What does it mean for an atom to be stable?

Answer:

A rigid tank holds a 2.91 moles of gas at a pressure of 772 kPa. What will the pressure be if another 1.09 moles of gas is added?

Explanation:

The flood mitigation techniques which the federal government might use for an imminent disaster are:

The federal government may construct flood control dams and levees because these structures can help to hold back floodwaters, reducing the risk of flooding downstream.

Additionally, the government can also undertake floodplain mapping and zoning as its involves identifying areas that are at risk of flooding and restricting development in those areas which can help to prevent people and property from being exposed to flood risks.

The government may also implement natural flood control measures, such as reforestation, to reduce the impact of floods.

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Answer:

48,840 Joules

Explanation:

The equation you should use for this problem is Q=m c ΔT

Now just substitute based of of what you know.

We do not know what Q is. M equals 1,000 grams. C equals .444 the specific heat capacity. Delta T equals 110.

*To find T you must subtract 130-20 degrees to find the change.

The final equation should be: Q= 1000×.444×110

Now all you do is solve like you would normally and the answer you should get is: 48,840.

And so that how the answer comes out :D

According to specific heat capacity, 48,840 joules of heat was gained by the pan.

Specific heat capacity is defined as the amount of energy required to raise the temperature of one gram of substance by one degree Celsius. It has units of calories or joules per gram per degree Celsius.

It varies with temperature and is different for each state of matter. Water in the liquid form has the highest specific heat capacity among all common substances .Specific heat capacity of a substance is infinite as it undergoes phase transition ,it is highest for gases and can rise if the gas is allowed to expand.

It is given by the formula ,

Q=mcΔT

Substituting values in above formula, Q= 1000×0.444×(130-20)=48,840 J.

Thus, 48,840 joules of heat was gained by the pan.

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Answer:

Synthesis

Explanation:

205.7 cm^3 (or 0.2057 L) of the concentrated tetraoxosulphate (VI) acid to prepare 8 dm^3 of a 0.5 mol/dm^3 solution of the compound.

To prepare 8 dm^3 of a 0.5 mol/dm^3 solution of tetraoxosulphate (VI) acid from a stock solution, you need to use:

(0.5 mol/dm^3) x (8 dm^3) x (98 g/mol) = 392 g of tetraoxosulphate (VI) acid

Since the acid is 97% pure, we know that:

(97/100) x (392 g) = 379.84 g of tetraoxosulphate (VI) acid is pure acid

We can use the specific gravity of the acid, which is 1.84 g/cm^3, to calculate the volume of the acid needed:

379.84 g / (1.84 g/cm^3) = 205.7 cm^3 of tetraoxosulphate (VI) acid

So, you would need to use 205.7 cm^3 (or 0.2057 L) of the concentrated tetraoxosulphate (VI) acid to prepare 8 dm^3 of a 0.5 mol/dm^3 solution of the compound.

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Answer:

i think option a is correct answer because when there is low temperature then the kinetic enegry will be very less and the atoms moves very slowly.

Answer:

A. very, very slowly

Explanation:

A is the answer because atoms will move faster in hot gas than in cold gas.

The reaction order and specific reaction rate constant can be determined by performing the kinetics experiment on irreversible polymerization A. Kinetic experiments can be used to investigate the rate and mechanism of chemical reactions. Chemical kinetics is the study of chemical reactions' speed and pathway.

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Answer:

The answer is "".

Explanation:

\(C_1=68.2 \ \frac{g}{L}\\\\V_2=1000.0 \ mL \\\\C_2=13.750 \ \frac{g}{L}\\\\V_1=?\)

Using formula:

\(V_1=\frac{V_2 C_2}{C_1}\\\\\)

     \(=\frac{1000 \ mL \times 13.750 \ \frac{g}{L}}{68.2 \ \frac{g}{L}}\\\\= 201.61 \ mL\)

Answer:

a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction

Answer:

The answer is : A

Answer:It is A

Explanation:

Because you a have a girl that knows everything

Answer:

I believe it is a physical change

Explanation:

The telltale sign of a chemical change is the formation of a new substance. They also usually involve the production of energy (heat, light, sound etc.)

