Store equal amount of tap water in a glass jar and in a single use water bottle for 2 weeks in normal room temperature. Test the pH strength of the water in both cases using a pH paper and compare the results and arrive at conclusions.

What will be the conclusion

1. The approximate percent of water in the hydrate is 16%

2. The value of x in the hydrate is 2

Mass of hydrate, SnCl₂•xH₂O = 0.366 g

Mass of water, H₂O = 0.0586 g

Percentage of water =?

Percentage = (mass of water / mass of hydrate) ×100

Percentage of water = (0.0586 / 0.366) × 100

Percentage of water = 16%

To obtain the value of x, we shall determine the formula of the hydrate. This can be obtained as follow:

Divide by their molar mass

SnCl₂ = 0.3074 / 190 = 0.0016

H₂O = 0.0586 / 18 = 0.0032

Divide by the smallest

SnCl₂ = 0.0016 / 0.0016 = 1

H₂O = 0.0032 / 0.0016 = 2

Thus, the formula of the hydrate is SnCl₂•2H₂O

Comparing the formula of the hydrate (SnCl₂•2H₂O) with SnCl₂•xH₂O, we can see that the value of x is 2

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Answer:

7. Option 2. Atom 1 and Atom 4

8. The same number of valence electron

Explanation:

7. Determination of which symbol represent an isotope.

Isotopes are atoms having the same atomic number but different mass number due to the difference in the neutron number.

From the question given above, the following were obtained:

Z => atomic number

A => mass number

Atom >>> Isotope >>>>> Z >>>> A

1 >>>>>>> ¹⁷₇E >>>>>>>> 7 >>>> 17

2 >>>>>>> ¹⁷₈E >>>>>>> 8 >>>> 17

3 >>>>>>> ¹⁸₆E >>>>>>> 6 >>>> 18

4 >>>>>>> ¹⁸₇E >>>>>>> 7 >>>> 18

From the table above, only atom 1 and 4 has the same atomic number. Hence, atom 1 and atom 4 are isotopes.

8. To know the correct answer to the question, we shall write the electronic configuration of magnesium and calcium. This can be obtained as follow:

Mg (12) => 1s² 2s²2p⁶ 3s²

Valence electron => 2

Ca (20) => 1s² 2s²2p⁶ 3s²3p⁶ 4s²

Valence electron => 2

We can see that magnesium and calcium both have the same valence electron. Hence, they will have similar chemical properties.

The negatively charged atoms are known to show the electron affinity. Hydrogen is more reactive than oganesson based on electron affinity.

The amount of energy released when an electron is added to a neutral atom to create a negatively charged ion is known as electron affinity in chemistry.

Due to the difficulty in determining atoms' electron affinities, values are only known for a small number of chemical elements, primarily halogens.

Similar towards how chlorine can achieve the configuration of noble gases and become an electronegative ion, hydrogen has a high attraction for electrons, becoming the hydrogen anion and obtaining the stable configuration of helium.

The first synthetic element to belong to group 18 (the noble gases), oganesson has the potential to be substantially more reactive than the other members of that group.

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Butane < acetone < 1-propanol  is a list of the compounds in order of increasing boiling points.

The intermolecular interactions between molecules in a compound play a major role in boiling point. Higher boiling temperatures are a result of greater intermolecular interactions, bigger masses, and less branching.

The highest boiling point is for HF. As we go from HF to HI, the van der Waals forces of attraction between all hydrogen halides get stronger.

Boiling point rises as the difference in electronegativity grows. Additionally, the bp grows as the molecule's size does. So the sequence is CO2, CS2, CCl4, and then H2O.

Van der Waals attraction and dipole-dipole attraction draw acetone molecules together.

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Answer:

because time do not depend on direction. actually time is fake.nobody can stop it neither disturb it.it is in my view.

Answer:

120 g is the answer I think

In reference to the given data concerning the separation of the mixture, the percent by mass of salt in the mixture is 73.9%.

To find the percent by mass of salt in the mixture, we need to divide the mass of salt by the total mass of the mixture and multiply by 100.

First, we need to calculate the mass of sand in the mixture:

Mass of sand = Total mass of mixture - Mass of salt

Mass of sand = 2.18 g - 1.61 g = 0.57 g

Now we can calculate the percent by mass of salt in the mixture:

Percent by mass of salt = (Mass of salt / Total mass of mixture) x 100%

Percent by mass of salt = (1.61 g / 2.18 g) x 100%

The percent by mass of salt = 73.9%

Therefore, the percent by mass of salt in the mixture is 73.9%.

