The first eight ionization energies of a third row element are 1012, 1907, 2914, 4964, 6274, 21267, 25431, and 29872 kj/mol. Identify the element.

The formula Sr₂O₂ is incorrect for strontium oxide, because it is not the simplest formula for this compound.

The correct formula for strontium oxide is SrO.

There are equal numbers of positive and negative ions.

Ratio of the cations and anions is 1 : 1.

Strontium is Earth alkaline metals, group 2 in Periodic system of the elements.

Strontium electron configuration: ₃₈Sr 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶5s²; two valence electrons is 5s² orbital.

Oxygen will form anion O²⁻.

Electron configuration of oxygen atom: ₈O 1s² 2s² 2p⁴.

Oxygen gain two valence electron to form anion with stable electron configuration as noble gas neon (atomic number 10).

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Explanation:

Opening the container will be difficult due to the low pressure. But, if you manage to get it open, then air from outside will immediately rush in. The pressure will rise up to atmospheric pressure, and the boiling point of water will go back up to 100°C.

5.8 x 10^²³ atoms of mercury are in a 1.286e1 ml sample. Density is a measure of how tightly a material is packed.

Defined as mass per unit volume. Density symbol: D or ρ Density formula: ρ = m/V, where ρ is the density, m is the mass of the object, and V is the volume of the object.

Data given is:

density of liquid mercury = 13.6g/10 cm³

Volume =1.286x [tex]10^{1}[/tex]mL

Calculation:

we know, 1 mL = 110 cm³

Volume= 1.286x[tex]10^{1}[/tex] cm³

w = Dv

= 13.69g/cm ^ 3 x 1.286 x[tex]10^{110}[/tex] cm³

= 176.05g

Calculate moles of mercury. Molar mass of mercury = 200.5g / mol

No of  moles = 176.05 g / 200.5g/mo|

=0.8776 mol  of Mercury

we know,

I mol = 6.022x10^²³  atom

0.8776 mol= 6:022×10^²³ x0.8776 atom

=5.28x10^²³ atom

=5.8 x 10^²³ atom

=5.8 x 10^²³ atom of Mercury.

Hence, 5.8 x 10^²³ atoms are present in murcury.

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Adding water to each solid quickly separates them; K₂SO₄ is soluble while BaSO₄ is insoluble. K₂SO₄ cannot form a precipitate, whereas BaSO₄ can form a precipitate.

Many factors influence solubility, one of which is lattice energy or the stability of the lattice and bond. The rule now states that bigger anions are stabilized by bigger cations and smaller anions are stabilized by smaller cations.

Since (SO4)²⁻ is a larger anion, the stability of the compound rises as the size of the cation does as we move down the group. As a result, the solubility drops. BaSO₄ is therefore insoluble.

Now, this goes against the trend found for k⁺. K₂SO₄ is an ionic molecule in this instance, and most ionic molecules are soluble in water. Dipoles and the extreme polarity of ionic substances are reasons for their solubility. Although they are held together so firmly that water is unable to separate them, not all ionic substances are soluble in water.

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Cacl2 has the largest lattice energy.

The lattice energy of CaCl2 is -2195.2 kJ/mol. The calcium salt calcium chloride has a wide range of applications in both home and industrial settings. The molar mass of calcium chloride, which has the chemical formula CaCl2, is 110,983 g/mol. The calcium cation (Ca2+) and two chlorine anions make up an ionic compound (Cl–).
Lattice energy cannot be objectively quantified, although it can be measured using electrostatics or inferred using the Born-Haber cycle.
The size of the ions affects the lattice energy in an inverse manner: the greater the electrostatic attraction between the smaller ions, the greater the lattice energy. Two crucial elements that influence the lattice energy's magnitude are the bonded ions' charge and radius.

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Compound that would have the highest boiling point is c) CH₃CH₂CH₂CH₂CH₂OH.

Pentan-1-ol (CH₃CH₂CH₂CH₂CH₂OH) is an alcohol with boiling point of 137⁰C.

While boiling, liquid pentan-1-ol is changed into gaseous pentan-1-ol.

Alcohols have higher boiling point than ethers, because it can form hydrogen bonds (see the picture below).

Between molecules of water there are hydrogen bonds, which must be brake so water can evaporate.

Hydrogen bond is an electrostatic attraction between two polar groups in which one group has hydrogen atom (H) and another group has highly electronegative atom such as nitrogen (like in this molecule), oxygen (O) or fluorine (F).

