How much heat (in Joules) is needed to raise the temperature of 257g of ethanol (cethanol=2.4 J/g°C) by 49.1°C?

Answer:

The correct answer is indeed A

Explanation:

Answer:

its manganese

Explanation:

Manganese is in the middle of the period has the highest number of oxidation states because all other elements have at least two different oxidation states

Answer: hey its me btw the answer is The number of electrons the element needs to lose or gain to have a full valence shell

Explanation:

Answer:380.580722 g/mol

Explanation:

380.580722 g/molCopper(II) phosphateNamesChemical formulaCu3(PO4)2Molar mass380.580722 g/mol (anhydrous) 434.63 g/mol (trihydrate)Appearancelight bluish-green powder (anhydrous) blue or olive crystals (trihydrate)Solubility in waterslightly soluble

The molar mass of Cu₃(PO₄)₂ is calculated by summing the contributions of copper, phosphorus, and oxygen, resulting in a total of 380.59 g/mole.

To calculate the molar mass of Cu₃(PO₄)₂, follow these steps:

Identify the atomic masses for each element:

Cu = 63.55 g/mole,

P = 30.97 g/mole,

O = 16.00 g/mole.

Calculate the contribution of each element in the compound:

Add the contributions to find the total molar mass:

Molar mass of Cu₃(PO₄)₂ = 190.65 g/mole + 61.94 g/mole + 128.00 g/mole

= 380.59 g/mole.

Therefore, the molar mass of Cu₃(PO₄)₂ is 380.59 g/mole.

Answer:

Hydro power

Advantage- Clean source

Safe

Disadvantage- Expensive

Environmental consequences

Coal

Advantage- Easy to find

Affordable

Disadvantage- Non renewable

Pollution

Explanation:

I helped you out with two of them

Answer:a

Explanation:

The difference between charging by conduction and charging by induction is

A. During induction, charges move between objects that briefly touch; during conduction, charges move between objects that are rubbed together.

Conduction charges another body with a charged body by came in contact with that body.

Induction charges another body without came in contact with that body.

Thus, the correct option is A

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Answer:

B

Explanation:

The two little guys.

I just took this question in USATESTPREP and B was the correct choice.

Trust me

IMPORTANT --> I love you and you deserve the world <3

According to the law of conservation of matter, the reactants in order to complete the product side of the reaction is B . Thus option B is correct.

Law of conservation of matter stated that the total mass of the products must equal the total mass of the reactants in chemical processes.

It also stated that the amount of matter in any given system that is closed to the transfer of matter (in and out) remains constant.

There are basically four laws of conservation.

Reactants are defined as a material that enters and is changed during a chemical reaction.

Products are defined as a material found at the end of a chemical reaction.

Thus, according to the law of conservation of matter, the reactants in order to complete the product side of the reaction is B . Thus option B is correct.

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Answer:

P = 24.34 atm

Explanation:

V = 5.0L

P = ?

n = 4.75 moles

T = 39.3°C = (39.3 + 273.15)K = 312.45K

From ideal gas equation,

PV = nRT

P = pressure of the gas

V = volume of the gas

n = no. Of moles present

R = ideal gas constant = 0.082atm.L / mol.K

PV = nRT

P = nRT / V

P = (4.75 * 0.082 * 312.45) / 5

P = 121.699 / 5

P = 24.339 atm

P = 24.34 atm

The pressure of the gas is 24.34 atm

Final answer:

The pressure in a 5.00 L tank with 4.75 moles of oxygen at 39.3 °C is calculated using the ideal gas law, resulting in approximately 24.65 atm.

Explanation:

To calculate the pressure of a gas in a tank, we can use the ideal gas law which is PV=nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

First, convert the temperature from degrees Celsius to Kelvin by adding 273.15 to the Celsius temperature:

T = 39.3 °C + 273.15 = 312.45 K

Next, use the ideal gas law to calculate the pressure:

P =[tex]\frac{nRT}{V}[/tex]

Given n = 4.75 moles, T = 312.45 K, V = 5.00 L, and R = 0.0821 atm·L/mol·K (value of the ideal gas constant when pressure is measured in atmospheres), we can calculate the pressure:

P = [tex]\frac{(4.75 moles)(0.0821 atm·L/mol·K)(312.45 K)}{5.00 L}[/tex]

Doing the calculation:

P =[tex]\frac{(4.75)(0.0821)(312.45)}{5.00}[/tex] = 24.65 atm

This means the pressure inside the 5.00 L tank containing 4.75 moles of oxygen at 39.3 °C is approximately 24.65 atmospheres.

Answer:

Q = 75.312 KJ

Explanation:

Heat is the amount of the thermal energy contained in an object measured in joules.  When heat energy is transferred to an object, the temperature of the object changes depending on the amount of heat applied and the type of object.

Given that:

mass of water (m) = 225 g, Temperature difference ([tex]\Delta T[/tex]) = 100°C - 20°C = 80°C, Water’s specific heat capacity ([tex]c_p[/tex]) = 4.184 J/g°C

The quantity of heat (Q) is given as:

[tex]Q=mc_p\Delta T[/tex]

[tex]Q= 225g *4.184J/g^0C*80=75312J=75.312KJ[/tex]

The amount of heat in joules required to raise the temperature of 225 g of water from 20.0 °C to 100 °C is calculated using the heat equation q=mcΔT. After substituting appropriate values, we get the result as 75.3 kJ.

To calculate the amount of heat required to raise the temperature of 225 g of water from 20.0 °C to 100 °C, we can use the heat equation q = mcΔT where 'm' is the mass of the water, 'c' is the specific heat capacity of water, and 'ΔT' is the change in temperature.

Here, m = 225 g (the mass of the water), c = 4.184 J/g °C (the specific heat capacity of water), and ΔT = 100 °C - 20 °C = 80 °C (the change in temperature).

Hence, q = mcΔT = (225 g) × (4.184 J/g °C) × (80 °C) = 75312 J or 75.3 kJ after rounding to 3 significant figures. Hence, the amount of heat in joules required to raise the temperature of 225 g of water from 20.0 °C to 100 °C is 75.3 kJ.

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Answer:

destroyed, from, endothermic

Explanation:

Energy is conserved in chemical reactions. It is neither created nor destroyed but can be transferred from one form to another.

An exothermic reaction transfers energy from the reacting substance to the surroundings. The body of the container feels warm. An exothermic reaction has a negative value of enthalpy.

An endothermic reaction transfers energy from the surroundings to the reacting substance. The body of the container feels cold. In an endothermic reaction, enthalpy is positive.

Answer:

1. False 2. True

Explanation:

1. Nitrogen forms the rungs

Ok so First of all we start with the fire. The fire gives off radiation because you can feel the heat through space. The fire also gives of conduction because you put the hotdog on the fire to cook it, and the hotdog will give off steam when it is hot causing it to give of Convection.

There is how cooking a hotdog over a fire uses all three heat transfer

Roasting a hot dog over a fire involves all three types of heat transfer: conduction, convection, and radiation. Conduction transfers heat through the stick to the hot dog, convection happens when heat is carried to the hot dog by hot gases rising from the fire, and radiation is heat traveling through the air from the fire to the hot dog.

When you are roasting a hot dog over a fire, all three types of heat transfer - conduction, convection, and radiation - are involved.

Conduction is when heat energy is directly transferred through a substance, in this case from the hot dog stick to the hot dog itself. Heat from the fire causes the molecules in the stick to vibrate more, which in turn cause the molecules at the lower end of the stick where the hot dog is placed to vibrate, and this transfers heat to the hot dog.

Convection occurs when heat is transferred through a fluid (which could be gases or liquids). Here, the hot gases rising from the fire reach the hot dog, heating it.

Lastly, radiation is heat transfer that doesn't require a medium to move through. Essentially, it's heat transfer simply through the air. In the hot dog scenario, it's the heat from the fire radiating outwards in all directions, some of it reaching the hot dog and cooking it.

So, in essence, roasting a hot dog over a fire is a great way to understand heat transfer!

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Answer:

V = 3.89 L

Explanation:

Given data:

Mass of oxygen  = 5.024 g

Temperature = 28°C (28+273 = 301 k)

Pressure = 0.988 atm

Volume occupy by oxygen = ?