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Answer:

2,200 mL I believe it is.

Answer:

2,200 is the answer of your question

Answer:

Lumayan poin gratis...

gw gatau lu pake bahasa apaan njink

Answer:

1.Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.

2.The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma.

3.For every action there is an equal and opposite reaction.

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Answer:

Below! ;)

Explanation:

In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.

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The moderately reactive atoms located in the periodic table are fluorine, chlorine, bromine, and iodine which means the halogens family.

The number of balance electrons of the light metals compared to those heavier by listing elements in the order of increasing atomic number.

They are the five non-metals in family 7A of the periodic table. Halogens are chemical elements that form inorganic salts. In the periodic table they are part of group 17 or family 7A.

Halogens are strong oxidants and react mainly with alkali metals (Family I A) which tend to donate an electron. They also react with metals and noble gases (Family VIII A).

The chemical elements are arranged from left to right and top to bottom in order of increasing atomic number, or the number of protons in an atom's nucleus, which generally coincides with increasing atomic mass.

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What are halogen metals?

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Answer:

212 000 yrs

Explanation:

15/16 decay means 1/16 is left

 how many halflives is this?

                    (1/2)^n = 1/16

                       n = 4   half lives

4 half lives * 53 000 yr/ half life = 212 000 yrs

Answer:

c. 212,000 years

Explanation:

got it right on edge:3

The three terms - mass, volume, and density - all have a mathematical relationship between each other.

The Density Formula

\(d = \frac{m}{v} \)

In the formula, d is the variable for density, m is the variable for mass, and v is the variable for volume. Basically, when you divide the mass of an object by it's volume, you get the density of that object.

Because of this, we can assume that there are two other formulas to show us how we can find the mass and volume of an object, all which using the three terms stated in the question.

\(m = d \times v\)

\(v = \frac{m}{d} \)

Therefore, there is a mathematical relationship between mass, volume, and density.

1) The sun is a stat that is located in the middle of the solar system.

2) It gets squeezed together so lightly that four hydrogen nuclei combine to firm form helium atom. This is called nuclear fusion.

3) Solar flares, coronal mass ejection, high-speed solar wind and solar energetic particles.

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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Increasing the amount of time it takes for the egg drop device to stop would help protect the egg because it would decrease the force acting on the egg, according to the formula Force = Δ⍴ / Δt.

When the device comes to a stop, the change in momentum (Δ⍴) of the egg will be the same as the change in momentum of the device. If the device stops abruptly, the time interval (Δt) will be small, which means that the force acting on the egg will be larger (since Force = Δ⍴ / Δt). This large force could cause the egg to break.

On the other hand, if the device stops over a longer period of time, the time interval (Δt) will be larger, which means that the force acting on the egg will be smaller (since Force = Δ⍴ / Δt). This smaller force will be less likely to break the egg, making it more likely to survive the fall.

Therefore, increasing the amount of time it takes for the egg drop device to stop will help protect the egg by reducing the force acting on it and increasing the chances of a successful landing.

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250.0 mg of copper(II) sulfate pentahydrate was dissolved in 10.00 mL of solution. The concentration of the copper ion in the final solution is 0.8012 mmol/L.

To find the concentration of the copper ion in the final solution, we can use the concept of dilution.
First, we need to calculate the amount of copper(II) sulfate pentahydrate used in the new solution.
Since 250.0 mg of copper(II) sulfate pentahydrate was dissolved in 10.00 mL of solution, we can use the formula:
Amount = (concentration) x (volume)
Converting the mass to moles:
Amount = (250.0 mg) / (249.70 g/mol)

= 1.0016 mmol
Since 2.00 mL of the initial solution was used, the amount of copper(II) sulfate pentahydrate transferred is:
Amount transferred = (1.0016 mmol) x (2.00 mL / 10.00 mL)

= 0.2003 mmol
Next, we calculate the concentration of the copper ion in the final solution by dividing the amount transferred by the total volume:
Concentration = (0.2003 mmol) / (250.0 mL)

= 0.0008012 mmol/mL
Converting to moles per liter (mmol/L) or Molarity:
Concentration = 0.0008012 mmol/mL

= 0.8012 mmol/L
Therefore, the concentration of the copper ion in the final solution is 0.8012 mmol/L.

