why does chocolate melt faster when crushed?

Answer:

0.11mole

Explanation:

Let us assume that the condition is at standard temperature and pressure(STP);

 Given parameters:

        Volume of water  = 2.45L

   Unknown:

       Number of moles found in this volume of water  = ?

Solution;

 At STP;

                 Number of moles  = [tex]\frac{volume of gas}{22.4}[/tex]

 Input the parameters and solve;

                  Number of moles of water  = [tex]\frac{2.45}{22.4}[/tex]   = 0.11mole

The number of moles of water found is  0.11mole

Answer: chemical reaction

Explanation:

Al3+(aq)+PO4^3-(aq)+3SO4^2-(aq0 --> 3AlPO4(s)+3Na+(aq)

Answer:

B

Explanation:

B is the only possible answer that makes much sence, smoke is very toxic and it makes it hard to breath and is bad for your lungs

Answer:

186.9Kelvin

Explanation:

The ideal gas law equation is PV = n R T

where

P   is the pressure of the gas

V   is the volume it occupies

n  is the number of moles of gas present in the sample

R  is the universal gas constant, equal to  0.0821 atm L /mol K

T  is the absolute temperature of the gas

Ensure units of the volume, pressure, and temperature of the gas correspond to R ( the universal gas constant, equal to  0.0821 atm L /mol K )

n = 3.54moles

P= 1.57

V= 34.6

T=?

PV = n R T

PV/nR = T

1.57 x 34.6/3.54 x 0.0821

54.322/0.290634= 186.908620464= T

186.9Kelvin ( approximately to 1 decimal place)

Answer:

B.) Metal Rusts.

Thank You ☺️ ☺️.

Answer:

lemon juice

Explanation:OH is in bases and lemon juice is an acid

Answer:

A. Both freezing and melting are physical changes.

Explanation:

Even if you were to freeze water, the molecules are still water molecules, and vise versa with melting it.

Answer: Option A) Both melting and freezing are physical changes.

Explanation:

A physical change is one which is easily reversible and in which no new substances are formed.

Hence, since ice melts to form water (melting), and water freezes to form ice back (freezing), both melting and freezing are easily reversible and do not form new products.

Thus, both melting and freezing are physical changes.

Answer:

The answer is C.  It causes the collision of alpha particles.

Explanation:

Nuclear fusion is a process that produces heavier elements by combining lighter elements.

Nuclear fusion is a process in which two or more atomic nuclei come together to form a single, more massive nucleus, releasing a large amount of energy in the process. The answer to the question is It produces heavier elements. During nuclear fusion, lighter elements combine to form heavier elements. This process is responsible for the energy emitted by the sun and other stars. It does not create abundant radioactive material as nuclear fusion reactions do not produce long-lived radioactive waste like nuclear fission reactions. It does not cause the collision of alpha particles, as alpha particles are involved in nuclear decay processes. It also does not transform energy into mass, as mass is directly involved in nuclear reactions.

Hence the answer is Option A.

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Explanation:

The answer is 116 kJ . c - water's specific heat - 4.184 J/g⋅∘C . Then, you must provide enough heat to get all the water from liquid to steam.

Explanation:

acid - An acid is a substance or compound that releases hydrogen ions (H+) when in solution. ...

A base is a substance that releases hydroxyl ions (OH-) when in solution. ...

Figure 2.4. ...

pH is a unit of measurement of the concentration of hydrogen ions (H+) and hydroxyl ions (OH-) in an aqueous (water) solution

base - H 3O + is called a hydronium ion, and it makes things acidic. OH - is called a hydroxyl ion and it makes things basic.

Answer:

Mass of CaBr₂ = 179.9 g

Explanation:

Given data:

Volume of CaBr₂ solution = 450.0  mL (450/1000 = 0.45 L)

Molarity of solution = 2.00 M

Mass of CaBr₂ = ?

