A black rock has a mass of 12.5 grams. When dropped into a graduated cylinder, the volume rises from 20 ml to 24 ml. What is the density of the rock?

When observing non-ideal gas behavior, the physical quantities that can vary are: c) pressure and volume.
Non-ideal gases deviate from the ideal gas law (PV=nRT) due to intermolecular forces and the actual volume of the gas particles, which are not considered in the ideal gas law. As a result, both pressure and temperature can affect the behavior of a non-ideal gas.

Non-ideal gas behavior is observed when a gas does not follow the ideal gas law, which assumes that gas molecules are point masses with no volume and no interactions with each other. Physical quantities such as pressure, volume, temperature, and number of moles can vary in non-ideal gas behavior due to factors such as intermolecular forces, molecular size, and deviations from ideal gas behavior at high pressures or low temperatures. These variations can lead to changes in gas behavior, such as changes in compressibility, heat capacity, and reaction rates. Understanding non-ideal gas behavior is important in many fields, including chemistry, physics, and engineering.

Thus the correct option is (c) pressure and volume.

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Complete question is;

Water flows over Niagara Falls at the average rate of 2,400,000 kg/s, and the average height of the falls is about 50 m. Knowing that the gravitational potential energy of falling water per second = mass (kg) x height (m) x gravity (9.8 m/s²), what is the power of Niagara Falls? How many 15 W LED light bulbs could it power?

Answer:

A) Power of Niagara Falls = 1.176 × 10⁹ W

B) 78.4 × 10⁶ bulbs

Explanation:

A) We are given;

The mass flow rate of Niagara falls = 2,400,000 kg/s

The average height of the fall = 50 meters

Gravitational potential energy = mass (kg) x height (m) x gravity (9.8 m/s²)

Now, formula for power is; workdone/time taken.

Thus it's potential energy/time taken.

Hence;

Power = (mass (kg) x height (m) x gravity (9.8 m/s²))/time(s)

We know that mass/time is mass flow rate.

Thus; power = mass flow rate (kg/s) × height (m) × gravity (9.8 m/s²)

Thus;

Power of Niagara Falls = 2400000 × 50 × 9.8 m/s²

Power of Niagara Falls = 1.176 × 10⁹ W

B) The number(n) of 15 W LED light bulbs Niagara falls could power is given by the relationship;

n × 15 W = 1.176 × 10⁹ W

Thus;

n = 1.176 × 10⁹ W/(15 W)

n = 78.4 × 10⁶ light bulbs

The number of 15 W LED light bulbs Niagara falls could power = 78.4 × 10⁶ bulbs

Answer:

AlCl3 + 3Na > Al + 3NaCl

Explanation:

AlCl3+Na → Al + NaCl

Al =1 Al=1

Cl =3 Cl = 1

Na=1. Na = 1

so balance

and it would be

Alcl3 + 3Na → Al + 3NaCl

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume = 325 mL

density = 0.874 g/mL

We have

mass = 325 × 0.874

We have the final answer as

Hope this helps you

Answer:

Gay-Lussac’s law

Explanation:

Gay-Lussac’s law is one of the gas laws discovered and proposed by a French scientist called Joseph Gay Lussac (1778 - 1850). In this law, it is stated that the pressure (P) of a gas varies directly with the absolute temperature (T) at a constant volume.

That is;

: P ∝ T

: P/T = K

Where:

P = pressure exerted by the gas

T = absolute temperature of the gas

K = the constant.

Hence, according to this question, the law that states that "the pressure and absolute temperature of a fixed quantity of gas are directly proportional under constant volume conditions" is Gay-Lussac’s law.

Answer:

D. Gay-Lussac’s law

Explanation:

have a great day :)

Single and  double replacement chemical reactions are similar by the fact that in both the types of reactions replacement of ions takes place in case of single displacement it is 1 ion while for double displacement it is 2 ions.

Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.

