Help me please
This is for science

Answer: I dont want to make you wrong but I think its D.

The symbolic equation that indicates the dissolution of calcium oxide in water is CaO+H2O→Ca(OH)2+Δ

Calcium oxide+water →

Calcium hydroxide+heat

Calcium oxide can be defined as quicklime, is a widely used chemical compound. It is a white, caustic, alkaline and crystalline solid at room temperature.

Calcium oxide is used for purifying sugar in preparing bleaching powder, calcium carbide and calcium cyanamide. Its other uses are in water softeners, mortars and cement.

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Answer:

it have been already balanced

2H2 + O2 = 2H2O.

Answer: Elements found in group 1 (Alkaline Metals)

Explanation: Any element found in group 1, such as Lithium, Sodium, Caesium, or Francium, have similar properties as potassium. Atoms that are found in the same group on the periodic table have similar chemical properties.

The question is incomplete, the complete question is;

Arrange the following ionic compounds in order of decreasing amount of energy released in lattice formation: NaF, MgS, TlN, and CsI.

Answer:

TlN> MgS > NaF > CsI

Explanation:

Recall that lattice energy is the energy evolved when a crystal lattice is formed from its component ions.

The lattice energy depends on the size of the ions. The smaller the sizes of the ions, the larger the lattice energy.

The order of energy released in lattice formation for these compounds is;

TlN> MgS > NaF > CsI

Answer:

ive learned about the chart , ive learned about the coolest chemicle reactions and how. the can change colors , ive also learned that chenistrey is all around us since the beginning of life ,and how liquid can turn solid

Explanation:

In fact, sodium, potassium, or ammonium sulfates enhance ligand-protein interactions in HIC while also stabilizing protein structure. As a result, the most prevalent ions are (NH4)2SO4, Na2SO4, NaCl, KCl, and CH3COONH4. Figure 1 depicts how various salts can influence selectivity. The highest resolution of four standard proteins was achieved by starting with 1.7 M ammonium sulfate.

Because each salt has a different capacity to encourage hydrophobic interactions, selecting a salt for an HIC separation can be a trial and error process. When the concentration of a salt rises, the quantity of protein bound increases almost linearly up to a certain salt concentration and then exponentially at greater concentrations.When compared to other salts, ammonium sulfate often provides the greatest clarity at a particular concentration and can be used at ratios up to 2 M.

When using sodium chloride, concentrations of up to 3 M are typically needed.

Although sodium sulfate is an excellent salting-out substance, issues with protein solubility may preclude its use at high amounts.

Working with ammonium sulfate at pH levels above 8.0 is not advised.

Answer: Answer would be two

Explanation:

Answer:

B, C, D, F, I

Explanation:

A covalent bond is a chemical bond between two nonmetals (their electronegativity difference must be greater than 1.5-1.6)

.

A. Ca is a metal and O is nonmetal, so the bond in CaO is ionic

B. Both H and Cl are nonmetals, so the bond in HCl is covalent

C. Both C and O are nonmetals, so the bond in CO2 is covalent

D. Both S and O are nonmetals, so the bond in SO2 is covalent

E. Na is a metal and O is nonmetal, so the bond in Na2O is ionic

F. Both P and Cl are nonmetals, so the bond in PCl3 is covalent

G. Mg is a metal and O is nonmetal, so the bond in MgO is ionic

H. Na is a metal and H is nonmetal, so the bond in NaH is ionic

I. Both C and H are nonmetals, so the bond in CH2 is covalent

Answer: 7.24 atm

Explanation: To find the total pressure in the tank, we need to convert all of the pressures to the same unit. Let's convert the pressures to atmospheres (atm), since that is the unit requested in the question:

6.1 atm (given)

464 mmHg = 0.611 atm (since 1 atm = 760 mmHg)

7.69 psi = 0.529 atm (since 1 atm = 14.7 psi)

Now, we can add the pressures to find the total pressure in the tank:

Total pressure = 6.1 atm + 0.611 atm + 0.529 atm = 7.24 atm (rounded to two significant figures)

Therefore, the total pressure in the tank is 7.24 atm.

The labelling can be done as C=reactant, E=energy is released and D=Product. The type of reaction the reaction profile represents is exothermic reaction.

Exothermic reactions are chemical naturally occurring and are distinguished by the discharge of energy within the shape of heat or light. One instance of this kind of reaction, when the release comes in the manner of both light and heat, is lighting a match.

The exothermic reaction results in the release of energy as opposed to an endothermic response, which absorbs energy. This energy frequently exceeds the sum of the energies of the reactants. The labelling can be done as C=reactant, E=energy is released and D=Product. The type of reaction the reaction profile represents is exothermic reaction.

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The energy that it takes to melt 2 kg of ice is; 2 kg * 1000 g/kg * 1 mol/18.02 g * 6.03 kJ/mol = 669 kJ. The correct option is C.

Energy is a quantitative value. It is the entity that is used in every reaction because without it no reaction can occur. In animals and plants and other organisms, energy is needed to carry out biological functions.

