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What are elements in the tall columns of the periodic table called?
A. Representative elements
B. Valence elements
C. Atomic elements
D. Period elements

The waves that  has the greatest wavelength is Wavelength shown with 1 wavelength stretched over a long distance.

A wave could be a disturbance or variety that voyages through a medium or space, carrying vitality without transporting matter. Waves can take different shapes and happen totally different sorts of waves, counting mechanical waves and electromagnetic waves.

Mechanical waves require a medium to propagate, meaning they require a substance like water, discuss, or a strong fabric to transmit the wave. Illustrations of mechanical waves incorporate water waves, sound waves, and seismic waves. In these waves, particles of the medium sway or vibrate in a design, exchanging energy from one molecule to another.

Electromagnetic waves, on the other hand, don't require a medium and can travel through vacuum, such as in space. Electromagnetic waves comprise of electric and attractive areas swaying opposite to each other and to the heading of wave engendering. Illustrations of electromagnetic waves incorporate obvious light, radio waves, microwaves, infrared waves, bright waves, X-rays, and gamma beams.

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The new volume of the helium sample at 50°C and 203 kPa would be 6.16 mL.

First we need to use the ideal gas law equation:

PV = nRT

Where

To solve for the new volume, we can use the following steps:

Convert the initial temperature to Kelvin:

T = 20°C + 273.15 = 293.15 K

Use the initial conditions to calculate the number of moles of helium:

n = PV/RT = (203 kPa x 4.5 mL) / (8.314 J/(mol·K) x 293.15 K) = 0.00073 mol

Use the new conditions to solve for the new volume:

V = nRT/P = (0.00073 mol x 8.314 J/(mol·K) x (273.15°C + 50°C)) / 203 kPa = 6.16 mL

Therefore, the new volume of the helium sample at 50°C and 203 kPa would be 6.16 mL.

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The correct answer is B. 8 molecules \(SO_3\). Option B

In the given reaction:

S(s) + \(O_2\)(g) → \(SO_3\)(g)

The stoichiometric coefficient in front of the \(SO_3\)molecule is 8, which indicates that 8 molecules of \(SO_3\)are formed as a product. This coefficient represents the ratio of the number of molecules involved in the reaction.

Option A (8 atoms \(SO_3\)) is incorrect because it only mentions the number of atoms, not molecules. The stoichiometric coefficient does not represent the number of atoms, but rather the number of molecules.

Option C (80.07g \(SO_3\)) is incorrect because it mentions a specific mass. The stoichiometric coefficient does not directly represent the mass of the substance, but rather the relative amount of molecules involved in the reaction.

Option D (32 \(SO_3\)) is incorrect because it mentions a specific volume. The stoichiometric coefficient does not directly represent the volume of the substance, but rather the relative amount of molecules involved in the reaction.

Therefore, the correct way to describe the \(SO_3\)component in the reaction is option B: 8 molecules \(SO_3\). This represents the ratio of the number of molecules of \(SO_3\)that are produced in the reaction.

Option B

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Answer: The phase change for A and B respectively is condensation, freezing.

Explanation:

A process in which gaseous state of a substance converts into liquid state is called condensation.

For example, conversion of steam into water.

A process in which liquid state of a substance converts into solid state is called freezing.

For example, conversion of liquid water into ice.

Thus, we can conclude that the phase change for A and B respectively is condensation and freezing.

Condensation and freezing would be the phase change for A and B respectively.

This is the process in which a liquid becomes solid and is mostly caused by exposure to cool temperatures.

Gaseous substances also have the ability to become liquids through the process known as Condensation. This therefore makes option A the most appropriate choice.

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Answer:

a. Endothermic

b. 26.37kJ/mol

Explanation:

a. As we can see, the temperature of the water is decreasing when the reaction is occurring, that means the reaction is absorbing heat and is endothermic

b. To find the enthalpy we must find the change in heat when 12.1g of KCl are dissolved. Using the equation:

Q = -m*ΔT*C

Where Q is change in heat

m the mass of solution (250g + 12.1g = 262.1g)

ΔT is change in heat (17.1°C - 21.0°C = -3.9°C)

And C is specific heat of the solution (4.184J/g°C assuming is the same than the specific heat of water).

Replacing:

Q = -262.1g*-3.9°C*4.184J/g°C

Q = 4277J = 4.28kJ

As reaction enthalpy is the change in heat per mole of reaction, we must find the moles of 12.1g of KCl:

Moles KCl -Molar mass: 74.55g/mol-:

12.1g KCl * (1 mol / 74.55g) = 0.1623 moles KCl

The reaction enthalpy us:

4.28kJ / 0.1623mol = }

Answer:

this image represents both a crystalline solid [you can tell because it is clearly a solid, and it has a tightly packed/organized into rows layout}

and a pure element [you can tell this because it is pure--meaning that it is not a mixture (which is why it's not classified as a homogenous mixture instead)]

hope this helps!

Answer:

1 and 4

Explanation:

Pure element because it is made by same type of atom.

Crystalline solid because its structure define it as a solid

Answer:

Large temperature and air pressure decrease.

Temperature and air pressure increase.

Explanation:

The correct options about fonts and weather maps are:

Cold fronts appear on weather maps in areas of Large temperature and air pressure decrease.

Warm fronts appear on weather maps in areas of Temperature and air pressure increase.

Similar to a cold front, there is usually a noticeable temperature change from one side of the warm front to the other.

A cold front occurs when colder air replaces warmer air, while a warm front occurs when warmer air replaces cold air.

Thus, the correct options are:

Cold fronts appear on weather maps in areas of Large temperature and air pressure decrease.

Warm fronts appear on weather maps in areas of Temperature and air pressure increase.

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The final volume of the system, given that half of the gas is removed, leaving 0.50 mole in the cylinder and the system is warmed to 900 K is 18.45 liters

From ideal gas equation, we have

PV = nRT

Rearrange

V / nT = R/ P

R / P = Constant

Thus, we have

V₁ / n₁T₁ = V₂ / n₂T₂

Where

With the above formula, we can obtain the final volume of the system as follow:

V₁ / n₁T₁ = V₂ / n₂T₂

12.3 / (1 × 300) = V₂ / (0.5 × 900)

Cross multiply

1 × 300 × V₂ = 12.3 × 0.5 × 900

300 × V₂ = 5535

Divide both side by 300

V₂ = 5535 / 300

V₂ = 18.45 liters

Thus, the final volume of the system is 18.45 liters

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Adding sulfuric acid to water will decrease the pH dramatically.option 4.

Sulfuric acid is a strong acid and is a type of acid rain. When five drops of sulfuric acid are added to a sample of water, the pH of water will decrease dramatically. This is because sulfuric acid is a strong acid that is capable of dissociating completely in water, producing a high concentration of hydrogen ions (H+) and sulfate ions (SO4²-). This increase in hydrogen ion concentration lowers the pH of water and makes it more acidic.Acid rain is a type of rain that has a pH lower than 5.6, which is the normal pH of rainwater. The acidity of acid rain is caused by the presence of strong acids like sulfuric acid and nitric acid. These acids are produced when sulfur dioxide (SO2) and nitrogen oxides (NOx) are emitted into the atmosphere by human activities like burning fossil fuels and industrial processes.When these gases react with water, they form sulfuric acid and nitric acid, respectively, which then fall to the ground as acid rain.

Acid rain can have harmful effects on the environment, including the acidification of lakes and rivers, the degradation of forests and soils, and the corrosion of buildings and monuments.To conclude, when five drops of sulfuric acid are added to a sample of water, the pH of water will decrease dramatically.option 4.

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The decomposition of aspirin (acetylsalicylic acid,\(C_{9} H_{8} O_{4}\)) can occur through the hydrolysis reaction, resulting in the formation of acetic acid (\(CH_{3} COOH\)) and salicylic acid (\(C_{7} H_{6}O_{3}\)).

The decomposition of aspirin (acetylsalicylic acid, \(C_{9} H_{8} O_{4}\)) can occur through the hydrolysis reaction, resulting in the formation of acetic acid (\(CH_{3} COOH\)) and salicylic acid (\(C_{7} H_{6}O_{3}\)). To determine the moles of each product formed, we need to consider the balanced chemical equation for the reaction:

\(C_{9} H_{8} O_{4} = > C_{7} H_{6}O_{3} +CH_{3} COOH\)

From the equation, we can see that for every 1 mole of aspirin, 1 mole of salicylic acid and 1 mole of acetic acid are produced.

Therefore, the moles of salicylic acid and acetic acid formed will be equal to the number of moles of aspirin that decomposes. If we know the amount of aspirin in moles, we can directly calculate the moles of each product based on stoichiometry.

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Answer:

olivine i think

Explanation:

Answer:

See explanation

Explanation:

Conformation refers to the various spatial arrangements of atoms in a molecule that result from free rotation across the carbon-carbon single bond.

There are two possible conformations of cyclohexane. They are; the chair and boat conformations.

We can convert the molecule from one conformation to another by rotation of single bonds.

These conformations are not isomers. Isomers are different molecules while conformers are different spatial arrangements of the same molecule obtained by rotation across carbon-carbon single bonds. Isomers are not obtained by rotation across carbon-carbon single bonds.

Hence, the chair and boat conformers of cyclohexane are obtained by rotation across the carbon-carbon single bond hence they are conformers and not isomers.

Answer:

approximately 251.55 grams of AuCl3 would contain 5.0 x 10^23 molecules.

\(K_{sp}\) of the compound is found to be  5.04 ×\(10^{-10}\).

Solubility :Solubility can be define as the amount of a substance that dissolves or mixes in a given amount of solvent at specific conditions.

Solubility equilibrium

Ksp = \([A^{+} ]^{a}\) \([B^{-} ]^{b}\)

Ksp = solubility product constant

A+ = cation in an aquious solution

B- = anion in an aqueous solution

a, b = relative concentrations of a and b

Given,

Solubility = s = 3.60 × \(10^{-2}\) g/L

molar mass = 288 g/ mol

∴ s= 3.60 × \(10^{-2}\) g/L ÷ 288 g/ mol = 1.25 ×\(10^{-4}\) mol/ L

Reaction:

MX3 ⇄ M + 3X

           s       3s

\(K_{sp}\) =[ \(M^{+3}\)] [ \(X^{-1}\)\(]^{3}\) = solubility product

∴ \(K_{sp}\) =\([s]^{} [3s]^{3}\)

∴ \(K_{sp}\) = 3 \(s^{4}\)

∴ \(K_{sp}\) = 3 × (3.60 × \(10^{-2}\) \()^{4}\)

∴ \(K_{sp}\) = 503.8848 ×\(10^{-8}\)  = 5.04 ×\(10^{-10}\)

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Kinetic energy is a form of energy associated with the motion of particles. When it comes to chemical reactions, kinetic energy plays a crucial role in determining the reaction rate and the ability of particles to undergo chemical changes.

Activation Energy: Chemical reactions require a certain amount of energy to start, known as the activation energy. This energy is necessary to break the existing bonds in reactant molecules and initiate the formation of new bonds in the product molecules.

Collision Theory: According to the collision theory, for a reaction to occur, reactant particles must collide with sufficient energy and proper orientation. Kinetic energy is directly related to the speed of particles, and higher kinetic energy means faster-moving particles that are more likely to collide with enough energy to overcome the activation energy barrier.

Temperature Dependence: Kinetic energy is directly proportional to temperature. Increasing the temperature of a system increases the average kinetic energy of particles. As a result, more particles have sufficient energy to overcome the activation energy barrier, leading to an increased reaction rate.

Reaction Rate: The rate of a chemical reaction is determined by the frequency and effectiveness of collisions between reactant particles. Higher kinetic energy increases the frequency of collisions and also enhances the chances of successful collisions with proper energy and orientation, thereby increasing the reaction rate.

Equilibrium: In reversible reactions, the forward and backward reactions reach equilibrium when the rates of the two reactions become equal. At equilibrium, the average kinetic energy of the particles remains constant, indicating a balance between the forward and backward reactions.

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Answer:

60g of LiNO3 are required

Explanation:

Calculate the amount of solute, in grams or milliliters, to prepare...

The percentage mass/volume %(m/v) is defined as the mass in grams of the solute in 100mL of solution

To solve this question we must know that in a 37.5% (m/v) of LiNO3 you have 37.5g of LiNO3 in 100mL of solution.

Thus, to prepare 160mL are required:

160mL * (37.5g / 100mL) =

When a strong acid or base is added to water, the pH will change dramatically.

A strong acid is one that is completely dissociated or ionized in an aqueous solution. This means it gives off the greatest number of hydrogen ions or protons when placed in a solution. Examples of strong acid are HCl, HBr, H2SO4, HNO4. These acids when placed in water, produces greatest amount of hydrogen ions. The pH value changes drastically. Any that has very high concentration of hydrogen and ion is acidic.

Also when base is added to water, the pH of water will increase above 7 and become basic. The pH of water is 7, but when base is added to it increases above 7.

Base is any solution that is slippery to touch in water solution, changes color, react with acid to form salt and change red litmus paper to blue.

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The volume occupied by one mole of gas at stp is known as the standard molar volume of a gas. It has been found to be 22.41410 L. According to Avagadro's law, one mole of any gas will occupy the same volume as one mole of any other gas at the same temperature and pressure, despite mass difference. Knowing the volume of gas, you can use 1 mol/22.4L as a conversion factor to find the number of moles, and therefore the mass, of a given volume of a given gas at STP.

Behaviour of gases:

‎ㅤ‎ㅤ‎ㅤ ➝ PV = KT

2-chloroethanol is more acidic than ethanol due to presence of an electron - withdrawing group.

Basically, out of 2-chloroethanol and ethanol, 2-chloroethanol is more acidic in nature tan ethanol due to the presence of an electron withdrawing group i.e., chlorine atom. Due to the presence of the electron withdrawing group it results in negative inductive effect and thus, the electron density in the –O-H bond decreases significantly and the O-H bond present in the 2-chloroethanol becomes weaker than O-H bond present in the ethanol.

This stabilizes the alkoxide ion and therefore, 2-chloroethanol can easily release a proton and becomes more acidic.

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Geologic columns are layers of rock that have been laid down over the past millions or billions of years. Many of these columns were formed on ancient sea or ocean floors as a result of the uniformatarianism.

Uniformitarianism assumes that the current processes which  exist in the universe are the same processes which  have existed in the past era and is a prime assumption for many scientific theorems  which are present .When dealing with geologic columns and the dating of the layers in said columns, assumption is made  that the processes that laid down these layers in the past are the same processes that are  observed today which means that the layers were laid down in a manner that is predictable. This means that  assumptions  can be made about the age and the method of formation of the geologic column based on  the observed knowledge of current processes.

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Answer:

Rock A will have far more chemical weathering than Rock B due to the rise in area effect

Explanation:

Rock A undergoes both Physical and Chemical weathering. So, thanks to physical weathering there'll appear cracks within the rock, which can, in turn, increase the area of rock on which weathering is occurring. So, Chemical weathering will happen much faster now as there's a rise in the area. within the case of Rock B, there's only chemical weathering therefore the increase in the area won't be that very much like compared to Rock A.

Answer: The Styrofoam cooler kept the water coolest over two hours.

Explanation: From the graph, it is clear that the temperature of the water in the Styrofoam cooler remained the lowest throughout the experiment, and hence, it can be concluded that the Styrofoam cooler kept the water coolest over two hours. The temperature of the water in the insulated bag and plastic cooler both increased more rapidly than in the Styrofoam cooler, indicating that they are not as effective at keeping drinks cool. Therefore, the answer is option C.

To solve this question, we need to use the combined gas equation which is given as

Now we should write down the given data

So, we would use the previous equation i wrote down.

From the calculations above, the final pressure of the gas is 1659.28mmHg

The best explains why Georgia has regulations on the number of specific fish that can be caught daily is because overfishing.

Overfishing affects the natural balance of the oceans, destabilizing the food chain, disrupting local ecosystems and destroying marine habitats for marine life. It is a threat to all marine biodiversity, not only to target species, but also to bycatch.

By definition, fishing is any and all act with the objective of removing, harvesting, catching, extracting or capturing any fishery resources in aquatic environments, and may be carried out in a scientific, economic, commercial, sporting or subsistence nature.

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Answer:

acid and rain

Explanation:

acid rain

Answer:

acid rain is checimal reaction to sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain. Bascalliy it's because of sulfur dioxide and nitrogen

Explanation:

Answer:

a. A hydrocarbon is any of a class of organic chemicals made up of only the elements carbon (C) and hydrogen (H). The carbon atoms join together to form the framework of the compound, and the hydrogen atoms attach to them in many different configurations.

Answer:

hydrocarbon means that  a compound only contains carbon and hydrogen contain together to form a chain.For example

methane-CH4        Main formula  CnH2n+2

ethane- C2H6        methane empirical formula CH4

propane=C3H8      Methane molecular formula  CH4  

ethane empirical formula - C2H6

ethane molecular formula  CH3-CH3    (C2H6)

propane empirical formula  C3H8

propane molecular formula CH3-CH2-CH3   (C3H8)

Explanation:

The 2 isotopes of Nitrogen are Nitrogen-14  and Nitrogen-15 .

Isotopes are atoms with the same number of protons and different number of neutrons. Even though they have nearly identical chemical properties, they differ in mass which affects their physical properties.

As you know, the atomic number of nitrogen is = 7.

Isotopes are forms of elements that have the same atomic number (Z) but different mass numbers because they have different numbers of neutrons (A).

Now,

Atomic number = number of protons

Isotopes have the same atomic number.

Atomic number for both isotopes = 7. However, the mass numbers of the two isotopes are different.

In other words, the mass number = the number of (protons + electrons).

Therefore, nitrogen-14 has a mass number of 14 and nitrogen-15 has a mass number of 15.

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Answer:

The molarity of the sulfuric acid in the solution is 1.77 M.

Explanation:

The molarity of the sulfuric acid in the solution can be found using the following equation:

\( C_{i}V_{i} = C_{f}V_{f} \rightarrow C_{f} = \frac{C_{i}V_{i}}{V_{f}} \)    

Where:

\(C_{i}\): is the initial concentration of the acid

\(V_{i}\): is the initial volume of the solution = 22.6 cm³

\(V_{f}\): is the final volume of the solution = 88.5 cm³

The initial concentration of the H₂SO₄ is:

\( C_{i} = \frac{n}{V} = \frac{m}{M*V} = \frac{d*\% ^{m}_{m}}{M} \)

Where:

n: is the number of moles

m: is the mass

M: is the molar mass = 98.079 g/mol

d: is the density of the acid = 1.39 g/cm³

%: is the percent by mass = 49.0 %

\( C_{i} = \frac{1.39 \frac{g}{cm^{3}}*\frac{1000 cm^{3}}{1 L}*\frac{49 g}{100 g}}{98.079 \frac{g}{mol}} = 6.94 M \)          

Finally, the final concentration of H₂SO₄ after the dilution is:

\( C_{f} = \frac{6.94 M*22.6 cm^{3}}{88.5 cm^{3}} = 1.77 M \)

Therefore, the molarity of the sulfuric acid in the solution is 1.77 M.

I hope it helps you!

The measure of the length of events and the duration of intervals between events is time.

The duration of events or the gaps between them can be measured, compared, or even ordered using time. The lengthy period of time that the Earth's geologic history takes up is known as geologic time. Starting at the beginning of the Archean Eon  formal geologic time runs until the present. Geology is defined as the "Science of the Earth."

Geology is the fundamental Earth science that examines how the earth created, its structure and composition, and the various forces acting on it. It is sometimes known as geoscience or earth science.

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