Can all substances change into solid, liquid and gas form?.

Answer:

Most Monarch butterflies live only for a few weeks However, some will migrate to warmer climates and survive the entire winter.

Each isotope's atomic mass unit is substituting. We are given the following percentages: 90% divided by 100% of x 35, 8% divided by 100% of x 37, and 2% divided by 100% of x 38. As a result, the averag atomic mass unit is near to 30 at 35.

Atoms of the same element that have variable numbers of neutrons but the same number of protons are called isotopes.

Average The arithmetic mean is calculated by adding a set of numbers, dividing by their count, and then taking the result. The average of 2, 3, 3, 5, 7, and 10 is one example.

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Answer:

The two such half field atomic orbitals compbine to from a molecular orbital which contains both these electrons. But helium (Z=2) has already a filled orbital (1s2). Therefore, the atomic orbitals of the helium atoms donot combine. Thus, a molecule of H2 exists while that of He2 does not.

Answer:

Explanation:

If a substance contains ionic bonds, then it’s properties would include high melting and boiling points, a crystalline structure, the ability to dissolve quite easily in water, the ability to conduct electricity, have good insulation and lastly be quite hard and brittle.

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Answer:

1451.496

Explanation:

A unit of weight equal to 1,000 kilograms, or approximately 2,204.6 pounds

tons =

kg

______

1000.0

Answer:

That it is hard to compress

Explanation:

In acidic solutions, both silver sulfide (Ag2S) and silver chloride (AgCl) can dissolve to some extent, but silver chloride is more likely to dissolve than silver sulfide.

What is acidic solutions?

Acidic solutions are solutions that have a pH value less than 7. A solution with a pH of 7 is considered neutral, while solutions with a pH below 7 are acidic. The pH scale ranges from 0 to 14, with lower values indicating greater acidity, higher values indicating greater basicity, and a pH of 7 representing neutrality.

Acidic solutions contain a higher concentration of hydrogen ions (H+) than hydroxide ions (OH-). When an acid is added to water, it donates hydrogen ions to the water molecules, which increases the concentration of H+ ions in the solution. Some common examples of acidic solutions include lemon juice, vinegar, and hydrochloric acid.

In acidic solutions, both silver sulfide (Ag2S) and silver chloride (AgCl) can dissolve to some extent, but silver chloride is more likely to dissolve than silver sulfide.

The solubility of these compounds in an acidic solution depends on their respective solubility product constants (Ksp) and the concentration of H+ ions in the solution. The solubility product constant is a measure of the equilibrium concentration of the dissolved ions in a saturated solution of a salt.

The Ksp value of AgCl (1.8 × 10^-10) is lower than that of Ag2S (1.6 × 10^-49), indicating that AgCl is more soluble in water than Ag2S. In acidic solutions, the concentration of H+ ions is high, which can react with the anions in the salts (S2- or Cl-) to form the corresponding acids (H2S or HCl).

In the case of AgCl, the reaction with H+ ions forms HCl, which is a soluble compound, and therefore, more AgCl dissolves to maintain equilibrium. In contrast, the reaction of Ag2S with H+ ions forms H2S, which is a weak acid and not very soluble, and hence, the solubility of Ag2S is low in acidic solutions.

Therefore, silver chloride is more likely to dissolve in an acidic solution than silver sulfide due to its lower solubility product constant and the formation of a soluble acid upon reaction with H+ ions.

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The following transition metals would be expected to have the smallest atomic radius is Technetium (Tc) is expected to have the smallest atomic radius among the given transition metals.

As we move across a period from left to right, the atomic radius generally decreases. This is due to an increase in the effective nuclear charge, which pulls the electrons closer to the nucleus.

Comparing the given elements:
A) Yttrium (Y) - Group 3, Period 5
B) Zirconium (Zr) - Group 4, Period 5
C) Niobium (Nb) - Group 5, Period 5
D) Technetium (Tc) - Group 7, Period 5
E) Ruthenium (Ru) - Group 8, Period 5

Since all these elements are in the same period (Period 5), we can simply look for the one that is furthest to the right, as it will have the smallest atomic radius due to the increase in effective nuclear charge.

Your answer: D) Technetium (Tc) is expected to have the smallest atomic radius among the given transition metals.

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1381.7 cups of coffee could be made with the amount of heat energy needed to melt 1 kg of aluminum.