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because the temperature is low so the chemical reactions affect the reaction rate

If the elements achieve the following ions then they are likely to attain the noble-gas configurations. The example of elements attaining ionic forms are given below:

[Ne], N3−

[Ar], Ca2+

[Ar], S2−

[Kr], Br−

Noble gas configuration refers to the symbol of the last Nobel gas and the configuration of the remaining electrons of the atom preceding that Nobel gas.

According to the Nobel gas configuration, if an atom has 8 electrons in the valence shell then it becomes the most stable atom.

All noble gases have eight electrons in their outermost shells making them the most stable and inert elements of the periodic table.

For example, the Neon symbol refers to the standard Nobel gas configuration thus making the noble gas configuration for sodium [Ne]3s1.

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The net ionic equation for the reaction that occurs when aqueous solutions of sodium hydroxide and hydrocyanic acid are combines is

OH−(aq)+HCN(aq)→CN−(aq)+H2O(l)

What is ionic equation?

A chemical equation known as an ionic equation expresses the electrolytes in aqueous solution as dissociated ions.

Deprotonation of the acid by the hydroxide ion from the base occurs when weak acids like hydrocyanic acid are mixed with strong bases like sodium hydroxide. The conjugate base of the acid and water is created as a result of this reaction.

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Answer:

False

Explanation:

A model is a representation of a more complex system.

Answer:

False

Definition:

The scientific model is a condensed depiction of complicated or invisible to the human sight scientific systems, such an atom or a solar system. Although this representation is simplified, it is nevertheless accountable for producing all of the original systems' essence, substance, and behavior. This allows the models to be employed in scientific studies and research and to provide tangible outcomes that accurately reflect the actual systems.

What is a scientific model?

A scientific model is a simplification that roughly represents the real world while making it simple to think about issues, gain clarity and understanding, and perhaps forecast behavior.

Say, "The world is flat!" as an example. Actually, if you were alive 10,000 years ago, this estimate wasn't so awful. In general, everything you see around you suggests that the globe *is* flat, especially if you're living on a large grassy plane. Forget some of the boundary difficulties around the "edge of the globe"; perhaps it just never ends.

Then, though, you could start to see ships if you go to the ocean and stare out across that huge horizon. The sail is shown first, followed by a little portion of the mast, and then the ship's body. Hmm. That must imply that the spacecraft was underneath the earth's "flat surface," or...

The globe that is the earth (Or having a burrito-like form. But for now, let's stick with spherical.) That's fascinating. That would indicate that if I go from one location on Earth to another and keep moving, I would ultimately return to the original location. This proposition is testable!

The Earth is not a perfect spherical, of course. Its core protrudes a little bit. But a sphere is a reasonably good scientific model for the Earth for all everyday practical purposes (with the exception of things like GPS and satellite communications, etc.).

Similar to this, other scientific models should be as straightforward as feasible in order to explain occurrences and offer some level of testable prediction potential.

Thanks,
Eddie

The change that can make the model of nitrogen atom more accurate is to show 7 neutrons in the nucleus. The correct option is C.

An atom is a matter unit of matter that defines a chemical element distinctively. An atom is made up of a central nucleus one or more negatively charged electrons.

The nucleus is positively charged and encompasses one or more protons and neutrons, which are relatively heavy particles.

Nitrogen is an atom with seven protons, seven neutrons, and seven electrons. The nucleus is made up of neutrons and protons that are all stuck together in the middle of the atom.

The addition0. of 7 neutrons in the nucleus can improve the accuracy of the nitrogen atom model.

Thus, the correct option is C.

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Your question seems incomplete, the complete question is:

A students drawing of a nitrogen atom is shown. What change would make the model more accurate?

A-move the electrons into the nucleus

B-add 2 more protons

C-show 7 neutrons in the nucleus

D-remove 2 electrons

The amount of ml for 22% NaCl solution required to formulate the prescription is 139ml.

To find the solution need to formulate prescription, the given data's are,

30% of Nacl solution will have 250 ml

Find for 22%.

Sodium chloride, or salt, is an ionic substance with the chemical formula NaCl that represents a 1:1 ratio of sodium and chloride ions.

The body that required NaCl also known as salt, Sodium Chloride (NaCl) is critical for proper functioning of the human body.

From the given values,

22/100x + 40/100(250-x) = 30/100 × 250

22x + 40(250 - x) = 30 × 250

22x - 40x = 7500 - 10000

18x = 2500

x = 2500/18

x = 138.89ml

Thus, from the metrics given, it is correct to state that the amount of ml of 22% NaCl solution required to formulate the prescription is 139ml.

