What special
properties does
hydrogen bonding give
to water?

Answer:

a) gold - Solid

b) gasoline - liquid

c) oxygen - gaseous

d) olive oil - liquid

e) mercury (found in thermometers) - liquid

f) aluminum - solid

Explanation:

Matter exists in three states viz: solid, gas and liquid. Note that, room temperature is a neither hot or cold temperature, which is about 20-23°C.

A) Gold is a transition metal with the symbol Au. At a room temperature, Gold, like most metals are found as SOLIDS.

B) Gasoline is a liquid mixture of refined hydrocarbons majorly used as fuels.

C) Oxygen is a chemical element with symbol O. It is a constituent of natural air, which is a mixture of different gases including oxygen. Hence, at room temperature, Oxygen is a gas.

D) Olive oil is a vegetable oil got from olives. It is composed of fats and it's a liquid at room temperature.

E) Mercury is an element with symbol Hg. It is the only metallic element found naturally (at room temperature) as a liquid. It is used in thermometers.

F) Aluminum is another chemical element with symbol Al. It is a lustrous metal that occurs as a Solid in room temperature.

Answer:

Explanation:

1).  Ca(NO₃)₂ + KI → CaI + K(NO₃)₂

    This equation is incorrect.

    When Ca⁺⁺ reacts with I⁻, final product is CaI₂

    And when K⁺ react with NO₃⁻, final product is KNO₃

    Hence the equation will be,

    Ca(NO₃)₂ + KI → CaI₂ + KNO₃

    Now we have to balance this equation.

     Ca(NO₃)₂ + 2KI → CaI₂ + KNO₃

                          ↓

     Ca(NO₃)₂ + 2KI → CaI₂ + 2KNO₃

2). Ca(NO₃)₂ + KOH → CaOH + K(NO₃)₂

    This equation is incorrect,

    Since the reaction of Ca⁺⁺ with OH⁻ gives the final product     Ca(OH)₂

    And final product of K⁺ and NO₃⁻ is KNO₃

    Therefore, the equation will be,

    Ca(NO₃)₂ + KOH → Ca(OH)₂ + KNO₃

    Now we will balance this equation by changing the coefficients of the      molecules until the number of atoms on both the sides become equal.

    Ca(NO₃)₂ + KOH → Ca(OH)₂ + 2KNO₃

                                ↓

     Ca(NO₃)₂ + 2KOH → Ca(OH)₂ + 2KNO₃

3). Ca(NO₃)₂ + Na₂C₂O₄ → CaC₂O₄ + 2Na(NO₃)₂

    This equation is incorrect,

    Since the reaction of Na⁺ and NO₃⁻ gives the final product    NaNO₃.

    Therefore, the correct equation will be,

    Ca(NO₃)₂ + Na₂C₂O₄ → CaC₂O₄ + 2NaNO₃

     This equation is in the balanced form.

Answer: The concentration of hydrogen ion is 2.5 x 10∧-3.

Explanation:

It is well known that; pH + pOH = 14

∴ pH + 11.40 = 14

  pH = 14 -11.40 = 2.60

Remember that,

pH = - Log [ H+ ]

2.60 = - log [H+]

To get the  hydrogen ion concentration, we take the anti-log of 2.60.

[H+] = Antilog 2.60 = 2.5 x 10∧-3.

(CH3)2CHCN compound would be expected to show intense IR absorption at 2250 cm⁻¹.

The intensity of IR vibration will be directly proportional to the magnitude of change in dipole moment during the molecular vibration.

Here, it is given that IR absorption is at 2250 cm⁻¹. This is typical vibration for C-N stretch, hence the compound will have -C-N group. Hence, the correct answer will be (CH3)2CHCN.

➤ In general, the interaction between the IR electric field vector and the molecular dipole transition moments associated with the molecular vibrations is what causes IR absorption. When the electric field vector and the dipole transition moment are parallel to one another, absorption is at its highest level.

By analyzing characteristic absorbances and comparing them to spectral libraries, one can use the IR spectrum of an organic compound to determine unknowns. Due to its sensitivity and selectivity, IR spectroscopy is also utilized in quantitative techniques.

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Answer:

C. 1 cubic foot of loose sand

Explanation:

For many  objects having equal volume , surface area will be maximum

of the object which has spherical shape .

But when a sphere is broken into tiny small spheres , total surface area of all the small spheres will be more than surface area of big sphere .