Mass of ice, m = 2 kg

Molar heat of fusion for ice; \(\rm \Delta_fus.H = 6.03 kJ/mol at 0°C.\).

The molar mass of Ice which is water is; 18.02 g/mol

By the formula for calculating energy is:

E = (m/M) * Δ_fus.H

Putting the values in the equation:

E = (2 kg * 1000 g/kg) * 1 mol/18.02 g * 6.03 kJ/mol = 669 kJ

Thus, the correct option is C, 2 kg * 1000 g/kg * 1 mol/18.02 g * 6.03 kJ/mol = 669 kJ.

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3 moles⋅22.4 L/1 mole=67.2 L Likewise, 0.5 moles of gas will occupy half the volume 1 mole occupies 0.5 moles⋅22.4 L/1 mole = 11.2 L

Standard Temperature and Pressure conditions imply a temperature of 273.15 K and a pressure of 1 atm. When these conditions are met, 1 mole of any ideal gas occupies exactly 22.4 L. Keep in mind that ideal gas particles are assumed to have no volume of their own, that's why, for example, at STP 1 mole of helium gas will occupy the same volume as, say, 1 mole of chlorine gas.

However, as you can see in the picture, the two gases will have different masses because of the difference in their molar mass. The balloon filled with helium will weigh less than the one filled with chlorine, despite the fact that they occupy the same volume.

So, if 1 mole occupies 22.4 L, the immediate conclusion is that a bigger number of moles will occupy more than 22.4 L, and a smaller number of moles will occupy less than 22.4 L.

In your case, 3 moles of gas will occupy 3 times more volume than 1 mole of gas.

3 moles⋅ 22.4 L/1 mole=67.2 L

Likewise, 0.5 moles will occupy half the volume 1 mole occupies

0.5 moles⋅ 22.4 L/1 mole=11.2 L

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The diffusion coefficient is 4.39x10-12 m2/s.

Given information;

Initial nitrogen concentration, c₀ = 0.08 wt %

Nitrogen concentration to be achieved, cₙ = 0.52 wt %

Diffusion coefficient, D = 9.10E-05 m²/s

Temperature, T = 1100 K

Activation energy, Qd = 168 kJ/mol

Gas constant, R = 8.31 J/mol K

To find;

Diffusion coefficient at 1100 K using Arrhenius equation;

The Arrhenius equation for diffusion coefficient is given as;

D = D₀ exp(-Qd / R T)

where; D₀ is the diffusion coefficient at an infinite temperature.

Substituting the given values of D, Qd, R, and T into the equation above;

D = 9.10E-05 m²/s

Qd = 168 kJ/mol

R = 8.31 J/mol

KT = 1100 K

At 1100 K, the value of kT is;

kT = R T

     = 8.31 J/mol K x 1100 K

     = 9141 J/mol

Multiplying by Avogadro's number to get the value in J;

9141 J/mol x (6.022 x 10²³) / (1 mol) = 5.50 x 10²⁹ J-1

                                                          = 5.50 x 10²⁹ m²/kg

Multiplying by the Boltzmann constant to get the value in m²/s;

K = 1.38 x 10⁻²³ J/KD₀ can now be obtained by rearranging the Arrhenius equation as;

D₀ = D / exp(-Qd / R T)

Substituting the values into the equation;

D₀ = 9.10E-05 m²/s / exp(-168 x 10³ J/mol / 8.31 J/mol K x 1100 K)D₀

     = 9.10E-05 m²/s / exp(-21.36)D₀

     = 9.10E-05 m²/s / 1.29E-09D₀

     = 7.05E-04 m²/s

Therefore, the diffusion coefficient at 1,100 K if k = 8.31 is;

D = D₀ exp(-Qd / R T)D

   = 7.05E-04 m²/s exp(-Qd / R T)D

   = 7.05E-04 m²/s exp(-168 x 10³ J/mol / 8.31 J/mol K x 1100 K)

D = 7.05E-04 m²/s exp(-21.36)D

   = 4.39 x 10⁻¹² m²/s

Therefore, the correct option is 4.39x10-12 m2/s.

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Answer:

D. rhyolite, eclogite, perovskite, stishovite

Explanation:

The crust is the outermost layer of the Earth, which consists of sedimentary rocks. Beneath this layer is the Earth mantle, which is a thick, moving mass of silicate rocks between the crust and the outer core.

In conclusion, it is expected to find rocks and minerals from the crust to the lower mantle in the following order: rhyolite, eclogite, perovskite and stishovite.

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Answer:

Explanation:

given mass on earth =98 kg

gravitational pull on mars =3.711 m/s2

gravitational pull on venus =8.87 m/s2

weight of the body on mars =weight on earth/9.81 m/s2 *3.711 m/s2

W=98 kg*3.711 /9.81m/s2

W=37.07 kg

weight on the venus =weight on earth*8.87 m/s2 /9.81 m/s2

W= 98 kg*7.87 m/s2/9.81 m/s2

W=78.62 kg

Answer:

oil floats on water because it is heavier than water

Salt is no longer visible after stirring as salt dissolves in water

by filtration

Answer:

The chemical reaction between 2A group elements and 7A group elements is vigourous and a strong ionic bond is formed.