(a) The specific heat capacity of aluminum is 0.897 J/g°C. To find the amount of heat needed to bring 1 kg (or 1000 g) of aluminum to its melting point from room temperature, we can use the formula:

     Q = mcΔT

where Q is the heat transferred, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature. Plugging in the values for aluminum, we get:

Q = (1000 g)(0.897 J/g°C)(660°C - 20°C)Q = 573420 J

So, 573420 J of heat must be transferred to each kilogram of aluminum to bring it to its melting point from room temperature.

(b) The energy needed to make a cup of coffee is about 415 J. To find out how many cups of coffee could be made with the amount of energy needed to melt 1 kg of aluminum, we can divide the total energy by the energy needed for one cup of coffee:573420 J / 415 J/cup = 1381.7 cups.

So, about 1381.7 cups of coffee could be made with the amount of energy needed to melt 1 kg of aluminum.

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Yes, the polymerization of ethylene units will result in the polymer polyethylene.

Polyethylene is a common thermoplastic polymer made from the polymerization of ethylene monomer units. Ethylene (C₂H₄) has a double bond between the carbon atoms, which can be broken under certain conditions to form new single bonds. When many ethylene molecules undergo this reaction, they can polymerize into long chains of polyethylene molecules.

The resulting polyethylene polymer has a high molecular weight and is a widely used plastic material due to its properties such as strength, flexibility, and chemical resistance.

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Answer:

metalloids

Explanation:

i got the answer key /:

It is hypothesized that as the temperature of the air inside the plastic bottle decreases, the volume of the air will decrease as well, in accordance with Charles's Law and the contraction of the plastic bottle.

Hypothesis:

Based on the ideal gas law and the behavior of gases, it is hypothesized that when the temperature of the air inside a plastic bottle is decreased, the volume of the air will decrease as well. This hypothesis is rooted in the understanding that gases tend to contract and occupy less space when their temperature decreases.

According to Charles's Law, which states that the volume of a gas is directly proportional to its temperature when pressure is held constant, it is expected that as the temperature of the air in the plastic bottle decreases, the gas molecules will lose kinetic energy, resulting in a decrease in their average speed. This decrease in speed will lead to a decrease in collisions between the gas molecules and the walls of the container, causing the air to occupy less volume.

Furthermore, since the air is trapped inside a plastic bottle, the decrease in temperature is expected to cause the plastic to contract slightly, exerting additional external pressure on the gas molecules and further reducing the volume they occupy.

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The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.

Given:

Power rating of the refrigerator = 500 W

Running time per day = 12 hours

Number of days = 30

First, we need to convert the power rating from watts to kilowatts:

Power rating = 500 W / 1000 = 0.5 kW

Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:

Energy used = Power rating × Running time × Number of days

Energy used = 0.5 kW × 12 hours/day × 30 days

Energy used = 180 kWh

Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

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Answer:

mass number

Explanation:

The sum of the protons and neutrons in an atom equals the mass number of such an atom.

So;

Mass number = number of protons + number of neutrons.

0.54g is the mass of carbon in  0.045 moles of carbon. Elementary particles shared the same quantity of matter.

A body's mass is an inherent attribute. Until the discoveries of the atom as well as particle physics, it was thought to be tied to the amount of matter inside a physical body. It was discovered that various atoms and elementary particles shared the same quantity of matter.

mole = given mass/ molar mass

substituting all the given values in the above equation, we get

0.045 moles = mass/ 12

mass =0.045×12= 0.54g

Therefore, 0.54g is the mass of carbon in  0.045 moles of carbon.

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The mass of (NH4) 2S in the solution is : Mass = 0.0600 mol × 60.08 g/mol = 3.60 g.

The given molarity and volume of the solution can be used to calculate the number of moles of ammonium sulfide (NH4)2S.Then, the number of moles can be converted to mass using the molar mass of (NH4)2S.Mass of ammonium sulfide (NH4)2S in 3.00 L of a 0.0200 M solution is given by : Mass = moles × molar mass.The number of moles of (NH4)2S can be found using the equation:Molarity = Number of moles / Volume.Rearranging this equation, we get:Number of moles = Molarity × Volume Number of moles of (NH4)2S = 0.0200 M × 3.00 L.Number of moles of (NH4)2S = 0.0600 mol.The molar mass of (NH4)2S can be calculated by summing the molar masses of ammonium (NH4) and sulfide (S) ions.Molar mass of (NH4)2S = (2 × Molar mass of NH4) + Molar mass of S= (2 × 14.01 g/mol) + 32.06 g/mol= 60.08 g/mol.

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The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


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Answer:

Liquid water (H2O) is formed when two gases, hydrogen (H2) and oxygen (O2), react. ... The difference in the properties of water can be attributed to physical changes to the hydrogen and oxygen atoms on a subatomic level. The properties of the gases are combined to give water its properties.

