NEED SOME HELP ASAP!!!!!!
Part A: Identify the oldest rock layer shown in the diagram. Be sure to explain your reasoning.

Part B: Scientists think that the trilobite fossil found only in layer d became extinct soon after layer d was formed. Using evidence from the cross-section, explain why this statement is true or not.

simple answer don't need to much tbh

After 4 seconds, the ball would be traveling at a speed of approximately 39.2 meters per second. This can be calculated using the formula for acceleration due to gravity v = gt, where v is the final velocity, g is the acceleration due to gravity (9.8 m/s^2), and t is the time (4 seconds in this case). So, v = 9.8 m/s^2 x 4 s = 39.2 m/s.

If there were air resistance, the speed of the ball would decrease. Air resistance is a force that opposes the motion of an object as it moves through the air. It can cause the ball to slow down over time, as it experiences friction with the air molecules around it. The amount of air resistance depends on several factors, such as the size and shape of the ball, the density of the air, and the speed of the ball. In general, the faster the ball is moving, the greater the air resistance it will experience.

To find the speed of the ball after 4 seconds, we can use the formula v = gt, where v is the final velocity, g is the acceleration due to gravity (approximately 9.8 m/s²), and t is the time in seconds. In this case, t = 4 seconds. Step 1: Multiply the acceleration due to gravity (g) by the time (t) ,v = 9.8 m/s² * 4 s ,Step 2: Calculate the final velocity (v):
v = 39.2 m/s If air resistance was present, the ball's speed would be lower. Air resistance creates a drag force that opposes the motion of the ball, causing it to decelerate more than if there was no air.

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At the new point in the atmosphere, the volume of the balloon increases to 1.95 L due to the decrease in pressure. The decrease in temperature has no effect on the volume of the balloon.

Atmosphere is the gaseous layer surrounding the earth. It is composed of nitrogen (78%), oxygen (21%), argon (0.9%) and other trace gases. The atmosphere also contains water vapor, which varies in concentration from place to place and time to time. The atmosphere plays a vital role in regulating the earth's climate and is essential for life. It also acts as a barrier to cosmic rays, ultraviolet radiation, and other forms of radiation from outer space. The atmosphere consists of five main layers, the troposphere, stratosphere, mesosphere, thermosphere, and exosphere.

We are given the following values:

P₁ = 1.00 atm (initial pressure)

V₁ = 1.00 L (initial volume)

T₁ = 23.0°C + 273.15 = 296.15 K (initial temperature)

P₂ = 220 torr (final pressure)

T₂ = -31°C + 273.15 = 242.15 K (final temperature)

We need to convert the units to be consistent, so we convert the final pressure to atm:

P₂ = 220 torr / 760 torr/atm ≈ 0.289 atm

Now we can substitute the values into the combined gas law equation:

(1.00 atm × 1.00 L) / (296.15 K) = (0.289 atm × V₂) / (242.15 K)

Simplifying the equation and solving for V₂:

V₂ = (1.00 L×  0.289 atm ×  242.15 K) / (296.15 K)

V₂ ≈ 0.237 L

Therefore, the new volume of the balloon at the new altitude is approximately 0.237 L.

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Answer:

It breaks down food to create energy

Tin is not easily oxidized and resists corrosion because it is protected by an oxide film. Tin resists corrosion from distilled sea and soft tap water, and can be attacked by strong acids, alkalis and acid salts. Tin is used in for can coating: tin-plated steel containers are widely used for food preservation.

What happens when tin reacts with acid?

Characteristics: Metallic tin is soft and malleable. It slowly dissolves in dilute nonoxidizing acids or more readily in hot concentrated HCl. It reacts with HNO3 to form metastannic acid, H2SnO3, a white substance insoluble in alkalies or acids.

Tin can it oxidize things?

A reducing agent is TIN(II) OXIDE. due to slow oxidation to tin(IV) oxide, unstable in air. This oxidation starts to burn incandescently at 300 °C. powerful oxidizing agents incompatible.

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Answer:

Black

Explanation:

White color reflects visible light while Black absorbs all light, and gives heat, so the answer is Black!

The flow of chilled water through the cooling coil is regulated by a control valve.

In HVAC systems, the flow of chilled water through the cooling coil is regulated by a device called a control valve. The control valve is responsible for adjusting the flow rate of chilled water based on the cooling demand of the system. It ensures that the right amount of chilled water is supplied to the cooling coil to maintain the desired temperature in the conditioned space.

The control valve is typically controlled by a building automation system or a thermostat. These devices monitor the temperature in the conditioned space and send signals to the control valve to open or close. When the temperature rises above the set point, the control valve opens to allow more chilled water to flow through the cooling coil, cooling the air. Conversely, when the temperature falls below the set point, the control valve closes to reduce the flow of chilled water.

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The flow of chilled water through the cooling coil is regulated by a control valve. This valve adjusts the flow rate based on the cooling needs of the system.

A thermostat or temperature sensor provides signals to the control valve, which opens or closes accordingly.

When the temperature exceeds the desired setpoint, the control valve opens, allowing more chilled water to pass through the cooling coil.

This increases cooling capacity and lowers the air or space temperature.

Conversely, the control valve closes when the temperature reaches or falls below the set point, reducing chilled water flow.

The control valve ensures precise temperature control and efficient cooling operation in the system.

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The first two chemical equations are reversible while the other two are irreversible.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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Answer:

53.8g

Explanation:

plz let me know if the answer is right than I can explain it to u :)

An atom which an electron moves from the first to the third shell atom absorbs more energy.

An atoms may occupy different energy states . The energy states are discrete , that means they occur at specific values only. Therefore an atom can only move to a new energy level if it absorbs or emits an amount of energy that exactly corresponds to the difference between two energy levels.

The lowest possible energy levels that the atom can occupy is called ground state.The energy levels which is higher to the ground state is called excited state.

The more energy absorb when electron move from first to third because in this second energy level have to pass to reach at third energy level.

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the answer is Ethane

hope it helps...!!!

the answer is Ethane

hope it helps...!!!

Answer: The author used the word "conversely" because the first statement he made is in CONTRAST to the second statement he made.

Explanation:

Matter is made up of atoms or molecules that are in constant motion. The motion of these tiny particles ( molecules) gives the object energy. The movement of these molecules depends on the state of matter which includes

--> GASEOUS STATE: Here, the particles are completely free to move and are always in motion.

--> LIQUID STATE: particles in this state slide by one another and are always in motion.

--> SOLID STATE: particles in this state are held tightly together but are always in motion.

Also, the molecules in motion are greatly affected by temperature changes. Increase in temperature will cause the particles in the liquid to move faster. Such is seen when soup is heated, the molecules travel faster than before. But the OPPOSITE is seen in an ice cube. This is because the ice cube is in solid state and of a lower temperature.

The molarity of the K2CrO4 solution would be 0.001254 M.

The molarity of a solution is defined as the number of moles of solute per liter of solution. To calculate the molarity of the K2CrO4 solution, we need to first determine the number of moles of K2CrO4 present in the 184.6 mg sample.

Calculate the number of moles of K2CrO4:

The molar mass of K2CrO4 is 294.19 g/mol.

mass of K2CrO4 = 184.6 mg = 0.1846 g

number of moles = mass/molar mass

number of moles = 0.1846 g / 294.19 g/mol = 0.000627 mol

Calculate the volume of the solution in liters:

We are given that the solution is made up to a final volume of 500.0 mL. To convert milliliters to liters, we divide by 1000.

volume = 500.0 mL ÷ 1000 mL/L = 0.500 L

Calculate the molarity:

Molarity = number of moles / volume of solution

Molarity = 0.000627 mol / 0.500 L = 0.001254 M

Therefore, the molarity of the K2CrO4 solution is 0.001254 M.

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Calculate the molarity. A 184.6-mg sample of K2CrO4, is dissolved in enough water to make 500.0 mL of solution.

BaSO₄ is safe to ingest because of its low solubility in water and limited release of Ba²⁺ ions. The sparing solubility of BaSO₄ ensures that only a minimal amount of Ba²⁺ ions are present, reducing the risk of toxicity. This property makes BaSO₄ an effective and safe contrast agent for obtaining X-ray images of the gastrointestinal tract.

BaSO₄ (barium sulfate) is safe to ingest because it has very low solubility in water, meaning it does not readily dissolve into Ba²⁺ ions in the gastrointestinal tract. This property is crucial for its use in medicine to obtain X-ray images of the gastrointestinal tract.

When BaSO₄ is ingested, it remains mostly undissolved as a solid in the gastrointestinal tract. Only a small fraction of BaSO₄ will dissolve, leading to the release of a negligible amount of Ba²⁺ ions into the surrounding solution. The concentration of Ba²⁺ ions in the gastrointestinal tract remains extremely low due to the limited solubility of BaSO₄.

The toxicity of barium arises primarily from the presence of Ba²⁺ ions in the body, which can interfere with various physiological processes. However, since BaSO₄ does not readily dissociate into Ba²⁺ ions, the amount of toxic Ba²⁺ ions released into the body from ingested BaSO₄ is extremely minimal. As a result, the risk of toxicity or harm from ingesting BaSO₄ is negligible.

The principle that governs the limited solubility of BaSO₄ is the common ion effect. The common ion effect states that the solubility of a sparingly soluble salt is decreased in the presence of a common ion, which in this case is the Ba²⁺ ion. When BaSO₄ is ingested, the presence of Ba²⁺ ions already in the body (such as from dissolved barium salts) further decreases the solubility of BaSO₄, making it even less likely to dissolve and release toxic Ba²⁺ ions.

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109.1 mL of 0.3850 M HCl is required to neutralize 60.00 mL of 0.7000 M KOH.

To calculate the volume of 0.3850 M HCl required to neutralize 60.00 mL of 0.7000 M KOH, the following is the solution:

First, calculate the amount of KOH that reacted with HCl using the following formula: Moles of KOH = Molarity x Volume = 0.7000 M x 60.00 mL = 0.04200 mol.

Now that the amount of KOH has been determined, it is time to determine how much HCl is needed. Since KOH and HCl react in a 1:1 ratio, the number of moles of HCl required is also 0.04200 mol.

Volume of HCl = Moles of HCl / Molarity. Hence, the volume of 0.3850 M HCl required to neutralize 60.00 mL of 0.7000 M KOH = 0.04200 mol / 0.3850 M = 109.1 mL.

Therefore, 109.1 mL of 0.3850 M HCl is required to neutralize 60.00 mL of 0.7000 M KOH.

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When pressure is maintained constant, the volume of a particular mass of gas varies in person with the true temperature of the gas.  The volume of a specific quantity of a gas is inversely related to its pressure at constant temperature.

Each thing in three dimensions takes up some space. The volume of this area is what is being measured. The space filled within an object's borders in three dimensions is referred to as its volume. It is sometimes referred to as the object's capacity.

When pressure is maintained constant, the volume of a particular mass of gas varies in person with the true temperature of the gas.  The volume of a specific quantity of a gas is inversely related to its pressure at constant temperature.

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The technician needs to measure 2.6 mL of the concentrated hydrochloric acid solution and then add enough water to make a final volume of 250 mL to prepare a 0.125 M solution of hydrochloric acid.

To prepare a 0.125 M solution of hydrochloric acid (HCl) using a 12.0 M stock solution, the chemistry technician will need to dilute the concentrated solution. The dilution equation can be used to calculate the volume of the concentrated solution required:

C1V1 = C2V2

where C1 is the concentration of the concentrated solution, V1 is the volume of the concentrated solution, C2 is the desired concentration of the diluted solution (0.125 M), and V2 is the desired volume of the diluted solution (250 mL).

Substituting the given values into the equation, we get:
(12.0 M) V1 = (0.125 M) (250 mL)
Solving for V1, we get:
V1 = (0.125 M) (250 mL) / (12.0 M)
V1 = 2.60 mL (rounded to two decimal places)

Therefore, the chemistry technician will need to measure out 2.60 mL of the 12.0 M hydrochloric acid solution and add it to a volumetric flask. The flask should then be filled with distilled water up to the 250 mL mark, and the solution should be mixed well to ensure uniformity.

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Answer:

D) 14 Electrons

Explanation:

I took the test and got it right

The total number of electrons that can occupy the f sublevel is 14 electrons. Thus option D is correct.

Electrons can be defined as a negatively charged subatomic particle that together with protons and neutrons forms an atom's nucleus. It is the lightest subatomic particles.

s orbital has 2 electrons in pair

p orbital has 6 electrons in pair

d orbital has 10 electrons in pair

f orbital has 14 electrons in pair.

Thus, the total number of electrons that can occupy the f sublevel is 14 electrons. Thus option D is correct.

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Answer:

0.998 g/mL

Explanation:

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Answer:

Add or remove a proton

Explanation:

This is because if you add a neutron, Oxygen becomes an isotope. If you add or remove a valence electron, it becomes a positive or negatively charged ion. If you add or remove a proton, you take away its chemical identity. If you add a proton, Oxygen becomes Fluorine, take away a proton, it becomes Nitrogen

Answer:

Add or remove a proton

Explanation:

im just tryna help people out trust me its that one

The electrostatic potential energy between an electron and a proton that are separated by 53pm is 4.27 × 10^-18 J.

The electrostatic potential energy between two charged particles can be calculated using the

formula U = k*q1*q2/r,

where:

k is the Coulomb constant,

q1 and q2 are the charges of the two particles, and

r is the distance between them.

In this case, we have q1 = -1.60*10^-19 C (charge of the electron), q2 = 1.60*10^-19 C (charge of the proton), and r = 53 pm = 5.3*10^-10 m. Plugging these values into the formula, we get:

U = (8.99*10^9 N m2/C2)*(-1.60*10^-19 C)*(1.60*10^-19 C)/(5.3*10^-10 m)

U = 4.27 × 10^-18 J

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Answer:

S2H8

Explanation:

Although it might not occur possibly, we can write the formula for disulphur octahydride

We have two elements here, sulphur and hydrogen

The multiplicity of the sulphur is di while that of the hydrogen is octa

So the formula we are looking at here is S2H8

When an ester is hydrolyzed with water and sulfuric acid, the products formed are an alcohol and a carboxylic acid. This reaction is also known as saponification.

During the reaction, the ester bond is broken and the water molecule is split into a hydrogen ion (H+) and a hydroxide ion (OH-). The H+ ion reacts with the ester, causing it to break down into its alcohol and carboxylic acid components. The carboxylic acid is formed by the addition of the hydroxide ion to the carbonyl group of the ester. The alcohol is formed by the addition of the hydrogen ion to the oxygen atom of the ester. The resulting products are a carboxylic acid and an alcohol that are both hydrolyzed from the original ester.

1. Identify the ester you want to hydrolyze. An ester has the general structure RCOOR', where R and R' are alkyl or aryl groups.
2. In the hydrolysis reaction, water (H2O) is used as a reactant along with sulfuric acid (H2SO4) as a catalyst.
3. The ester (RCOOR') reacts with water (H2O) in the presence of sulfuric acid (H2SO4).
4. The hydrolyzed products formed are a carboxylic acid (RCOOH) and an alcohol (R'OH).

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When a good is in short supply, more people want it than there are available. Price is below the equilibrium price, which explains why.

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The weight of magnesium chloride required to prepare the 200 ml solution that is 5.0 M is approximately 48 grams.

To calculate the weight of magnesium chloride (\(MgCl_{2}\)) required to prepare a 200 ml solution that is 5.0 M, we need to use the formula: Weight (in grams) = Volume (in liters) × Concentration (in moles/liter) × Molecular Weight (in grams/mole)

First, we convert the volume from milliliters to liters by dividing it by 1000: Volume = 200 ml ÷ 1000 = 0.2 L. Next, we multiply the volume, concentration, and molecular weight: Weight = 0.2 L × 5.0 mol/L × 95.3 g/mol = 47.65 grams

Rounding to the nearest whole number, the weight of magnesium chloride required to prepare the 200 ml solution that is 5.0 M is approximately 48 grams.

This calculation ensures that the desired concentration is achieved by accurately measuring the appropriate amount of magnesium chloride, taking into account its molecular weight and the desired volume of the solution.

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Answer provides an overview of the components required for determining the reaction yield. It includes the initial masses of the reactants (CuCl + 2 H₂O and Al foil), the mass of the empty filter paper, and the combined mass of the filter paper and copper product obtained after the reaction.

The reaction yield can be calculated by subtracting the mass of the filter paper from the combined mass of the filter paper and copper. This calculation provides an estimate of the amount of copper produced in the reaction, representing the yield of the reaction.

REPORT - Determination of Reaction Yield

1. Mass of CuCl + 2 H₂O: ____ g

The initial mass of the reactant CuCl + 2 H₂O was measured before the reaction took place. This value represents the combined mass of the copper chloride and water.

2. Mass of Al foil used: ____ g

The mass of the aluminum (Al) foil used as the other reactant in the reaction was measured. This value indicates the amount of aluminum initially present in the reaction mixture.

3. Mass of empty filter paper: ____ g

The mass of the empty filter paper was determined before collecting the solid copper product. This measurement serves as a reference point for the subsequent mass calculation.

4. Mass of filter paper plus copper: ____ g

After the reaction, the copper product was collected on the filter paper. The combined mass of the filter paper and copper was measured. This value includes the mass of the filter paper and the mass of the copper product obtained from the reaction.

Using the measured values, the reaction yield can be calculated by subtracting the mass of the filter paper from the combined mass of the filter paper and copper. This calculation provides an estimate of the amount of copper produced in the reaction, representing the yield of the reaction.

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Answer:

C. Net force

Explanation:

The new pressure of the gas will be approximately 7602.88 atm.

To find the new pressure of the gas, we can use the combined gas law, which states that the ratio of the initial pressure, volume, and temperature of a gas to the final pressure, volume, and temperature of the gas is constant.

The combined gas law can be expressed as:

(P1 * V1) / (T1) = (P2 * V2) / (T2)

Where:

P1 and P2 are the initial and final pressures of the gas,

V1 and V2 are the initial and final volumes of the gas,

T1 and T2 are the initial and final temperatures of the gas.

Let's substitute the given values into the equation:

P1 = 686.2 torr

V1 = 4.4 L

T1 = 31.1°C + 273.15 (convert to Kelvin) = 304.25 K

V2 = 0.15 L

T2 = 599.8°C + 273.15 (convert to Kelvin) = 872.95 K

Now we can solve for P2:

(P1 * V1) / T1 = (P2 * V2) / T2

(686.2 torr * 4.4 L) / 304.25 K = (P2 * 0.15 L) / 872.95 K

Simplifying the equation:

3004.08 torr / 304.25 K = (P2 * 0.15 L) / 872.95 K

Cross-multiplying and solving for P2:

(P2 * 0.15 L) = (3004.08 torr * 872.95 K) / 304.25 K

P2 * 0.15 L = 867537.16 torr

P2 = 867537.16 torr / 0.15 L

P2 ≈ 5783581.07 torr

Converting torr to atm:

P2 ≈ 5783581.07 torr * (1 atm / 760 torr)

P2 ≈ 7602.88 atm

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