When stirred in 30°C water, 5 g of powdered potassium bromide, KBr, dissolves faster than 5 g of large crystals of potassium bromide. Which of the following best explains why the powdered KBr dissolves faster?
A. Potassium ions and bromide ions in the powder are smaller than potassium ions and bromide ions in the large crystals.
B. Powdered potassium bromide exposes more surface area to water molecules than large crystals of potassium bromide.
C. Fewer potassium ions and bromide ions have been separated from each other in the powder than in the crystals.
D. Powdered potassium bromide is less dense than large crystals of potassium bromide.

Answer: Ancwer C or #3

Explanation:

Energy is transferred to an object when work(mechanics) is done on the object.  Work is the transfer of energy that occurs when a force is applied to an object that causes it to move some distance.  Notice that work(mechanics) is done on the object only if the object moves; if the object does not move, no work was done.  If you try to pick up the box of books, but are unable to lift it because it is too heavy, no matter how much effort you exert, you perform no work on the box and no energy is transferred.  

The volume of the ethanol that has a density of ethanol is 0.789 g/cm³ is 209.13cm³.

The volume of a substance can be calculated by dividing the mass of the substance by its density as follows:

Volume = mass ÷ density

According to this question, the density of ethanol is 0.789 g/cm³. A flask holds 165.0 g of ethanol and the volume can be calculated as follows:

Volume = 165.0g ÷ 0.789g/cm³

Volume = 209.13cm³

Therefore, the volume of the ethanol that has a density of ethanol is 0.789 g/cm³ is 209.13cm³.

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The claim that the strongest intermolecular interactions between propanol molecules arises from hydrogen bonding is True.

Intermolecular forces are weaker attraction forces that are utilized to define physical characteristics of molecules such as:

Hydrogen bonding is an type of intermolecular forces.

It is a type of dipole-dipole interaction that only happens when a hydrogen atom is connected to the atomic element of oxygen, nitrogen, or fluorine.

From the question given, in the propanol (CH3CH2CH2OH) molecule, the hydrogen usually has a partially positive charge which attracts the partially negative charge of the oxygen.

Therefore, we can conclude that the claim is True.

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To determine the mass of CO₂, the following must be known :

Reaction

Decomposition of CaCO₃

CaCO₃ ⇒ CaO + CO₂

Given the mass of  CaCO₃, so to determine the mass of CO₂ :

1. Find the mol of  CaCO₃ from the molar mass of  CaCO₃

\(\tt n_{CaCO_3}=\dfrac{mass~CaCO_3}{MW~CaCO_3}\)

2. Find the mole ratio of  CaCO₃ : CO₂(from equation = 1 : 1)

\(\tt n_{CaCO_3}\div n_{CO_2}=1\div 1\)

3. Find the mass of CO₂ from the molar mass of CO₂

\(\tt mass_{CO_2}=n_{CO_2}\times MW_{CO_2}\)

Answer:

1 3 and 5

Explanation:

Answer:

vibration of particles...........

There will be 0.4589 mL of ethyl acetate left in the space after evaporation.

The conversion of a liquid substance into a gas is known as evaporation. As a result of the liquid absorbing energy from its surroundings, molecules begin to travel faster and faster until they finally become a vapour and escape into the environment. Usually, the energy is absorbed as heat, but it can also be in the form of light or electricity.

No, the ethyl acetate won't all evaporate. The amount of ethyl acetate that will stay in the space after evaporation can be determined using the ideal gas law. As per the ideal gas law, PV = nRT

P is the overall system pressure, V is the room's volume, n is the amount of ethyl acetate in moles, R is the ideal gas constant, and T is the temperature.

To solve for n, the quantity of moles of ethyl acetate, we can rearrange the equation as follows: n = PV/RT

When the values are plugged in, we get:

n = (94.9 torr)(7.25 m x 2.75 m x 2.75 m)/(8.314 J/K mol)(298 K)

\(n = 4.666 \times 10^{-3} mol\)

The molar mass of ethyl acetate (88.11 g/mol) can then be used to compute the mass of ethyl acetate:

Mass = \(n \times M = (4.666 x 10^{-3} mol)(88.11 g/mol)\) = 0.4125 g

Using the density of ethyl acetate (0.901 g/mL), it is possible to determine the volume of the liquid that is still present:

Volume = mass/density = (0.4125 g)/(0.901 g/mL) = 0.4589 mL

As a result, there will be 0.4589 mL of ethyl acetate left in the space after evaporation.

