Helium- 2
Aluminum- 3
Fluorine- 7
Sodium- 1
Hope I helped.
The correct match of each element with its valence electron is as follows:
Helium: 2 (option B). Aluminum: 3 (option C).Fluorine: 7 (option D).Sodium: 1 (option A). What is valence electron?Valence electron is any of the electrons in the outermost shell of an atom capable of forming bonds with other atoms.
The number of valence electrons possessed by the atoms of an element determines the chemical reactivity of such element and it's groups on the periodic table.
According to this question, the appropriate valence electron has been assigned to each element based on their group on the periodic table.
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what are the limitations of the Klmn electronic configuration style of writing
In the KLMN electronic configuration style of writing K denotes the first shell which can hold up to two electrons, L denotes the second shell which can hold up to eight (2 + 6) or 8 electrons, M denotes the third shell which can hold up to eight (2 + 6 + 10) or 18 electrons etc.
The KLMN style of writing only indicates the number of electrons in each principal quantum number, however the spdf electronic configuration style of writing subdivides each shell into its subshells.
For instance the 3rd principal quantum number has s,p and d subshells, wherein s, p and d orbitals can have a maximum of 2, 6 and 10 electrons respectively.
WILL GIVE BRAINIEST
Listed in the Item Bank are some important labels for sections of the image below. To find out more information about labels, some have more details available when you click on them. Drag and drop each label to the corresponding area it identifies in the image.
Word Bank:
Alkali Metals
Alkaline Earth Metals
Metalloid
Metals
Noble Gas
Nonmetal
Transition Metals
Explanation:
Elements of group 1 represented in the blue column are alkali metals.
Elements of group 2 represented in the peach column are alkaline earth metals.
Elements from scandium to zinc or all the elements represented in the green columns are transition metals.
Elements in coral pink boxes represent metalloids, that is, they show properties of both metals and non-metals.
Elements present in blue, peach, green and coral pink boxes are all metals.
Whereas elements present in pink, that is, group 18 are all noble gases.
And elements present in yellow boxes are all non-metals.
What happened to the moon and earth if the sun did not exist
Anything in orbit around the Sun is basically moving fast enough to be in a constant state of freefall towards it. If the planets, for example, suddenly stopped moving they would immediately be pulled towards the Sun and fall into it.
HELP PLEASE !!!!!!!!!!!
Select the electron domain geometry that results in a bent molecular shape. Check all of the boxes that apply.
linear with two atoms and zero lone pairs
trigonal planar with three atoms and zero lone pairs
trigonal planar with two atoms and one lone pair
tetrahedral with three atoms and one lone pair
tetrahedral with two atoms and two lone pairs
Answer:
D
Explanation:
Edge trust me
The electron domain geometries that result in a bent molecular shape are:
Trigonal Planar with two atoms and one lone pairTetrahedral with two atoms and two lone pairsWhat is a bent molecular shape?A bent molecular shape occurs when there are two bonded atoms and one or more lone pairs around the central atom.
A common example of a molecule with a bent shape is water. In a water molecule, the central oxygen atom is bonded to two hydrogen atoms and has two lone pairs of electrons, resulting in a bent molecular shape with a bond angle of approximately 104.5 degrees.
Thus, the shapes are;
Trigonal Planar with two atoms and one lone pair
Tetrahedral with two atoms and two lone pairs.
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How many moles are there in 24.0 grams of FeF3
Hey there!:
Molar mass FeF3 = 112.84 g/mol
Number of moles = mass of solute / molar mass
Number of moles = 24.0 / 112.84
Number of moles = 0.212 moles of FeF3
Hope that helps!
How many moles of Boron (B) are in 5.03 x 1024 B atoms?
Hey there!:
Number of moles = ( number of atoms / 6.023*10²³ atoms )
given number of atoms = 5.03*10²⁴
Therefore:
Number of moles B = 5.03*10²⁴ / 6.023*10²³
Number of moles B = 8.35 moles
Hope that helps!
you rent a car in Germany with a gas mileage rating of 12.8km/L. What is its rating in miles per gallon?
so one liter is about 2. something gallons so at 12.8 km/l you would get about 30 mpg which is insane but yeah
Answer: The mileage rating of the car is 30.05 miles per gallon
Explanation:
We are given:
Mileage rating = 12.8 km/L
To convert this level into milligrams per deciliters, we use the conversion factor:
1 mile = 1.61 km
1 gallon = 3.78 L
Converting the above rating into miles per gallon, we get:
[tex]\Rightarrow (\frac{12.8km}{L})\times (\frac{1mile}{1.61km})\times (\frac{3.78L}{1 gallon})\\\\\Rightarrow 30.05miles/gallon[/tex]
Hence, the mileage rating of the car is 30.05 miles per gallon
Please help so I can study I am also giving brainest anwer
What happens when metals and nonmetals react?
No electrons are shared or move.
Electrons move from the metals to the nonmetals.
Electrons move from the nonmetals to the metals.
Electrons are shared equally.
B. Electrons move from metals from nonmetals creating ionic compounds.
Which examples demonstrate responses to stimuli? Check all that apply.
A. A Venus flytrap closes on a fly.
B. Large amounts of bacteria are present in a soil sample.
C. A plant grows toward the sunlight.
D. A rabbit has both white and black fur.
E. Bright lights cause a baby to blink.
Answer:
A.C. and E.
Explanation:
i just got it right so that's it.
can you tell me what tosay
Well if the candle lost half of its mass, and they are asking where the other half went. Most likely it is still hardened wax because the it says that you're candle lost half of its mass that means half is gone and the other half is still there. The chemical change would be liquid, and the chemical property would be Wax Vapour that is what i found.
-Hope it helps, if it does not help sorry.
A gas at constant volume has a pressure of 4.50 atm at 200. K. What will be the pressure of the gas at 250. K?
The Ideal Gas Law allows us to assume that at constant volume the variation in pressure is proportional to the variation in temperature.
Hence,
[tex]\frac{P1}{T1} = \frac{P2}{T2}\\ \\
\frac{4.50}{200} =\frac{P2}{250} \\ \\
P2 = \frac{4.50 * 250}{200}\\ \\
P2 = 5.63 atm[/tex]
Using Gay-Lussac's Law, we get [tex]P_2[/tex] [tex]5.625 atm[/tex] at [tex]250 K[/tex].
To find the new pressure of a gas at constant volume when the temperature changes, we use Gay-Lussac's Law, which states that pressure is directly proportional to temperature for a given mass of gas at constant volume. The formula for Gay-Lussac's Law is:
[tex]\frac{P_1}{T_1} = \frac{P_2}{T_2}[/tex]
Where:
[tex]P_1[/tex] is the initial pressure[tex]T_1[/tex] is the initial temperature[tex]P_2[/tex] is the final pressure[tex]T_2[/tex] is the final temperatureGiven:
[tex]P_1 = 4.50 \, \text{atm}[/tex]
[tex]T_1 = 200 \, \text{K}[/tex]
[tex]T_2 = 250 \, \text{K}[/tex]
Rearrange the formula to solve for [tex]P_2[/tex]:[tex]P_2 = P_1 \times \frac{T_2}{T_1}[/tex]
Substitute the known values:[tex]P_2 = 4.50 \, \text{atm} \times \frac{250 \, \text{K}}{200 \, \text{K}}[/tex]
Calculate:[tex]P_2 = 4.50 \, \text{atm} \times 1.25 \\ \implies P_2= 5.625 \, \text{atm}[/tex]
The new pressure of the gas at [tex]250 K[/tex] will be [tex]5.625 atm[/tex].
How many moles of ammonia, NH3, can be made from 7.5 moles of H2? N2 + 3H2 → 2NH3 A. 15 moles B. 22 moles C. 5 moles
The reaction will produce C. 5 mol NH₃.
N₂ + 3H₂ ⟶ 2NH₃
Moles of NH₃= 7.5 mol H₂ × (2 mol NH₃/3 mol H₂) = 5 mol NH₃
5 moles of ammonia, [tex]NH_3[/tex], can be made from 7.5 moles of [tex]H_2[/tex].
