What is the change in internal energy (in J) of a system that releases 675 J of thermal energy to its surroundings and has 530 cal of work done on it?

A particular ore employed in this study needed a concentration of 100 g/L (200 lb/st solution or 600 lb/st ore) NaCN to extract gold at a rate of over 90 percent.

Since the 1970s, cyanide leaching, often known as "cyanidation," has been the main method used to extract gold. In this method, sodium cyanide is used to selectively dissolve gold from ore in a solution that contains between 100 and 500 parts per million, or 0.01% and 0.05% cyanide.

Certain bacteria, fungus, and algae can generate cyanides. Additionally, cyanides can be found in things like tapioca, spinach, bamboo shoots, almonds, lima beans, fruit pits, and car exhaust.

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Answer:

no water isn't wet.

Explanation:

Water isn't wet by itself, but it makes other materials wet when it sticks to the surface of them

When water at 0°C is heated, it actually decreases in volume until it reaches 4°C. Yes, that is correct.

This is because as water is heated, its molecules start to move faster and the space between them increases. However, at 4°C, water molecules become more densely packed due to the formation of hydrogen bonds, which causes an increase in volume. This continues until water reaches its maximum density at 4°C. As the temperature increases beyond 4°C, the volume of water begins to decrease again until it reaches 7°C, where it starts to expand again.
If water at 0°C is heated, it actually decreases in volume until it reaches 4°C. At temperatures between 5°C, 6°C, and 7°C, the volume of water will begin to increase again as it continues to be heated.

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Answer:  P2 = 0.858 atm

Explanation:

Use the combined gas law:  P1V1/T1 = P2V2/T2,

where the subscripts are the initial (1) and final (2) states.  Temperature must be in Kelvin.  We want P2, so rearrange the equation to solve for P2:

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

Note how I've arranged the volume and temperature values:  as ratios.  Now it is easy to cancel units and see what is going to happen to the pressure if we lower the temperature.  Since the pressure change is a function of (T2/T1), and we are lowering the temperature (T2), we'd expect this to decrease the pressure.

No information is given on volume, so we'll assume a convenient value of 1 liter.  Now enter the data:

P2 = (0.917atm)*(1)*(322K/344K)

P2 = 0.858 atm

Answer:

4.9 L O₂

General Formulas and Concepts:

Atomic Structure

Stoichiometry

Explanation:

Step 1: Define

Identify variables

[Given] 6.4 g O₂ at STP

[Solve] L O₂

Step 2: Identify Conversions

[STP] 1 mol = 22.4 L

[PT] Molar Mass of O: 16.00 g/mol

Molar Mass of O₂: 2(16.00) = 32.00 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

4.48 L O₂ ≈ 4.9 L O₂

Answer:

Copper

Explanation:

A person taking exogenous thyroid hormone would have increased thyroxine and decreased TRH (thyrotropin-releasing hormone) levels while taking this pill.

This is because the exogenous thyroid hormone provides additional thyroxine, leading to higher levels in the body. In response, the body's feedback mechanism detects the increased thyroxine levels and reduces the production of TRH to maintain hormonal balance.

When a person takes exogenous thyroid hormone (thyroxine), it means they are supplementing their body's natural thyroid hormone levels with an external source. In this scenario, if a person takes this pill, two specific changes are expected:

1. Increased thyroxine levels: Thyroxine is the primary hormone produced by the thyroid gland, and it plays a crucial role in regulating metabolism and other bodily functions. By taking exogenous thyroxine, the person's overall thyroxine levels increase in their body. This increase in thyroxine helps to compensate for any deficiency or imbalance in the body's natural thyroid hormone production.

2. Decreased TRH (thyrotropin-releasing hormone) levels: TRH is a hormone released by the hypothalamus, a region in the brain, and it stimulates the production and release of thyroid-stimulating hormone (TSH) from the pituitary gland. TSH, in turn, stimulates the thyroid gland to produce and release thyroxine. However, when a person takes exogenous thyroxine, the increased levels of thyroxine in the bloodstream provide negative feedback to the hypothalamus and pituitary gland. This negative feedback signals the hypothalamus to decrease the release of TRH, which subsequently leads to decreased levels of TRH in the body.

Overall, taking exogenous thyroid hormone results in increased thyroxine levels and decreased TRH levels due to the negative feedback loop involved in the regulation of thyroid hormone production and release. These changes aim to restore and maintain the balance of thyroid hormone levels in the body.

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The pH of the solution after the volune of base been added is 1.45

Calculation:-

15 mL of 0.200 M NaOH.

Moles of HBr = 0.200 x 0.020 = 0.004 moles.

Moles of NaOH = 0.200 X 0.015 = 0.003.

moles of HBr after titration = 0.004 - 0.003 = 0.001 moles.

The concentration of HBr after titration = 0.001/0.034 = 0.029M

PH -Log (0.029)

= 1.45

Titration is the slow addition of a solution of known concentration to a known volume of another solution of known concentration until the reaction reaches neutralization. Downtitration is characterized by reducing the dose over time once a specific response has been achieved to maintain a specific response while reducing the risk of side effects or to prevent withdrawal or discontinuation syndrome.

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Answer:

35.62%

Mass percent composition of K = 0.3562 x 100% Mass percent composition of K = 35.62%

Explanation:

Answer: 26C is 25.0 torr

Explanation: The decrease in vapor pressure is proportional to the molality of the solution, so the vapor pressure of the solution at 26°C is 25.0 torr.

First, we need to find the number of moles of glucose and water present in the solution:

n(glucose) = 16.0 g / 180.0 g/mol = 0.089 mol

n(water) = 80.0 g / 18.0 g/mol = 4.44 mol

Next, we'll find the mole fraction of water in the solution:

X_water = n(water) / (n(glucose) + n(water)) = 4.44 / (0.089 + 4.44) = 0.989

Finally, we can find the vapor pressure of the solution using Raoult's law:

P_solution = X_water * P_purewater = 0.989 * 25.21 torr = 25.0 torr

So the vapor pressure of the solution at 26°C is 25.0 torr.

706.1652 g is the molar mass of 4.68 mol of sodium bromate.

Given:

Sodium bromate is used in a mixture which dissolves gold from its ores.

Moles of sodium bromate= 4.68 mol

Molar mass of sodium bromate = 150.89 g/mol number of moles × mol

                                                       = 150.89 × 4.68

                                                       = 706.1652 g

Therefore, 706.1652 g is the molar mass of 4.68 mol of sodium bromate.

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Answer:

depends on the element it's reacting with..

Explanation:

if the another element requires less energy to loose electron then zinc will become negatively charged and hence becomes acidic radical..

normally if it is reacting with element with valency 4 and Atomic number less than it(Ti,Si,C) then it will lose electron and gain positive sign and henve becomes basic radical..

Answer:

vibrio vulnificus and vibrio

Explanation:

Answer:

vibrio vulnificus and vibrio parahaemolyticus

Answer:

The periodic table

The periodic table is a tabular array of the chemical elements organized by atomic number, from the element with the lowest atomic number, hydrogen, to the element with the highest atomic number, oganesson. The atomic number of an element is the number of protons in the nucleus of an atom of that element.

Explanation:

Answer:

About 28.9 kJ.

Explanation:

Recall the formula for specific heat:
\(\displaystyle q = mC\Delta T\)

Where q is the amount of heat released, m is the mass of the substance, C is its specific heat, and ΔT is the change in temperature.

Therefore, by substitution, we have that:
\(\displaystyle \begin{aligned} q & = (625\text{ g})\left(\frac{0.900 \text{ J}}{\text{g-$^\circ$C}}\right)\left(\frac{1 \text{ kJ}}{1000 \text{ J}}\right) \left(82.1^\circ\text{C}-30.7^\circ \text{C}\right) \\ \\ & = (625\text{ g})\left(\frac{0.900 \text{ J}}{\text{g-$^\circ$C}}\right)\left(\frac{1 \text{ kJ}}{1000 \text{ J}}\right)(51.4^\circ\text{C}) \\ \\ & = 28.9\text{ kJ}\end{aligned}\)

In conclusion, about 28.9 kJ of energy is needed.

The mass of mercury atoms in a 100-g sample of HgO is 92.6 g and the mass of oxygen atoms is 7.4 g.

In any 100-g sample of HgO, the mass of mercury atoms is 92.6 g and the mass of oxygen atoms is 7.4 g. This is because the composition of HgO is constant and does not change regardless of the size of the sample.

Therefore, the mass of mercury and the mass of oxygen in a 100-g sample of HgO will always be the same.

