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Among the given elements the one which gains two electrons to fill outermost energy level is selenium. Selenium contains six electrons in its valence shell.

Selenium is 34th element in periodic table. It is classified  into the 16th group. 16th group is oxygen family and the group members are oxygen , sulfur, selenium, tellurium and polonium.

The number of valence electrons of the 16th group elements is 6. Thus according to octet rule they need two more electron to attain stability. They form covalent compounds by sharing their two electrons.

Magnesium loses two electrons to attain octet and fluorine needs oe and lithium loses one electron to be stable. Hence, the element among the given list which gains two electrons to fill its outermost energy level is selenium (Se).

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Answer:

Answers below!

Explanation:

11. F

12. T

13. T

14. F

15. T

16. T

17. F

18. F

19. T

20. F

21. PC

22. CC

23. PC

24. CC

25. CC

Answer:

Sorry I'm not sure on questions 11-20 but I thought I'd answer a few since you need the answers.

21. PC

22. CC

23. PC

24. CC

25. CC

Explanation:

21 is a PC because the pencil is not changing it's form. 22 is a CC because when you're frying an egg the egg goes through a chemical change and changes form. 23 is a PC because the paper isn't being chemically changed. 24 is a CC because the ingredients in the cake and the cake itself is going through a chemical change. 25 is a CC because anything with fire is a chemical change, it is forming a new substance, and it's producing heat.

The theoretical yield of AlI₃ obtained from the reaction is 121 g

We'll begin by calculating the mass of I₂ that reacted and the mass of AlI₃ produced from the balanced equation. This can be obtained as follow:

Molar mas of I₂ = 2 × 127 = 254 g/mol

Mass of I₂ from the balanced equation = 3 × 254 = 762 g

Molar mass of AlI₃ = 27 + (3 × 127) = 408 g/mol

Mass of AlI₃ from the balanced equation = 2 × 408 = 816 g

SUMMARY

From the balanced equation above,

762 g of I₂ reacted to produce 816 g of AlI₃

From the balanced equation above,

,762 g of I₂ reacted to produce 816 g of AlI₃

Therefore,

113 g of I₂ will react to produce = (113 × 816)/762 = 121 g of AlI₃

Thus, the theoretical yield of AlI₃ is 121 g

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Answer:

Non Metal:

Explanation:

for ionic/covalent bonds.

brittle and nonmalleable.

low melting/boiling points.

High ionization energy and electronegativity.

Metal:

Metals are lustrous, malleable, ductile, good conductors of heat and electricity.

The density of this gas mixture at 725 K and 6.13 atm is 21.68g/L.

Density of the gas will be calculated by dividing the mass of gas by their volume.

For this first we have to calculate the volume of gas by using the ideal gas equation as:

PV = nRT, where

P = pressure = 6.13 atm

V = volume = to find?

R = universal gas constant = 0.08206 L.atm / mol.K

T = temperature = 725K

n is the moles of gas and it is mention that oxygen, nitrogen and argon have same moles and we let it be x, moles of this would be calculated from 149g as:

3x = 149 / (14+16+40) = 2.12

x = 0.709 moles

On putting all these values on the ideal gas equation, we get the value of V as:

V = (0.709)(0.082)(725) / 6.13 = 6.87 L

Now we consider the value to calculate the density as:

Density = 149 / 6.87 = 21.68g/L

Hence, the required density of mixture is 21.68g/L.

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answer:

O= 2 atoms

Li= 3 atoms

Answer:

Athletes can increase their stores of glycogen by regularly eating high-carbohydrate foods.

Explanation:

If carbohydrate in the diet is restricted, a person's ability to exercise is compromised because there is not enough glycogen kept in storage to fuel the body.

Answer:

carbohydrates

Explanation:

Athletes can increase their stores of glycogen by regularly eating high-carbohydrate foods. If carbohydrate in the diet is restricted, a person's ability to exercise is compromised because there is not enough glycogen kept in storage to fuel the body.

Answer:

B

Explanation:

p block bc its last orbit is 4p5

Answer:

Explanation:

P. block

Answer:

The reaction rate for reactants is negative because the reactants are being used up as the reaction produces from left to right. the rate of the products is positive because they are being formed.

Explanation:

Hope this helps

A force is only balanced when the net force is zero. Note that unbalanced forces causes a body to accelerate.

According to Newton's law, an object will only move when it is acted upon by an unbalanced force. Hence, if the forces acting on an object are balanced, it will not move. A flower pot sitting on a table has a zero net force acting on it.

When a leaf is falling to the ground, it is acted upon by an unbalanced force. Note that unbalanced forces causes a body to accelerate. If a body in motion is acted upon by balanced forces, the objects motion does not change.

The action of unbalanced forces leads to acceleration  of a body or change in direction. Hence, when unbalanced forces act on an object that is in motion, the object can change speed, direction, or both. A force is only balanced when the net force is zero.

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Answer:

1.84mm Hg

Explanation:

Answer: zinc(Zn) and aluminum (AI)

Explanation:

I took the test :)

In this redox reaction Zn + 2H+ → Zn2+ + H2, 2Al + 3Cu2+ → 2Al3+ + 3Cu

zinc ( Zn ) and aluminum ( Al ) are oxidized.

