HELP FAST PLZ!!!!! Which phase change allows a substance to transform from a liquid to a
gas?
melting
Ofreezing
O ionization
condensation
deionization
O
evaporation
sublimation

The formation of 46 grams of products from 46 grams of reactant illustrates the law of conservation of mass.

LAW OF CONSERVATION OF MASS:

The law of conservation of mass states that matter can neither be created nor destroyed.

This law further illustrates that in a chemical reaction where reactants on the left hand side combine to form products on the right hand side, the amount of reactants must equal the products.

Therefore, if 46 grams of products are formed from 46 grams of reactant, this depicts the law of conservation of mass.

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The osmotic pressure of the solution would be 27.2 atm.

Osmotic pressure refers to the minimum pressure that must act on a solution so as to limit its solvent from passing across a semipermeable membrane.

The osmotic pressure of a solution can be determined using the following mathematical expression:

π = \(icRT\)

Where:

π = osmotic pressure

i = van't Hoff index = 1 (glucose is non-ionizing)

c = molar concentration of solutions

R = ideal gas constant = 0.0821

T = temperature in kelving = 25 +73 = 298 k

In this case, the molar concentration of the solution can be calculated as:

Concentration = mole/volume

Mole of 85 g glucose = 85/180.156

                                    = 0.47 mol

Concentration = 0.47/0.425

                         = 1.11 M

π = 1 x 1.11 x 0.0821 x 298

  = 27.2 atm

In other words, the osmotic pressure of the solution would be 27.2 atm.

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Answer:

i think sulfur fluoride

The answer is a                                  bevasue it then becomes a chemical compound

Answer:

a

Explanation:

this would result in a compound and compounds are chemical changes so i think im right....

Answer:

0.209M

Explanation:

M1V1=M2V2

(28.5 mL)(0.183M)=(25.0mL)(M)

M2= 0.209M

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You can determine  the number of electrons it has in the highest occupied energy level. Option A

Representative elements are found in Groups 1, 2, and 13-18 of the periodic table. The group number corresponds to the number of valence electrons, which are the electrons in the outermost energy level.

For example, elements in Group 1 have one valence electron, while elements in Group 18 have eight valence electrons (except helium, which has two). Knowing the group number helps predict the element's chemical properties, as valence electrons play a significant role in chemical reactions and bonding.

Information regarding the total number of electrons (B), the number of filled energy levels (C), and the number of protons and neutrons in the nucleus (D) cannot be determined from just the group number.

However, you can use the element's atomic number and electron configuration to find this information. The atomic number represents the total number of protons and electrons in an atom, while electron configuration illustrates the distribution of electrons in energy levels. Option A

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When cyclic ester is reacted with ethyl alcohol in presence of heat and acidic medium, ethyl hexanoate is formed. The structure of ethyl hexanoate is attached in image.

Lactones are the name for cyclic esters. The COOH and OH groups that unite to generate water in these instances are a component of the same molecule.

German chemist Leopold Gmelin likely abbreviated the word "ester" from the German Essigäther, "acetic ether," when he first used it in 1848.

First, carbonyl oxygen abstracts a proton. The production of an ester on one side of the chain and alcohol on the other follow the attack of the ethyl molecule on the carbonyl carbon.

Thus, ethyl hexanoate is formed as a product.

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Answer:

The empirical formula of the compound is C2H5O.

The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. The frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.

The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. However, for the photoelectric effect to occur, the frequency of the incident light must be above a certain threshold frequency.

The threshold frequency is the minimum frequency of light required to dislodge electrons from the material. Below this threshold frequency, regardless of the intensity or duration of the light, no electrons will be emitted.

This behavior can be explained by the particle-like nature of light, where light is composed of discrete packets of energy called photons. The energy of a photon is directly proportional to its frequency. Only photons with energy greater than or equal to the binding energy of the electrons in the material can dislodge them.

Therefore, the frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.