Hence among the given option , surface area of loose sand will have greatest surface area . Loose sand is equivalent to small spheres .

Answer:

the answer would be C 1 cubic foot of loose sand.

Answer:

Compounds

Explanation:

All compounds of a substance shares chemical bonds between them and their structures.

The bonds can come in different forms. Compound are held by chemical bonds within their atoms.

It represents the time it takes for half of the material to decay to a daughter element.

The half-life of a radioisotope represent the time it takes for half of the material to decay to a daughter element (Option B)

This is the time taken for half a material to decay. The longer the half-life of an element, the more stable the element.

If the initial mass of an element is 100 g and after a particular time (say 72 minutes) the mass of the element is now 50 g.

Therefore, the time 72 minutes is called the half-life of the element because that is the time taken for half the element to decay.

With the above information in mind, we can conclude that the correct answer to the question is:

Option B. It represents the time it takes for half of the material to decay to a daughter element.

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Mass of n-butane is 72.008kg and the moles is 3.7.

This question requires the use of the ideal gas law and the information given in the problem to determine the mass of n-butane vapor in the tank. The Ideal Gas Law is a fundamental equation used in physics and engineering to describe the behavior of an ideal gas, which is a theoretical type of gas that consists of large numbers of point-like particles with no intermolecular interactions. The law states that the pressure, volume, and temperature of an ideal gas are directly proportional to each other. It is expressed where P is pressure, V is volume, n is the number of moles of the gas, R is the universal gas constant, and T is the temperature in Kelvin. The Ideal Gas Law is widely used in various fields, including thermodynamics, atmospheric science, and combustion engineering. To solve this, you would first need to calculate the number of moles of n-butane in the tank using the volume and ideal gas law. Then, you would use the molar mass of n-butane to convert the number of moles to mass in kilograms.

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Answer:

Combustion reaction

Explanation:

Combustion reactions always form water and CO2.

The reaction that occurs most rapidly at standard conditions is option (e) Ag⁺(aq) + I⁻(aq) → AgI₂(s), as it has very low activation energy.  

The activation energy, temperature, and reactant concentrations are a few of the variables that affect a chemical reaction's rate. But under normal circumstances, the rate of a reaction is solely determined by its mechanism and activation energy.

In this situation, we can identify which reaction happens more quickly under typical conditions by using the reaction mechanism and activation energies.

a. H₂(g) + I₂(s) → 2HI(g)

There is a radical mechanism at work in this gas-phase reaction. Since this reaction has a relatively large activation energy, it proceeds slowly under normal circumstances.

b. Cu(s) + S(s) → CuS(s)

This reaction occurs in the solid state and is carried out by a surface mechanism. Since this reaction has a low activation energy, it proceeds quickly under normal circumstances.

c. C₆H₁₂O₆(s) + 6O₂(g) → 6CO₂(g) + 6H₂O(g)

This gas-phase reaction moves forward by means of burning. Since this reaction has a relatively large activation energy, it proceeds slowly under normal circumstances.

d. 5C₂O₄²⁻(aq) + 2MnO₄⁻(aq) + 16H⁺(aq) → 10CO₂(g) + 2Mn⁺(aq) + 8H₂O(l)

An oxidation-reduction mechanism drives this solution-phase process. Since this reaction has a relatively large activation energy, it proceeds slowly under normal circumstances.

e. Ag⁺(aq) + I⁻(aq) → AgI₂(s)

It is a precipitation mechanism that drives this solution-phase reaction. Since this reaction has a low activation energy, it proceeds quickly under normal circumstances.

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Answer: There are 0.00054 moles of silane gas (SiH4) are present in 8.68 mL measured at 18 0C and 1.50 atm.

Explanation:

Given: Volume = 8.68 mL (1 mL = 0.001 L) = \(8.68 \times 10^{-3} L\),    

Temperature = \(18^{o}C = (18 + 273) K = 291 K\),

Pressure = 1.50 atm

The ideal gas formula is as follows.

PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into above formula as follows.

\(PV = nRT\\1.50 atm \times 8.68 \times 10^{-3} L = n \times 0.0821 L atm/mol K \times 291 K\\n = \frac{1.50 atm \times 8.68 \times 10^{-3} L}{0.0821 L atm/mol K \times 291 K}\\= \frac{0.01302}{23.8911}\\= 0.00054 mol\)

Thus, we can conclude that there are 0.00054 moles of silane gas (SiH4) are present in 8.68 mL measured at 18 0C and 1.50 atm.