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It’s A) (0.1978)(10.01) + (0.8022)(11.01)

Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. Therefore option A is correct option.

Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.

Mathematically,

average atomic mass=  ∑(relative abundance x mass of isotope)

average atomic mass boron= (relative abundance boron-10  x mass of isotope boron-10)+(relative abundance boron-11  x mass of isotope boron-11 )

average atomic mass boron=(0.1978)(10.01) + (0.8022)(11.01)

Therefore option A is correct option.

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Answer:

Potassium sulfide

Potassium sulfide (K2S)

Explanation:

Potassium sulfide I searched it up so it has to be right. Right?

Answer:

The level of toxins in solutions

Answer:

The definition of toxicity is: the quality of being toxic or poisonous.

Answer:

21.5

Explanation:

3 Significant Figures is just another way of saying the three digits to the left and nothing else. thus, everything after the 4 is obselete, with the 4 being rounded up as it is followed by a five

Answer: 21.5

Explanation:

This is easy

The total mass of the particles produced by nuclear fission is less than the total mass of the particles before the reaction because of the conversion of mass to energy according to Einstein's famous equation E=mc^2.

During nuclear fission, the nucleus of an atom is split into two smaller nuclei, releasing a large amount of energy in the process. This energy is equivalent to the mass that is lost during the reaction, as per Einstein's equation. Therefore, the total mass of the particles after the reaction is less than the total mass before the reaction. This phenomenon is known as mass -energy equivalence.

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Aluminum is used to make the metal cylinder.

To determine the substance of the metal block, we need to calculate its specific heat capacity, which is the amount of heat required to raise the temperature of 1 gram of a substance by 1 degree Celsius.

The equation for calculating the heat absorbed by a substance is:

q = m * c * ΔT

where q is the heat absorbed, m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature.

In this case, we have:

m = 500.0 g (given)

ΔT = 50.0 K (given)

q = unknown

To find c, we can rearrange the equation to:

c = q / (m * ΔT)

We know that the metal block absorbed some amount of heat, which we can calculate by multiplying the mass of the block by the specific heat capacity of water (which is 4.184 J/g*K) and the temperature change:

q = (500.0 g) * (4.184 J/g*K) * (50.0 K) = 104,600 J

Now we can calculate the specific heat capacity of the metal block:

c = q / (m * ΔT) = (104,600 J) / (500.0 g * 50.0 K) = 4.184 J/g*K

This specific heat capacity is very close to that of aluminum (which is 0.903 J/g*K) and therefore, we can conclude that the metal block is made of aluminum.

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Bond orders are calculated by dividing the total number of electrons in bonding orbitals by the total number of bonds.

The Lewis structures of ethane and ethene can be used to predict the bond orders in these molecules. Ethane has a single bond between the carbon atoms, which indicates a bond order of one.

Ethene has a double bond between the carbon atoms, which indicates a bond order of two. The calculated bond orders for ethane and ethene are the same as those predicted by their Lewis structures.

The Lewis structure of ethyne can also be used to predict the bond order. It has a triple bond between the carbon atoms, which indicates a bond order of three. However, the calculated bond order for ethyne is less than three. This is because the electrons in the triple bond are spread out over a larger region, making the bond weaker than expected based on the Lewis structure.

The calculated bond order for ethyne is approximately 2.5, which is lower than the predicted bond order of three based on the Lewis structure.

In summary, the calculated bond orders for ethane and ethene are the same as those predicted by their Lewis structures. The calculated bond order for ethyne is lower than the predicted bond order of three based on the Lewis structure.

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The energy diagram of the reaction is shown in the image attached to this answer.

We know that in a reaction, we are dealing with the conversion of the reactants to products. In this case, there is the breakage of the bonds in the reactants and a recombination of the atoms of the reactants as they are now able to form the products.

We know that the topmost position of the energy diagram shows us the activated complex. This is the highest energy specie whose existence is transient on the way of the conversion of the reactants to the products.

The difference between the energy of the reactants and the energy of the activated complex is what we call the activation energy of the reaction which must be supplied in order for the reaction to proceed.

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1) Chemical equation

2) Heat released (kcal)

1 mol CH4 = -213 kcal

0.35 mol CH4 releases -74.55 kcal.

3) Heat released (kJ)

74.55 kcal

1 kcal = 4.19 kJ

0.35 mol CH4 releases -311.9 kJ