13-year-old girl,
D. Second degree murder of a 18 year-old female.
Read this excerpt from Eleanor Roosevelt’s "What I Hope to Leave Behind."
As I see it we can have no new deal until great groups of people, particularly the women, are willing to have a revolution in thought; are willing to look ahead . . . are willing to give up constant competition.
By repeating the phrase “are willing” three times, Roosevelt creates a tone of
politeness.
firmness.
triumph.
cooperation.
Answer:
triumph
Explanation:
Because women had been fighting so much that she feels triumphant that they will succeed and they are willing to continue until they reach success
Answer:
triumph
Explanation:
i got it right
ClO3− Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons. Show the formal charges of all nonhydrogen atoms, or use square brackets to denote the overall charge. View Available Hint(s)
Answer:
See explanation
Explanation:
The overall charge on ClO3− is shown on the image attached to this answer. If we calculate the formal charges on each atom in the structure, we will notice that one oxygen atom has a formal charge of -1 while all other atoms have a formal charge of zero.
This gives the compound an overall charge of -1 as shown in the image attached to this answer. This is the correct Lewis structure for the compound ClO3− .
The molecule has a formal charge of -1 on all oxygen atoms, and +2 on the Cl atom.
When all the electrons of an atom are shared equally, the charge attained by the atom is known as a formal charge.
The formal charge can be calculated as:
Formal charge = valence electron - non-bonding electron - [tex]\rm \dfrac{bonding\;electron}{2}[/tex]
In the molecule, the formal charge of Oxygen = -1.
In the molecule, the formal charge of Chlorine = +2
The oxygen atom has 8 electrons, in which 2 are shared in the bond formation, and 6 electrons are valence electrons.
The chlorine atom has 7 valence electrons in which 6 electron pairs are shared with the oxygen atom, and 1 lone pair has been available with Cl.
The structure of [tex]\rm ClO_3^-[/tex] molecule has been given in the image attached. The image shows the available lone pairs and the bonding in the structure.
Thus, the molecule has a formal charge of -1 on all oxygen atoms, and +2 on the Cl atom.
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At which temperature and pressure would a sample of helium behave most like an ideal gas?
1
75 K and 500 kPa
2
150. Kand 500 kPa
3
300. Kand 50 kPa
4
600. K and 50 kPa
Submit Answer
Answer: 600K and 50kPa
Explanation:
600k as well as 50kPa since the pressure seems to be the lowest as well as the temperature is the greatest throughout this situation.
Under high temperatures and low pressures, actual gases behaved like ideal gases. such as the rule
[tex]PV=nRT[/tex]Even though at high temperatures, the kinetic energy of such gas particles surpasses the intermolecular attractive forces, — in other words this same potential energy of something like the molecules (gaseous).
Thus the above answer i.e., "option 4" is right.
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what is the ionic compound formula sodium nitride?
Answer:
In ionic compounds, the charges of constituent ions must balance. This can be achieved by having three sodium ions per nitride ion. Therefore, the formula of sodium nitride is Na3N
Explanation:
Answer:
the charges of constituent ions must balance. This can be achieved by having three sodium ions per nitride ion. Therefore, the formula of sodium nitride is Na3N
Explanation:
You observe 2 waves named alpha and beta. The alpha wave has a frequency of 5 Hz and the beta wave has a frequency of 2 Hz. Based on these observations which wave has a shorter wavelength? Group of answer choices
Answer:
shorter wavelength = alpha wave
Explanation:
Given that,
The alpha wave has a frequency of 5 Hz and the beta wave has a frequency of 2 Hz.
We need to compare the wavelengths of these two waves.
For alpha wave,
[tex]\lambda_1=\dfrac{c}{f_1}\\\\\lambda_1=\dfrac{3\times 10^8}{5}\\\\=6\times 10^7\ m[/tex]
For beta wave,
[tex]\lambda_2=\dfrac{c}{f_2}\\\\\lambda_2=\dfrac{3\times 10^8}{2}\\\\=15\times 10^7\ m[/tex]
From the above calculations, we find that the wavelength of the alpha wave is shorter than the wavelength of the beta wave.
Which property do metalloids share with nonmetals?
Answer:
Both can react to form acidic compunds. Both are brittle.
Explanation:
Two sphericle objects have masses of 8000 KG and 1500 KG their centers are separated by a distance of 1.5 M find the gravitational attraction between them
if I am correct I think its I'm am not 100 percent sure but I think this should be the answer
The gravitational force of attraction between them is 3.56 * 10⁻⁴ N
Using the formula of gravitational attraction
F = G*M1M2/d²
where G = 6.67 * 10⁻¹¹ Nm²Kg⁻²
M1 = 8000Kg
M2 = 1500 Kg
F = 6.67 * 10⁻¹¹ * 8000 * 1500 / (1.5)²
F = 3.56 * 10⁻⁴ N
The gravitational force of attraction between them is 3.56 * 10⁻⁴ N
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What is it called when scientists in the same or similar field of study judge the quality of a fellow scientist’s scientific claim?