Answer:

212° F

Explanation:

we would need 2625.13 grams (or 2.62513 kilograms) of NaCl.

To calculate the mass of NaCl required to produce a 26.4 mol/L solution with a 1.7 L volume, we need to use the formula that relates the mass of solute, moles of solute, and molarity:Molarity (M) = moles of solute / liters of solution Rearranging this formula, we get:moles of solute = Molarity (M) x liters of solutionWe can use this formula to find the moles of NaCl needed:moles of NaCl = 26.4 mol/L x 1.7 L = 44.88 molNow, we can use the molar mass of NaCl to convert from moles to grams. The molar mass of NaCl is 58.44 g/mol:mass of NaCl = moles of NaCl x molar mass of NaClmass of NaCl = 44.88 mol x 58.44 g/mol = 2625.13 gTo produce a 26.4 mol/L solution with a 1.7 L volume.

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This element is in group 1.

According to the octet rule, this element would be expected to form an ion with a charge of +1.

If X is in period 5, the ion formed has the same electron configuration as the noble gas Krypton

The symbol for the ion is Rb⁺

Electronic configuration refers to the arrangement of electrons in the orbitals of an atom or molecule, indicating the energy level of the electrons, the number of electrons in each energy level, and the number of electrons in each orbital.

Considering the given element:

It has one valence electron, hence it is in group 1. Group 1 elements form ions with a charge of +1.

Losing one electron will give the ion the same electron configuration as Kyrton since it is the noble gas in Period 4.

The element is rubidium and the ion is Rb⁺.

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This question is incomplete, the complete question is;

A sample of polystyrene, which has a specific heat capacity of 1.880 J.g⁻¹, is put into a calorimeter (see sketch at right) that contains 300.0 g of water. The polystyrene sample starts off at 94.9 °C and the temperature of the water starts off at 22.0. When the temperature of the water stops changing it's 27 °C . The pressure remains constant at 1 atm.

Calculate the mass of the polystyrene sample. Be sure your answer is rounded to 2 significant digits.

Answer:

the mass of the polystyrene sample is 57 g

Explanation:

Given the data in the question;

mass of water m\(_{water\)  = 300 g

Temperature of water T\(_{water\) = 22 °C

Specific heat capacity of water C\(_{water\) = 4.184 J/g°C

mass of the polystyrene sample m\(_{polystyrene\)  = ?

T\(_{polystyrene\) = 94.9 °C

Specific heat capacity of polystyrene; C\(_{polystyrene\) = 1.880 J.g⁻¹.°C⁻¹

T = 27.7 °C

Now, using heat conservation equation

heat lost by polystyrene = heat gained by water

m\(_{polystyrene\) × C\(_{polystyrene\) × ( T\(_{polystyrene\) - T ) = m\(_{water\) × C\(_{water\) × ( T - T\(_{water\) )

We substitute

m\(_{polystyrene\) × 1.880 × ( 94.9 - 27.7 ) = 300 × 4.184 × ( 27.7 - 22 )

m\(_{polystyrene\)  × 1.880 × 67.2 = 300 × 4.184 × 5.7

m\(_{polystyrene\)  × 126.336 = 7154.64

m\(_{polystyrene\) = 7154.64 / 126.336

m\(_{polystyrene\) = 56.63 ≈ 57 g   { 2 significant figures }

Therefore, the mass of the polystyrene sample is 57 g

Compounds are then formed when two or more than two elements combined together.

The compounds are formed when elements are joined and held together by strong forces called chemical bonds. A chemical bond is a force of attraction between atoms or ions that share or transfer valence electrons. Compounds forms as a result of chemical reaction. Compounds are substances composed of two or more elements chemically combined that can be separated into simpler substances only by chemical means.

So we can conclude that: Compounds are then formed when two or more than two elements combined together.

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Phosphorus triiodide is a nonpolar molecule.

We have to note that the polarity of a molecule would have a lot to do with the shape of the molecule. In other words, the arrangement of the atoms in the molecules tell us if the molecule would be polar or not.

The three iodine atoms are symmetrically positioned around the center phosphorus atom because the molecule has a trigonal pyramidal structure. As a result, the three P-I bonds' respective dipole moments cancel out and provide a net dipole moment of zero.

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the answer is 0.652 mol.

How to solve this problem?

To solve this problem, we need to use the ideal gas law, which relates the pressure, volume, temperature, and number of moles of a gas:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the absolute temperature.

First, we need to convert the temperature to Kelvin by adding 273.15 to the Celsius temperature:

T = 105 + 273.15 = 378.15 K

Next, we can rearrange the ideal gas law to solve for the number of moles:

n = PV/RT

Substituting the given values, we get:

n = (170.0 kPa)(3.35 L)/(8.31 J/mol K)(378.15 K)

n = 0.652 mol

Therefore, the answer is 0.652 mol.

In physics and chemistry, volume refers to the amount of three-dimensional space that a substance or object occupies. It is a physical quantity that is usually measured in units of cubic meters (m³) or its derived units such as liters (L) or milliliters (mL). The volume of a substance or object can be calculated by measuring its dimensions (length, width, and height) and applying the appropriate formula, such as V = l × w × h for a rectangular solid. In the case of a gas, the volume can be determined by measuring the container that holds the gas or by using other techniques such as the displacement method, where the volume of a gas is determined by measuring the volume of liquid that it displaces. The volume of a substance is an important parameter that affects its properties and behavior, such as its density, pressure, and temperature.

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Answer: The final temperature is \(38.0^0C\)

Explanation:

The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.

\(heat_{released}=heat_{absorbed}\)

\(Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})\)

\(-[m_1\times c_1\times (T_{final}-T_1)]=[m_2\times c_2\times (T_{final}-T_2)]\)

\(-[m_1\times (T_{final}-T_1)]=[m_2\times (T_{final}-T_2)]\)   (as \(c_1=c_2\))

Q = heat absorbed or released

\(m_1\) = mass of water at \(85.0^0C\) = \(volume\times density=41.0ml\times 1g/ml=41.0g\)

\(m_2\) = mass of water at \(26.0^0C\) = \(volume\times density=161.0ml\times 1g/ml=161.0g\)

\(T_{final}\)  = final temperature = ?

\(T_1\)   = temperature of 41.0 ml of water = \(85.0^0C\)

\(T_2\)   = temperature of 161.0 ml of water = \(26.0^0C\)

Now put all the given values, we get

\(-[41.0\times (T_f-85.0)^0C]=161.0\times (T_f-26.0)^0C\)

\(T_f=38.0^0C\)

Thus the final temperature is \(38.0^0C\)

1

1

The general molecular formula for phenol is C6H5OH. It is an aromatic organic compound with a hydroxyl group bonded to a carbon atom of a cyclic structure. The ring structure has alternate double and single bonds. The formula of phenol is C6H5OH. Benzene has the formula C6H6. It is a hexagonal ring of six carbon atoms bonded with alternate single and double bonds. Each carbon atom in benzene has a bond with a hydrogen atom. In phenol, a hydroxyl group replaces one of the hydrogen atoms.

The reaction of CuCl2, HNO3, and AgNO3 is a redox reaction. In a redox reaction, one substance loses electrons and is oxidized, while another substance gains electrons and is reduced. In this reaction, CuCl2 is oxidized to Cu2+, HNO3 is reduced to NO, and AgNO3 is reduced to Ag.

The balanced equation for the reaction is:

CuCl2 + 2HNO3 + 2AgNO3 → Cu2+ + 2NO + 2AgCl

The products of the reaction are copper(II) ions, nitrogen monoxide gas, and silver chloride precipitate.

Here are some of the properties of phenol:

Phenol is a white crystalline solid that is soluble in water.

Phenol has a strong, characteristic odor.

Phenol is a mild acid.

Phenol is toxic and can cause burns to the skin and eyes.

Phenol is used in a variety of products, including disinfectants, antiseptics, and plastics.

Answer:

what happened to it, have the gone extinct

The beach at Antibes, France, is made mostly of small, smooth rocks that have been worn down by being pushed against one another by the energy of the sea water.

The geological process of erosion occurs when earthen materials are pushed and worn away by natural forces such as wind or water. Although it does not necessitate movement, a similar process known as weathering dissolves or disintegrates rock.