Solution:

PV = nRT

We will calculate the number of moles;

Number of moles = mass/ molar mass

Number of moles = 5.024 g/ 32 g/mol

Number of moles = 0.157 mol

Now we will calculate the volume,

PV = nRT

V = nRT/P

V = 0.157 mol × 0,.0821 atm.L /mol.K × 301 K / 0.998 atm

V = 3.88 L / 0.998

V = 3.89 L

The statement of kb is "[C5H5NH+][OH-]/[C5H5N]"

The base dissociation constant is defined as Kb. In water, the base dissociation constant is a measurement of how efficiently a base dissociates into its component ions.

The hydroxide ion is formed when weak bases react with water, as stated in the general equation below, where B is the parent base and BH+ is its conjugate acid:

B(aq) + H2O(l) ⇌ BH+ (aq) + OH−(aq)

The base dissociation constant (Kb), also known as the base ionisation constant, is the equilibrium constant for this reaction:

Kb = [BH+][OH−]/[B]

From the given equation, base dissociation constant comes out to be,

Kb = [C5H5NH+][OH-]/[C5H5N]

Hence the correct answer is Kb = [C5H5NH+][OH-]/[C5H5N]

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The percentage of water in the hydrated lithium nitrate is calculated by subtracting the mass of the dehydrated compound from the initial mass of the hydrated compound. The result is the mass of water, which is then divided by the initial mass of the hydrated compound and multiplied by 100 to give the percentage of water.

A chemist started with a hydrated lithium nitrate which weighed 170 grams. After heating it and driving off the water of hydration, the mass of the sample reduced to 95.3 grams. This mass reduction is due to the loss of water molecules.

The chemist found that the mass of water lost is 170 grams − 95.3 grams = 74.7 grams. Therefore, the percentage of water in the hydrate can be calculated by dividing the mass of the water lost by the initial mass of the hydrate and then multiplying by 100%.

Using this method, the percentage of water in the hydrated lithium nitrate can be calculated as: (74.7 grams/170 grams)*100% = 43.94%. Therefore, approximately 44% of the mass of the hydrated lithium nitrate is water.

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Answer:

CuSO4 + 2NaOH → Cu(OH)2 + Na2SO4

Explanation:

The reaction between CuSO4 and NaOH leads to the formation of Cu(OH)2 as the insoluble precipitate and Na2SO4 in solution.

The reaction between CuSO4 and NaOH in an aqueous solution leads to the formation of copper (II) hydroxide, Cu(OH)2, and sodium sulfate, Na2SO4. However, the student's example and information provided seem to have mixed details regarding a different reaction involving carbonates. When CuSO4 reacts with NaOH, the insoluble precipitate formed is Cu(OH)2, a blue substance. This can be balanced and represented as CuSO4(aq) + 2NaOH(aq) → Cu(OH)2(s) + Na2SO4(aq). Here, sodium sulfate remains dissolved in the aqueous solution, functioning as spectator ions, and does not participate actively in the formation of the precipitate.

The precipitate for CuSO4 + NaOH reaction is Cu(OH)2. When copper sulfate reacts with sodium hydroxide, a double displacement reaction occurs where the insoluble copper hydroxide precipitates out. The balanced chemical equation would be: CuSO4 + 2NaOH → Cu(OH)2 + Na2SO4

Answer:

color

Explanation:

Scientists can use the color of minerals to tell them apart.

Malaria  is transmitted indirectly through a vector.Another word for communicable diseases is infectious.Botulism is a bacteria caused illness found in raw eggs. It causes diarrhea symptoms. The transmission of this disease would best be described as oral -fecal.

Communicable diseases are defined as diseases or  illnesses which spread from one person to another or from an animal to a person, or from a surface or a food. Diseases can  also be transmitted during air travel through:

1) direct contact with a sick person

2) respiratory droplet spread from a sick person  while sneezing or coughing

3) contact with blood or other body fluids

4)  inhalation of viruses or bacteria present in the air

5)contact with a contaminated surface or object

6) bites from insects or animals that can transmit the disease

7) ingestion of contaminated food or water

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Answer:

105.9888 g/mol

Explanation:

The molar mass of sodium carbonate is 105.9888 g/mol (grams per mole)

Answer:

Rising action- A character struggles with a decision.

falling action- The consequences of the choice become clearer.