Solution:

Formula:

Molarity = number of moles / volume of solution in L

Now we will put the values.

2.00 M = number of moles / 0.45 L

Number of moles = 2 M  × 0.45 L

Number of moles = 0.9 mol  ( M = mol/L)

Mass of CaBr₂:

Mass of CaBr₂ = number of moles × molar mass

Mass of CaBr₂ = 0.9 mol  × 199.89 g/mol

Mass of CaBr₂ = 179.9 g

To prepare 450 mL of a 2.00 M CaBr2 solution, one would need 180 grams of CaBr2, calculated using the molarity formula and the molar mass of CaBr2.

To calculate the amount of CaBr2 needed to make a 2.00 M solution, we can use the formula: mass = molarity × volume × molar mass. The student wants a volume of 450 mL (0.450 L) of a 2.00 M CaBr2 solution. First, we need to find the molar mass of CaBr2 by adding the atomic masses of one calcium (Ca) atom and two bromine (Br) atoms. The atomic mass of Ca is approximately 40.08 g/mol, and the atomic mass of Br is approximately 79.90 g/mol. So, the molar mass of CaBr2 is 40.08 g/mol + (2 × 79.90 g/mol) = 199.88 g/mol.

Using the formula we have: mass = 2.00 M × 0.450 L × 199.88 g/mol = 179.892 g. Rounding off, we need 180 grams of CaBr2 to create 450 mL of a 2.00 M solution.

Answer: 5.4 moles

Explanation:

Dinitrogen pentoxide has a chemical formula of N2O5

Now, based on Avogadro's law:

1 mole of any substance has 6.02 x 10^23 atoms

So, 1 mole of N2O5 = 6.02 x 10^23 molecules

Z moles of N2O5 = 3.25 x 10 ^ 24 molecules

To get the value of Z, cross multiply:

(3.25 x 10^24 molecules x 1mole) = (6.02 x 10^23 molecules x Z moles)

3.25 x 10^24 = (6.02 x 10^23 x Z)

Z = (3.25 x 10^24) ➗ (6.02 x 10^23)

Z = 5.4 moles

Thus, there are 5.4 moles of Dinitrogen pentoxide.

Answer:

5.39

full answer: 5.396878114

Explanation:

divide 3.25*10^24 over 6.022*10^23(which is a mole of anything in particles)

Answer: The partial pressure of nitrogen on Venus is 81 mmHg

Explanation:

To calculate the partial pressure of the gas, we use the equation given by Raoult's law, which is:

[tex]p_{A}=p_T\times \chi_{A}[/tex]

where,  

[tex]p_A[/tex] = partial pressure of nitrogen gas = ?

[tex]p_T[/tex] = total pressure = 2700 mmHg

[tex]\chi_A[/tex] = mole fraction of nitrogen gas = 3.0 % = 0.03

Putting values in above equation, we get:

[tex]p_{N_2}=2700mmHg\times 0.03\\\\p_{N_2}=81mmHg[/tex]

Hence, the partial pressure of nitrogen on Venus is 81 mmHg

Answer:

42

Explanation:

Divide the distance by the time.

If a dolphin is producing a vocalization with a frequency of 35 Hz, traveling at 1470 m/s, then wavelength of sound is 42m.

Wavelength of sound will be calculated by using the below formula as:

λ = υ / f, where

υ = velocity or speed of sound = 1470 m/s

f = frequency of wavelength = 35 Hz

On putting values we get

λ = 1470 / 35 = 42m

Hence resultant wavelength of sound is 42m.

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Answer:

It is thinner than the continental crust.

Explanation:

The oceanic crust is largely made up of basalt, a dense type of rock that forms from solidified lava, and it is thinner than the continental crust that is mainly composed of granite.

