which substance will have the highest surface tension? a) ph3 b) ash3 c) nh3

Answer:

there are 12 atoms in 12 sodium bromide

According to the concept of Avogadro's number, there are 0.702×10²³ atoms in 12 NaBr.

Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.

It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .

According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.

Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number, substitution of values in formula gives number of atoms= 12/102.89×6.023×10²³=0.702×10²³.

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The physical quantity used to qualitatively assess if a reaction is endothermic or exothermic in calorimetry is heat.

Measurements of heat transferred to or from a substance are determined using calorimetry.

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The physical quantity used to qualitatively assess if a reaction is endothermic or exothermic in calorimetry is heat.

Measurements of heat transferred to or from a substance are determined using calorimetry.

Characteristics of endothermic reaction:

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The following statements on HPLC modes are true is more polar compounds elute first in normal-phase HPLC (Option E).

The liquid chromatography (HPLC) is a technique in analytical chemistry employed for the separation, identification, and quantification of elements. It is considered a highly sensitive method, and it works by separating the components in a mixture with the assistance of a solvent under high pressure.

There are two modes of HPLC: Reversed-Phase HPLC (RP-HPLC) and Normal-Phase HPLC (NP-HPLC). In RP-HPLC, a nonpolar stationary phase, such as C18, is used, and polar solvents, such as water, are used as mobile phases. Polar stationary phases, such as silica gel, are used in NP-HPLC, while nonpolar solvents, such as hexane, are used as mobile phases.

More polar compounds have a greater affinity for the polar stationary phase than less polar compounds, which have a higher affinity for the nonpolar mobile phase in NP-HPLC. As a result, less polar compounds elute first in normal-phase HPLC.

Thus, the correct option is E.

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Advantages: Offshore wind speeds tend to be faster than on land. Small increases in wind speed yield large increases in energy production: a turbine in a 15-mph wind can generate twice as much energy as a turbine in a 12-mph wind. Faster wind speeds offshore mean much more energy can be generated.

Answer:

In the order goin left to right:

kinetic energy, grav pot. energy, deceleration, speed, acceleration, potential

Explanation:

Answer:

500ml

Explanation:

because 100 ×2 is 200 and the 300

500ml

Answer:

False unless you add something else with the like the common sugar ice and salt science project.

Explanation:

Answer:

No

Explanation:

No, mixing salt and sugar is not a chemical reaction. Chemical reactions result in the change of chemical composition of one or more substances(it is no longer able to be turned back to normal

Inhaled allergies will have the slowest onset time in an allergic reaction.

Inhaled allergies are also known as delayed-type hypersensitivity of allergic reactions because they occur after at least 24 hours of exposure to an allergen.

These reactions usually occur 48 to 72 hours or more to get exposure after contact with the allergen. Respiratory allergies are the most common type of allergy. Symptoms may include:

Many people with inhaled allergies only have symptoms at certain times of the year. Pollen, grass, and mold are the most common triggers for seasonal allergies.  

Many types of airborne allergens are prevalent indoors.  

Many long-term infectious diseases, such as tuberculosis and fungal infections are its examples.

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Bond breaking is exothermic if more energy is released when we break the bond.

We know that a bond is able to hold two or more atoms together. Thus when a bond must be supplied with energy if we want to break the bond. Given that a bond can only be broken when we apply energy to it, we also have to consider the energy difference between the breaking and the making of the bond.

If the energy that is released at the breaking of the bond is higher than the energy that is required to make the bond then the process of the breaking of the bond is exothermic.

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Answer:

CuCl2 + 2NaNO3 → Cu(NO3)2 + 2NaCl

Explanation:

m(NaCl) =m(CuCI2) × 2Mr(NaCl) / Mr(CuCI2)

= 15 × 2 × (94/135)

=20.89 g

Answer: True

Explanation: Its been around since 1561–1626 buddy.

Among the given compounds, CO₂ is a compound that is not ionic.