There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction, there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical reactions:

1) inorganic reactions

2)organic reactions

3) biochemical reactions

During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

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Based on the information provided in the student question, we can deduce the structure of the unknown compound step-by-step:

1. The molecular formula C6H14O indicates that the compound contains 6 carbon atoms, 14 hydrogen atoms, and 1 oxygen atom.

2. Since the compound is a liquid at room temperature and slightly soluble in water, it suggests the presence of a polar functional group, such as an alcohol (OH) group.

3. The reaction with sodium metal and the evolution of gas indicates that the compound likely contains an acidic hydrogen atom, which further supports the presence of an alcohol group.

Now, considering the possible constitutional isomers for the given molecular formula:

- Hexanol isomers (1-hexanol, 2-hexanol, 3-hexanol, etc.): These would all show a similar H-NMR spectrum due to the similar structure, and would meet the requirements of a liquid at room temperature and reacting with sodium metal to release gas.

- Methylpentanol isomers (2-methyl-2-pentanol, 3-methyl-2-pentanol, etc.): These isomers would also show similar H-NMR spectra, but would differ slightly from the hexanol isomers.

To assign a specific structure to the unknown compound, we would need more information about the H-NMR spectrum, such as peak positions, splitting patterns, and integration values. This additional data would help to identify the exact positions of the alcohol group and any branching in the carbon chain, allowing us to distinguish between different constitutional isomers.

Answer:

white phosphorus is P4 in a tetrahedral shape and there are some really cool videos of it reacting in air and some not very cool ones where it was used militarily it is not stable, it needs to be stored underwater

red phosphorus is a larger more complicated network solid with many more phosphorus and is very stable

they are allotropes of phosphorus

Explanation:

Answer:

All of our energy comes from the sun.

Explanation:

The sun sends out huge amounts of energy through its rays every day. Without the sun, life on earth would not exist, since our planet would be totally frozen.

The LUMO for the reaction when an ester is mixed with \(LiNHCH_{3}\) is D. C-O π* bond.

In the SNAc (nucleophilic acyl substitution) mechanism, the nucleophile (LiNHCH_{3}) attacks the carbonyl carbon of the ester, and the LUMO in this reaction is the lowest unoccupied molecular orbital, which is the C-O π* bond.

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the most unique property of carbon is its ability to form four bonds.

Carbon is unique in its ability to form four covalent bonds with other atoms, including other carbon atoms. This ability allows for the formation of long chains, rings, and complex structures, making carbon the basis for all life on Earth. Carbon can also form double or triple bonds, allowing for even more diversity in the types of molecules that can be created. While nitrogen and oxygen can also form multiple bonds, carbon's ability to form four bonds is what sets it apart.

Carbon has four valence electrons, which allows it to form four covalent bonds with other atoms. This property enables carbon to create a wide variety of complex molecules, including forming long chains and rings by bonding to other carbon atoms. This versatility is crucial for the formation of various organic compounds and is a key reason why carbon is the backbone of life on Earth.

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Answer:

d

Explanation:

because nuclear charge ( no. of protons) increases

Answer:

Explanation:

To find the volume when the pressure is at 202.6 kPa we use Boyle's law which is

\(P_1V_1 = P_2V_2\)

where

P1 is the initial pressure

P2 is the final pressure

V1 is the initial volume

V2 is the final volume

Since we are finding the final volume

\(V_2 = \frac{P_1V_1}{P_2} \\\)

From the question

P1 = 99.3 kPa = 99300 Pa

V1 = 455 cm³

P2 = 202.6 kPa = 202600

So we have

\(V_2 = \frac{99300 \times 455}{202600} = \frac{45181500}{202600} \\ = 223.008390...\)

We have the final answer as

Hope this helps you

A liquid at 50 degrees Celsius would have a melting point of 50 degrees Celsius and a boiling point of approximately 173.15 degrees Celsius.