Explanation:

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Answer:

Kinetic energy=1/2mv^2.

1/2×65×2.5^2.

1/2×6.5×6.25.

1/2×40.625.

=20.3125Joules.

The branch of science which deals with the chemicals bond is called chemistry.

The correct answer is 20.3125J

The energy formed by the motion of particles is called kinetic energy. The formula is half of the product of the mass and velocity.

\(Kinetic\ energy=\frac{1}{2}mv^2.\)

After putting the value:-

\(\frac{1}{2}*65*2.5^2.\)

After solving the equation, the kinetic energy is 20.3125Joules.

Hence, the correct answer is 20.3125Joules.

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Answer:

6.75 moles of CuCl₂ were used

Explanation:

Given data:

Number of moles of AlCl₃ formed = 4.5 mol

Number of moles of CuCl₂ used = ?

Solution:

Chemical equation:

3CuCl₂ + 2Al  →   2AlCl₃ + 3Cu

Now we will compare the moles of CuCl₂ and AlCl₃

               AlCl₃       :      CuCl₂

                   2         :        3

                 4.5        :      3/2×4.5 = 6.75

6.75 moles of CuCl₂ were used.

The different chemicals emit different colors of light because it will depends on the energy of the photons emitted.

The color of the light emitted will depends on the energy of the photons that is emitted. The emission of the photons take place when the electron jump from the higher energy state to the lower energy state. When the electrons comes to the lower energy state it will emits photons in form of the light.

The light emitted by the photons are different for the different chemicals because no two elements will have the same set of the energy levels.

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8.6 mole sample of NO₂ in a 5. 1 L container has 4.6 atmospheric pressure at 33 K.

Given, number of moles of No₂(n) = 8.6 mole

Volume (V) = 5.1 liters

Temperature (T) = 33K

R= 0. 08206 L•atm / (mol•K)

Using ideal gas equation ,

PV=nRT

P (5.1L) = (8.6mol) (0.08206L•atm/(mol•K)) (33K)

P (5.1) = 8.6 × 0.08206 × 33

P (5.1) = 23.3

P = 23.3 ÷ 5.1

P = 4.6 atm

Hence, the pressure of the given gas is 4.6 atmosphere (atm).

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A factor which helped to first drive plants to live on land is: A. greater access to sunlight on land.

In Science, photosynthesis is a light-dependent process and it is typically represented by the following chemical reaction:

Carbon dioxide + water + light energy ⇒ sugar + oxygen

Based on the chemical reaction above, we can infer and logically deduce that light energy (sunlight) obtained from the Sun is a very important factor for photosynthesis.

Consequently, greater access to sunlight on land became a factor which helped to first drive plants to live on land.

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Answer:

it is A step by step

Explanation:

6.973x 10^-2 M is the concentration of sulfuric acid.A chemical reaction known as neutralization occurs when an acid and a base quantitatively react with one another.

The pH of the neutralized solution is determined by the acidity of the reactant. In a neutralization process, an acid and a base combine to create salt and water.

The response to this issue is as follows:

H2SO4 + 2 NaOH = Na2SO4 + 2 H2O

To ascertain the molar ratio of the reactants, we require this reaction. The ratio is thus 1 mol H2SO4 to 2 mol NaOH.

This is the following method of calculation:

0.03442x 0.103x 1mol H2SO4/2molNaOHX1/0.0025=6.973X10^-2

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To find the molar solubility of substance X, we need to convert the given solubility from milligrams per liter (mg/L) to moles per liter (mol/L). The molar solubility of substance X is 1.28 × 10^(-10) mol/L.

Step 1:

We need to convert 2.4×10−5 mg/L to grams per liter (g/L) by dividing by 1000, which gives us 2.4×10−8 g/L.

Solubility = 2.4 × 10^(-5) mg/L
1 mg = 0.001 g, so:
Solubility = 2.4 × 10^(-5) × 0.001 g/L = 2.4 × 10^(-8) g/L

Step 2:
Next, we need to convert the mass to moles using the molar mass of substance X.

Molar mass = 188 g/mol
Molar solubility =2.4×10−8 g/L ÷ 188 g/mol = 1.28×10−10 mol/L
This is the molar solubility of substance X.

The molar solubility of substance X is 1.28×10−10 mol/L.

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Answer:

1120 mm Hg

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Answer:

200 meters

Explanation:

if u swim for each end 4 times, and its 50 meters long, 50 x 4 = 200 meters

Answer:

D.

Explanation:

Because protons and neutrons make up the mass of an atom.