To find the mass of mercury atoms in a 100-g sample of HgO, simply multiply the mass of the sample by the percentage of mercury in the sample:

Mass of mercury = 100 g × 92.6% = 92.6 g

Similarly, to find the mass of oxygen atoms in a 100-g sample of HgO, multiply the mass of the sample by the percentage of oxygen in the sample:

Mass of oxygen = 100 g × 7.4% = 7.4 g

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The molecular ion peak indicates the molecular weight of the compound. In this case, the non-cyclic alkane has a molecular weight of 492. To determine the chemical formula, we need to know the number of carbon and hydrogen atoms in the molecule.

The formula for a non-cyclic alkane is CnH2n+2. The "+2" represents the two additional hydrogen atoms needed to satisfy the valency of carbon.
To find the number of carbon atoms in the molecule, we can divide the molecular weight by the atomic weight of carbon (12.01). 492/12.01 ≈ 41.
Therefore, the chemical formula for this non-cyclic alkane is C41H84.
n= 41 carbon atoms
y= 84 hydrogen atoms.

A non-cyclic alkane, molecular ion peak, and chemical formula.
If a non-cyclic alkane shows a molecular ion peak at m/z 492, you can determine the chemical formula using the general formula for alkanes, which is CnH(2n+2).
Step 1: Use the given molar mass (492) to create an equation.
12n + (2n+2)(1) = 492
Step 2: Simplify the equation.
12n + 2n + 2 = 492
Step 3: Combine like terms.
14n + 2 = 492
Step 4: Subtract 2 from both sides.
14n = 490
Step 5: Divide by 14 to find the number of carbon atoms (n).
n = 490 / 14
n = 35 carbon atoms
Step 6: Calculate the number of hydrogen atoms (y) using the alkane formula.
y = 2n + 2
y = 2(35) + 2
y = 70 + 2
y = 72 hydrogen atoms
So, the chemical formula for the non-cyclic alkane with a molecular ion peak at m/z 492 is CnHy, where n=35 carbon atoms and y=72 hydrogen atoms. Your answer: C35H72

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alignment of the Earth with the Moon and Sun

This is the answer.

Tides are formed by gravitational force of Sun and Moon.

3

Explanation:

moon is the reason that creates tides in the ocean due to gravitational force and the moon's distance

Nitric oxide and 21.6 grams of \(C_3H_6\)may combine to make roughly 21.62 grams of \(C_3H_3N\).

To determine the approximate mass of acrylonitrile (\(C_3H_3N\)) that can be produced from the given reactants, we first need to write and balance the chemical equation for the reaction. The reaction between \(C_3H_6\)(propene) and nitric oxide (NO) to produce acrylonitrile is as follows:

2 \(C_3H_6\)+ 2 NO -> 2 \(C_3H_3N\)+ 2 \(H_2O\)

From the balanced equation, we can see that the molar ratio between \(C_3H_6\)and \(C_3H_3N\)is 2:2, which simplifies to 1:1. This means that the molar mass of \(C_3H_6\)is equal to the molar mass of \(C_3H_3N\).

To calculate the molar mass of \(C_3H_6\), we sum the atomic masses of carbon (C) and hydrogen (H):

Molar mass of \(C_3H_6\)= (3 × atomic mass of C) + (6 × atomic mass of H)

Using the atomic masses from the periodic table:

Molar mass of \(C_3H_6\)= (3 × 12.01 g/mol) + (6 × 1.01 g/mol) = 42.09 g/mol

Since the molar mass of \(C_3H_6\) is equal to the molar mass of \(C_3H_3N\), the molar mass of \(C_3H_3N\)is also 42.09 g/mol.

Now, let's calculate the number of moles of \(C_3H_6\) and \(C_3H_3N\)using their respective masses:

Number of moles of \(C_3H_6\)= Mass of \(C_3H_6\) / Molar mass of \(C_3H_6\)

= 21.6 g / 42.09 g/mol

≈ 0.514 mol

Number of moles of \(C_3H_3N\)= Number of moles of \(C_3H_6\)(due to 1:1 molar ratio)

≈ 0.514 mol

Finally, to find the mass of \(C_3H_3N\), we multiply the number of moles by its molar mass:

Mass of \(C_3H_3N\)= Number of moles of \(C_3H_3N\)× Molar mass of \(C_3H_3N\)

≈ 0.514 mol × 42.09 g/mol

≈ 21.62 g

Therefore, Nitric oxide and 21.6 grams of \(C_3H_6\)may combine to make roughly 21.62 grams of \(C_3H_3N\).