What is the liquid?

iquid is a state of matter that has a definite volume, but does not have a fixed shape. It is one of the four fundamental states of matter, along with solid, gas, and plasma. Liquids tend to have a greater volume than solids, but geneLrally take the shape of their container. Examples of liquids include water, milk, blood, gasoline, and oil. Liquids are composed of molecules that tend to have greater mobility and can easily flow past each other. Depending on the temperature, pressure, and composition of the liquid, it can undergo changes in the state of matter.

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The number of moles of a substance can be used to calculate its mass, the number of atoms present in the compound as well as the number of moles of individual atoms/ions in the compound.

The number of moles of a compound or ion is defined as the ratio of its mass to its molar mass. The number of moles of a substance is very important when performing stoichiometric calculations.

If you have the number of moles of  a substance you can find;

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Answer:

D

\( \: \: \: \: \)

Answer:

I solved the questions then counted how many significant figures in each answer

eg,

0.042m+1.33m =1.372m

1.372 has 4 significant figures

that's how you do others

Explanation:

6. 1.372m = 4 significant figures

7. 4.345g = 4 significant figures

8. 12L = 2 significant figures

9. 27.3cm = 3 significant figures

10. 0.975 = 3 significant figures

The mineral presented in the image has a metallic luster. It is opaque, which means that it is not clear and light does not pass through it. It also has cleavage, which refers to the tendency of a mineral to break along planes of weakness.

The cleavage is evident in the image, as the mineral appears to have flat, smooth surfaces that intersect at sharp angles when it is broken or fractured.Cleavage is one of the most important properties of a mineral because it provides information about the way in which the mineral will break when subjected to external forces.

A mineral with good cleavage will break into pieces that have a smooth, flat surface, while a mineral with poor cleavage will break into pieces that have an uneven surface. This property is often used by mineralogists to help identify minerals since it is unique to each mineral.

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The mineral’s luster, opacity, and cleavage define its properties. Metallic luster means it reflects light like metal, opacity implies no light passes through it, and cleavage speaks to how it breaks.

In order to determine the characteristics of a mineral, we assess attributes such as the mineral's luster, opacity, and cleavage. The metallic luster refers to how light interacts with the surface of a mineral, metallic luster means the mineral reflects light as a polished metal would.

When a mineral is opaque, it means that light does not pass through it at all - it is not transparent or translucent. Lastly, a mineral's cleavage refers to how it breaks or fractures along distinctive planes. To accurately describe the mineral in the image, these three characteristics would need to be observable.

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Arsenic-84 decays with an energy of 1.57×10^-15 kJ/nucleus, which is equivalent to 9.80×10^3 eV (electron volts) and 9.80 MeV (mega electron volts).


To convert the energy into electron volts, follow these steps:
1. Convert kJ to Joules: 1.57×10^-15 kJ × 10^3 J/1 kJ = 1.57×10^-12 J.
2. Convert Joules to electron volts using the conversion factor: 1 eV = 1.602×10^-19 J. Divide the energy in Joules by this conversion factor: (1.57×10^-12 J) / (1.602×10^-19 J/eV) = 9.80×10^3 eV.

To convert the energy into MeV, follow these steps:
1. You already have the energy in eV from the previous calculation (9.80×10^3 eV).
2. Convert eV to MeV using the conversion factor: 1 MeV = 10^6 eV. Divide the energy in eV by this conversion factor: (9.80×10^3 eV) / (10^6 eV/MeV) = 9.80 MeV.

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Answer:

10

Explanation:

the volume of C2H2 reacted with 25 moles of O2

9.85L of ethyne is needed to react with 25 L of oxygen for the reaction at STP.

The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.

A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.

Given,

Volume of oxygen = 25 L

We know that 1 mole of a gas occupies 22.4 L of volume

So, 25L is occupied by 1.11 moles of oxygen.

From the reaction, 5 moles of oxygen needs 2 moles of ethyne.

1 mole of oxygen would need 2/5 moles of ethyne

Thus, moles of ethyne needed = ( 2 / 5) × 1.11

= 0.44 moles

Volume of ethyne needed = 0.44 × 22.4 = 9.85 L

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Water, a naturally occurring and vital component for life on Earth, is really known chemically as dihydrogen monoxide (DHMO). When consumed in moderation, it is not dangerous.

The claim you made appears to be a well-known internet hoax that has been circulated for a while. It is frequently used in jokes and satire to highlight how quickly false information and fear-mongering can spread.

It is crucial to rely on reliable sources and scientific facts when analyzing information, especially when it comes to health and safety, to address your concern. To assist people in recognizing and avoiding misleading or inaccurate information, it is also crucial to encourage critical thinking and media literacy.

In other words, since dihydrogen monoxide is a fundamental substance required for existence, there is nothing to "repair" in regard to it. Instead, in order to assure accurate and trustworthy knowledge, we should concentrate on information verification and the advancement of scientific literacy.

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Please find the terms with their correct description in the explanation section.

In an aqueous solution, an electrolyte is a material that separates or ionizes into cations (positively charged ions) and anions (negatively charged ions). Depending on how well it ionizes and how much conductivity it has, an electrolyte can be either strong or weak. A non-electrolyte, however, does not conduct electricity or ionize in a solution.

Based on this;

1. Weak electrolyte: Has a medium level of conductivity i.e. partially conducts electricity

2. Strong electrolyte: Contains a complete solute

3. Non-electrolyte: Has little or no conductivity i.e. cannot conduct electricity because it doesn't dissociate into ions.

4. Strong electrolyte: Has the highest conductivity i.e. conducts electricity very well.

5. Strong electrolyte: Contains a completely dissociated solute i.e. the solute of the electrolyte separates into anions and cations completely.

6. Weak electrolyte: Contains a partially dissociated solute i.e. the ions of the solute do not ionize completely in the solution.

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The compound that is hydrolyzed most slowly in aqueous NaOH is e) R−C−OCH2. Aryl ethers tend to be more stable and less reactive towards hydrolysis compared to esters, amines, ethers, and chloroalkanes.

To determine which compound is hydrolyzed most slowly in aqueous NaOH, we need to consider the reactivity of the functional groups present in each compound. The hydrolysis rate is influenced by the stability of the intermediate formed during the hydrolysis reaction.

Among the given compounds, the most stable intermediate would result in the slowest hydrolysis rate. Let's analyze each compound:

a) R−C−O−C−CH3 (oxygen double bonded to each C): This compound contains ester functional groups. Esters undergo hydrolysis, forming carboxylic acids and alcohols. The hydrolysis rate of esters is typically faster than that of other functional groups.

b) R−C−NH2 (oxygen double bonded to C): This compound contains an amine functional group. Amines do not undergo hydrolysis under aqueous NaOH conditions.

c) R−C−OCH3 (oxygen double bonded to the first C starting from the left): This compound contains an ether functional group. Ethers do not undergo hydrolysis under aqueous NaOH conditions.

d) R−C−Cl (oxygen double bonded to C): This compound contains a chloroalkane functional group. Chloroalkanes do not undergo hydrolysis under aqueous NaOH conditions.

e) R−C−OCH2 (oxygen double bonded to the first C starting from the left with a benzene ring attached to CH2): This compound contains an aryl ether functional group. Aryl ethers are generally resistant to hydrolysis under aqueous NaOH conditions.

Based on the analysis, the compound that is hydrolyzed most slowly in aqueous NaOH is e) R−C−OCH2. Aryl ethers tend to be more stable and less reactive towards hydrolysis compared to esters, amines, ethers, and chloroalkanes.

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Answer:

J.J. Thomsons model represents the structure of an atom.

J.J. Thomson's experiments with cathode-ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Thomson proposed the plum pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged particles.

Answer:

No, it should sink

Explanation:

Answer:

Mercury is an liquid metal

Explanation:

Mercury is a chemical element with the symbol Hg and atomic number 80. It is commonly known as quicksilver and was formerly named hydrargyrum.

Symbol: Hg

Answer:

orbitals

Explanation: