Given that the density of gold is 19.3 g cm-3, calculate the volume, V, of a gold nugget with a mass of 4.74 g.

The new volume of the balloon after heating it to a temperature of 51 °C is approximately 2.39 L.

Charles's law states that "the volume occupied by a definite quantity of gas is directly proportional to its absolute temperature.

It is expressed as;

\(\frac{V_1}{T_1} =\frac{V_2}{T_2}\)

Given that:

Substituting the given values and solve for V₂:

\(V_1T_2 = V_2T_1\\\\V_2 = \frac{V_1T_2}{T_1} \\\\V_2 = \frac{2.2\ *\ 324.15}{298.15 }\\ \\V_2 = 2.39 \ L\)

Therefore, the final volume is 2.39 litres.

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Answer:

We do something called hypothesis

Answer:

1. Make an observation.

2. Ask a question.

3. Propose a hypothesis.

4. Make predictions.

5. Test the predictions.

6. Iterate.

and if it can't be trsted the you did something wrong

Explanation:

The scientific method

At the core of biology and other sciences lies a problem-solving approach called the scientific method. The scientific method has five basic steps, plus one feedback step:

Make an observation.

Ask a question.

Form a hypothesis, or testable explanation.

Make a prediction based on the hypothesis.

Test the prediction.

Iterate: use the results to make new hypotheses or predictions.

The scientific method is used in all sciences—including chemistry, physics, geology, and psychology. The scientists in these fields ask different questions and perform different tests. However, they use the same core approach to find answers that are logical and supported by evidence.

Scientific method example: Failure to toast

Let's build some intuition for the scientific method by applying its steps to a practical problem from everyday life.

Answer:

(a) \(\Delta H=-73.1\frac{kJ}{mol}\)

(b) \(T_2=38.1\°C\)

(c) Yes, it is appropriated.

Explanation:

Hello.

(a) In this case, given the formation enthalpies for copper (II) sulfate, copper (II) ion and sulfate ion, we can compute the enthalpy change for such process as follows:

\(\Delta H=\Delta H_{Cu^{2+}}+\Delta H_{SO_4^{-2}}-\Delta H_{CuSO_4}\\\\\Delta H=64.8-909.3-(-771.4)\\\\\Delta H=-73.1\frac{kJ}{mol}\)

(b) In this case, since 13.0 g of copper (II) sulfate (molar mass: 159.55 g/mol) we can compute the gained heat by water via:

\(Q_{water}=-n_{CuSO_4}\Delta H=-13.0g*\frac{1mol}{159.55g}* -73.1\frac{kJ}{mol}\\ \\Q_{water}=5.96kJ=5960J\)

As the heat lost by the reaction is gained by the water, therefore, the final temperature is:

\(Q_{water}=m_{water}Cp_{water}(T_2-T_1)\\\\T_2=T_1+\frac{Q_{water}}{m_{water}Cp_{water}}\\ \\T_2=25.0\°C+\frac{5960J}{0.109L*\frac{1000g}{1L}*4.18\frac{J}{g\°C} } \\\\T_2=38.1\°C\)

(c) In this case, since this dissolution reaction is exothermic as it increases the temperature when undergone, we can infer that yes, this dissolution would be appropriate for the preparation of a hot pack, because a cold pack would be with an endothermic dissolution reaction.

Best regards.

Answer:

He proposed a model of the atom that consisted of a positively charged sphere with negatively charged electrons embedded in it. This model was later called the plum pudding model. Thomson’s discovery of the electron showed that atoms were not indivisible, as previously thought, but composed of smaller subatomic particles. His model also explained some phenomena such as cathode rays and electric currents. Thomson’s work helped advance our understanding of the structure and nature of the atom.

Explanation:

The volume of 12 gas forms when 21 L Cl2 react at STP is 21 L.

To determine the volume of 12 gas (I assume you mean I2 gas) formed when 21 L of Cl2 reacts at STP (standard temperature and pressure), we need to use the ideal gas law equation.

The ideal gas law equation is given by:

PV = nRT

Where:

P = pressure

V = volume

n = number of moles

R = ideal gas constant

T = temperature

At STP, the pressure is 1 atm, and the temperature is 273.15 K.

From the balanced equation, we can see that the molar ratio between Cl2 and I2 is 1:1. So, if 21 L of Cl2 reacts, it will produce an equal volume of I2 gas.

Given that the volume of Cl2 is 21 L, we can assume the volume of I2 gas formed will also be 21 L.

Therefore, the volume of I2 gas formed is 21 L.

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Answer:

the answer is A

Explanation:

Answer:

200g

Explanation:

n = CV

n = mass/molar mass

mass/molar mass = CV

mass/40 = 2 x 2.5

mass/40 = 5

mass = 5x 40

mass = 200g

Answer:

lungs

Explanation:

The volume of medication required for 75 gallons is 30 mL.

The correct procedure for determining the volume of a medication powder that is 1 gram / 100gallons of water required to treat a 75 gallon aquarium is the procedure which ensures that the answer expressed in the proper units.

The required concentration of the medication is 1 gram / 100gallons of water.

Volume of water to be be treated is 75 gallon.

1 g of the medication is dissolved in 40 mL of water.

Therefore, 40 mL of the medication contains 1 g of the medication powder.

40 mL of the medication will treat 100 gallons of water.

Volume of medication required for 75 gallons will be:

Volume of medication required for 75 gallons = 40 mL * 1 g/ 100 gallons * 75 gallons

Volume of medication required for 75 gallons = 30 mL

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Answer:

less

Explanation:

the more heat it has, the less a given heat will affect it

Answer:

more heat

Explanation:

Temperature is an nonliving limiting factor because it affects the amount of sea ice available for animals to live on statements is a reasonable conclusion about the Arctic ecosystem.

Option B is correct.

Further warming of the Arctic, the erosion of Arctic coastlines, and a disruption in global weather patterns will all result from the continued loss of Arctic sea ice. The Arctic's communities and ecosystems will be further disrupted as a result of the loss of sea ice.

Many of the current changes in the Arctic are being driven by rising temperatures that are three times faster than the global average annually. Most notably, ice and snow are melting at a faster rate. Both local ecosystems and the global climate system are affected by this.

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The total kilojoules in two tablespoons is  836.8 kJ.

To determine the total kilojoules in two tablespoons of a substance, we need to know the specific substance and its energy content per tablespoon. Different substances have different energy values, so without this information, it is not possible to provide an accurate calculation.

The energy content of food or substances is typically measured in kilocalories (kcal) or kilojoules (kJ). 1 kilocalorie is equal to 4.184 kilojoules. The energy content of a substance is often listed on food labels or in nutritional databases.

For example, if we have the energy content of a substance as 100 kilocalories (kcal) per tablespoon, we can convert it to kilojoules by multiplying it by 4.184:

100 kcal * 4.184 kJ/kcal = 418.4 kJ

So, if we have two tablespoons of this substance, the total energy would be:

418.4 kJ/tablespoon * 2 tablespoons = 836.8 kJ

It's important to note that the energy content of a substance can vary depending on its composition, density, and other factors. Therefore, it is always recommended to refer to reliable sources such as food labels, nutritional databases, or consult a qualified professional to obtain accurate information regarding the energy content of specific substances.

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1. The volume of the stock solution needed is 0.008 L

2. The concentration of the diluted solution is 0.52 M

1. How to determine the volume of the stock solution

We can obtain the volume of the stock solution as follow:

M₁V₁ = M₂V₂

7 × V₁ = 0.480 × 0.120

5 × V₁ = 0.0576

Divide both side by 7

V₁ = 0.0576 / 7

V₁ = 0.008 L

Thus, the volume needed is 0.008 L

2. How to determine the concentration of the diluted solution

We can obtain the concentration of the diluted solution as follow:

C₁V₁ = C₂V₂

7 × 20 = M₂ × 270

140 = M₂ × 270

Divide both side by 270

C₂ = 140 / 270

C₂ = 0.52 M

Thus, the concentration is 0.52 M

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Answer:

They need more oxhygen to fraction to incresse

Explanation:

Answer:

ether

Explanation:

Answer: O-H bonding present in water molecule is best described as polar and covalent.

