Which formula represents a polar molecule?
C12
N2
CC14
HCI

Answer:

liquid is the right answer k

Answer:

liquid

Explanation:

Answer:

The relationship between the boxer crab and the anemone is a form of symbiosis, called mutualism.

Explanation:

The boxer crab —Lybia tesselata— receives its name because it carries anemones in its anterior claws, in the form of boxing gloves, constituting a symbiotic association of a mutual type.

Mutualism is an interspecific relationship where two individuals of different species benefit from each other.

The anemone —usually of the genus Triactis or Bunodeopsis— has tentacles capable of secreting a stinging substance that contributes to the defense of the crab against its natural predators. On the other hand, the crab helps the anemone to transport and feeds on the food remains left by the crab.

(a) Solution with [H₃O⁺]=1.8 x 10⁻⁵ mol/L is acidic

(b) Solution with [OH⁻]=3 x 10⁻³ mol/L is basic

(c) Solution containing 5 g of sodium hydroxide (NaOH) in 3 liters of solution is basic

(d) Solutionon prepared by dissolving 7.3 g of hydrochloric acid (HC) in water to give a final volume of 0.5 liter is acidic

(a) The pH can be calculated using the formula:

pH = -log[H₃O⁺]

pH = -log(1.8 x 10⁻⁵) = 4.74

Since pH is less than 7, the solution is acidic.

(b) The pH can be calculated using the formula:

pOH = -log[OH⁻]

pOH = -log(3 x 10⁻³) = 2.52

Since pH + pOH = 14, we can calculate the pH:

pH = 14 - pOH = 14 - 2.52 = 11.48

Since pH is greater than 7, the solution is basic.

(c) First, we need to calculate the concentration of NaOH in the solution:

5 g NaOH / 40.00 g/mol NaOH = 0.125 mol NaOH

0.125 mol NaOH / 3 L = 0.0417 mol/L NaOH

Now, we can use the formula for the concentration of OH⁻ in a solution of a strong base like NaOH:

[OH⁻] = [NaOH] = 0.0417 mol/L

pOH = -log[OH⁻] = -log(0.0417) = 1.38

Since pH + pOH = 14, we can calculate the pH:

pH = 14 - pOH = 14 - 1.38 = 12.62

Since pH is greater than 7, the solution is basic.

(d) We can calculate the concentration of HCl in the solution:

7.3 g HCl / 36.46 g/mol HCl = 0.2 mol HCl

0.2 mol / 0.5 L = 0.4 mol/L HCl

Now, we can use the formula for the concentration of H₃O⁺ in a solution of a strong acid like HCl:

[H₃O⁺] = [HCl] = 0.4 mol/L

pH = -log[H₃O⁺] = -log(0.4) = 0.4

Since pH is less than 7, the solution is acidic.

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A (they are experimentally determined exponents)

Answer:

Explanation:

If a zero is found between significant digits, it is significant

Answer:

Explanation:

Diagram 2! Because the polar H2O molecules can induce temporary dipoles on the electron clouds of 02 molecules.

Answer:

Br

Explanation:

because bromine is more reactive as reactivity increases on moving from left to right in p-block. hope this make sense :)

Galileo disproved the Ptolemaic theory, sanctioned for centuries by the Church, which held the Earth to be the central and principal object in the universe, about which all celestial objects orbited.

The new evidence led scientists to change their minds about the geocentric model is that the Sun and stars move across the sky in the same direction everyday. They appear to be going around the Earth. However, Galileo observed moons which orbited Jupiter. This suggests that not everything orbits the Earth and that the geocentric model is not correct.

Geocentric model is any theory of the structure of the solar system (or the universe) in which Earth is assumed to be at the centre of it all.

This model is  often named Ptolemaic model after its most famous supporter, the Greco-Roman astronomer Ptolemy.

The geocentric is often referred to as the Medieval view of the universe and it dominated thinking into the early modern age.

Therefore, The new evidence led scientists to change their minds about the geocentric model is that the Sun and stars move across the sky in the same direction everyday. They appear to be going around the Earth. However, Galileo observed moons which orbited Jupiter. This suggests that not everything orbits the Earth and that the geocentric model is not correct.

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A mouse that is homozygous for the dominant trait has the genotype AA or Aa, whereas a mouse that is homozygous for the recessive trait has the genotype aa.

In genetics, complete dominance makes reference to the expression of only one allele in heterozygous individuals for a given trait.

Complete dominance is due the dominant allele masks the expression of the recessive allele in heterozygous individuals.

In conclusion, a mouse that is homozygous for the dominant trait has the genotype AA or Aa, whereas a mouse that is homozygous for the recessive trait has the genotype aa.

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The new volume of the helium sample at 50°C and 203 kPa would be 6.16 mL.

First we need to use the ideal gas law equation:

PV = nRT

Where

To solve for the new volume, we can use the following steps:

Convert the initial temperature to Kelvin:

T = 20°C + 273.15 = 293.15 K

Use the initial conditions to calculate the number of moles of helium:

n = PV/RT = (203 kPa x 4.5 mL) / (8.314 J/(mol·K) x 293.15 K) = 0.00073 mol

Use the new conditions to solve for the new volume:

V = nRT/P = (0.00073 mol x 8.314 J/(mol·K) x (273.15°C + 50°C)) / 203 kPa = 6.16 mL

Therefore, the new volume of the helium sample at 50°C and 203 kPa would be 6.16 mL.