What is a mole?The mole is an SI unit used to measure the amount of any substance. The abbreviation for a mole is mol. One mole is exactly 6.02214076×[tex]10^{23}[/tex] particles.
Given data:
Moles of H₂ react = 7.5 mol
Moles of NH₃ formed =?
Chemical equation:
N₂ + 3H₂ → 2NH₃
Now we will compare the moles of ammonia with hydrogen.
H₂ : NH₃
3 : 2
7.5 : [tex]\frac{2 X 7.5}{3}[/tex] = 5
Hence, 5 moles of ammonia would be formed from 7.5 moles of hydrogen.
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Arrange the molecules in order from strongest intermolecular force to weakest.
-C2H6
-C4H10
-CH4
-C3H8
Answer:- [tex]C_4H_1_0>C_3H_8>C_2H_6>CH_4[/tex]
Explanations:- Alkanes are non polar molecules as these only have carbons and hydrogens. Electron negativity difference of C and H is very low and it makes them non polar. These have weaker London dispersion forces.
The forces of attraction becomes stronger in alkanes as the number of carbon increases because the surface area as well as molecular weight of the alkanes increases with an increase in number of carbons.
Butane has four carbons, propane has three carbons, ethane has two and methane has only one carbon, So, the strongest to weakest order of inter molecular forces is butane > propane > ethane > methane .
Answer:
The answer is C4H10-C3H8-C2H6-CH4
Explanation:
100% CORRECT
The molecule CCl4 contains one double bond and three single bonds.
Answer is: false, carbon tetrachloride contains four single bonds.
Carbon tetrachloride or tetrachloromethane (CCl₄) is an organic nonpolar compound.
Electron configuration of carbon atom: ₆C 1s² 2s² 2p².
Electron configuration of chlorine atom: ₁₇Cl 1s² 2s² 2p⁶ 3s² 3p⁵.
Chlorine atoms have one unpaired electron, carbon atom is sp3 hybridized (has four unpaired electrons).
False, The molecule CCl4 contains only four single bonds.
Explanation:There are only four single covalent bonds in CCl4. One carbon atom makes 4 covelent bonds with 4 chlorine atoms.Most of the mass of an atom is contained in its _____. A. electrons B. protons C. nucleus D. neutrons
What is the geocentric model? What is the heliocentric model? What observations and questions were asked that the geocentric model could not explain? Why is the heliocentric model not correct? What parts of the geocentric model were incorporated into the heliocentric model? What are the two main factors that affect gravity’s influence? What is Newton’s law of universal gravitation? The three things to remember about gravitational forces in space are: 1. 2. 3.
Answer:
1. A model in the universe in which the sun, moon, stars, and planets all revolve around Earth.
2. Why did stars and planets get brighter at different times of the year if they were all moving in perfect circles around the earth? Why do some planets seem to stop and reverse direction in the sky?
3. Not all astronomical bodies revolve around Earth. Only the moon orbits earth, but that's all. In fact, Earth revolves around the sun just like all the other planets.
4. The parts about the planets revolving around something and the fact that they revolve.
5. Mass and distance.
6. The law of universal gravitation states that every mass attracts other masses with a force that is directly proportional to the product of the two masses and is inversely proportional to the square of the distance separating them.
7.
1. All objects with mass (no matter how small) exert a gravitational attraction.
2. The more massive an object is, the stronger its gravitational force.
3. The greater the distance between the objects, the weaker the gravitational force.
Explanation:
Select the correct answer. A sealed bottle is full of air. The volume of the bottle is decreased, but the temperature remains constant. What other change occurs in the bottle? A. The air pressure will increase. B. The air pressure will decrease. C. The number of air molecules will increase. D. The number of air molecules will decrease.
Answer:
The air pressure will increase
Explanation:
The bottle is sealed, therefor the number of molecules can't change. The air inside the bottle may be considered as an ideal gas, and these have a particular set of laws they must obey.
In this case the law that apllies is Boyle's Law, which states that at a constant temperature, the pressure P of a gas varies inversely with its volume V, or P.V = k, where k is a constant.
If the volume is decreasing, the pressure must increase.
PLEASE PICK ONE THE SECOND IMAGE IS AN EXAMPLE! XD
IS THE LAST IMAGE CORRECT
which two elements are most likely to form an ionic bond? krypton and lithium, magnesium and silicon, calcium and potassium, iodine and chlorine
Which activity best demonstrates Ernest Rutherford’s creativity?
with his well-known gold foil experiment in which he demonstrated that the atom has a tiny and heavy nucleus.
Ernest Rutherford's most creative activity was his gold foil experiment conducted in 1909. This experiment demonstrated the structure of an atom, challenging existing models and earning Rutherford the title of 'father of nuclear physics'.
Explanation:The activity that best demonstrates New Zealand physicist Ernest Rutherford's creativity is his gold foil experiment conducted in 1909. In this groundbreaking experiment, Rutherford and his colleagues bombarded a thin sheet of gold foil with a beam of high-energy alpha particles obtained from radioactive decay of radium. He then observed the subsequent velocities and trajectories of the particles, a method that led to revelations about the nuclear structure of the atom.
Rutherford's experimental design illuminated the small and dense nature of atomic nuclei. Rutherford placed a radioactive source in a lead container, producing a beam of alpha particles that struck a thin gold foil. The scattering of the alpha particles, observed by the glow they caused when they hit a phosphorescent screen, challenged existing beliefs about atomic structure. His seminal experiments with nuclear radiation and atomic structure earned him the title of "father of nuclear physics" and helped him win a Nobel Prize in Chemistry in 1908.
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Nancy wants to find out how the steepness of a hill's slope affects the amount of soil that erodes from it. She has soil, a long pan, and a pile of books with which to build a model hillside. She has a watering can to model rainfall. In her experiment, which of the following factors should Nancy make sure that she does not change?
As from the given information Nancy's aim is to find the steepness of a hill's slope which will affect the amount of soil that erode from the surface so, the variable that should not be changed in this experiment should be the height of the long pan. The height of the long pan is made using the blocks of books on which the end of the pan is balanced. This should remain uniform and constant throughout the experiment so that other variables of the experiment can be altered and the results can be verified accordingly.
Answer:the amount of water she pours on the model
Explanation:
If the frequency of an FM wave is 8.85 × 107 hertz, what is the period of the FM wave?
Answer: The period of the FM wave [tex]1.1299\times 10^{-8} seconds[/tex].
Explanation:
Frequency of the wave = [tex]8.85\times 10^{7} Hertz[/tex]
Frequency is inverse of time period that is :
[tex]Frequency=\frac{1}{\text{Time period}}[/tex]
[tex]\text{time period}=\frac{1}{frequency}[/tex]
[tex]=\frac{1}{8.85\times 10^{7} Hertz}=0.11299\times 10^{-7} seconds=1.1299\times 10^{-8} seconds[/tex]
The period of the FM wave [tex]1.1299\times 10^{-8} seconds[/tex].
What is the theoretical yield of Li3N in grams when 12.8 g of Li is heated with 34.9 g of N2?
Answer:- 21.4 grams of [tex]Li_3N[/tex] are formed.
Solution:- The balanced equation is:
[tex]6Li+N_2\rightarrow 2Li_3N[/tex]
From this equation, lithium and nitrogen reacts in 6:1 mol ratio. Limiting reactant gives the theoretical yield of the product. We will calculate the grams of the product for the given grams of both the reactants and see which one of them gives the limited amount of the product. This limited amount of the product will be the theoretical yield.
The molar mass of Li is 6.94 gram per mol and for [tex]N_2[/tex] It is 28.02 gram per mol. The molar mass of [tex]Li_3N[/tex] is 34.83 gram per mol. The calculations for the grams of the product for given grams of both the reactants are shown below:
[tex]12.8gLi(\frac{1molLi}{6.94gLi})(\frac{2molLi_3N}{6molLi})(\frac{34.83gLi_3N}{1molLi_3N})[/tex]
= [tex]21.4gLi_3N[/tex]
[tex]34.9gN_2(\frac{1molN_2}{28.02gN_2})(\frac{2molLi_3N}{1molN_2})(\frac{34.83gLi_3N}{1molLi_3N})[/tex]
= [tex]86.8gLi_3N[/tex]
From above calculations, Li gives least amount of the product. So, 21.4 g of [tex]Li_3N[/tex] are formed.