Climax- A character makes a decision.

Resolution- A character understands the moral.

Exposition- A major conflict is introduced.

Explanation:

no one else gave the right answer so I found out myself, but hey! always that one person right! Good luck!

Answer:

your welcome

Explanation:

Answer:

A.Water moves in a continuous cycle from the surface of the Earth, through the crust, oceans, and atmosphere.

Thank You.

Answer:

second

convection current

first

lithosphere

Explanation:

xoxo

Demi

Answer:

Explanation:

Copper is a single element, not made up of anything but copper.

Salt is an element, as it is made up of multiple things, such as chlorine and sodium, but are combined per molecule. Jelly beans are made up of multiple elements, but are a mixture as they are not all the same. there isn't a single "jelly bean" molecule that is uniform throughout them.

Answer:

ΔH₁₂ = -867.2 Kj

Explanation:

Find enthalpy for 3H₂ + O₃ => 3H₂O given ...

2H₂ + O₂ => 2H₂O      ΔH₁ = -483.6 Kj

        3O₂ => 2O₃        ΔH₂ = + 284.6 Kj

_____________________________

3(2H₂ + O₂ => 2H₂O) => 6H₂ + 3O₂ => 6H₂O       (multiply by 3 to cancel O₂)

6H₂ + 3O₂ => 6H₂O        ΔH₁ = 3(-483.6 Kj) = -1450.6Kj

          2O₃ => 3O₂           ΔH₂ = -284.6Kj              (reverse rxn to cancel O₂)

_______________________________

6H₂ + 2O₃ => 6H₂O         ΔH₁₂ = -1735.2 Kj       (Net Reaction - not reduced)

________________________________

divide by 2 => target equation (Net Reaction - reduced)

3H₂ + O₃ => 3H₂O            ΔH₁₂ = (-1735.2/2) Kj = -867.2 Kj    

Answer:

-1300

Explanation:

These models are similar because "both the nuclear model and the solar system model have concept of nucleus, electron, positively charged nucleus at center and electrons orbiting around the nucleus".

Explanation:

The points which showcase similarities among both the atomic structure and the composition of the solar system are like the large percentage of the mass centered in the core which is the nucleus or the sun. Attractive forces bring the structure together by application of electromagnetic force or gravitational force.

The existence of the external objects influences the stable state of other surrounding objects as suggested by Pauli theory of exclusion and gravitational disturbance. Overall on the basis of the view only, in both the model their is similarity like atomic model speaks about electrons orbiting the nucleus similar to planets orbiting the sun.

Answer:

Alkanes with more than 3 carbons can show constitutional isomerism. They can be either linear or branched structures. This is categorized as chain isomerism. Butane is the smallest alkane to show such isomerism with 2 isomers.Alkanes with more than 3 carbons can show constitutional isomerism. They can be either linear or branched structures. This is categorized as chain isomerism. Butane is the smallest alkane to show such isomerism with 2 isomers.

Explanation:

Final answer:

Alkanes exhibit structural isomerism, including branched-chain isomerism, where the same molecular formula has different structural arrangements. Alkenes can show structural as well as geometric isomerism due to the rigidity of the double bond.

Explanation:

Isomerism in Alkanes

The type of isomerism shown by alkanes is called structural isomerism, specifically branched-chain isomerism. This occurs when alkanes with the same molecular formula have different arrangements of carbon atoms. For example, butane (C4H10) can exist as a straight-chain alkane or it can have a branched-chain structure, resulting in isomers with different physical properties.

Branched-chain alkanes and straight-chain alkanes are isomers because they have the same molecular formula but different structural formulas, leading to different physical properties. In contrast, alkenes can exhibit structural isomerism as well as geometric isomerism, also known as cis-trans isomerism, which occurs due to restricted rotation around the double bond.

While alkanes only show structural isomerism such as straight-chain and branched-chain structures, alkenes can show both structural and geometric isomerism, where the spatial orientation of groups attached to the double bond leads to distinct isomers. This rigidity of the double bond in alkenes influences their chemical reactivity and physical properties.