In this question, we have been given four compounds - CaCl₂, CO₂, (NH₄)₂O, and NaI and among these four compounds, we have to tell which compound is not ionic.

A compound can be ionic or covalent. And the compound which is not ionic is also called a covalent compound.

So let us comment on each compound one by one.

CaCl₂ - It is an ionic compound because it is a compound formed between a metal and a non-metal. As a general rule, any compound formed between a metal and a nonmetal is called an ionic compound and a compound between a nonmetal and a nonmetal is called a covalent compound.

(NH₄)₂O - Though this is a compound containing no metallic element, it is still an ionic compound.  NH₄⁺ is an ion, though still a nonmetal. We should remember that NH₄ compounds are exceptions to this rule. All compounds of NH₄ are actually ionic. Hence (NH₄)₂O is an ionic compound.

NaI - It is again a compound made of a metal and a nonmetal. Hence, according to the rule stated above, it is an ionic compound.

CO₂ - It is a compound made of a nonmetal and a nonmetal. Therefore, it is a covalent compound

Hence, among the above-given compounds, CO₂ is a covalent compound.

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Beryllium, the first element in group 2, has an atomic number of 4. The second element in this group has an atomic number of 12.

In the field of chemistry, atomic number can be described as the number of protons that is present in the nucleus of an atom.

The atomic number of Beryllium is 4 as it has 4 protons in its nucleus.

The second member of the group 2 elements in the periodic table is Magnesium. Magnesium has an atomic number of 12 because it has 12 protons in its nucleus.

The atomic number is represented by the letter Z usually. The atomic number is usually mentioned in a periodic table at the top-left.

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The biological risk for the first person than the second as a result of radiation weighting is 10 times.

As stated in the question, radiation weighting factor (q) is the ability to transfer energy to the body.

If radiation factor of proton = 2, and radiation factor of alpha particles = 20.

Risk of first person with respect to second person = 20/2 = 10 times higher

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Answer:

10

Explanation:

Answer:

True

Explanation:

The current that leaks through protective ground conductor and goes to ground is known as leakage current. When a grounding link is not present

Current can simply flow through a conductor. Insulators prevent the flow of current through them. Conductors have an electric charge on their surface. Powerful cha

The components or elements that permit electricity can flow through them are known as conductors. Conductors also permit the passage of heat via them. Animals, the Earth, metals, and the human body are all examples of conductors. A powerful conductor, the human body.

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Answer:

Because of the summer season

Explanation:

The water in the dish which is uncovered will evaporate faster as compared to the one which is

covered. This is because the air above the uncovered dish has less water vapour over it as

compared to the one which is covered. The covered dish has good amount of moisture over it as

the closed lid does not allow the moisture to come in direct contact with air.

the final volume of air in the balloon  when the balloon is taken to a depth of 10ft in a swimming pool, where the pressure is 981 torr is 10.8 L. Answer: d) 10.8 L.

We are given the initial volume of air in the balloon, Vi = 14.0 L. The initial pressure, Pi = 760 torr. The final pressure, Pf = 981 torr. The depth of the swimming pool, h = 10 ft. The temperature of the air, T is constant, which means that the gas in the balloon is an ideal gas.

We can use Boyle's law and the pressure difference to find the final volume of air.Boyle's law states that at a constant temperature, the volume of a gas is inversely proportional to its pressure. That is,V_1/P_1 = V_2/P_2where V1 and P1 are the initial volume and pressure, and V2 and P2 are the final volume and pressure.

Rearranging this equation, we getV_2 = V_1 × P_1/P_2= 14.0 L × (760 torr)/(981 torr)= 10.8 L

Therefore, the final volume of air in the balloon is 10.8 L. Answer: d) 10.8 L.

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Option E is Answer. The pH value of the buffer is 9.08

The pH of a solution: It is a measure of hydrogen ion concentration, which in turn is a measure of its own acidity. Pure water dissociates slightly into equal concentrations of hydrogen and hydroxyl (OH−) ions.

The pH is then calculated using the expression:

pH = - log [OH-].-------------(1)

the pH of acidic buffer =pka+log[ acid/salt]

the pH of basic buffer =pkb+log[ base/salt]

Given that Kb=1.8x10^-5

                 base=0.27M

                 salt=0.18M

first, we have to calculate the value of kb,

pkb=−log[1.8×10 ^−5]

pkb=4.74

The pH of buffer=pkb+log[base/salt]-------------(2)

We find out the value of kb and now substitute it in equation(2)

pOH=4.74+log[ 0.27/0.18]

​=4.74−0.176=4.92

pH=14−4.92=9.08

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The elements Bromine(Br) and Sulphur(S) undergo changes in oxidation number in the given reaction.

Given reaction:

\(2H_2SO_4(aq) + 2NaBr(s) - > Br_2(l) + SO_2(g) + Na_2SO_4(aq) + 2H_2O(l)\)

The elements that undergo changes in oxidation number are:

Bromine (Br):

In NaBr, the oxidation number of Br is -1.

In \(Br_2\), the oxidation number of Br is 0.

Sulfur (S):  

In \(H_2SO_4\), the oxidation number of S is +6.

In \(SO_2\), the oxidation number of S is +4.

All other elements in the reaction (H, O, Na) maintain a consistent oxidation number throughout the reaction.

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Water normally freezes at 0°C because the thermal energy of the water molecules decreases to the point where they form stable, organized structures known as ice. However, when foreign molecules or ions are present in the water, they can disrupt the formation of these structures and prevent the water from freezing at 0°C.

Foreign molecules or ions can act as impurities in the water, altering its physical properties such as freezing point and boiling point. When these impurities are dissolved in the water, they can form weak bonds with the water molecules, reducing the overall energy required to break the bonds between the water molecules and allowing the water to remain liquid at temperatures below 0°C. This effect is known as freezing point depression.

The degree of freezing point depression depends on the concentration of the impurities in the water. The more impurities there are, the greater the depression of the freezing point. Therefore, water with higher levels of impurities will freeze at lower temperatures than pure water.

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Answer:

Make Recycle Bins Easily Accessible

Ditch Single-Use Waste

Minimise Paper Waste

Designate a Drawer for Scrap Paper

Eco-Friendly Lunches

Answer:

Air and Water Temperature Increases

An increase in the air temperature will cause water temperatures to increase as well. ... Lower levels of dissolved oxygen due to the inverse relationship that exists between dissolved oxygen and temperature. As the temperature of the water increases, dissolved oxygen levels decrease.

The correct answer is CARBON.

The element carbon has three isotopes: one with an atomic mass of 12, one with an atomic mass of 13, and one with an atomic mass of 14.

Carbon is used in some way in almost every industry in the world. It is used for fuel in the form of coal, methane gas, and crude oil.

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Answer:

300.06 grams of glucose can be produced from a photosynthesis reaction that occurs using 10 moles of carbon dioxide.

Explanation:

Answer:

a process called predominate?

Answer:

the lining of the mouth

Explanation:

its in their predominate form

Answer:

1,354

Explanation:

A mixture of gases contains 12. 0 grams of n2 and 15. 0 grams of ar, under a total pressure of 1. 32 atm. What is the partial pressure of n2?.

The partial pressure of n2 in the mixture of above gases is 0.7atm.

What is partial pressure?

Each gas in a mixture of gases has a partial pressure, which is the pressure that would exist if that gas alone had filled the complete volume of the original mixture at the same temperature.

N=12.0, Ar=15.0

Total pressure=1.32

Partial pressure of n2=?

WN2=12.0

WAr =15.0

nN2=12/28 =0.42

nAr=15/40 =0.37

Xn2=0.42/0.42+0.37 =0.53

Pn=Xn2×Ptotal

=0.53×1.32=0.69atm that ie nearly equal to 0.7atm

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Answer:

E

Explanation: