A steel cylinder contains a glass jar of sodium metal surrounded by water. All together the cylinder and its contents weigh 1000g. The cylinder is dropped which breaks the glass and shortly after popping sound is heard. Since the steel container did not break, we can assume that... *​

Answer:

1.16mol of NaCl

Explanation:

Question:

1. How many formula units are in 67.69 grams of salt?

2. How many molecules are in 44.99 grams of water?

Converting mass to moles:

In a given amount of moles (n) of a substance there will be a given amount of mass (m) of that substance. m and n are related by the molar mass (M):

m = n x M

Hence, if we want to find n, we must rearrange the equation:

n = m/M

Answer and Explanation:

The word 'salt' in this question will be assumed to mean table salt - sodium chloride, NaCl - with a molar mass of 58.44g/mol.

Hence, 67.96g will contain 67.69g / 58.44g/mol = 1.16mol of NaCl.

We convert from moles to number of molecules/formula units by multiplying by Avogadro's constant(6.02×10²³):

1.16 x 6.02×10²³ = 6.98×10²³

formula units of NaCl

Water has a molar mass of 18.02g/mol. Therefore, 44.99g of water will represent 44.99g / 18.02g/mol = 2.50mol of water.

2.50 x

6.02

×

10

23

=

1.505

×

10

24

molecules of water

Option A is correct way of representation of electronic configuration.

The molecular formula of Compound F is C₉H₉O. To calculate the Unsaturation Number (UN) or Double-Bond Equivalent (DBE), use the formula:

DBE = \(\frac{ (2C + 2 + N - H - X)}{2}\),

where C is the number of carbon atoms, N is the number of nitrogen atoms, H is the number of hydrogen atoms, and X is the number of halogen atoms.

For Compound F: DBE  =\(\frac{(2 * 9 + 2 - 9 - 0)}{2} = \frac{ (18 + 2 - 9)}{2} = \frac{11}{2}\)  = 5.5

Since the DBE must be a whole number, there might be a typo in the molecular formula. Assuming the correct molecular formula is C₉H₈O, the DBE would be:

DBE= \(\frac{(2 * 9 + 2 - 8 - 0) }{2} = \frac{(18 + 2 - 8) }{2} = \frac{12}{2}\) = 6

Now, based on the DBE value and the IR spectrum provided (unfortunately, we cannot see the IR spectrum, you can determine the possible functional groups present in Compound F. Some possible functional groups for a DBE of 6 are carboxylic acid, nitrile, ketone, alcohol, alkyne, benzene ring, ring, alkene, amine, aldehyde, and ester. You'll need to examine the IR spectrum to determine which of these functional groups are likely present in the compound.

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Answer:

As more potassium sulfate dissolves in the water, the mixture becomes

Explanation:

As more potassium sulfate dissolves in the water, the mixture becomes

Answer:

Carbon 16

Explanation:

Isotope of nitrogen

the half-reactions

cathode : Zn²⁺ (aq) + 2e⁻ ---> Zn (s)  

anode : Mg (s) → Mg²⁺ (aq) + 2e−

a balanced cell reaction

Zn²⁺(aq) + Mg(s)→ Zn(s) + Mg²⁺ (aq)

Given

Zn and Mg electrodes

Required

The half-reactions for a galvanic cell

Solution

To determine the reaction of a voltaic cell, we must determine the metal that serves as the anode and the metal that serves as the cathode.

To determine this, we can either know from the standard potential value of the cell or use the voltaic series

1. voltaic series

Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Ag-Pt-Au

The more to the left, the metal is more reactive (easily release electrons) and the stronger reducing agent

So the metal on the left will easily undergo oxidation and function as anode

Since Mg is located to the left of Zn, then Mg functions as anode and Zn as a cathode

2. Standard potentials cell of Mg and Zn metals :

Mg2+ + 2e– → Mg E° = -2,35 V

Zn2+ + 2e– → Zn E° = -0,78 V

The anode has a smaller E°, then Mg is the anode and Zn is the cathode.

Answer:

Explanation:help

The chemical formula of aluminum sulfide is Al2S3. Aluminum sulfide is a chemical compound with the chemical formula Al2S3. This white or off-white solid is an intermediate in the production of aluminum metal.

It is also used in the manufacture of other aluminum compounds and in the preservation of wood.Aluminum sulfide is produced by the combination of aluminum and sulfur under high pressure. The compound's structure consists of two aluminum atoms and three sulfur atoms. Al2S3 has a trigonal planar molecular geometry with D3h symmetry, as predicted by VSEPR theory.You write the chemical formula of aluminum sulfide by following the rules of writing chemical formulas for compounds. The formula of aluminum sulfide is Al2S3, as per the combining powers or valencies of aluminum and sulfur. Aluminum has a valency of +3 while sulfur has a valency of -2.Therefore, aluminum will combine with three sulfur atoms to make a compound with a neutral charge as the valence electrons balance out each other. As a result, the chemical formula for aluminum sulfide is Al2S3.

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The name of this compound using IUPAC rules is  3,4-dimethylhexane.

Option D is correct.

the IUPAC nomenclature of organic chemistry is described as a method of naming organic chemical compounds as recommended by the International Union of Pure and Applied Chemistry.

Option A, 2,3-diethylbutane, is incorrect because it has a different carbon chain length and different substituent positions.

Option B, 2-ethyl-3-methylpentane, is incorrect because it has a different carbon chain length and one of the substituents is incorrectly placed.

Option C, 3-methyl-4-ethylpentane, is incorrect because it has a different carbon chain length and the substituent positions are reversed.

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Answer:

Below:

Explanation:

Instead of a single, centralized brain, jellyfish possess a net of nerves. This “ring” nervous system is where their neurons are concentrated—a processing station for sensory and motor activity. These neurons send chemical signals to their muscles to contract, allowing them to swim.

Hope it helps...

It's Muska

The principle of option D. Uniformitarianism states that the physical, chemical, and biological processes at work shaping the Earth today have also operated in the

Option D. Uniformitarianism is the principle stating that the physical, chemical, and biological processes at work shaping the Earth today have also operated in the geologic past. It is based on the idea that the present is the key to the past. In other words, the same natural laws that operate in the universe today have been operating since the beginning of time.

James Hutton was the first to propose this principle in the late 18th century. He suggested that the Earth was shaped by slow-acting geological forces such as erosion, sedimentation, and uplift over long periods of time. He believed that the same processes were still happening today and that they had operated in the past.

This principle is an important concept in geology because it allows scientists to interpret the Earth's history based on the processes that they observe today. By understanding how these processes work and how they have changed over time, scientists can reconstruct the history of the Earth and its environments.

Uniformitarianism has been tested and proven through many observations and experiments. For example, the study of sedimentary rocks has shown that they were formed in the past through the same processes that are observed today, such as deposition of sediment by water, wind, or ice.

Similarly, the study of volcanoes has shown that they are formed by the same processes as today, such as the movement of magma from deep within the Earth.

In conclusion, Uniformitarianism is the principle that allows us to interpret the Earth's history by observing the processes that shape it today. It is a fundamental concept in geology and has been tested and proven through many observations and experiments.

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Answer:

True

Explanation:

Forces, equal in magnitude and opposite in direction, and cancel each other out are called Balanced Forces.

Balanced Forces DO NOT cause any change in the velocity of the object, but the Object may correspond to a change in shape or size.

Example :

Blasting a balloon by compressing it tightly with both hands, roughly with an equal force, is a practical example of Balanced Forces. In this case, the balloon before the burst stays at a state of rest and same after the burst. But the burst or the compression, causes a change in the shape of the balloon.

Answer:

The DNA can be found in the cell's nucleus and beside the DNA in the nucleus, humans and other complex organisms also have a small amount of DNA in cell structures known as mitochondria.

Explanation:

Hope this helps!

Answer:

In eukaryotic cells, it is in the nucleus. In prokayrotic cells it is in the nuclei. It is made of chromosomes passed down from parents

Explanation:

Hope this helps, good luck!

The sample of neon gas at STP represents approximately 0.0209 moles.

To calculate the moles of neon gas in a sample, we can use the Ideal Gas Law formula at Standard Temperature and Pressure (STP):

PV = nRT

At STP, the temperature (T) is 273.15 K and the pressure (P) is 100 kPa (or 1 atm).

Since the volume (V) is given as 469 cm³, we need to convert it to liters:

469 cm³ × (1 L / 1000 cm³) = 0.469 L

Now, we can use the Ideal Gas Law formula with R as the ideal gas constant (8.314 J/mol K for kPa, or 0.0821 L atm/mol K for atm):

n = PV / RT

Using the values for atm:

n = (1 atm × 0.469 L) / (0.0821 L atm/mol K × 273.15 K)

n ≈ 0.0209 mol

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Answer:

Carbon dioxide, when present in sufficient amounts, will bind with water to form carbonic acid, which is capable of dissociating into bicarbonate and hydrogen ions.

Explanation:

With the help of carbonic anhydrase which further catalyzes the reaction to convert carbonic acid back into carbon dioxide and water. The carbon dioxide is then expelled from the lungs.

Answer:

Colony

Explanation:

The phase particles are directly dependent on all of these EXCEPT

Viscosity.

A phase is a discrete and uniform state of a system without a clearly defined boundary dividing it into constituent components. Whatever the ratios you employ, water and alcohol are completely miscible when combined. There is only one phase in the resulting combination (a solution). The boundary between water and oil, which ordinarily are immiscible and form a two-phase system, is apparent. Sometimes it is difficult to "see" the border, and you must use scientific reasoning to determine the system's number of phases. Phase and viscosity have no connection. It's connected to the other three. The resistance of a fluid (liquid or gas) to a change in shape or motion of adjacent sections relative to one another is known as viscosity. Viscosity is a sign of disagreement.

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Answer:

\(\boxed {\tt D. \ Hydrogen}\)

Explanation:

An element has a uniform composition, cannot be broken down by chemical change, every atom has the same atomic number, and can be found on the Periodic Table.

Water is made of hydrogen and oxygen atoms (H₂O) so it is not an element.

Table salt is made of sodium and chloride atoms (NaCl) so it is not an element.

Iron oxide is made up of iron and oxygen atoms, so it is not an element.

Hydrogen is an element. It can be found on the Periodic Table as element H.

The correct answer is D. Hydrogen

Answer:

nitrogen 78%, Oxygen 21%, Argon 0.9%, Carbon dioxide 0.03%, water 0-4%(depends)

Explanation:

Answer:

definition: The atmosphere is composed of a mix of several different gases in differing amounts. The permanent gases whose percentages do not change from day to day are nitrogen, oxygen and argon. Nitrogen accounts for 78% of the atmosphere, oxygen 21% and argon 0.9%.

Explanation:

Nitrogen accounts for 78% of the atmosphere, oxygen 21% and argon 0.9%. Gases like carbon dioxide, nitrous oxides, methane, and ozone are trace gases that account for about a tenth of one percent of the atmosphere.

Layers of the atmosphere:

- From lowest to highest, the major layers are the troposphere, stratosphere, mesosphere, thermosphere and exosphere

Answer:

Is the state in which both reactant and products are present in concentration which have no further tendency to change with time: biochemical reaction ;no net change in the amounts of reactants and products occurs

Answer:

The answer is no. C. Rate =[A] [B]

To calculate the molality of a solution, we need to know the number of moles of solute per kilogram of solvent. Therefore, the molality of the solution is 0.506 mol/kg.

The substance that typically determines the solution's physical state is the solvent (solid, liquid or gas). The substance that dissolves in the solvent is known as a solute. For instance, in a solution of salt and water, salt serves as the solute and water as the solvent.

Here's how we can calculate the molality of the given solution:

Step 1: Calculate the number of moles of cobalt (II) nitrate

The molar mass of cobalt (II) nitrate is 194.99 g/mol. Therefore, the number of moles of cobalt (II) nitrate dissolved in 49.4 grams can be calculated as follows:

moles of Co(NO3)2 = mass ÷ molar mass

moles of Co(NO3)2 = 49.4 g ÷ 194.99 g/mol

moles of Co(NO3)2 = 0.253 moles

Step 2: Calculate the mass of water

The mass of 500 ml of water can be calculated as follows:

mass of water = volume of water × density of water

mass of water = 500 ml × 1 g/ml

mass of water = 500 g

Step 3: Calculate the molality

Now we can calculate the molality of the solution using the following formula:

molality = moles of solute ÷ mass of solvent in kilograms

mass of solvent in kilograms = mass of water ÷ 1000

molality = 0.253 moles ÷ (500 g ÷ 1000)

molality = 0.506 mol/kg

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Answer:

true

Explanation:

its A

The above statement is considered to be correct and true.

The Occupational Safety and Health Administration (OSHA) is a federal agency that is saddled with the responsibility of assuring and ensuring a safe and healthy working conditions for an employee or group of employees by doing the following;

According to the Occupational Safety and Health Administration (OSHA), trainings on the adoption and application of safety precautions (tools) such as wearing a personal protective equipment (PPE); face masks (respirators), ear plugs, safety boots, gloves, helmet, etc., are very important and are essentially to be used by all employees (workers) while working in hazard prone environments or industries.  

However, when an employee fails to strictly adhere to the recommended OSHA safety precautions, he or she is more likely to sustain a work-related accident or injury from a fall. Thus, this would negatively affect (impact) the employee because it results in him or her being absent from work (time off) and requires some costs to pay for medicals (medical cost).

In conclusion, injuries from work related falls can affect employees by resulting in time off and medical cost.

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Answer: Chromium has a BCC crystal structure, an atomic radius of 0.125 nm, and an atomic weight of 52.00 g/mol.
The theoretical density of chromium, which has a body-centered cubic (BCC) crystal structure, an atomic radius of 0.125 nm, and an atomic weight of 52.00 g/mol, can be calculated using the formula

D = m/V

To begin, we must calculate the volume (V) of chromium. The volume of a BCC crystal structure can be found using the formula

V = a3/2,

where a is the length of the edge of the unit cell. Since, the atomic radius of chromium is 0.125 nm, the edge length of the unit cell is 2 x 0.125 nm = 0.25 nm. Substituting this value into the formula, we get

V = (0.25 nm)3/2 = 0.015625 nm3

Now that we have the volume of chromium, we can calculate its theoretical density. The mass (m) of chromium can be found by multiplying its atomic weight (52.00 g/mol) by its molar mass (1 mol = 6.022 x 1023 g/mol). This gives us

m = 52.00 g/mol x 6.022 x 1023 g/mol = 3.125 x 1025 g.

Substituting this value for mass into the density formula, we get

D = 3.125 x 1025 g/0.015625 nm3 = 2.01 x 1027 g/nm3.

Therefore, the theoretical density of chromium is 2.01 x 1027 g/nm3.

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Answer:

Neon is the most stable, fluorine and carbon too are stable

Explanation:

Answer:

The third choice

Explanation:

The law of conservation of mass tells us that the mass of the reactants and products in a chemical reaction will be equal to one another. Equations follow the law of conservation of mass when they are balanced, which means that they have the same number and type of atoms on each side.

When individual atoms are counted, the third choice has the same number and type of atoms on each side: 1 gallium, three cesium and three fluorine.

Both atoms get one electron and become stable. The periodic table's same group includes the elements fluorine (F) and bromine (Br).

Magnesium will easily give up two electrons and produce magnesium ion in order to achieve a stable electrical state similar to neon. As a result, magnesium will create the ion Mg2+ Mg2 + to meet the octet rule. Due to the fact that losing one electron requires less energy than gaining seven, magnesium loses an electron when it forms with oxygen. It also turns into stable once oxygen receives an electron, creating a full outer shell with eight valence electrons that follow the octet rule.The electrical configuration makes it obvious that the magnesium atom's valence shell has 2 electrons. Due to the incomplete octet of the magnesium atom, it lacks the stable conformation.

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The number of moles of gas in the expanded container would be 0.5 moles.

According to Avogadro's law, an equal volume of gases at the same temperature and pressure will contain the same number of molecules.

Avogadro's law can be mathematically expressed as:

\(v_1/n_1 = v_2/n_2\)

Where \(v_1\) = initial volume, \(v_2\) = final volume, \(n_1\) = the initial number of moles, and \(n_2\) = the final number of moles.

In this case, \(n_1\) = 1.25 moles, \(v_1\) = 25.0 L, \(v_2\) = 10.0 L

Thus, we are to make \(n_2\) the subject of the formula:

\(n_2 = v_2n_1/v_1\)

     = 10 x 1.25/25

     = 0.5 moles

In other words, the number of moles of gas in the expanded container is 0.5 moles.

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Answer: 13.00

Explanation: got it right

A stream's discharge refers to the volume of water passing a fixed point per unit time.

Discharge is an important characteristic of a stream because it helps to determine the flow rate of water and how much water is being transported downstream.

Discharge can be affected by various factors such as the size and shape of the stream channel, the slope of the stream bed, and the amount of precipitation and runoff in the area. Measuring discharge can be done through various methods such as stream gauging and velocity-area methods.

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