The oceanic crust is primarily composed of a type of rock known as basalt. This is a dark, dense igneous rock that forms due to the cooling and solidifying of lava. In contrast to the granitic composition of the continental crust, the oceanic crust's basaltic composition is denser but thinner than the continental crust. Hence, the oceanic crust is not made mostly of granite, limestone or salt, but rather, it is predominantly basalt and it is not thicker but thinner than continental crust.

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Answer:

22.656 grams of oxygen gas are there in a 2.3L tank at 7.5 atm and 24° C

Explanation:

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law:

P * V = n * R * T

where R is the molar constant of the gases and n the number of moles.

In this case you know:

Replacing:

[tex]7.5 atm* 2.3 L=n*0.082 \frac{atm*L}{mol*K} *297K[/tex]

Solving:

[tex]n=\frac{7.5 atm* 2.3 L}{0.082 \frac{atm*L}{mol*K} *297K}[/tex]

n=0.708 moles

Knowing that oxygen gas is a diatomic gas of molecular form O₂ and its mass is 32 g / mole, you can apply the following rule of three: if 1 mole contains 32 grams, 0.708 moles, how much mass will it have?

[tex]mass=\frac{0.708 moles*32 grams}{1mole}[/tex]

mass= 22.656 grams

22.656 grams of oxygen gas are there in a 2.3L tank at 7.5 atm and 24° C

Answer:

The mass of oxygen gas is 22.66 grams

Explanation:

Step 1: Data given

Volume of tank = 2.3 L

Pressure = 7.5 atm

Temperature = 24.0°C = 273 +24 = 297 K

Step 2: Calculate moles oxygen gas

p*V = n*R*T

⇒with p = the pressure of the oxygen gas = 7.5 atm

⇒with V = the volume of the tank : 2.3 L

⇒with n = the moles of oxygen gas = TO BE DETERMINED

⇒with R = the gas constant = 0.08206L*atm/mol*K

⇒with T = the temperature = 297 K

n = (p*V- / (R*T)

n = (7.5 atm * 2.3L) / (0.08206 L*atm/mol*L * 297K)

n = 0.708 moles

Step 3: Calculate mass of oxygen gas

Mass O2 = moles O2 = molar mass O2

Moles O2 = 0.708 moles * 32.0 g/mol

Moles O2 = 22.66 grams

The mass of oxygen gas is 22.66 grams

If the temperature of a gas changes, but the number of moles and volume remain constant, Pressure also changed. Therefore, option B is correct.

The amount of force exerted per area is defined as pressure. To generate a large amount of pressure, you can use either a large force or a force applied over a small area.

Pressure is a situation that can have serious consequences if you don't perform well; thus, performing under pressure. It appears to be a life-or-death situation: your reputation, a relationship, your success, or your safety are all at stake. Your inability to distinguish between stress and pressure can be detrimental.

Pressure changes when the temperature of a gas changes but the number of moles and volume remain constant.

Thus, option B is correct.

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Answer:

Temperature

Explanation:

Temperature is identified as a factor which will result in a shift in the chemical equilibrium.

This is defined as the point in which the concentrations of reactants and products remain constant with time.

Temperature could result in shifting the equilibrium to the left or right depending on factors such as nature of reactant etc.

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Answer: the answer is 180.5    i am 100% i just did the test

The heat that should be required to produce 44.8 L of NO by the reverse reaction is 180.5 J.

The heat energy should be converted from one body to the another due to which there should be the difference in the temperature. In the case when two bodies should be at the different temperature so here the energy should be transferred i.e. the heat should be flows i.e from the hotter body to the colder.

hence, The heat that should be required to produce 44.8 L of NO by the reverse reaction is 180.5 J.

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Answer:

all of them

Explanation:

Answer:

1,2,3,4,5

Explanation:

plz brainlest me

The neutron is most equal to a proton  in mass.

The mass of a neutron is 1.67492749804 × 10−27 kg, while the mass of a proton is 1.67262189832 × 10−27 kg. This means that the neutron is only about 0.1% heavier than the proton.