Answer:

Maybe A

Explanation:

The pH of the aqueous solution is 8 means solution is basic.

pH of any solution will be calculated by using the below equation:

pH = -log[H⁺]

Given that concentration of H⁺ ions = 1.0×10⁻⁸ M

On putting this value in the above equation, we get

pH = -log( 1.0×10⁻⁸ )

pH = -(0-8) = 8

Means the given aqueous soution is basic in nature.

Hence pH is 8 means solution is basic.

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Answer: A volume of 455 mL from 0.550 M KBr solution can be made from 100.0 mL of 2.50 M KBr.

Explanation:

Given: \(V_{1}\) = ?,         \(M_{1}\) = 0.55 M

\(V_{2}\) = 100.0 mL,        \(M_{2}\) = 2.50 M

Formula used to calculate the volume of KBr is as follows.

\(M_{1}V_{1} = M_{2}V_{2}\)

Substitute the values into above formula as follows.

\(M_{1}V_{1} = M_{2}V_{2}\\0.55 M \times V_{1} = 2.50 M \times 100.0 mL\\V_{1} = 455 mL\)

Thus, we can conclude that a volume of 455 mL from 0.550 M KBr solution can be made from 100.0 mL of 2.50 M KBr.

Answer:

A. 455 mL

Explanation:

I took the Chemisty Exam

There are 0.2107 moles of KBr are dissolved in 60.2 mL of a 3.50 M solution.

The molarity of a substance is defined as the number of moles of solute present in 1 litre of a solution.

According to the given data, the molarity of the solution tells us that there are 3.50 moles of KBr in 1000mL of solution. But we only have 60.2mL of solution, so with a mathematical rule of three we can calculate the amount of moles in 60.2mL:

1000 ml - 3.50 moles

60.2 ml -x = 60.2 ml× 3.50 moles/1000 ml

x= 60.2 ml -0.2107 moles

So, there are 0.2107 moles of KBr.

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Answer:

1g/mL is the correct answer

Increasing the temperature increases the rate of reaction

The velocity of the particles present in a system simply intensifies with the rise in temperature.

This thermal energy increases their kinetic energy or intense motion, resulting in forceful, frequent collisions between reactant molecules that lead to an upsurge of triumphed ones and subsequently escalate the reaction rate.

Regarding option A, one should note that pressure is unrelated to temperature since they stand as independent variables throughout this reaction. Going for option B, flammability of the reactants isn't susceptible to alterations upon raising the temperature thus making it an unacceptable statement. Lastly, carbon dioxide does not possess heat-trapping properties rather its content solely contributes to diffusing into the overall surroundings.

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Answer:

The Answer will be provided below, please pay attention in class next time so that you don't have to be in a hurry like you are in now.

Explanation: The correct option is:

Both fossil fuels and wind energy can be used to produce electricity. However, burning fossil fuels does pollute the atmosphere, while using Earth's wind does not. Both fossil fuels and wind energy contribute to climate change, but the use of fossil fuels is much more damaging to the environment than the use of wind power.

Fossil fuels are non-renewable sources of energy that are formed over millions of years by the decomposition of organic matter. They release harmful greenhouse gases when burned, contributing to climate change. In contrast, wind energy is a renewable source of energy that uses turbines to harvest the power of wind. Wind energy does not produce any emissions, making it an environmentally friendly alternative to fossil fuels. While wind turbines can have some impacts on wildlife and habitats, the impact is much less severe than the effects of fossil fuel extraction and burning.

Added Part: Fossil fuels are non-renewable sources of energy that are derived from the remains of plants and animals that died millions of years ago. These sources include coal, oil, and natural gas. Wind energy, on the other hand, is a renewable source of energy that is generated by the kinetic energy of wind.