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Answer:

see below

Explanation:

1) here we are given that one mole of propane releases 2221kJ of energy.

now use unitary method as ,

to burn 1 mol (44g) propane 2221kJ of energy is required

to burn 1g of propane 2221kJ/44g of energy is required

therefore to burn 25g of propane 2221/44*25kJ of energy is required= 1261.93kJ ≈ 1262 kJ

Hence 1262kJ of energy is required to burn 25g propane.

2) amount of heat absorbed= 25kJ

amount of work done = 12J

change in energy= (25-12)kJ = 13kJ

Hence the value of ∆E is 13kJ .

and we are done!

Answer:

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Explanation:

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Answer:

ok

asap what is the meaning of it?

The volume of \(H_2S\)collected at 32°C when the atmospheric pressure was 749 torr is approximately 0.0231 liters.

To calculate the volume of \(H_2S\)collected, we need to use the ideal gas law equation:

PV = nRT

Where:

P = total pressure (in torr)

V = volume of gas (in liters)

n = number of moles of gas

R = ideal gas constant (0.0821 L·atm/(mol·K))

T = temperature (in Kelvin)

First, let's calculate the number of moles of \(H_2S\)produced. From the balanced chemical equation, we see that 1 mole of CuS reacts to produce 1 mole of \(H_2S\). Given the molar mass of CuS (63.5 g/mol) and the mass of CuS (4.22 g), we can calculate the number of moles:

moles of CuS = mass of CuS / molar mass of CuS

moles of CuS = 4.22 g / 63.5 g/mol

moles of CuS ≈ 0.0664 mol

Since the reaction produces 1 mole of \(H_2S\)for every mole of CuS, the number of moles of \(H_2S\)is also 0.0664 mol.

Next, let's convert the temperature from Celsius to Kelvin:

T(K) = T(°C) + 273.15

T(K) = 32°C + 273.15

T(K) ≈ 305.15 K

Now, we can calculate the partial pressure of \(H_2S\)using Dalton's law of partial pressures:

Partial pressure of \(H_2S\)= Total pressure - Vapor pressure of water

Partial pressure of \(H_2S\)= 749 torr - 36 torr

Partial pressure of \(H_2S\)≈ 713 torr

Finally, we can rearrange the ideal gas law equation to solve for the volume:

V = (nRT) / P

V = (0.0664 mol * 0.0821 L·atm/(mol·K) * 305.15 K) / 713 torr

V ≈ 0.0231 L

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The word "symptom" refers to a specific manifestation or indication of a condition, disease, or disorder that is experienced or observed by an individual.

Symptoms are subjective or objective changes in the body's normal functioning that may be recognized as abnormal, uncomfortable, or problematic. Symptoms can manifest in various ways depending on the nature of the underlying condition. They can be physical, such as pain, rash, cough, fever, or fatigue, indicating an illness or injury affecting the body. Symptoms can also be psychological, such as anxiety, depression, or confusion, reflecting disturbances in mental health.

Symptoms serve as important clues for medical professionals to identify and diagnose diseases or disorders. They provide valuable information about the nature, severity, and progression of an illness, helping healthcare providers formulate appropriate treatment plans. Additionally, symptoms may also be important for individuals to self-assess their own health status and seek appropriate medical attention.

It is essential to note that symptoms alone may not provide a definitive diagnosis, as they can overlap across different conditions. Further evaluation, including medical tests and examinations, is often necessary to confirm a diagnosis and determine the appropriate course of action.

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The limiting reactant is iron ore, the theoretical yield of iron metal is 701.344 kg, and the theoretical yield of carbon dioxide is 413.292 kg.

From the equation of the reaction:

\(2 Fe_2O_3(s) + 3 C(s) --- > 4 Fe(s) + 3 CO_2(g)\)

The mole ratio of iron ore to carbon is 2:3.

Mole of 1000 kg of iron ore = 1000000/159.69

                                          = 6,262 moles

Mole of 120 kg carbon = 120000/12

                                 = 10,000 moles

Thus, it appears that the carbon is in excess while the iron ore is limited in availability.

The mole ratio of the iron ore and the iron produced is 1:2. Thus, the equivalent number of moles of iron produced will be:

              6,262 x 2 = 12,524 moles

Mass of 12,524 moles of iron = 12,524 x 56

                                                = 701,344 g or 701.344 kg

Thus, the theoretical yield of iron is 701.344 kg.