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The decomposition of aspirin (acetylsalicylic acid,\(C_{9} H_{8} O_{4}\)) can occur through the hydrolysis reaction, resulting in the formation of acetic acid (\(CH_{3} COOH\)) and salicylic acid (\(C_{7} H_{6}O_{3}\)).

The decomposition of aspirin (acetylsalicylic acid, \(C_{9} H_{8} O_{4}\)) can occur through the hydrolysis reaction, resulting in the formation of acetic acid (\(CH_{3} COOH\)) and salicylic acid (\(C_{7} H_{6}O_{3}\)). To determine the moles of each product formed, we need to consider the balanced chemical equation for the reaction:

\(C_{9} H_{8} O_{4} = > C_{7} H_{6}O_{3} +CH_{3} COOH\)

From the equation, we can see that for every 1 mole of aspirin, 1 mole of salicylic acid and 1 mole of acetic acid are produced.

Therefore, the moles of salicylic acid and acetic acid formed will be equal to the number of moles of aspirin that decomposes. If we know the amount of aspirin in moles, we can directly calculate the moles of each product based on stoichiometry.

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When comparing various liquids, a liquid can be recognized by its behavior on paper, which is a defining attribute of the liquid.

On two distinct paper surfaces, we will test four known liquids and an unknown liquid. we will identify an unidentified liquid using their observations. We will learn that we can effectively identify an unidentified liquid by combining the findings of two experiments. On a coffee filter dipped in green food coloring, we will also add water and salt water. we can tell a big difference in how each liquid separates the hues of the green food coloring. When comparing various liquids, a liquid can be recognized by its behavior on paper, which is a defining attribute of the liquid. The equal quantity of each liquid should be applied to the paper in the same location for the test to be fair.

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Answer:

Alcohol?

Explanation:

(for Plato)

Deuterium (D, or 2H), also known as heavy hydrogen, is an isotope of hydrogen that has a nucleus made up of one proton and one neutron and has a mass twice that of regular hydrogen's nucleus (one proton). The atomic weight of deuterium is 2.014.

Isotopes are atoms with the same number of protons but different numbers of neutrons. They differ in mass, which affects their physical characteristics even though they have nearly identical chemical properties.

The most prevalent element in the universe, hydrogen, has isotopes called deuterium and tritium. All hydrogen isotopes have one proton, but tritium and deuterium also have one neutron each, making their ion masses heavier than those of protium, the only hydrogen isotope without a neutron.

Thus, deuterium,the hydrogen isotope with a mass of 2 amu, to emit light at the same wave lengths as hydrogen.

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ANSWER

KCN is an electrolyte

EXPLANATION:

Firstly, we need to define electrolyte

An electrolyte is a substance that conducts electricity when dissolved in water. An electrolyte is a medium containing ions that are electrically conducting through the moving ions.

A good electrolyte includes soluble salts, acids, bases that dissolved in a polar solvent

Note that, all group one elements are soluble and potassium is a group one element

When KCN is dissolved in water, it dissociates into the following ions

Hence, KCN is a good and strong electrolyte because of its strongly basic nature, and also, it is soluble in water.

Answer:

Heat the molecule

Explanation:

Since most bonds require energy to form, they also give off energy when they are broken. But before most bonds break, the molecule has to be heated. Then the atoms start to move, and when they move too much, the bond breaks. Molecules that require less energy to break than they give off when broken are called fuels.

Kc = [H3O+][HCO3-] / [H2CO3]

Remember that Kc is products over reactants. Also, you do not include liquid water in a Kc expression, since liquid water has no concentration.

Taking into account the definition of avogadro's number,  the correct answer is option D. 5.42×10²⁴ ions of Na⁺ are found in 3 moles of Na₃PO₄.

An ionic bond is produced between metallic and non-metallic atoms, where electrons are completely transferred from one atom to another. During this process, one atom loses electrons and another one gains them, forming ions: the metal atom becomes a positive ion (called a cation) and the non-metallic atom becomes a negative ion (called an anion).

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

In this case, you have 3 mol of Na₃PO₄.

Subscripts indicate the amount of moles of iones present in the ionic compound.

In this case, 1 mole of the compound has 3 moles of Na⁺ and 1 moleof PO₄³⁻. So, in 3 moles of Na₃PO₄ you have 9 moles of Na⁺ and 3 moles of PO₄³⁻.

Then you can apply the following rule of three, considering the Avogadro's Number: if 1 mole of of Na⁺ contains 6.023×10²³ ions, 9 moles of Na⁺ contains how many ions?

\(amount of ions of Na^{+} =\frac{9 moles x 6.023x10^{23}ions }{1 mole}\)

amount of ions of Na⁺= 5.42×10²⁴ ions

Finally, the correct answer is option D. 5.42×10²⁴ ions of Na⁺ are found in 3 moles of Na₃PO₄.