Here are some comparisons between fossil fuels and wind energy:

Environmental Impact: Fossil fuels have a significant negative impact on the environment. Burning fossil fuels produces greenhouse gases that contribute to climate change. The extraction of fossil fuels also has negative impacts on the air, water, and soil. Wind energy, however, has a very small environmental footprint. Wind turbines do not produce any emissions and do not require any water to generate electricity.

Energy Availability: Fossil fuels are abundant and have been the primary source of energy for decades. On the other hand, wind energy is a relatively new source of energy and the technology is still developing. However, the availability of wind energy is significant, as wind is a renewable source that is constantly available.

Sustainability: Fossil fuels are non-renewable, which means they will eventually run out. As the demand for energy continues to increase, the availability of fossil fuels will decrease. Wind energy is a renewable source of energy that will never run out.

Here are some pros and cons of both fossil fuels and wind energy:

Fossil Fuels:

Pros:

Reliable source of energy

High energy density

Large global infrastructure

Cons:

Non-renewable source of energy

Significant environmental impact

Price instability

Wind Energy:

Pros:

Renewable source of energy

Small environmental footprint

Low operating costs

Cons:

High initial costs for building wind turbines

Wind is an inconsistent source of energy

Can create noise pollution for surrounding communities

Answer:

erosion

Explanation:

erosion is the term that refers to the process by which land is worn away by natural forces or human activity.

Answer:

Erosion

Explanation:

Just took the test, hope it helps!

When the partial pressure of oxygen is 156 torr and the atmospheric pressure is 743 torr, the mole fraction of oxygen is 0.210.

Partial pressure is the pressure exerted by an individual gas in a mixture of gases. The partial pressure of a gas depends on its mole fraction.

The relationship between the partial pressure of a gas and the total pressure is given by Dalton's law, which states that the sum of the partial pressures is equal to the total pressure.

We can calculate the partial pressure of oxygen using the mathematical expression of Dalton's law:

pO₂ = P × X(O₂)

X(O₂) = pO₂ / P

X(O₂) = 156 torr / 743 torr = 0.210

where,

The mole fraction of oxygen is 0.210 when its partial pressure is 156 torr and the atmospheric pressure is 743 torr.

The complete question is:

The partial pressure of oxygen was observed To be 156 torr in air with a total atmospheric pressure of 743 torr. Calculate the mole fraction of oxygen present.

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0.0375 moles of BaSO₄ form during the reaction.

We can start by writing the balanced chemical equation for the reaction:

3 Ba(NO₃)₂(aq) + Al₂(SO₄)₃(aq) → 3 BaSO₄(s) + 2 Al(NO₃)₃(aq)

From the equation, we can see that 3 moles of BaSO₄are formed for every mole of Al₂(SO₄)₃ that reacts.

Since we know that 0.0125 mol of Al₂(SO₄)₃ reacts, we can use stoichiometry to calculate the number of moles of BaSO₄ that form:

0.0125 mol Al2(SO4)3 x (3 mol BaSO₄ / 1 mol Al₂(SO₄)₃ = 0.0375 mol BaSO₄

0.0375 moles of BaSO₄ form during the reaction.

Chemists can readily compare the amount of one substance to another in a chemical reaction by using moles as a unit of measurement. For instance, you can determine the number of moles of the product that will be produced if you know the number of moles of a reactant and the stoichiometry of the reaction.

The mass of the substance and its molar mass can be used to determine moles. The bulk of one mole of a substance is its molar mass, which is measured in grams per mole (g/mol).

A crucial unit of measurement in chemistry is the mole, which enables chemists to connect the amounts of various substances in chemical reactions with ease.

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The equilibrium constant relates the concentrations of the products and reactants in the chemical equilibrium. To calculate it we can apply the following equation.

For the reaction: aA + bB ---> cC + dD

Equlibrium constant (Ke) will be:

The letters in square brackets refer to the concentration raised to the respective coefficient. Now we replace the known values:

So, the equilibrium constant (Ke) will be 3.2M