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Answer:

Physical

Explanation:

Physical weathering is defined as the geological process in which rocks are broken down but there is no change in their chemical composition.

Granite tor are the rock masses above the ground surface which are  associated with granites

Granite Tor is an example of physical weathering as they formed by freeze–thaw weathering. Granite tor are formed when magma present in the crust cools down and form batholith. Rocks above batholith gets erodes and left the batholith to expose.

Hence, the correct answer is "Physical weathering'.

A loop of wire moving through a magnetic field will create which of the following?

(A) Electrical Current

I am pretty sure that electromagnetic Induction states that moving a magnet through a loop of wire creates . Electrical Current. I consider this option to be correct because according to lenz's law conductor  moves through loop and to be more exact in this case through an electrical current. I hope it help!

0.003 moles of \(CO_{2\) would be produced when 0.006 moles of Na2CO3 are used in the given reaction.

What is Moles?

Moles (mol) is a unit of measurement used in chemistry to express the amount of a substance. One mole of a substance is defined as the amount of that substance that contains the same number of entities (atoms, molecules, ions, or other particles) as there are atoms in 12 grams of pure carbon-12.

To solve this problem, you'll need to use the balanced chemical equation for the reaction between sodium carbonate (Na2CO3) and hydrochloric acid (HCl):

\(Na_{2\)\(CO_{3}\) + 2HCl → 2NaCl + \(H_{2\)+ \(CO_{2\)

From the equation, you can see that 1 mole of Na2\(CO_{3\) produces 1 mole of \(CO_{2\) So to find the number of moles of\(CO_{2\) produced when 0.006 moles of Na2\(CO_{3\) are used, you simply need to multiply 0.006 moles by the mole ratio of \(CO_{2\) to Na2\(CO_{3\), which is 1:1.

0.003 moles of \(CO_{2\) would be produced when 0.006 moles of Na2CO3 are used in the given reaction.

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The first step is to lessen the number of the organism which consumes clawcats. The second is to enhance the resources Clawncat requires to live.

Population is the total number of people living in a region (such as a nation or the planet), which is always changing due to births, immigration, and natural mortality.

There are two ways to boost the Clawcat population. The first step is to lessen the number of the organism which consumes clawcats. The second is to enhance the resources Clawncat requires to live, namely by expanding the plantation of Clawncat, providing enough irrigation, giving full access to sunshine, and increasing the richness of the soil through proper and effective fertilization.

Therefore, in the above given ways we can increase the population of Clawncat.

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Answer: C. Pb^2+(aq) + CO3^-2(aq) —> PbCO3(s)

Explanation:

The condition that must be met for conduction to occur is particles must be in contact. Therefore, the correct option is option C.

A pan heats up when you place it on the flame. It's because heat is transferred from the burner to the pan. Also, it allows any other utensil or pan to heat up. Yet after a while, the vessel cools down when you remove it from the heat. That happens because the vessel's heat is dissipated onto the surrounding area.

It enables the vessel to cool. Heat is passed from a warm object towards the cold object in both situations. Typically, it occurs in every situation. Conduction is the process through which heat is transported from one object's hot end to its cool end. The condition that must be met for conduction to occur is particles must be in contact.

Therefore, the correct option is option C.

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Answer:

Divide by the molar mass to get moles

Explanation:

Explanation:

Bottom line: Most asteroids are rocky bodies that lie within the asteroid belt while comets are dirty snowballs from the Oort Cloud, with some objects acting like a hybrid of these two types.

The option that is not a valid unit for reaction rate is g/s, which represents the amount of mass produced or consumed per unit time. Option D

The most common units for reaction rate are M/s, which represents the change in concentration per unit time, and mol/L, which represents the amount of reactant or product produced per unit volume. Of the options given, all except one are valid units for a reaction rate.

A reaction rate is a measure of how quickly reactants are converted to products in a chemical reaction. While this may be a valid unit for certain physical processes, it is not a valid unit for measuring the rate of a chemical reaction, which is typically expressed in terms of the change in concentration or amount of substance. Answer option D.

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