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Answer:

a. The Zn and HCl both retained their identity.

Answer:

0.551 moles

Explanation:

To calculate the number of moles in 22 grams of argon, divide the mass by the molar mass:

Number of moles = Mass / Molar mass

Number of moles = 22 g / 39.95 g/mol

Number of moles ≈ 0.551 moles

Therefore, there are approximately 0.551 moles of argon in 22 grams of argon.

In order to react with 45 g of water 1.25 moles of CaC₂ are required. Explanation: Given data: Moles of CaC₂ needed = ? Mass of water = 45.0 g.

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The general equation for this reaction is as follows: CO3^2- + 2H+ → CO2 + H2O.

The test for trioxocarbonate (IV), also known as carbonate (CO3) ions, involves the reaction with an acid. When carbonate ions react with an acid, carbon dioxide gas (CO2) is produced, which can be observed through effervescence or bubbling. The general equation for this reaction is as follows:

CO3^2- + 2H+ → CO2 + H2O

In this equation, CO3^2- represents the carbonate ion, and H+ represents the hydrogen ion from the acid. The reaction produces carbon dioxide gas (CO2) and water (H2O).

For example, if hydrochloric acid (HCl) is used in the test, the reaction equation would be:

CO3^2- + 2HCl → CO2 + H2O + 2Cl-

In this case, the carbonate ions react with hydrochloric acid to produce carbon dioxide gas, water, and chloride ions.

It's important to note that the specific acid used in the test may vary depending on the experimental setup. Common acids used include hydrochloric acid (HCl), sulfuric acid (H2SO4), or acetic acid (CH3COOH).

The reaction equation remains the same, with the acid being consumed in the reaction and contributing to the formation of water and an anion corresponding to the acid used (such as chloride, sulfate, or acetate ions).

By observing the effervescence or bubbling produced during the reaction, we can confirm the presence of carbonate ions in the sample being tested.

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Answer:

0.56

Explanation:

From the formula;

0.693/t1/2 = 2.303/t log (Ao/At)

t1/2 = half life of the C-14 = 5730 y

t = time elapsed = 4800 y

At = Activity of C-14 at time t

Ao= Activity of a living C-14 sample

0.693/5730 = 2.303/4800 log (Ao/At)

1.2 * 10^-4 = 4.8 * 10^-4 log (Ao/At)

log (Ao/At) = 1.2 * 10^-4/4.8 * 10^-4

log (Ao/At) = 0.25

Ao/At = Antilog (0.25)

Ao/At = 1.778

Hence;

At/Ao = (1.778)^-1

At/Ao = 0.56

The answer is 0.56, for the cotton that is 4800 years old and has a similar quality like those of today.

The plant has grown in today in a relative ratio of radioactivity in the old matter vs the relative amount of radioactivity in the new matter. The half-life for which in given as 14C is 5730 y.

As per the formula 0.693/t1/2 = 2.303/t log (Ao/At)

t1/2 = half life of the C-14 = 5730 y, t = time elapsed = 4800 y

At = Activity of C-14 at time t Ao= Activity of a living C-14 sample

0.693/5730 = 2.303/4800 log

(Ao/At) 1.2 * 10^-4 = 4.8 * 10^-4 log (Ao/At)

Thus At/Ao = 0.56.

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Sodium carbonate, often referred to as Na2CO3, is a chemical compound composed of atoms of sodium (Na), carbon (C) and oxygen (O).

It is also sometimes called washing soda or soda ash. At room temperature, sodium carbonate is a white, crystalline solid that is very soluble in water. According to the chemical formula of the sodium carbonate molecule, Na2CO3, each molecule consists of two sodium atoms (Na), one carbon atom (C) and three oxygen atoms (O). The atomic configuration in sodium carbonate is shown in the given diagram.

A trigonal planar arrangement is formed when the central carbon atom is bonded to three oxygen atoms. The structure of sodium carbonate is completed by two sodium atoms joined to oxygen atoms.

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Option C tert-butanol, Kf = -9.1. is the correct answer. Tert-butanol, Kf = -9.1 will achieve the largest change in freezing point.

Tert-butanol is an alcohol with a hydroxyl group substituted at position 2 in the tertiary alcohol isobutane. It serves as a xenobiotic metabolite for humans. It comes from an isobutane hydride. There is information on the natural substance tert-butanol, which is found in Psidium guajava. Tert-butyl alcohol has a strong alcohol odor and is an oily, colorless liquid. mixes and floats in water. produces obnoxious vapor. 78 °F is the freezing point. (USCG, 1999). The compound's canonicalized name is 2-methylpropan-2-ol, and its atomic weight is 74.12 with 5 heavy atoms.

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Complete Question

When 2.36g of a nonvolatile solute is dissolved in 100g of solvent, the largest change in freezing point will be achieved when the solvent is            .? options (A) paradichlorobenzene, kf=7.10. (B). water, Kf=1.86. (C). tert-butanol, Kf=9.1. (D) All are expected to have the same freezing point.

Answer:

mook passes between the earth and sun