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Answer:

D.) Paper will burn

Explanation:

The first three are physical properties of paper, but the last one is a chemical property of paper

Answer:

Explanation:

IUPAC nomenclature is based on naming a molecule's longest chain of carbons connected by single bonds, whether in a continuous chain or in a ring. All deviations, either multiple bonds or atoms other than carbon and hydrogen, are indicated by prefixes or suffixes according to a specific set of priorities

3.325 grams

The balanced chemical reaction for the decomposition of potassium chlorate is expressed as:

Determine the mole of potassium chlorate

According to stoichiometry, 2 moles of potassium chlorate produces 3 moles of oxygen. The mole of oxygen required is expressed as:

Calculate the required mass of oxygen

Hence the required mass of oxyeen required is 3.325 grams

Answer: 20.9 billion years.

Explanation: To estimate the age of the rock, we can use the fact that the half-life of uranium-238 is 4.47 billion years. This means that half of the uranium-238 in the rock would have decayed into lead-206 after 4.47 billion years, and half of what remains would decay in the next 4.47 billion years, and so on.

If 20% of the uranium-238 in the rock has decayed into lead-206, then 80% of the original uranium-238 is still present in the rock. This means that the rock has gone through one half-life of uranium-238 decay, and we can estimate its age by using the graph on page 253.

According to the graph, the ratio of lead-206 to uranium-238 after one half-life is approximately 0.027. This means that the rock contains 0.027 times as much uranium-238 as it did originally, and the remaining 80% of the uranium-238 corresponds to 0.8 times the original amount.

Therefore, we can estimate the original amount of uranium-238 in the rock as follows:

Original amount of uranium-238 = (0.8) / 0.027 = 29.63 times the current amount

Next, we can use the fact that each half-life corresponds to a reduction in the amount of uranium-238 by a factor of 2, to estimate the number of half-lives that have passed since the rock formed:

Number of half-lives = log2(29.63) = 4.88

Finally, we can estimate the age of the rock as follows:

Age of the rock = (4.88) x (4.47 billion years per half-life) = 20.9 billion years

Therefore, we can estimate that the age of the rock is approximately 20.9 billion years.

Answer:

To prepare 250 ml of 0.15 M KNO3 solution, you will need to follow these steps:

Calculate the amount of KNO3 needed:

Molarity (M) = moles of solute/liters of solution

Rearranging the formula, moles of solute = M x liters of solution

Moles of KNO3 needed = 0.15 M x 0.25 L = 0.0375 moles

Calculate the mass of KNO3 needed:

Mass = moles x molar mass

The molar mass of KNO3 is 101.1 g/mol

Mass of KNO3 needed = 0.0375 moles x 101.1 g/mol = 3.79 g

Dissolve the calculated amount of KNO3 in distilled water:

Weigh out 3.79 g of KNO3 using a digital balance

Add the KNO3 to a clean and dry 250 ml volumetric flask

Add distilled water to the flask until the volume reaches the 250 ml mark

Cap the flask and shake it well to ensure the KNO3 is completely dissolved

Verify the concentration of the solution:

Use a calibrated pH meter or a spectrophotometer to measure the concentration of the solution

Adjust the volume of distilled water or the mass of KNO3 as needed to achieve the desired concentration

It is important to note that KNO3 is a salt that can be hazardous if ingested or inhaled in large quantities. Therefore, it is recommended to handle it with care and wear appropriate personal protective equipment.

Explanation:

The mass (in grams) of magnesium sulfate, MgSO₄ that would be produced from the reaction is 87.76 g

The mass of magnesium sulfate, MgSO₄ produced can be obtain as illustrated below:

Al₂(SO₄)₃ + 3Mg -> 2Al + 3MgSO₄ ΔH = +722 KJ

From the balanced equation above,

When 722 KJ of heat were absorbed, 360 g of MgSO₄ were produced

Therefore,

When 176 KJ of heat is absorbed = (176 × 360) / 722 = 87.76 g of MgSO₄ will be produce

Thus, the mass of MgSO₄ produced is 87.76 g

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Answer:

bulb or pump, meniscus, outside

Explanation:

In order to use a pipet, place a BULB OR PUMP at the top of the pipet. Use this object to fill the pipet such that the MENISCUS of the liquid is even with the volume line. Release the liquid, touching the tip of the pipet to the side of the container if necessary to release the last drop OUTSIDE the pipet tip.