Electrons are much lighter than neutrons and protons, with a mass of 9.1093837015 × 10−31 kg. This means that the neutron is about 1,836 times heavier than the electron.

Atoms and molecules vary widely in mass, so it is impossible to say definitively which one is most equal to a neutron in mass. However, a typical atom, such as carbon, is about 12 times heavier than a neutron, while a typical molecule, such as water, is about 18 times heavier than a neutron.

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Answer:

D. The momentum of each object in the system remains the same

before and after a collision.

Explanation:

The law of conservation of momentum states that the momentum in a closed system does not change unless there is an outside force influencing the closed system.

After 90 days, two half-lives of a substance with a 45-day half-life will have passed, resulting in one-fourth or 25% of the original amount remaining.

If a substance has a half-life of 45 days, after 90 days, there would have been two half-lives that passed. During each half-life, half of the remaining substance decays. So after the first 45 days, you would be left with one-half of the initial amount, and after another 45 days (which totals 90 days), you would be left with half of that amount. This means after 90 days, one-fourth of the original substance would be left.

To calculate this, you can use the equation for exponential decay:

Final amount = Initial amount × [tex]1/2^{number of half lives}[/tex]

In this case, the number of half-lives is 90 days divided by the half-life of the substance, which is 45 days:

Number of half-lives = 90 days / 45 days per half-life = 2 half-lives

Therefore, the remaining amount of the substance would be:

Final amount = Initial amount ×(1/2)² = Initial amount ×1/4

This results in the correct answer that after 90 days, you'd have 25% or one-fourth of the original amount of the substance remaining.

Answer:

student 2 i took the quiz

Explanation:

Answer:

C6H12O6

Explanation:

This means that there are 6 carbon atoms, 12 hydrogen atoms and 6 oxygen atoms

Answer:

C6H12O6

Explanation:

Glucose is a aldohexose. It is a simple sugar with six carbon atoms. It is a monosaccharide. Molecular formula of glucose is C6 H12 O6.

Answer:

Neutral

Explanation:

Ionic compounds are electrically neutral because they form ionic bonds between positively and negatively charged atoms.

Answer:

neutral

Explanation:

just built different

Answer:

The final temperature is 22.2°C

Explanation:

Step 1:

Data obtained from the question. This includes the following:

Mass (M) = 25g

Heat (Q) = 2913 J

Initial temperature (T1) = 50.0°C

Final temperature (T2) =?

Specific heat capacity (C) = 4.184J/g°C

Step 2:

Determination of the final temperature.

The final temperature can be obtained as follow:

Q = MC(T1 – T2).. Since we are cooling

2913 = 25 x 4.184 (50 – T2)

2913 = 104.6 (50 – T2)

Divide both side by 104.6

50 – T2 = 2913/104.6

50 – T2 = 27.8

Collect like terms

T2 = 50 – 27.8

T2 = 22.2°C

The final temperature is 22.2°C

Final answer:

The motion in Newton's Cradle stops due to friction and air resistance, which convert the system's kinetic and potential energy into thermal energy, eventually causing the balls to stop swinging.

Explanation:

The motion of Newton's Cradle ultimately stops because of the effects of friction and air resistance, which are forms of dissipative forces. These forces act to gradually convert the kinetic energy and potential energy of the swinging balls into thermal energy, which is dissipated into the environment. While kinetic energy is transferred from one ball to the next in the cradle, a small amount of energy is lost with each collision and swing due to these forces, ultimately causing the balls to come to a rest.

In the idealized physics examples, such as a perfectly elastic collision where no kinetic energy is lost, the motion would continue indefinitely. However, in the real world, due to non-conservative forces like friction and air resistance, kinetic energy is not perfectly conserved in collisions and is instead transformed into other forms of energy, such as heat. This gradual loss of energy to the surroundings is why the height the balls reach in Newton's Cradle decreases over time, and they eventually stop moving.