Weathering occurs when rocks and minerals on the Earth's surface disintegrate or dissolve. Weathering is caused by a variety of factors such as water, ice, acids, salts, plants, animals, and temperature swings. After a rock has been broken down, a process known as erosion transports the shards of rock and mineral away. The Earth's rocks are all too soft to endure weathering and erosion.

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Answer:

○\(No. Of Moles = \frac{mass of the substance}{atomic mass of the substance} \\\)

No of moles = 93 g ÷ 138 amu

No of moles = 0.67 moles

93 grams of potassium carbonate contain 0.67 moles.

There are 0.67 moles present in 93 grams of potassium carbonate (K2CO3). Details about no of moles can be found below.

The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass.

According to this question, there are 93 grams of potassium carbonate.

Molar mass of K2CO3 = 138.205 g/mol

No of moles = 93g ÷ 138.205g/mol = 0.673mol

Therefore, there are 0.67 moles present in 93 grams of potassium carbonate (K2CO3).

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At 25°C, combine 47.0 mL of ethylene glycol (d = 1.11 g/mL; molar mass = 62.07 g/mol) with 50.0 mL of water (d = 1.00 g/mL) to create an antifreeze solution. The antifreeze solution's molarity is 0.0086 M if its density is 1.07 g/mL.

Antifreeze is an additive that reduces a water-based liquid's freezing point. To achieve freezing-point depression for cold conditions, an antifreeze combination is utilized. Common antifreezes also raise the liquid's boiling point, enabling a rise in coolant temperature. However, every typical antifreeze addition also has a lower heat capacity than water, which makes it less effective as a coolant when combined with water.

The combination of a solution's freezing and boiling temperatures depends on the amount of dissolved components present. Therefore, salts cause aqueous solutions' melting points to decrease. Although salts are widely used for de-icing, salt solutions should not be utilized in cooling systems as they cause metal corrosion. Because they typically have melting values that are lower than those of water, low molecular weight organic substances can be used as antifreeze. Alcoholic organic compound solutions, in particular, are useful. Since antifreezes were first made commercially available in the 1920s, they have all been composed primarily of alcohols such methanol, ethanol, ethylene glycol, and others.

Molarity = \(\frac{mole}{volume}\)

To calculate the moles of ethylene glycol.

The mass of ethylene glycol is 47.0 mL × 1.11 g/mL = 52.17 g.

Since molar mass of ethylene glycol is 62.07 g/mol, the moles of ethylene glycol is:

\(\frac{52.17}{62.07}\) = 0.84 mol

To calculate the total volume of the antifreeze solution. We know that the volumes of ethylene glycol and H₂O are 47.0 mL and 50.0 mL, respectively.

Therefore, the total volume of the antifreeze solution is 47.0 mL + 50.0 mL = 97.0 mL.

Finally, the molarity of the antifreeze solution can be calculated using the formula

Molarity = \(\frac{mole}{volume}\)

Therefore, the molarity of the antifreeze solution is:

\(\frac{0.84}{97.0}\) = 0.0086 M

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The lattice energy of the compound is -5745 kJ/mol.

We know that the lattice energy is the energy that is  given out when a crystal lattice is formed. We obtain the energy by the use of the Hess law which would have to involve the heat that was evolved or absorbed in the process.

Lattice energy = (−989) - (129) - (153) - [(647 + 1627 + 2569)] - (−369)

Lattice energy = -5745 kJ/mol

Hence the lattice energy of the unknown compound MX3  given the data that has been provided is obtained as -5745 kJ/mol.

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Answer:

1

Explanation:

To determine the value of K (equilibrium constant) at 25 °C, we can use the Nernst equation, which relates the cell potential (E) to the equilibrium constant (K) and the standard cell potential (EºCell). The Nernst equation is given by:

E = EºCell - (RT / nF) * ln(K)

Where:

E = cell potential

EºCell = standard cell potential

R = gas constant (8.314 J/(mol·K))

T = temperature in Kelvin (25 °C = 298 K)

n = number of electrons transferred in the balanced redox equation

F = Faraday's constant (96,485 C/mol)

ln = natural logarithm

In this case, the given standard cell potential (EºCell) is -0.37 V.