Redox reactions include a change in the oxidation state of the substrate. Similar to how reduction is the acquisition of electrons while oxidation is the loss of electrons or an increase in the oxidation state.

The combined processes of oxidation and reduction are known as redox reactions due to their complimentary nature. The oxidizing agent is the reactant that causes the oxidation, while the reducing agent itself reduces this reagent.

An atomic exchange of electrons between atoms causes a chemical reaction known as a redox reaction. The primary distinction between oxidation and reduction is that the former involves an increase in an atom's oxidation status while the latter involves a decrease in its oxidation state.

Thus, option C is correct.

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Answer: 15 g/cm^3

Explanation: formula for density is d= m/v where d is the density, m is the mass and v is the volume. If we plug in the values from the question, we get d= 75/ 5. 75 divided by 5 is 15 so the density is 15 grams per cubic centimetre.

Answer:

Notice that the value 12.01 grams of natural carbon is the same as the atomic mass value (12.01 amu). It also tells us that 20.34 grams of aluminum contains exactly 6.022 x 1023 atoms of aluminum.

Explanation:

Mole measure the number of elementary entities of a given substance that are present in a given sample.  There are 4.16gram of  aluminum in9.67 x 10²²atoms of aluminum.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. Mole is inversely proportional to avogadro number.

Given number of atoms= 9.67 x 10²²atoms

we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number

mole =given number of atoms ÷ 6.022×10²³(Avogadro number)

Substituting the values

mole=9.67 x 10²²÷ 6.022×10²³

mole = 0.16moleof Aluminum

mass of aluminum= 0.16moleof sodium×26g/mol

mass of aluminum =4.16gram

Therefore, there are 4.16gram of  aluminum in 9.67 x 10²²atoms of aluminum.

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Moles = Number of Atoms ÷ Avogadro's Number

          =  (60.22 × 10²³ atoms) ÷ (6.022 × 10²³ atoms/moles)

          = 10 moles

Answer:

Each 24 hours for every 5 pounds of turkey. So a 15-pound bird will take around 3 days to thaw completely.

Explanation:

The cell membrane which is more fat permeable will be present at the end of the process.

Solvent extraction is a very important method if separating mixtures. The principle of solvent extraction is based on the idea of like dissolves like. A substance dissolves in the component of the system in which it is most soluble.

If a cell extract is dissolved in a nonpolar solvent, the cell membrane which is mostly permeable to nonpolar molecules will dissolve most in the solvent.

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Answer:

A. chlorophyll

Explanation:

Plants use chlorophyll the most & I took the test.

3)  1.05  is  the  correct  answer

9.7  -  8.65  =  1.05

Answer:

1.05

Explanation:

8.65-9.7=-1.05cm

Answer:

C ( 500K and 0.1atm)

Explanation:

Answer:

c because she crating the energy

Answer:

oxygen, carbon, hydrogen, nitrogen, and sulfur

Explanation:

ok im here to help with your 5th grade homework

Answer: To 5 ZnSO4 is I think 1 sulfur atom and 6 total

to Li2SO4 i think it is 1 sulfur atom 7 total

to Al2(SO3)3 I think its 3 sulfur atom 17 total

Explanation: I could be wrong

The number of the sulfur atom in [tex]\rm \bold{ZnSO_4}[/tex] is 1, and the total number of atoms is 6.

In the structure of [tex]\rm \bold{Li_2SO_4}[/tex], the number of sulfur atom is 1, and the total number of atom is 7 atoms.

In the structure [tex]\rm \bold{Al_2(SO_3)_3}[/tex], the number of sulfur atom is 3, and the number of total atoms are 14.

The number of atoms can be calculated by the molecular formula. The subscript to the atom gives the idea about the number of atoms.

The number of sulfur atom = 1

Total number of atoms = 1 Zn atom + 1 Sulfur atom + 4 Oxygen atom

Total number of atoms = 6 atoms

Total number of Sulfur atom = 1

Total number of atoms = 2 Li atoms + 1 Sulfur atom + 4 Oxygen atom

Total number of atoms = 7 atoms

Total number of sulfur atoms = 3

Total number of atoms = 2 Al atoms + 3 sulfur atoms + 9 Oxygen atoms

Total number of atoms = 14 atoms.

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Answer:

Any solid may be sublimed if its temperature and pressure are below its triple point. For example, if you were to freeze water into ice and cool it further and then reduce the pressure, you could get ice to sublime. Some other examples include: Dry ice (solid CO2) which sublimes at atmospheric pressure and -78 C, and C60 (buckyballs) which sublimes at atmospheric pressure at around 800 K.

Explanation:

Answer:

C.The rate of the reaction increases.

Explanation:

Answer:

Energy transfer is the movement of energy from one location to another.

Explanation:

Energy transfer is the movement of energy from one location to another. Energy transformation is when energy changes from one form to another – like in a hydroelectric dam that transforms the kinetic energy of water into electrical energy.

The circulatory system is the body's transport system. It is made up of a group of organs that transport blood throughout the body. The heart pumps the blood and the arteries and veins transport it.