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A weak acid ha, has a p k a of 5.0. if 1.0 mol of this acid and 0.1 mol of naoh were dissolved in one liter of water, 4.05 is final ph .

The term pH, which originally stood for "potential of hydrogen" (or "power of hydrogen"), is used in chemistry to describe how acidic or basic an aqueous solution is. Greater pH values are seen in basic or alkaline solutions than acidic solutions.

Since hydrogen ions are logarithmic, the pH scale shows how many of them are present in a solution in inverse proportion.

M = mol dm3, where. Acidic solutions have a pH under 7, while basic solutions have a pH over 7, at a temperature of 25 °C (77 °F). At this temperature, solutions with a pH of 7 are neutral (i.e., have the same amount of H+ and OH- ions, like pure water), meaning they don't react with one another. Temperature has an impact on the pH's neutral value.

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Answer:

if earth was closer to the sun think about it a magnet the closer the more powerful

follow me;)

The statement that would decrease the gravitational pull between the sun and Earth is as follows:

Thus, the correct option for this question is D.

Gravitational pull may be defined as the methodology through which the force of attraction that bodies apply to one another with respect to their prospective masses.

According to the context of this question, the gravitational pull is strongest when two bodies reside close to one another. But, when they are farther, this force of attraction lowers.

If the sun was twice its size, its gravitational pull strengthen as compared to the earth, while if Earth was twice its size, it is found that the gravitational pull of the earth strengthens.

Therefore, if the sun was farther away from Earth is a statement that would decrease the gravitational pull between the sun and Earth. Thus, the correct option for this question is D.

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Dispersion forces are very weak electrostatic attractions that occur due to the random electronic motion within all substances, including - those that are nonpolar.

Dispersion force is also called an induced dipole-induced dipole attraction.

The London dispersion force is the weakest intermolecular force.

The London dispersion force (intermolecular force) is a temporary attractive force between molecules.

Dispersion forces make nonpolar substances (for example oxygen, nitrogen) to condense to liquids and freeze into solids in low temperatures.

In nonpolar bonds the arrangement of electrons are in the middle between two atoms.

For example, nitrogen molecule (N₂) has strong nonpolar triple covalent bond (:N:::N:), that is why it is very stable and have low reactivity.

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A substance has an extended structure composed of two different elements. The elements are a metal and a non-metal. The property would this substance most likely have is (B) has  a high melting point.

When a metal and a non - metal combine it will  form ionic compound. while when nonmetals combine with other nonmetal it will form covalent compound.

An ionic compounds have high melting point because an electrostatic force between particles is very high and difficult to break. so due to high electrostatic attraction between ions.

Thus, A substance has an extended structure composed of two different elements. The elements are a metal and a non-metal. The property would this substance most likely have is (B) has  a high melting point.

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The density of solid is 2730kg/m^3.

The amount of "stuff" in a certain amount of space is measured by its density. The definition of it is the mass per unit volume.

Given:

Total density = 2030kg/m^3

Water content = 25%

Gs= 2.73

Density of water = 1000kg/m^3

To find:

Density of solid = ?

Formula:

Dry density = moist density / 1 + water content

Density of solid = Gs x density of water

Calculations:

Density of solid = 2.73 x 1000

Density of solid = 2730kg/m^3

Dry density = 2030 / (1+0.25)

Dry density = 2030 / 1.25

Dry density = 1624kg/m^3

Result:

The density of solid is 2730kg/m^3 and the dry density of the soil is 1624kg/m^3.

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Element that would have a fixed charge of 2 in an ionic compound is c. Ba.

Barium (Ba) is a metal from the second group of the Periodic table of elements.

Barium looses two electrons and has a fixed charge of 2+ in an ionic compounds.

Electron configuration of the barium atom:

₅₆Ba 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 6s².

For example, in the salt barium chloride (BaCl₂) , barium has charge of 2+.

Aluminium (Al) has charge of 3+.

Potassium (K) has charge of 1+.

Cobalt (K) change charge, it depends of the compound.

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The dielectric constant of a binary solvent containing 20thanol in water is

24.55.

A simplified capacitor model can be used to calculate the dielectric constant , which is defined as the ratio of a material's electric permeability to that of vacuum (or free space).

The ratio of a substance's permittivity to the permittivity of empty space (0) is known as the medium's dielectric constant (K). i.e K=ε/ε0. The dielectric constant becomes a dimensionless quantity because the permittivity of the medium and the permittivity of free space have the same units (F/m, or Farad/meter).

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\begin{gathered}6x - 2y = 6 \\ 6x = 6 + 2y \\ x = \frac{6 + 2y}{6} \end{gathered}

6x−2y=6

6x=6+2y

x=

6

6+2y

The molarity of 0.800 moles of sugar in 250 ml of solution is 3.2 M

To solve this molarity problem, the formulas and the procedures that we have to use are:

M = n(solute)/v(solution) L

Where:

Information about the problem:

Converting the volume units from (ml) to (L) we have:

v(solution) =  250 ml * (1 L/1000 ml)

v(solution) = 0.250 L

Applying the molarity formula, we get:

M = n(solute)/v(solution) L

M = 0.800 mol  / 0.250 L

M = 3.2 M

In chemistry a solution is known as a homogeneous mixture of two or more components called:

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Incorrect question .

Corrected question- Write the chemical symbol for three different atomic cations that all have 12 electrons.

The number of protons inside the nucleus always remains constant.

∴Chemical symbol of three different atomic cation that have 12 electrons:

Atomic cation is the ion with positive electric charge on it, it means it should have more protons than electrons.

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Al⁺, Si²⁺ ,P³⁺ are the atomic cations with 12 electrons.

∵The nucleus always contains the same number of protons.

∴Three distinct atomic cations with 12 electrons each have the following chemical symbol:

1. Al⁺

2. Si²⁺

3. P³⁺

An ion or atomic cation with a positive electric charge is thought to have more protons than electrons.

• Aluminum (Al) contains 13 electrons, hence Al+ will have = 13 - 1→ 12 electrons (1 electron will be lost for every additional charge).

• Si2+ will have = 14 - 2→ 12 electrons since silicon (Si) has 14 electrons. (+2 charge signifies electron loss of 2);

• Because phosphorus (P) has 15 electrons, P3+ will have 12 electrons because 15-3. (+3 charge indicates that 3 electrons will be lost.)

Hence, Aluminium, Silicon and phosphorus cations have 12 electrons.

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Your question is incorrect. The correct question is -Write the chemical symbols for three different atomic cations that all have 12 electrons.

Particles can be arranged in a variety of ways. Particles of liquid gold move closer together as it solidifies. Thus, option D is correct.

When a liquid is cooled and transforms into a solid, freezing takes place. A solid is created when the particles in a liquid eventually cease moving and settle into a stable configuration.

Attractive forces start to capture particles, and a solid's crystals start to take shape.

Therefore, the rearrangement of particles in a physical change describes When liquid gold becomes a solid, its particles get closer together.

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Answer:

The answer is option D on indeguity

Explanation:

The molality of a solution prepared by dissolving diethyl ether is 2.76 m.

m(C₄H₁₀O) = 86.9 g; mass of diethyl ether

M(C₄H₁₀O) = 74.12 g/mol; molar mass of diethyl ether

n(C₄H₁₀O) = m(C₄H₁₀O) ÷ M(C₄H₁₀O)

n(C₄H₁₀O) = 86.9 g ÷ 74.12 g/mol

n(C₄H₁₀O) = 1.17 mol; amount of diethyl ether

m(C₆H₆) = 425 g = 0.425 kg; mass of benzene

b = n(C₄H₁₀O) ÷ m(C₆H₆)

b = 1.17 mol ÷ 0.425 kg

b = 2.76 mol/kg;  the molality of a solution

Molality is a measure of the concentration of a solute in a solution in terms of amount of substance in a specified amount of mass of the solvent.

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The acid must always be added to water with constant stirring because the process is highly exothermic and it can be dangerous. Therefore, the assertion is correct but the reason is incorrect.

1.Acid is thoroughly diluted with water before being added.

2.It should be introduced very gradually while being stirred continuously.

3.Acid addition to water is a highly exothermic reaction, releasing a lot of heat in the process.

4.The heat produced by the stirring is absorbed by the water, making the situation safer.

5.The amount of ions in a given volume are more concentrated when an acid and water are combined. However, it has nothing to do with continuously swirling acid into water.

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Answer:

exothermic chemical reaction.

Explanation:

you can feel it

Answer:

Alkynes

Explanation:

Alkynes are hydrocarbons which contain carbon-carbon triple bonds. Their general formula is CnH2n-2 for molecules with one triple bond (and no rings). Alkynes undergo many of the same reactions as alkenes, but can react twice because of the presence of the two p-bonds in the triple bond.