What is the energy of a photon with a frequency of 3.2 x 10 -2 Hz?
Answer:
E = 21.22 ×10⁻³⁶ J
Explanation:
Given data:
Energy of photon = ?
Frequency of photon = 3.2×10⁻² Hz
Solution:
Formula:
E = hf
h = 6.63×10⁻³⁴ Js
Now we will put the values in formula.
E = 6.63×10⁻³⁴ Js × 3.2×10⁻² Hz
E = 21.22 ×10⁻³⁶ J (Hz= s⁻¹)
Help me please guys :)
Explanation:
1. Methane
2. Diamond
3. not sure : )
:answer question number 2
Explanation:
this question was answered in a couple weeks with the same question I did u do not want me and my dad did it all over and u just said it is not going well and you don't want me and my mom and dad don't mind if I can come up to the mall and pick them out on my own and I can come
what should the charge be for calcium and fluoride ions?
What would be a reasonable pH level of the dish soap in your kitchen?
Answer:around 7
If your dish soap is labeled mild, gentle, or great for hands, chances are its pH level is somewhere right around 7. This mildness makes dish soap perfect for day to day cleaning. Most surfaces won't be damaged by dish soap, and there are a lot of places it can be used besides in the kitchen sink
Explanation: I have had this question before
Answer:
7
Explanation:
Considering that you use dish soap on a daily occurence... it is best for it to be versatile. By making it 7... it is very neutral.
This means it's not too acidic for some situations... nor is it too basic in other situations.
The graph shows a car's velocity over time. Velocity versus Time 60 40 Velocity, in mph forward 30 20 10 4 1 2 3 5 G Time, in seconds (s) What is the car's acceleration from 0 to 1 second? A. 8 mph/s B. 60 mph/s C. 10 mph/s D. 20 mph/s
The car acceleration form 0 to 1 will be 20 mph/s.
What is acceleration?The rate at which an object's velocity changes with respect to time is called acceleration. Accelerations are measured in terms of vectors. The orientation of the force is acting on an item determines the orientation of its acceleration. Acceleration can be calculated by using this formula:
a = v-u/ΔT.
where, a = acceleration, v = final velocity, u = initial velocity and T is temperature.
Calculation of acceleration.
It is given that v = 20 , u = 0,
ΔT can be calculated as,
[tex]=T_{2} - T_{1} \\= 2-1\\ = 1[/tex]
Now , put the values given data in acceleration formula
a = 20-0/ 1
= 20 mph/ s.
Therefore, acceleration of car will be 20 mph/s.
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#SPJ2
B. Drinking water can only be obtained
hom seawater by hallaka True. I False
Answer:
False
Explanation:
Please help me and I’ll give you brainiest!!!!!!!!!
Have a wonderful day!!:)))
Answer:
Explanation:
C
Different elements are most likely to react in similar ways when they
Answer:
Belong to the same group.
Explanation:
Different elements are most likely to react in similar ways when they belong to the same group.
This is because the elements in the same group always have similar number of valence electrons which implies that they all have the same number of electrons in their outermost shell. For example,barium (Ba), beryllium (Be), calcium (Ca), magnesium (Mg), radium (Ra), strontium (Sr) all have 2 electrons in their outermost shell and thus they belong to group 2 of elements which are known as Alkaline earth metals and they all tend to react in the same manner with other substances
The elements that has been belonging to the same group have been able to react in similar ways.
The reactivity of the elements has been based on the presence of the valence electrons. The elements that has been belonging to the same group have consisted of the same number of valence electrons with the increase in the number of shells moving from left to right.
Thus, the elements that have been belonging to the same group have consisted of the same reactive properties.
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Is it possible to view atoms?
Select one:
a. Yes, you can view atoms with the naked eye.
b. Yes, you can view atoms with a light microscope.
c. Yes, you can view atoms with a scanning tunneling microscope.
d. No, it is not possible to view atoms with any kind of microscope.
Answer:
I think it
C
because you cant view them with a naked eye
A 2.00 L pocket of air at sea level has a pressure of 99.9 atm. What is the
pressure if the pocket of air rises and expands to 8.0 L? *
0.04 atm
O
400 atm
25 atm
52 atm
Answer:
The answer is 25 atmExplanation:
The new pressure can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we are finding the new pressure
[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]
From the question we have
[tex]P_2 = \frac{2 \times 99.9}{8} = \frac{199.8}{8} \\ = 24.975[/tex]
We have the final answer as
25 atmHope this helps you
Answer:
25 atm
Explanation:
Hope I helped
Help plzzzz urgent !!!!!!!!!!!!!!
Answer: B < C < A
Explanation:
Ok so things that have the lowest pka are the strongest acids. the higher the pka the less acidic it is.