The theoretical yield of Li3N is 21.58 grams when 12.8 grams of Li is heated with 34.9 grams of N2. This is determined by first identifying the limiting reactant through mol calculations and then using the balanced chemical equation to calculate the theoretical yield.
Explanation:To find the theoretical yield of Li3N, we first need to determine which is the limiting reactant. The balanced chemical equation is: 6Li + N2 -> 2Li3N.
From the periodic table, we find that the molar mass of Li is about 6.94 g/mol, and that of N2 is about 28.01 g/mol. Therefore, we have:
12.8 g Li *(1 mol Li / 6.94 g Li) = 1.845 g Li is approximately 1.85 mol Li34.9 g N2 * (1 mol N2 / 28.01 g N2) = 1.25 mol N2According to the balanced chemical equation, 6 moles of Li react with 1 mole of N2 to produce 2 moles of Li3N. Thus, the actual amount of Li can react with 1.85 / 6 = 0.3 mol N2, which is less than the existing amount of N2. Therefore, Li is the limiting reactant.
According to the reaction equation, 6 mol Li reacts to generate 2 mol Li3N, then 1.85 mol Li will generate 1.85 *(2 / 6) = 0.62 mol Li3N. Given that the molar mass of Li3N is about 34.83 g/mol, the theoretical yield is 0.62 * 34.83 = 21.58 g Li3N. Therefore, the theoretical yield of Li3N is 21.58 grams when 12.8 grams of Li is heated with 34.9 grams of N2.
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Round off the measurement 0.0070857 m to three significant figures
Jena's blueberry-pineapple smoothie measured 200g and was contained in 300ml. What is it's density?
The density of Jena’s smoothie is 0.667 g/mL.
Mass = 200 g
Volume = 300 mL
Density = mass/volume = 200 g/300 mL = 0.667 g/mL
Answer:
rounded it is 0.67 g/ml
Explanation: i took the test it was a bit confusing but i figured it out
If an decrease in temperature accompanies a reaction, what occurred?
I think the correct answer from the choices listed above would be the last option. If a decrease in temperature accompanies a reaction, then energy was absorbed which means that the reaction is endothermic. Hope this answers the question. Have a nice day.
Answer:
It should be endothermic reaction.
Explanation:
Because it absorbs more energy than release it.
I took the test before.
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Compare the type of bonds in metalloids to metal (delocalized) and nonmetal (localized).
1) The type of bond in metalloids to metal is metallic bond.
Metallic bond is a type of chemical bond.
Metallic bond is formed between electrons and positively charged metal ions.
Metallic radius is defined as one-half of the distance between the two adjacent metal ions.
Metallic bond increace electrical and thermal conductivity.
Metals conduct heat, because when free moving electrons gain energy (heat) they vibrate more quickly and can move around.
2) The type of bond in nonmetal is covalent bond.
Nonmetals have low electrical and thermal conductivity.
Which of the following is plotted on the y-axis of a distance versus time graph? A.Distance B.Time C.Slope. D.Velocity
Hello,
Question - Which of the following is plotted on the y-axis of a distance versus time graph?
Answer - A. Distance
Why - The reason its distance is because the fact that distance is a dependant variable and always will remian on the y axis.
What is the formula for water
Formula for water? There is no formula, but there is a symbol, if that's what you meant. The symbol for water is H2O. It means 2 Hydrogen molecules, because the symbol is H. And the O stands for Oxygen. So it meands two hydrogen molecules bonded with one oxygen molecule. Hope I helped :)
Answer:
Explanation:
what do you mean do you mean H2O
Significant figures communicate the level of precision in measurements
You are right! That is true.