How many neutrons are present in an atom of

Answer:

Kinetic energy of electron = -E₂ = 3.4 ev

Kinetic energy of electron = -E₄ = 0.85 ev

Explanation:

In case of hydrogen atom energy associated with nth state is,

En =  -13.6/n²

For n = 2

E₂ = -13.6 / 2²

E₂ = -13.6/4

E₂ = -3.4 ev

Kinetic energy of electron = -E₂ = 3.4 ev

For n = 4

E₄ = -13.6 / 4²

E₄ = -13.6/16

E₄ = -0.85 ev

Kinetic energy of electron = -E₄ = 0.85 ev

It ISNT occurs in substances that have discrete molecular structure

Explanation:

I took the test and got this wrong

Answer:

Oxygen atoms form two double bonds in silicon(IV) oxide.

Silicon(IV) oxide has a high melting point.

Explanation:

Silicon dioxide is structurally analogous to carbon dioxide in the sense that it also contains two oxygen atoms that are double bonded to silicon the central atom in the molecule.

Silicon dioxide has a very high melting point of about 1710 degrees centigrade because of its large macromolecular structure which requires much energy to break such intermolecular interactions.

Answer:

[tex]Amount\ of\ Grams = 0.2644 g[/tex]

Explanation:

Given

Element: Sodium

[tex]Atoms = 6.92 * 10^{21}[/tex]

Required

Determine the amount of grams

We start by solving for the number of moles

[tex]Moles = \frac{Sodium\ Atoms}{Avogadro\ Number}[/tex]

[tex]Avogadro\ Number = 6.022 * 10^{23}[/tex]

So, we have:

[tex]Moles = \frac{6.92 * 10^{21}}{6.022 * 10^{23}}[/tex]

[tex]Moles = \frac{6.92 * 10^{21-23}}{6.022}[/tex]

[tex]Moles = \frac{6.92 * 10^{-2}}{6.022}[/tex]

[tex]Moles = 1.15 * 10^{-2}[/tex] moles

Next, we calculate the amount of grams.

Mass per mol of Sodium = 22.98977g/mol

For [tex]1.15 * 10^{-2}[/tex] moles of sodium

[tex]Amount\ of\ Grams = 1.15 * 10^{-2}\ mol * 22.98977g/mol[/tex]

[tex]Amount\ of\ Grams = 1.15 * 10^{-2} * 22.98977g[/tex]

[tex]Amount\ of\ Grams = 0.264382355 g[/tex]

[tex]Amount\ of\ Grams = 0.2644 g[/tex] (approximated)

Hence, there are 0.2644g of sodium in [tex]6.92 * 10^{21}[/tex] atoms

Answer:

in parallel

Explanation:

All of the home equipment in the residence are linked in parallel.

parallel association

electric appliances are connected in a parallel arrangement in a house circuit because every appliance gets complete voltage as resistance in a parallel association is low.

electric appliances are not linked in series because the cutting-edge can be the same thru all the home equipment connected but voltage increases if extra no. Of appliances are related. If the battery has low voltage than the full voltage it can short circuit.

research greater approximately the parallel.

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Answer:

the lava viscosity defines the size and shape of a volcano. Even though lava is 100,000 times more viscous than water, it can still flow great distances. When lava has low viscosity, it can flow very easily over long distances. This creates the classic rivers of lava, with channels, puddles and fountains.

Answer:

answer c

Explanation:

Explanation:

Atomic radius decreases from left to right in a period.

Therefore Calcium would have a smaller atomic size.

Answer:

Its B Nylon

Explanation:

i just took the quiz and got it right.

Answer:

nylon

Explanation:

nylon is a common material used for nets and it is strong

Answer:

mass = 78 grams

volume= 2*5*6=60cm^3

density =m/v

=78/60

13/10=1.3 g/cm^3

Explanation:

The mass of the block of metal would be 780 grams

The volume of the block of metal would be  60 centimeter³

The density of the block of the metal is 13 g/cm³

It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.

The density is the reciprocal of the specific volume of any substance.

ρ =m /v

As given in the problem a block of metal has dimensions of 2 cm by 5 cm by 6 cm. The block weighs 780 grams

The volume of the block of metal would be  = 2×5×6 centimeter³

                                                                         = 60 centimeter³

The mass of the block of metal = 780 grams

ρ =m /v

ρ = 780 /60 gram/ cm³

ρ = 13 g/cm³

Thus, the mass volume and the density of the block of the metal would be  780 grams , 60 centimeter³, and 13 g/cm³ respectively.

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The mass of the silver : 4.6 g

Heat can be calculated using the formula:  

Q = mc∆T  

Q = heat, J  

m = mass, g  

c = specific heat, joules / g ° C  

∆T = temperature difference, ° C / K  

∆T = temperature difference :

[tex]\tt 46-22=24^oC[/tex]

The specific heat of silver is  0.235 J/gºC

Q = heat = 26 J

The mass :

[tex]\tt mass(m)=\dfrac{Q}{c.\Delta T}\\\\m=\dfrac{26}{0.235\times 24}\\\\m=4.6~g[/tex]

Answer:

Nitrogen-15

Explanation:

To use the correct notation, you need to use the mass number.  The mass number is the number of protons plus the number of neutrons.  Nitrogen has 7 protons.  This isotope of nitrogen has 8 neutrons.

The correct notation is nitrogen-15.

Answer:

Electricity is made at a generating station by huge generators. The current is sent through transformers to increase the voltage to push the power long distances.  The electrical charge goes through high-voltage transmission lines that stretch across the country.

Answer:

9.1% error

Explanation:

Full Question:

Answer:

Ksp = 2.74 x 10⁻⁵

Explanation:

The solubility equilibrium for Ca(OH)₂ is the following:

  Ca(OH)₂(s) ⇄ Ca²⁺(aq) + 2 OH⁻(aq)

I                          0                0

C                       + s               + 2s

E                        s                   2s

According to the ICE table, the expression for the solubility product constant (Kps) is:

Ksp = [Ca²⁺] x ([OH⁻])² = s x (2s)² = 4s³

Then, we calculate Ksp from the solubility value (s):

s = 0.019 M

⇒ Ksp = 4s³ = 4 x (0.019)³ = 2.74 x 10⁻⁵

The Ksp value of Ca(OH)2 is [tex]2.74 \times 10^-^5[/tex].

The Ksp is the solubility product constant.

The solubility equilibrium is

[tex]Ca(OH)_2(s) = Ca^2^+(aq) + 2 OH^-(aq)[/tex]

I                     0                  0

C                     s               +2s

E                     s                 2s

By the ICE table, the expression for Ksp is

[tex]\rm Ksp = [Ca^2^+] \times ([OH^-])^2 = s \times (2s)^2 = 4s^3[/tex]

Now, calculate the Ksp

s, solubility value is 0.019 M

then, [tex]\rm Ksp = 4s^3= 4 \times (0.019)^3 = 2.74 \times 10^-^5[/tex]

Thus, the Ksp value is [tex]2.74 \times 10^-^5[/tex]

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Volume of 20 g of hydrogen at normal temperature and pressure (NTP) = 240.55 ml.

[tex]\huge\sf\underline{\underline{\red{❥︎ Thanks}}}[/tex]

Strong bases are bases which completely dissociate in water into the cation and OH- (hydroxide ion). The hydroxides of the Group I (alkali metals) and Group II (alkaline earth) metals usually are considered to be strong bases. These are classic Arrhenius bases. Here is a list of the most common strong bases.

LiOH - lithium hydroxide

NaOH - sodium hydroxide

KOH - potassium hydroxide

RbOH - rubidium hydroxide

CsOH - cesium hydroxide

*Ca(OH)2 - calcium hydroxide

*Sr(OH)2 - strontium hydroxide

*Ba(OH)2 - barium hydroxide

A strong base has been indicated with the ability to be a good conductor of electricity. Hence, option B is correct.

Bases are defined as compounds that have the ability to form the release of the negative ions or the hydroxide ions in the solution. The acids release hydrogen or proton, thereby bases tend to have the ability to neutralize acids.

The pH has been the measure of the solution to be able to accept or donate the protons and electrons. The pH has been measured on a scale of 1-14 with the acids having a pH of less than 7, and the pH of bases tends to move towards 14. 7 is the neutral pH.

The strong bases form the dissociation of the ions in the solution more readily, and ions contribute as the medium, thereby forming the conduction of the electricity. Hence, option B is correct.

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Fluorine, I still remember this from my science fair

Answer:

Acidic Oxides: Acidic oxide are oxides that react with water to form an acid. Acidic oxides are formed by reaction of non metals with oxygen .

[tex]S+O_2\rightarrow SO_2[/tex]

[tex]SO_2+H_2O\rightarrow H_2SO_4[/tex]

Basic Oxides: Basic oxides are oxides that react with water to form bases. Basic oxides are formed by reaction of metals with oxygen.

[tex]2Mg+O_2\rightarrow 2MgO[/tex]

[tex]MgO+H_2O\rightarrow Mg(OH)_2[/tex]

Answer:

B) It will decrease because fewer particles will have the required activation energy.

Explanation:

Temperature is one of the important factors that affect the rate of a chemical reaction. An increase in the temperature of a reaction will cause the reactants to gain more kinetic energy and hence, reduce the energy required for reactants collision (start) to occur i.e. activation energy.

Note that, once the activation energy is reduced, the rate of reaction is increased. In this case, the temperature of a reaction vessel with liquid reactants is lowered to one-third (1/3) of the original temperature. Due to a reduction in the reaction's temperature, the rate of reaction will also decrease because fewer particles will have the required activation energy.

Answer:

B. It will decrease because fewer particles will have the required activation energy.

Explanation:

I took the text :)

Answer:

The correct option would be 'electrons

Explanation:

Answer:

100

Explanation:

nsvcscjkvschssvds

Answer:

i think a or b

Explanation:

Answer:

Targeted fat loss

Explanation:

Answer:

Spot reduction

Explanation:

<3

Answer:

Power and Nuclear Fision

Answer:

ummm molecules i have no idea- i tried tho..

Explanation:

is known as a diatomic element hydrogen is the lightest element has an atomic number of one uses the symbol H at standard temperature and pressure hydrogen is an odorless and colorless gas it is combustible and produces water when it burns in air hydrogen is also the most abundant element in the universe with 90% of atoms in the universe being made of hydrogen main sequence Stars such as the sun burn hydrogen as fuel

Answer:

188.1J

Explanation:

obtained from Q=MCT

Explanation:

For the two samples, the mass and volume of the foil are different but irrespective of this, the density of the aluminum foil will remain the same.

Mass depends on the amount of matter present and as given in the description, the sample with a high number has more mass.

Volume is the amount of space a substance occupy.

Answer:

amount of matter

Explanation: