The specific gravity of alcohol is 0.80. What is its specific volume?

Answer:

63.55 g

Explanation:

The relation between molecular (formula) mass and molar mass Page 4 4 • To obtain one mole of copper atoms (6.02 x 1023 atoms), weigh out 63.55 g copper. The molar mass (M) of a substance is the mass of one mole of entities (atoms, molecules, or formula units) of the substance.

Answer:

63.55 Grams.

Explanation:

The term mole concept is used here to determine the moles of ammonia. The number of moles of ammonia which can be make from 6.20 moles of N₂ is 12.4.

One mole of a substance is defined as that quantity of it which contains as many entities as there are atoms exactly in 12 g of carbon - 12. The formula used to calculate the number of moles is:

Number of moles = Given mass / Molar mass

You need one nitrogen atom to produce ammonia. Here we can see that there are two nitrogen atoms in N₂.

One mole of any substance contains Avogadro number of molecules. A mole is defined as the mass of the substance which consists of the equal quantity of basic units.

The number of moles of ammonia from 6.20 moles of N₂ is:

6.20 × 2 = 12.4

Thus the number of moles is 12.4.

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Answer: This is because the atomic radius increases with increasing electronic energy. This reduces the attraction for the valence electrons of other atoms, reducing reactivity.

If you spill hydrochloric acid on your skin or clothing then rinse the exposed clothing or skin with water and call 911. Option A and C are correct.

If you spill hydrochloric acid on your skin or clothing, it's important to act quickly to minimize the damage. You should rinse the affected area with water immediately to dilute the acid and prevent further skin damage. It's also important to call 911 for medical assistance, as hydrochloric acid can cause serious chemical burns and may require medical treatment.

Telling your teacher about the accident is important for safety and record-keeping purposes, but it should not be the first priority. Trying to save the hydrochloric acid for recycling purposes is not recommended, as your safety should be the top priority in this situation.

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Answer:A , B

Explanation:

The compound that releases hydroxide ions in an aqueous solution would be a base.

Bases are substances that when ionized in water, produce hydroxide ions as the only negative ion.

Bases are as opposed to acids. The latter produces hydrogen ions as the only positive ion when ionized in water. For example, sodium hydroxide ionizes in aqueous solutions as follows:

\(NaOH --- > Na^+ + OH^-\)

Bases can also be defined as substances whose pH is above 7.

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Answer:

twenty-four grams of magnesium metal reacts with sixteen grams of oxygen gas to form magnesium oxide. According to the law of conservation of mass, how much magnesium oxide will there be after the chemical change is complete

Explanation:

twenty-four grams of magnesium metal reacts with sixteen grams of oxygen gas to form magnesium oxide. According to the law of conservation of mass, how much magnesium oxide will there be after the chemical change is complete

All the levels of atmosphere and biospheres are interconnected. The changes in each level would cause a change in the other. Here, the atmospheric changes causes changes in hydrosphere which then affects the biosphere. Thus option A is correct.

Biosphere is the level or region in earth where all living things exists. There are different types of biospheres also called as ecosystems. They are mainly forests, aquatic systems, grasslands, deserts, marshy lands etc.

All these ecosystems are related with the surrounding atmosphere and hydrosphere. There may happen certain atmospheric changes such as in the overall temperature, humidity, cold, air quality etc depends on the composition of gases and dusts.

Any change in atmosphere such as fall in temperature make a change in hydrosphere and thus affects the water used by the livings in biosphere. Hence the change starts from the atmosphere causes a change in hydrosphere then affect the  biosphere. Thus option A is correct.

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Answer:

The periodic table can be use to determine the properties of new elements by organi the elements according to their numbers

Explanation:

The periodic table is used to determine the properties of elements by grouping or arranging the chemical elements based on their atomic number (number of protons).

A periodic table can be defined as an organized tabular array of all the chemical elements, which is typically arranged in order of increasing atomic number or number of protons (in rows).

In Science, a periodic table comprises seven (7) rows and eighteen (18) columns.

Generally, all chemical elements are arranged or grouped on the periodic table based on their atomic number (number of protons), so as to achieve the following:

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The answer is 24.3 h.

Solution:

The half-reaction for the reduction of Al3+ (in Al2O3) is given by

Al3+(aq) + 3e- (aq) --> Al(s)

Faradays 1st law is used

w = (i x t / F) x (M/z)

i is current used = 20.0 A

t is time in seconds which we calculate first

F is Faraday constant = 96485 C/mol

M is atomic mass of Al = 26.98g/mol

z is the number of electrons involved per reduction = 3

w is the weight of Al = weight of Al required for 12 cans

= ( 13.6 g / 1can) x 12 cans  = 163.2g

substituting we get

163.2g  = (20.0A x t / 96485C/mol)  x (26.98g/mol / 3)

t = 87545 s

= (87545s) x ( 1h / 3600s)

= 24.3 h

Thus, the time in hours needed for the production of Aluminium that can make up 12 cans = 24.3.

Electrolysis of molten aluminum oxide at carbon electrodes produces pure metal at the cathode and oxygen at the anode. This oxygen reacts with the positively charged carbon electrode to produce carbon dioxide gas. Extraction is done by electrolysis, but the alumina must first be melted so that electricity can flow.

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Answer:

B)

Explanation:

i would say physical weathering, nothing is changing chemically and nothing is being deposited, weathering is the process of deteriorating something

Answer:

babe where are u???????!

Explanation:

babe plz text me im lowkey freaking out rn

Answer:

B

Explanation:i think

A chloride ion (Cl-) has the same number of electrons as a neutral atom of chlorine (Cl).

A neutral atom of chlorine has 17 electrons in its outermost shell. When it gains an electron, it becomes a negatively charged ion known as chloride ion.

This additional electron fills up the outermost shell, which now has a total of 18 electrons. This is because the number of electrons in an atom is equal to the number of protons in the nucleus, which determines the atomic number and the element.

When an atom gains or loses an electron, it becomes an ion with a positive or negative charge, respectively.

This is because the number of protons in the nucleus still determines the atomic number and element, but the number of electrons now differs from that of a neutral atom. In the case of a chloride ion, it has 18 electrons, which is one more than a neutral atom of chlorine.

The extra electron creates an excess negative charge, balancing out the positive charge of the 17 protons in the nucleus.

It's worth noting that while a chloride ion has the same number of electrons as an argon atom, they are not the same element. Argon has 18 protons in the nucleus, while chlorine has 17.

Additionally, argon's electron configuration is such that all of its shells are filled, whereas chlorine's outermost shell has room for one more electron before it becomes full.

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The total time required for the decay is approximately 1416.0 hours, which is closest to the given option C. 1006.9 hours.

Option (C) is correct.

To calculate the number of half-lives required for the decay. The half-life of 140 Ba is given as 283.2 hours.

First, we calculate the fraction of the original amount remaining after each half-life. Since the half-life represents the time it takes for half of the substance to decay, the fraction remaining after each half-life is 1/2.

To find the number of half-lives required to decay from 35 mg to 1.0 mg, we can set up the following equation:

(35 mg) * (1/2)ⁿ = 1.0 mg

Where 'n' is the number of half-lives.

Now, let's solve for 'n':

(1/2)ⁿ = 1.0 mg / 35 mg

(1/2)ⁿ = 0.02857

To find 'n', we can take the logarithm (base 1/2) of both sides:

n = log base 1/2 (0.02857)

Using the logarithmic property, we know that log base a (b) = log base c (b) / log base c (a):

n = log (0.02857) / log (1/2)

Using a calculator, we can find:

n ≈ 4.243

Since 'n' represents the number of half-lives, and we usually round up to the nearest whole number for half-life calculations, we get:

n ≈ 5

Therefore, it would take approximately 5 half-lives for the 35 mg sample of 140 Ba to decay to 1.0 mg.