Answer:

Lower the pH slightly

Explanation:

The mixture of HF, hydrofluoric acid and KF, potassium fluoride produce a buffer that is defined for the equilibrium:

HF(aq) → H⁺(aq) + F⁻(aq)

The buffer can maintain the pH of a solution despite the addition of strong bases or acids.

The reaction of HF with Ca(OH)2 is:

2HF + Ca(OH)2 → 2H2O + CaF2

That means the calcium hydroxide is decreasing the concentration of HF. Based on the equilibrium, the H+ and F- ions will decrease in order to produce more HF. As H+ is decreasing due the equilibrium and not for the addition of a strong base, the pH is decreasing slightly.

Answer:

B. the atmosphere

Explanation:

hope it helps

Answer: Diamond is covalent crystal. It has the highest melting point because high energy covalent bonds hold the crystal together.

Explanation: Covalent bonds are very strong, so covalent network solids typically have the highest melting points out of all four types of solids.

Answer:

giant covalent solids

Ionic solids also have high melting points, often over 1000 degrees but they can vary. Some are often low enough to melt in the lab with a Bunsen burner:

Answer:

a) 4

b) 2

c) 5

d) 2

e) 4

f) 3

Explanation:

The complete question is shown in the image attached to this answer.

We know that the shorter the wavelength, the greater the energy. The greatest energy and shortest wavelength among the emission lines is 4.

Applying the same argument as above, the greatest energy catapults the electron from energy level n=1 to n=4. This will corresponds to the shortest wavelength since energy is inversely proportional to wavelength.  

Frequency is also inversely related to wavelength for two waves travelling at the same speed. Hence, the transition that corresponds to the highest energy and shortest wavelength in the emission spectrum will have the highest frequency.

The emission line with the lowest energy occurs when the electron moves from n=2 to n=1.

The ionization energy is the energy required to remove an electron from the hydrogen atom. It corresponds to the transition n=1 to n=∞

Answer:

D

Explanation:

i did it before

The bond length has been defined by the distance shared by the covalently bonded atoms. C≡N (887 kJ/mol) has the longest bond followed by C=N and the shortest C-N.

Bond length is a parameter that defines the bond distance and measures the length between the bonded atoms. It is determined by bonded electrons.

The bond energy and bond length are directly related and hence the C≡N (887 kJ/mol) has the longest bond length because of high energy followed by C=N (615 kJ/mol) and the shortest C-N (305 kJ/mol).

Therefore, the order of bond length is C≡N > C=N > C-N.

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a) The balanced chemical equation for the reaction is: 2H₂ + O₂ → 2H₂O

b) the number of moles of O₂ required is approximately 1.004 moles.

c)  approximately 45 liters of H₂ and 22.5 liters of O₂ are needed to obtain 45 liters of H₂O.

a) Balancing the chemical equation:

The balanced chemical equation for the reaction is: 2H₂ + O₂ → 2H₂O

b) Calculating the number of moles of the reactants needed to obtain 45 liters of H₂O:

From the balanced equation, we can see that for every 2 moles of H₂O produced, we need 2 moles of H₂ and 1 mole of O₂. Since the stoichiometry is based on moles, we need to convert the given volume of H2O into moles.

To convert volume to moles, we need to use the ideal gas law, PV = nRT. At standard temperature and pressure (STP), the molar volume of an ideal gas is 22.4 liters.

Given that we have 45 liters of H2O, we can calculate the number of moles as follows:

moles of H₂O = (volume of H₂O) / (molar volume at STP)

            = 45 liters / 22.4 liters/mol

            ≈ 2.008 moles of H₂O

Since the stoichiometry of the reaction is 2 moles of H₂O for every 2 moles of H₂, we need an equal number of moles of H₂. Therefore, the number of moles of H₂ required is also approximately 2.008 moles.