Answer:

Write 2 behind the NaCl so it becomes 2NaCl and 2 behind the NaF so it becomes 2NaF. The others take 1 each

Explanation:

The coefficients of the given balanced chemical equation are 2, 1, 2, 1.

A chemical equation can be defined as the representation of a reaction in terms of symbols of the reactants and products. A chemical equation has of reactants contributing to the reaction, formed products.

The equation which contains the number of atoms of substances that is equal on either side of the equation is known as a balanced chemical equation.

The law of conservation of mass has to be followed by a balanced chemical equation. By obeying this law, the total mass of reactants in the chemical reaction should be equal to the total mass of the products in a balanced chemical equation.

The given equation of the reaction of sodium chloride and fluorine is:

[tex]NaCl + F_2 \longrightarrow NaF + Cl_2[/tex]

The balanced chemical equation for the above reaction NaCl ad F₂ is:

[tex]2NaCl + F_2 \longrightarrow 2NaF + Cl_2[/tex]

Therefore the coefficients to balance the given equation are 2, 1, 2, 1.

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Answer:

cotyledons

Explanation:

A vascular plant that produces flowers, reproduces with seeds, and has two cotyledons is known as a Eudicot. Examples include dandelions and violets. They make up two-thirds of all flowering plants.

A plant that is vascular, produces flowers, reproduces with seeds, and has two cotyledons belongs to the Eudicots, also known as true dicots. Examples of these plants include dandelions or violets. They possess vascular tissue that forms a ring in the stem and their flower parts come in four, five, or many whorls. Seed plants, like eudicots, are further divided into those that produce seeds in cones and those that produce seeds in the ovaries of flowers.

Additionally, eudicot plants have two cotyledons, and the veins form a network in their leaves. Their root system is generally characterized by one main root that develops from the embryonic radicle. Eudicots constitute about two-thirds of all flowering plants which also makes them a significant part of the angiosperms - a division of plants that emerged about 160 million years ago.

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The mass of carbon dioxide gas occupying a volume of 81.3 L at 204 kPa and 95 °C is calculated using the ideal gas law and converting the pressure and temperature to compatible units, followed by converting moles to mass using the molar mass of CO2.

To determine the mass of carbon dioxide gas that occupies a given volume under specific conditions of pressure and temperature, we can use the ideal gas law. The ideal gas law is represented by the equation PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

Firstly, we need to convert the temperature from Celsius to Kelvin by adding 273.15 to the Celsius temperature:
T(K) = 95 °C + 273.15 = 368.15 K

The pressure needs to be converted from kPa to atm because the standard value for the gas constant R is usually given in units of L atm/mol K. The conversion factor is 1 atm = 101.325 kPa, so:
P(atm) = 204 kPa / 101.325 kPa/atm = 2.012 atm

Using the ideal gas law, we can solve for the number of moles:
n = PV / RT = (2.012 atm)(81.3 L) / (0.082057 L atm/mol K)(368.15 K)

After calculating n, we then convert moles to mass using the molar mass of CO2, which is 44.01 g/mol. The final mass, in grams, will be the product of the number of moles and the molar mass.

Final answer:

To find the mass of the AlF₃ sample that requires 3350 J to increase its temperature from 25°C to 80°C, we use the heat capacity formula. The specific heat capacity of aluminum (900 J/kg°C) is used and the mass is calculated to be 0.0677 kg or 67.7 grams.

Explanation:

To calculate the mass of the sample of AlF₃ that needed 3350 J of heat to raise its temperature from 25°C to 80°C, we use the heat capacity formula:

Q = mcΔT, where Q is the heat added, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature.

The specific heat capacity of aluminum is 900 J/kg°C. Then we will solve for the mass (m) and rearrange the formula to m = Q/(cΔT).

Given that:

The calculation for the mass m is:

m = 3350 J / (900 J/kg°C × 55°C)

m = 3350 J / (49500 J/kg)

m = 0.0677 kg

Therefore, the mass of the AlF₃ sample is 0.0677 kg or 67.7 grams.