The balanced redox equation for the cell reaction is:

Pt + Cr²+ -> Pt + Cr³+

Since there is no change in the oxidation state of Pt, no electrons are transferred in the reaction (n = 0).

Substituting the known values into the Nernst equation, we have:

E = -0.37 V - (8.314 J/(mol·K) * 298 K / (0 * 96,485 C/mol)) * ln(K)

E = -0.37 V

Since n = 0, the term (RT / nF) * ln(K) becomes 0, and we are left with:

-0.37 V = -0.37 V - 0

This implies that the value of K is 1, since any number raised to the power of 0 is equal to 1.

Therefore, the value of K at 25 °C for the given cell is 1.

Answer:

Br-CH2-CH(CH3)2-C(Cl)H-CH(CH3)2-CHO

Explanation:

The molecule has a total of 14 carbon atoms, 13 hydrogen atoms, and 1 bromine atom. The carbon atoms are arranged in a chain with a methyl group attached to the second carbon atom, a chlorine atom attached to the third carbon atom, and two methyl groups attached to the fourth carbon atom. The fifth carbon atom has a carbonyl group attached to it.

The molecule is an aldehyde, which means that it has a carbonyl group (C=O) at the end of the chain. The carbonyl group is polar, and the oxygen atom has a partial negative charge. The hydrogen atom has a partial positive charge. This polarity makes the aldehyde group susceptible to nucleophilic attack.

The bromine and chlorine atoms are both electrophilic, which means that they have a partial positive charge. This makes them susceptible to nucleophilic attack.

The methyl groups are non-polar and do not have any significant reactivity.

The molecule is a chiral molecule, which means that it has a mirror image that is not superimposable on itself. This is because the carbon atom with the carbonyl group is attached to four different groups.

The molecule is a liquid at room temperature and has a strong odor. It is used in a variety of products, including perfumes, flavorings, and plastics.

To answer this question, we need to convert grams to moles and then use the Avogadro's number to convert moles to molecules.

The molar mass of Mg(OH)2 is 58.32 g/mol.

First, we need to find the number of moles of Mg(OH)2 in 75.0 g.

75.0 g / 58.32 g/mol = 1.287 mol

Next, we need to convert moles to molecules.

1.287 mol x 6.022 x 10^23 molecules/mol = 7.75 x 10^23 molecules

Finally, we can use the molecular formula of Mg(OH)2 to calculate the number of miles of Mg(OH)2.

1 molecule of Mg(OH)2 contains 3 atoms of oxygen (O) and 2 atoms of hydrogen (H).

So, the total number of miles of Mg(OH)2 is:

7.75 x 10^23 molecules x 2 miles/molecule = 1.55 x 10^24 miles

Therefore, there are 1.55 x 10^24 miles of magnesium hydroxide in 75.0 g of magnesium hydroxide.

Answer:

\(T_F=1029\ºC\)

Explanation:

¡Hola!

En este caso, dada la información, es posible determinar que la temperatura del sistema estará entre 560 °C y 1100 °C, por lo tanto, se hará necesario establecer la suma de la energía del cobre y del estaño como cero:

\(Q_{Cu}+Q_{Sn}=0\)

Así, podremos escribir esta ecuación en términos de masas, calores específicos y temperaturas como sigue:

\(m_{Cu}C_{Cu}(T_F-T_{Cu})+m_{Sn}C_{Sn}(T_F-T_{Sn})=0\)

Con el fin de resolver para la temperature final:

\(T_F=\frac{m_{Cu}C_{Cu}T_{Cu}+m_{Sn}C_{Sn}T_{Sn}}{m_{Cu}C_{Cu}+m_{Sn}C_{Sn}}\)

Así, reemplazamos las variables conocidas como se muestra a continuación:

\(T_F=\frac{150g*0.093cal/g\ºC*1100\°C+35g*0.060cal/g\ºC*560\°C}{150g*0.093cal/g\ºC+35g*0.060cal/g\ºC}\\\\T_F=1029\ºC\)

¡Saludos!