Answer:

Metallic bonding is the type of chemical bonding that occurs between atoms of metals. In a metallic bond, atoms share their electrons in a way that allows them to form a “sea” of free electrons. This electron sea is responsible for the unique physical and electrical properties of metals.

Explanation:

Answer:

B. allow for bonding metals to be stable.

Explanation:

edge 2022

Answer:

Elemental mercury is the most common form. It is a metallic, silvery liquid ( also referred to as quicksilver) that is processed from an ore called cinnabar. It readily breaks into droplets and easily vaporizes at room temperature into an odorless, colorless vapor that can easily be inhaled.

Explanation:

Following are the KMT's five central tenets: The particles in a gas are constantly moving at random speeds, their total volume is tiny, they do not interact with one another physically, and their collisions are entirely elastic.

Gases will depart from the ideal gas law when the Kinetic Molecular Theory's five postulates fail, and there are five postulates in total.

The relationship between a gas particle's average kinetic energy and temperature is direct. The speed at which the gas molecules move rises with temperature.

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The question is incomplete, the complete question is;

Which statement correctly compares the number of protons and electrons in atoms of rubidium (Rb) and calcium (Ca)?

Rubidium has fewer protons and fewer electrons than calcium.

Rubidium has fewer protons and more electrons than calcium.

Rubidium has more protons and fewer electrons than calcium.

Rubidium has more protons and more electrons than calcium.

Rubidium has 37 electrons and protons as well as 48 neutrons. Calcium has 20 electrons, protons and neutrons.

Rubidium is a group 1 element while calcium is a group 2 element.  Rubidium has more protons and more electrons than calcium.

Rubidium is an element in group one of the periodic table. It has 37 electrons and protons as well as 48 neutrons.

Calcium is an element in group  two of the periodic table. It has Calcium has 20 electrons, protons and neutrons.

From the foregoing, we can see that Rubidium has more protons and more electrons than calcium hence the answer.

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Answer:

ok so im gonna go and do some for your latest questions then if thats alright with you

Explanation:

i need points so im trying to help as many people as i can before the end of the day.

but you have to make the questions forst so i can help you understand them

Considering the two acids and bases involved, the reverse reaction is favored.

The term reversible reaction refers to a reaction that can go either forward or backwards depending on the conditions of the reaction.

We must recall that acetic acid is a weak acid hence the equilibrium position would always lie towards the left hand side of the equation. Hence considering the two acids and bases involved, the reverse reaction is favored.

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According to the given chemical equation and stoichiometry of it , 36 moles of H₃PO₄ are formed from 9 moles of P₄O₁₀.

It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.

As per the reaction, 1 mole of P₄O₁₀ produces 4 moles of  H₃PO₄, thus 9 moles of  P₄O₁₀ will produce 9×4=36 moles of H₃PO₄.

Thus,36 moles of H₃PO₄ are formed from 9 moles of P₄O₁₀.

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Answer:36

Explanation:

taking the class just got it right

2 C2H6 + 7 O2 → 6 H2O + 4 CO2 If you start with 5.20 moles of C2H6, 10.4 moles of H2O will produce.

The term mole is defined as the amount of substance of a system which contains as many elementary entities.

One mole of any substance is equal to 6.023 × 10²³ units of that substance such as atoms, molecules, or ions. The number 6.023 × 10²³ is called as Avogadro's number or Avogadro's constant.

The mole concept can be used to convert between mass and number of particles.

5.20 moles of ethane × 4 moles of carbon dioxide / 2 mole of ethane

= 5.20 × 4 / 2

= 10.4 moles

Thus, If you start with 5.20 moles of C2H6, 10.4 moles of H2O will produce.

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Answer:

=144a⁴−168a³b−239a²b²+168ab³+144b⁴

Explanation:

=144a⁴−168a³b−239a²b²+168ab³+144b⁴

Answer:

\((4a + 3b)(4a + 3b)(3a - 4b)(3a - 4b) \\ {16a}^{2} + 12ab + {9b}^{2} + 12ab + {9a}^{2} + 12ab + 12ab + {16b}^{2} \\ {16a}^{2} + {9a}^{2} + {9b}^{2} + {16b}^{2} + 12ab + 12ab + 12ab + 12ab \\ {25a}^{2} + {25b}^{2} + 48ab\)

Answer:

Ammonium chloride (a chemical compound) is an inorganic compound with the formula NH₄Cl and a white crystalline salt that is highly soluble in water. Solutions of ammonium chloride are mildly acidic. In its naturally occurring mineralogic form, it is known as sal ammoniac.

One possible process to separate nickel tetracarbonyl and iron pentacarbonyl is fractional distillation. Since the boiling points of the two liquids are different, the process can take advantage of this difference to separate the components.

Fractional distillation works by heating the mixture in a distillation apparatus, which causes the liquids to vaporize. The vapor is then condensed back into a liquid and collected. However, the composition of the vapor is not uniform, with more volatile components having a higher concentration.

By using a fractionating column, which contains many plates or packing material, the vapor is forced to condense and evaporate multiple times.

As the vapor travels up the column, the components with lower boiling points will vaporize and travel up more easily, while the components with higher boiling points will condense and fall back down more frequently. This process effectively separates the components based on their boiling points.

In the case of nickel tetracarbonyl and iron pentacarbonyl, the fractional distillation apparatus would be set up, and the mixture would be heated. As the vapor rises up the column, the nickel tetracarbonyl, with its lower boiling point, would vaporize and travel up the column more easily, while the iron pentacarbonyl would condense and fall back down more frequently.

The components can then be collected separately at the end of the apparatus, resulting in the separation of the two liquids.

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The discreteness of energy levels is best understood by considering the electrons to be wave like.

This above can be explained on the basis of bohr model and wave mechanical theory.

According to bohr's atomic model, the angular momentum of electron orbiting around the nucleus is an integral multiple of h/2π.

The electron in the atom moving around the nucleus of an atom. The wave mechanical theory proposes that each electron revolving an atom's nucleus occupies a specific orbital and spins in a certain direction, but the orbitals is like a wave of energy.

The wave mechanical model proposed that the electron acts like particles as well as wave of energy. According to the field around, the electron changes there path and they start moving very fast act like wave of energy and hence they are not in place during any particular time.

Thus we concluded that electron revolve around central nucleus at such high speed that they act like wave of energy.

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The entire number of valence electrons should be known. Step 2: Outline the molecule's skeletal structure. Step 3: Form each bond in the skeletal structure using two valence electrons Lewis.

The element symbol for an atom is covered in dots that represent the electrons in its valence shell, which is known as the Lewis dot structure or electron-dot symbol. A single dot represents the unpaired electron in the valence shell, whereas a pair of dots represents the paired electrons.

The number of valence e- atoms that each atom contributes to the molecule is counted when designing Lewis dot structures.

With the exception of H, which is only encircled by two electrons, place electron pairs around each atom so that there are eight electrons around each atom (octet rule).

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A chemical equation is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.

A chemical equation is said to be balanced when the number of atoms of each element on both sides of the equation are the same.

According to this question, chlorine gas reacts with pottasium iodide to produce iodine and pottasium chloride as follows:

Cl₂ + 2KI → 2KCl + I₂

Therefore, the answers to the questions are as indicated in the main answer part.

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Answer:

An aqueous solution is water that contains one or more dissolved substances. The dissolved substances in an aqueous solution may be solids, gases, or other liquids.

The twisting of the polypeptide chain is an example of the secondary protein structure level. Thus, the correct option for this question is A.

The functions of keratin protein are as follows:

The twisting of protein structures is facilitated by the action of the secondary structure. This is because these structures generally have turns, motifs, folds, etc. These small regions stimulate the twisting and folding of proteins into their functional form.

Therefore, the secondary protein structure level is an example of the twisting of the polypeptide chain. Thus, the correct option for this question is A.

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The terms that match the processes are;

1) Evaporation

2) Transpiration

3) Run off

4) Precipitation

5) Condensation

We know that the term vaporization has to do with the loss of water from the earth surface. This occurs when energy is supplied to the water molecules that are on the earth surface and they are able to break the barrier of the intermolecular forces in the liquid phase and then transition into the gas phase.

The matching of the terms is done below;

1) This is another term for vaporization, the part of the water cycle in which water changes = Evaporation

2) This is the evaporation of water from above ground parts of plants, especially from leaves = Transpiration

3) This is the movement of landwater to the oceans, mainly from rivers, lakes, = Run off

4) Rain, snow, sleet, hail. Condensed water falls back to Earth =  Precipitation

5) This is the process of water changing from a gas to a liquid.  You will see clouds forming when this happens = Condensation

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