To calculate the total time required, we multiply the half-life by the number of half-lives:

Total time = 283.2 hours * 5

Total time ≈ 1416 hours

Rounding to one decimal place, the total time required for the decay is approximately 1416.0 hours, which is closest to the given option C. 1006.9 hours.

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2C6H12O6(s) + 6O2(g) -> 12CO2(g) + 6H2O(l)

The reaction given is a combustion reaction of glucose. The balanced equation tells us that for every 2 moles of glucose, 6 moles of O2 are consumed and 12 moles of CO2 are produced.

We are given that 2.75 dm3 of O2 is reacting, which we can convert to moles using the ideal gas law PV = nRT where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant and T is temperature.

Given that the temperature is in Kelvin and R = 8.314 J K-1mol-1

n = (PV) / RT = (2.75 dm3 * 1atm) / (8.314 J K-1mol-1 * 298K) = 0.0591 mol O2

Since the number of moles of O2 is 0.0591 mol, the number of moles of CO2 produced will be 12 * 0.0591 mol = 0.709 mol

To find the volume of CO2 produced, we can use the ideal gas law again:

V = nRT/P

V = (0.709 mol * 8.314 J K-1mol-1 * 298K) / 1 atm = 16.27 dm3

So the volume of carbon dioxide produced will be 16.27 dm3.

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Answer:  reverse osmosis.

Explanation:

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Explanation:

True. They may both be properties of a gas but they are independent of each other since the pressure of a gas may vary without changing the temperature or volume (or any other properties).

Answer:

True

Explanation:

The statement "The qualities/quantities of a gas are independent of one another" is True. This means that a change in one property of a gas, such as pressure, volume, or temperature, does not affect the other properties. This is one of the basic assumptions of the ideal gas law, which states that the pressure, volume, and temperature of a gas are proportional to one another under certain conditions.

For example, when the volume of a gas is increased, its pressure decreases, and when its temperature is increased, its pressure also increases. These changes in properties are independent of one another, and can be described by the mathematical relationships described by the ideal gas law.

ALLEN

The correct answer is b. The addition of PbS(s) has no effect on the system, as the solution is already saturated and cannot dissolve any more PbS.

The given statement is related to the solubility product constant, Ksp. Ksp is the equilibrium constant for a solid that is in equilibrium with its respective ions in a solution.

The value of Ksp for a solid is dependent on the concentrations of its respective ions in the solution. If the concentration of the ions in the solution is equal to the Ksp value of the solid, the solution is said to be saturated.

In the given statement, the solution is already saturated with respect to PbS(s). This means that the concentration of Pb2+ and S2- ions in the solution is already at equilibrium with the solid PbS.

The addition of more PbS will not increase the concentration of these ions any further, as the solution cannot dissolve any more PbS.

Therefore, option b is correct, as the addition of PbS(s) has no effect on the system.

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Answer:

i believe the answer is a

Explanation:

Answer:

I  with daredevil16 agree, A

Explanation:

i wish i can help everyone around the world i have answered 20 brainly questions today i wish i could help you all but i'm only one person :(

but please mark me brainlyest i just wish to have 4 brainlyest its my goal.

Answer:

Therefore; the wavelength of wave is 6. 9×10−8m.

Answer:

1.26*10^16Hz

Using the planck-einsten equation, you plug in the values and you should get 1.26*10^16Hz.

Answer:

d

Explanation:

b and ga are same period

Using the equation H=cpmT and the water specific heat, the amount of heat received is determined. 4. At 100oC, water vaporizes into vapour.

The fact that it requires a lot of energy to boil water is one of its most important characteristics. To be precise, one calorie of heat must be absorbed by 4,184 Joules of water for one degree Celsius of temperature rise. To provide some context, 1 kilogram of copper can be heated to 1°C with just 385 Joules of heat.

Water takes energy during the freezing, evaporation, and sublimation processes. The water molecules alter their bonding structure and transition to a higher energy state as a result of the energy received. This energy must be provided by the atmosphere in the Earth system.

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Answer:

Your answer ,it is not equal to it