The mole ratio of the iron ore and the carbon dioxide produced is 2:3. The equivalent mole of carbon dioxide produced will be:

         6,262 x 3/2 = 9,393 moles

Mass of 9,393 moles carbon dioxide = 9,393 x 44

                                                         = 413,292 or 413.292 kg

The theoretical yield of carbon dioxide is, therefore, 413.292 kg.

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From the density of ethanol given, the number of pounds of ethanol in the drum will be 46.099 pounds.

Density of ethanol = 0.789/cm³

1 gallon = 3785.4ml

Volume of ethanol = 7 gallons = 7 × 3785.4ml = 26497.8ml

Mass of ethanol = Volume × Density.

= 26497.8 × 0.789

= 20906.764g

Since 1g = 0.002205 pounds, the mass of ethanol will be:

= 20906.764 × 0.002205

= 46.099 pounds.

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Answer:

approximately 251.55 grams of AuCl3 would contain 5.0 x 10^23 molecules.

Answer:

measles are caused by virus

strep throat is caused by bacterium

aspergillosis caused by fungus

malaria caused by protist

hope this helps!

Explanation:

The volume of KCN = 0.356 L

Molarity is a way to express the concentration of the solution

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

\(\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}\)

Where

M = Molarity

n = number of moles of solute

V = Volume of solution

mol of KCN = 7.47 x 10⁻³

Molarity of KCN = 0.0210 M

The volume :

V = n : M

V = 7.47 x 10⁻³ : 0.0210

V = 0.356 L

Answer:

The mixture (B + C) will change from liquid to gases.

This is because at constant temperature, the mixture will evaporate.

Graph 1 is expected to be assigned for the mixture (B + C)

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Potential energy is often referred to as the energy of position or composition. The energy that an object has due to its tension, electric charge, or relative immobility in space is known as potential energy. Potential energy is among the two basic forms of energy.

William Rankine, a Scottish engineer and physicist, coined the phrase "potential energy" in the 19th century. Potential energy comes in a variety of forms, each linked to a particular kind of force. It is the power imparted to an object by its position in relation to other objects. Learn more about potential energy in this article, which includes a definition, several categories, and examples.

The force acting on the two objects affects the formula for potential energy. The following is the formula for gravitational force:

W = m×g×h = mgh

Where,

Potential Energy Unit

In terms of units, kinetic energy and gravitational potential energy are equivalent: kg m2 / s2.

The unit used to measure all energy is the joule, which has the same units as kg m2 / s2 (J).

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The formula represents dissociated free ions as dissolved ionic compounds. An illustration is AgNO3(aq) + NaCl(aq) = AgCl(s) + NaNO3 (aq).

We only need to take out the spectator ions in order to formulate the net ionic equation. We are left with the net ionic equation after removing the spectator ions! The net ionic equation can be obtained by repeating this procedure for any reaction.

When a reaction reaches equilibrium, or when the concentrations of the reactants and products stop changing, it is said to be "finished." The answer becomes more straightforward if the equilibrium constant is large: the reaction is complete when the concentration of a reactant reaches zero.

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The amount of energy required to heat 100 g of water is 268000 J.

Energy is the ability or the capacity to perform work.

To calculate the amount heat energy required to change the water to steam, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the amount of energy required is 268000 J.

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Answer:

Aspirin binds to and acetylates serine (an amino acid used by the body to make proteins) residues in the active site of cyclooxygenase enzymes, leading to reduced production of prostaglandin. This in turn mediates aspirin's effect of reduced inflammation and pain in affected tissues.

Explanation:

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Explanation:

petrol or bitumen and at least one use of petrol and at least one use of bitumen eg petrol has a lower boiling point and is used as a fuel in cars, bitumen is more viscous and is used to surface roads.Aug 19, 2015

Petrol and bitumen fractions differ in their properties and uses in a number of ways with regard to melting point, viscosity, ignition ,combustion .

Petrol has less number of carbon chains while bitumen has large number of carbon chains.Bitumen has higher melting and boiling point as compared to petrol.

Petrol has higher viscosity as compared to bitumen.It combusts easily while bitumen does not combust completely ,it produces large number of carbon monoxide or soot.

Petrol fractions are used in cars,motorbikes,etc. while bitumen fractions are used in road surfaces and roofing. Boiling point of petrol is 35-70°C while that of bitumen is 700°C.Bitumen is more viscous as compared to petrol.

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Chlorine is more reactive than bromine because it replaces both bromine and iodine.

Fluorine is the most sensitive while on the other hand, the astatine is the least reactive as compared to other elements. The chlorine displaces both bromine and iodine, and bromine displaces iodine because of its high reactivity. The element that replaces other atom is considered as more reactive.

The order of reactivity is that the chlorine is more reactive than bromine, which indicates that chlorine is more reactive than iodine.

So we can conclude that chlorine is more reactive than bromine due to high reactivity.

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The percent yield of ammonia in the reaction  is 79.045%

The reaction of the formation of ammonia when hydrogen and nitrogen reacts is as follows:

                  N₂ + 3H₂ -------------> 2NH₃

It is given that 5.18g of Hydrogen gas and nitrogen gas reacted to produce 23.2g of Ammonia. To find the percent yield, the following formula is to be used:

Percent yield = Actual yield/ Theoretical yield x(100)

To calculate the actual yield of Ammonia, we get

Actual yield = (5.18g of H₂/1) x (1 mole of H₂ / 2g of H₂) x (2 moles of NH₃/ 3 moles of H₂) x (17g of NH₃/1 mole of NH₃)

= 5.18 x 0.5 x (34/3)

= 88.06/3

Actual yield = 29.35g

Therefore, the actual yield of ammonia is 29.35g

From this we can calculate the percent yield as follows:

Percent yield = 23.2/29.35 x(100)

Percent yield = 79.045%

Therefore the percent yield if 5.18 g of hydrogen gas and excess nitrogen gas were reacted to produce 23.2 g of ammonia is 79.045%

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Answer and Explanation: A molecule consisting of central atom with three bond pairs and one lone pair of electrons will have trigonal pyramidal shape.

Answer:

Explanation:

Here, we want to select the way fire extinguishers put out a fire

The method through which they put out fire is by cutting off the oxygen supply

When the oxygen supply is cut off or enveloped, the support for burning dwindles

Thus, the correct choice of an answer here is Starving

Many island chains were formed as a result of blank volcanism is known as hotspot volcanism.

Hotspot volcanism occurs when a mantle plume, a column of hot and buoyant rock material rising from deep within the Earth's mantle, reaches the surface. These mantle plumes are stationary relative to the moving tectonic plates on the Earth's surface.

As the tectonic plate moves over the stationary hotspot, the mantle plume melts and produces magma. This magma rises through the Earth's crust, creating a volcanic eruption. Over time, repeated eruptions build up layers of lava and volcanic material, forming a cone-shaped volcano. As the tectonic plate continues to move, the volcano becomes inactive, and a new volcano forms above the stationary hotspot.

However, in the case of island chains, the tectonic plate movement carries the volcanoes away from the hotspot. As a result, a trail of extinct volcanoes is left behind, forming a linear chain of islands. Each island in the chain represents a period of volcanic activity at that specific location as the plate moved over the hotspot.

Hotspot volcanism and the formation of island chains provide valuable insights into the dynamics of Earth's mantle and plate tectonics. By studying the age progression of islands in a chain, scientists can gain a better understanding of the movement and speed of tectonic plates and the behavior of mantle plumes deep beneath the Earth's surface.

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Answer:

Metal

Explanation:

Rubber and Wood are insulators. and Cotton is neither a insulator nor a conductor. But Metals are conductors

Question asked: Which of the following materials will conduct electricity well?

Answer: Metal

____________________________________________________

I hope this helps!

Answer:

198 g of water (H2O).

Explanation:

What is given?

Mass of methane (CH4) = 88 g,

Molar mass of CH4 = 16 g/mol,

Molar mass of water (H2O) = 18 g/mol.

Step-by-step solution:

First, let's convert 88 g of CH4 to moles using its molar mass:

In the chemical equation you can see that 1 mol of CH4 reacted produces 2 moles of H2O, so let's see how many moles of H2O can be formed by 5.5 moles of CH4, as follows:

The final step is to convert 11 moles of H2O to grams using the molar mass of H2O, like this:

The answer would be that we can produce 198 g of water (H2O) by 88 g of methane (CH4).

The non-metal elements in Group 7 – known as the halogens – get less reactive as you go down the group

Answer & Explanation:

The reactivity of elements in Group VII, also known as Group 17, decreases with increasing atomic radius. This is because halogens have high electronegativities and a proclivity to gain electrons in noble gas configurations. Myths are traditional stories or beliefs that explain cultural or societal beliefs, customs, or natural phenomena. They can be passed down through generations and can be based on true or fictitious events. Mythology, on the other hand, is the collection of myths associated with a specific culture or religion. Mythology can be amplified through retelling, incorporation into religious practices; association with significant events or figures, and adaptation into other media forms such as literature, film, or art.