Explanation:

Calcium flouride has a high melting and boiling point because the chemical reaction between 2A group elements and 7A group elements is vigourous and a strong ionic bond is formed . To break these ionic bonds we require a lot of energy that is the reason why the calcium flouride has high melting and boiling point.

Hope it helped!

Answer:

They have two valence electrons and enter into reactions where they can donate their two valence electrons

Explanation:

Here, we want to predict the number of valence electrons

The elements belong to the group 2 of the periodic table

Elements in the periodic table are placed in groups based on the number of valence electrons they have

It is expected that elements in group 2 of the periodic table have 2 valence electrons

Their reactivity is that, they react with other atoms by donating this two valence electrons. They then achieve the electronic configuration of the noble gas in the last period

The name for a mixture of disrupted cells or tissues is homogenate. The correct answer is option 2.

A homogenate is a mixture that is created when cells or tissues are mechanically disrupted, resulting in a suspension of cell fragments and cell constituents. The purpose of creating a homogenate is to release the contents of the cells, such as proteins, DNA, and other molecules, so that they can be studied or used for further experimentation.

It is important to note that the other options listed are not correct. Supernatant is the liquid portion of a mixture that is left after the solid portion has been removed by centrifugation.

Proteome refers to the entire set of proteins that are produced or modified by an organism or system. Solution is a homogeneous mixture of two or more substances. And precipitate is the solid portion of a mixture that is left after the liquid portion has been removed by centrifugation.

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First, we write down our reaction:

N2 + 3H2 → 2NH3

Don't forget to balance it.

We only use moles as units.

Procedure:

3 x 1 mole H2 ------------ 2 x 1 mole NH3

3.1 moles H2 ------------- x

x = 2.1 moles NH3 are produced

Answer: 2.1 moles NH3

If the hydrogen gas is combusted and produces 645L of water vapor at 400 kelvin and 1.75 atm, 2796.96 g mass of the zinc is produced .

Using the ideal gas law equation:

PV = nRT

n = (PV) / (RT)

= (1.75 atm * 645 L) / (0.0821 atm·L/(mol·K) * 400 K)

= 42.71 moles

the balanced equation for the reaction between zinc and hydrochloric acid:

Zn + 2HCl -> \(ZnCl_{2}\)  + \(H_{2}\)

1 mole of zinc produces 1 mole of hydrogen gas. Therefore, the moles of zinc are also 42.71.

The molar mass of zinc is 65.38 g/mol.

Mass of zinc = moles of zinc * molar mass of zinc

= 42.71 moles * 65.38 g/mol

= 2796.96 g

Therefore, the mass of the zinc is 2796.96 grams.

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Answer:

don't know sorry

Explanation:

(-_-)

Ionic compounds include at least 1 metal because metals need to donate electrons. (In ionic bonds one compound takes electrons, therefore you need a metal to donate electrons).

Otherwise, with two non-metals the compounds would likely share electrons.

Answer:

Law of Conservation Matter

Answer:

0.56kg=?mg

0.56kg x (1000 g/1kg) X (1000mg/1g) = 560,000mg

Explanation:

You got it right. Great Job!

Answer:

  11. 1, 4.5

  12. right; 4.5 > 1

  13. 10, 3

  14. left; 10 > 3

Explanation:

All you're being asked to do is count the squares in the pictures.

11. The number of squares for the left wave from bottom to top is 2, so the amplitude is 1/2 that, 2/2 = 1. For the right wave it is 9 squares from bottom to top, so the amplitude is 9/2 = 4.5.

  left amplitude: 1, right amplitude: 4.5

__

12. The right wave has greater amplitude. Evidence: 4.5 > 1. It also takes up more vertical space in the picture.

__

13. It is difficult to determine the wavelength of the left wave, because two full peaks are not shown. If we try to match corresponding points, they appear to be about 10 squares apart.

The right wave has 2 peaks in 6 squares, so about 3 squares between peaks.

  left: wavelength 10, right: wavelength 3

__

14. The left wave has greater wavelength. Evidence: 10 > 3.

Answer:

11. 1, 4.5

12. right; 4.5 > 1

13. 10, 3

14. left; 10 > 3

Explanation:

Answer:

Explanation:

The kinetic energy of an object can be found by using the formula

\(k = \frac{1}{2} m {v}^{2} \\ \)

m is the mass

v is the velocity

From the question we have

\(k = \frac{1}{2} \times 1500 \times {40}^{2} \\ = 750 \times 400 \\ = 300000 \\ \\ \\ \\ = 3.0 \times {10}^{6} \: \: joules\)

Hope this helps you

Answer:0

Explanation:

Answer:

This involves negatively charged particles (electrons) jumping to positively charged objects. When you rub the balloons against the fabric they become negatively charged. They take some of the electrons from the fabric and leave them positively charged.

Explanation:

Negative charges attract to positive charges. If a balloon is not rubbed with the wool cloth, it has an equal amount of negative to positive charges, so it will attract to a rubbed balloon. When both balloons are rubbed with the wool cloth, the both receive negative charges, so they will repel each other.