For O₂, since the stoichiometry is 1 mole of O₂ for every 2 moles of H₂O, we need half the number of moles of H₂O. Thus, the number of moles of O₂required is approximately 1.004 moles.

c)  the volume of the reactants:

Since the stoichiometry of the balanced equation is 2 moles of H₂for every 1 mole of O₂ and 2 moles of H₂O, we can deduce the volume of the reactants based on their molar volumes at STP.

For 2.008 moles of H₂, the volume can be calculated as follows:

volume of H₂= (moles of H₂) * (molar volume at STP)

            = 2.008 moles * 22.4 liters/mol

            ≈ 45 liters of H₂

For 1.004 moles of O₂, the volume can be calculated similarly:

volume of O₂= (moles of O₂) * (molar volume at STP)

            = 1.004 moles * 22.4 liters/mol

            ≈ 22.5 liters of O₂

Therefore, approximately 45 liters of H₂and 22.5 liters of O₂ are needed to obtain 45 liters of H₂O

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Answer:

Na3N

Explanation:

cuzdoodlikeimsosure

Pentane, which has the chemical formula C5H12, reacts with oxygen to produce carbon dioxide and water according to the following balanced chemical equation:

2 C5H12 + 25 O2 -> 10 CO2 + 12 H2O

To determine the mass of carbon dioxide produced when 18.7 grams of pentane is burned, we can use the stoichiometry of the chemical reaction. Stoichiometry is the study of the quantities of reactants and products in a chemical reaction, and it allows us to predict the amount of a product that will be produced based on the amount of reactant consumed.

Since the chemical equation is balanced, we know that for every 2 molecules of pentane that react, 10 molecules of carbon dioxide are produced. This means that for every 2 grams of pentane that react, 10 grams of carbon dioxide will be produced.

Since 18.7 grams of pentane is equivalent to 18.7 / 2 = 9.35 moles of pentane, we can use this value to calculate the number of moles of carbon dioxide produced:

9.35 moles of pentane * (10 moles of CO2 / 2 moles of C5H12) = 9.35 * 5 = 46.75 moles of CO2

To convert the number of moles of carbon dioxide to mass, we can use the molar mass of carbon dioxide, which is 44.01 grams per mole:

46.75 moles of CO2 * 44.01 grams/mole = 2068.7 grams of CO2

Therefore, if 18.7 grams of pentane is burned, approximately 2068.7 grams of carbon dioxide is produced.

Answer:

Explanation:

Combined Gas Law

T2= T1P2V2/ (P1V1) = 348.15 X .5 X 3.4/(2 X 7.5) =39.46 K or -233.69C

Answer:

45.5 grams and AB=1.1547, AC = 2.3094

Explanation:

The first question requires converting grams to moles, and finding the (molar) ratio that the reactants react. There are 31.9 grams of silver nitrate, which equals 31.9/169.87 moles, or 0.188 moles. Silver nitrate reacts with an excess of iron chloride to produce 0.188 moles of iron nitrate. 0.188 moles of iron nitrate, or 241.86*0.188 grams. 241.86*0.188 grams is also equal to about 45.5 grams. There is a chance that i have the wrong molar masses, so try to do it yourself too.

For the second problem, this is a 30 60 90 triangle, which has the property that the hypotenuse is twice the length of the smallest leg, and 2/3*sqrt3 the size of the medium length leg. In this case, the triangle isn't drawn to scale at all, so don't go off the provided picture to determine lengths. AC is 2/3*sqrt3 times the length of BC, or \(4\sqrt{3} /3\) , or about 2.3094. Since the shortest leg is half the length of AC, the hypotenuse,  AB would be 2.3094/2, or 1.1547. Make sure to round to what the question requires.

The reaction can be said to be at equilibrium when the reaction rates of making products and using reactants are equal.

When the rates of the forward and reverse reactions are equal and the concentrations of the reactants and products don't change over time, a chemical reaction is said to be in equilibrium.

When the system reaches equilibrium, it is in a state of balance, which means that the concentrations of the reactants and products have not changed significantly.

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