Use the periodic table to identify the number of valence electrons available for bonding for each of the following elements.

C :
H:
N:

O:
P:
CI:

Answer:

The third ionization energy is the energy it takes to remove an electron from a 2+ ion. (That means that the atom has already lost two electrons, you are now removing the third.) And 2nd ionization energy is higher than 1st ionization energy, 3rd is higher than 2nd, and so forth.

hope it is helpful :)

Answer:

1 to 5 days

Explanation:

Answer:

being cation it migerates to cathode to be reduced to elemental magnesium

Explanation:

Mg+2. +2e -----------Mg

Answer:

Silver

Explanation:

Silver has the highest thermal conductivity of any element and the highest light reflectance.

Answer:

ion-dipole forces

Explanation:

positive sodium ion will be attracted to the slightly negative oxygen atoms in the water molecule, while the negative chloride ion is attracted to the slightly positive hydrogen atoms.

Answer:

zinc oxide is only sparingly soluble in water so best option is to add zinc oxide to diluted hydrocrolic acid

When all the hydrochloric acid (HCl) has reacted, the student can obtain zinc chloride (ZnCl) solution from the reaction mixture by adding ZnO to diluted HCl.

A mixture simply refers to a combination of two (2) or more substances or chemical compounds that are present in varied proportion, and they can be visibly seen with na-ked eyes.

In this scenario, the student can obtain zinc chloride (ZnCl) solution from the reaction mixture when all the hydrochloric acid (HCl) has reacted by adding zinc oxide (ZnO) to diluted hydrochloric acid (HCl) because it's sparingly soluble in water.

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Por definición de molaridad y densidad, la molaridad de la solución es 1.66 [tex]\frac{moles}{litros}[/tex].

La concentración molar o molaridad es una medida de la concentración de un soluto en una disolución que indica el número de moles de soluto que están disueltos en un determinado volumen.

La molaridad de una solución se calcula dividiendo los moles del soluto por el volumen de la solución:

[tex]Molaridad=\frac{numero de moles de soluto}{volumen}[/tex]

La Molaridad se expresa en las unidades [tex]\frac{moles}{litros}[/tex].

Por otro lado, la densidad es una magnitud que permite medir la cantidad de masa que hay en determinado volumen de una sustancia.

Entonces, la expresión para el cálculo de la densidad es el cociente entre la masa de un cuerpo y el volumen que ocupa:

[tex]densidad=\frac{masa}{volumen}[/tex]

En este caso, siendo H₂S el soluto, se colocaron 37 ml del ácido, siendo su densidad 1.36 [tex]\frac{g}{mL}[/tex]. Reemplazando en la definición de densidad se obtiene:

[tex]1.36\frac{g}{mL}=\frac{masa}{37 mL}[/tex]

masa= 1.36 [tex]\frac{g}{mL}[/tex]× 37 mL

masa= 50.32 g

Siendo 34 g/mol la masa molar de H₂S, es decir la cantidad de masa que una sustancia contiene en un mol, la cantidad de moles de H₂S puede ser calculada como:

[tex]numero de moles de H_{2}S= 50.32 grams\frac{1 mole}{34 grams}[/tex]

número de moles de H₂S= 1.48 moles

Siendo 890 mL=0.890 L el volumen de la solución, entonces la molaridad puede ser calculada como:

[tex]Molaridad=\frac{1.48 moles}{0.890 L}[/tex]

Molaridad= 1.66 [tex]\frac{moles}{litros}[/tex]

Finalmente, la molaridad de la solución es 1.66 [tex]\frac{moles}{litros}[/tex].

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Answer:

96mg

Explanation:

Since the half-life of Palladium-100 is 4 days and the sample has been reduced after 16 days, that means the sample has undergone four half-lives. To find the intial mass, just work backwards:

As you see, I've worked backwards from the four half-lives. So the initial mass after 16 days is 96 mg.

Answer : E cell standard is the potential difference between the two electrodes under standard conditions. Overall tendency for the redox reaction to occur spontaneously. A large positive E cell means the reaction is more spontaneous, and a negative E cell indicates a non spontaneous reaction.

Explanation: hope this answers your question

about 6 to 9 colines

if its from mouth if thats the case

Answer:

Fats........................

Lipids is the class of macromolecule was described as being most like the hydrocarbons.

Macromolecules are bigger molecules of large size and made of smaller molecules called as monomers, Polymers are macromolecules.

All Macromolecules are not like the hydrocarbon because the macromolecules not only consists of  C and H atoms but also N and O.

Macromolecules are classified into 4 types

Proteins , Carbohydrates , Lipids and Nucleic Acids

Lipids is the class of macromolecule was described as being most like the hydrocarbons.

Lipids are a broad category of chemicals that are mostly nonpolar in nature.

This is due to the fact that they are hydrocarbons with nonpolar carbon–carbon or carbon–hydrogen bonds.

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Answer:

5.96 g/cm^3

Explanation:

Corner atom = 1/8

Atoms in center = 1

Atoms in face of the cube= 1/2  

Molar mass of V = 50.94 g/mol (from period table)

1 mole = 6.02x10^23

In BCC unit cell:

(8 x 1/8)+ 1=2 per 1 unit cell

Mass: 2(50.94g)/6.02x10^23 = 1.69x10^-22 g/unit cell

305pm=(305x10^-12m÷10^-2m) x (1mL÷1cm^3)

           = 2.837 x 10^-23 mL

1pm=10^-12m

1cm=10^-2m

1mL=1cm^3

density=mass/volume

density of V = 1.69x10^-22g÷2.837x10^-23mL

                    =5.957g/mL

                    =5.96g/cm^3

Calcium oxide + water = calcium hydroxide.

Magnesium + hydrochloric acid = magnesium chloride + hydrogen.

Sodium hydrogen carbonate + citric acid  = Na3C6H5O7(aq)+3H2O(l)+3CO2(g)

Iron + salt water = 4Fe(OH)3 (rust)

Answer:

1. CaO + H2O _____ Ca(OH)2

Calcium oxide + Water _____ Calcium hydroxide

2. 2 HCI + MG _____ MgCl2 + H2

Magnesium + hydrochloric acid _____ Magnesium Chloride + hydrogen gas

Answer:

Differences

• Space is everything in the universe beyond the top of Earth's atmosphere - The moon, Stars, Milky way, etc.

• In space, no one can hear you scream. This is because there is no air in space, i.e, it's vacuum.

• Earth is a planet on solar system. It is the only planet where life exists!!

• Earth is also called "blue sky" cause it has 75% water.

Similarities

•They need oxygen for survival: Man, animals in earth and space need oxygen for survival.

•Water is also need to stay alive.

•Food is very paramount to both man, animal s and organisms.

•Shelter, we all ned a place to lay our head in other to be safe.

•Air everywhere in the atmosphere.

•Water, air, food and shelter are available on earth but their availability differs in space.

•Astronaut need to bring everything one need in space with him or her from Earth. They often recycle the things they bring.

Hope it helps :)

The atmospheric conditions in earth and space is entirely different. Therefore the living in earth and space will be far different on many aspects such as adaptations, habits etc.

The living things that are believed to be exists in out of earth is called aliens. Some studies shows that there is a possibility to find exotic species living in space.

The study which deals with aliens is called exo-biology. The atmosphere thus, the presence gases, temperature, pressure, etc. will be different for space from that in the earth.

Hence, aliens may need not the presence of oxygen for living as well as the atmospheric conditions that maintains living  in earth will not be there in space.

However, any living irrespective of earth or space need water and some kind of food to survive. Thus the presence of water in some planets opens the way to study the presence of livings there.

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Answer:

A. Core

Explanation:

The collisions which occur between the hydrogen atoms starts to heat the gas in the cloud. Once the temperature reaches 15,000,000 degrees Celsius, nuclear fusion takes place in the center, or core, of the cloud. The tremendous heat given off by the nuclear fusion process causes the gas to glow creating a protostar.

In a star, nuclear fusion which is a type of  nuclear reaction occurs in the core.

There are two types of nuclear reactions which are nuclear fusion and nuclear fission .They involve the combination and disintegration of the element's nucleus respectively.

In nuclear fission, the nucleus of the atom is bombarded with electrons of low energy which splits the nucleus in to two parts .Large amount of energy is released in the process.It is used in nuclear power reactors as it produces large amount of energy.

In nuclear fusion,on the other hand, is a reaction which occurs when two or more atoms combine to form a heavy nucleus.Large amount of energy is released in the process which is greater than that of the energy which is released in nuclear fission process.

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Answer:

it D because it make more sense

Answer:

A or D because B and C dont make sense

Answer:

Explanation:

Answer:

Circulatory System

Explanation:

Answer:

Air is made up of 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and other gases in meager amounts.

Answer:

No. Although alkali metals and alkaline earth metals are found in nature, they  are not found as pure elements. Group 1 and 2 are found in their chemical compounds, not pure form.

Given the Latin meaning of the cogito, we can confirm that it is roughly translated and summarized by the phrase "I think, therefore I am".

Cogito, ergo sum or "The Cogito" is an extremely popular, well-known philosophical phrase credited to Rene Descartes. This Latin phrase is roughly translated as "I think, therefore I am", which appeared originally in "The Principles of Philosophy", and was later translated to a variety of languages in an attempt to reach a wider public, most notably into Latin.

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inherited traits are passed from parent to offspring according to the rules of Mendelian genetics. Most traits are not strictly determined by genes, but rather are influenced by both genes and environment

Answer:

Physical changes can be classified as reversible or irreversible. Melting is an example of a reversible physical change.

Explanation:

Answer:

The expression for the wavelength of radiation is,

λ

1

=R(

n

1

2

1

−

n

2

2

1

)

Substitute values in the above expression,

λ

1

=109677×(

2

2

1

−

4

2

1

)=109677×(

4

1

−

16

1

)=109677×(

64

12

)

λ=4.86×10

−5

cm=486×10

−9

m=486nm.

The line belongs to bluish green colour.

Answer:

Cell membranes (plasma membranes) help organisms maintain homeostasis by controlling what substances may enter or leave cells.

8%

Explanation:

In a DNA molecule the no. of Adenine bases equal to that of Thymine bases

The no. of Cytosine bases equal to that of Guamine bases.

If we take no. of Thymine bases as x and no. of Cytosine bases as y,

Adenine + Thymine + Cytosine + Guamine = 100

x + x + y+y = 100

2( x+y) = 100

x+y = 50

y=42

therefore x= 50-42 = 8%

Answer:

i think its solar radiation

Answer:

Particles move faster the farther they are apart, so the container with the most spread out particles.