Suppose 50.0 ml of 0.125 M HCl is mixed with 75.0 ml of 0.200 M Ca(OH)2.

a) Calculate the concentration, in moles per liter, of each of the ions present after mixing. Assume that the volumes are additive.

b) Which is greater, moles of H+ or moles of OH-?

c) How much more of the greater one do you have? Determine the concentration.​

the final temperature after 840 Joules is absorbed by 10.0g of water at 25.0oC at 45°C.

Explanation:

Data given:

initial temperature (T)= 25 degrees Celsius

mass of water = 10 gram

cp of water = 4.2J/gram Celsius

energy absorbed (q) = 840 joules

change in temperature = final temperature(t2) - initial temperature (t1)

so ΔT ( t-25)

Using the equation.

q= mcΔT

putting the values in the equation:

840 = 10 x 4.2 x (t-25)

t -25 = [tex]\frac{840}{10 x 4.2}[/tex]

t = [tex]\frac{840}{10 x 4.2}[/tex] +25

  = 45 °C

The final temperature of 10 gram of water which absorbed 840 joules of energy at an initial temperature of 25 degrees and final temperature of 45 degrees.

According to specific heat capacity, the final temperature of water is 45°C.

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

The given values are ,

Q=840 J

m=10 g

c=4.2 J/g°C

T₁=25°C

Substitution of values in the formula gives,

[tex]840=10\times4.2\times(T_2-25)\\84=4.2 T_2-105\\T_2=\dfrac{84+105}{4.2}\\=45^\circ C[/tex]

Thus,  final temperature of water is 45°C.

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Answer:

The new pressure will increase.

Explanation:

If the temperature in a tank increases, the pressure inside the tank will also increase. This is one of the postulates of the general gas law.

Pressure exerted by a gas is it's force per unit area.

  "at constant volume, the pressure of a given mass or mole of gas varies directly with the absolute temperature" .

    The higher the pressure, the higher the temperature will be.

Since the complete parameters are not given, use this expression below:

         [tex]\frac{P_{1} }{T_{1} } = \frac{P_{2} }{T_{2} }[/tex]

where P and T are pressure and temperature

           1 and 2 represents initial and final states.

The new pressure in the tank when the temperature is increased to 85°C can be calculated using Charles's Law, which requires converting temperatures to Kelvin and then applying the formula P1/T1 = P2/T2.

To calculate the new pressure in the tank when the temperature is increased to 85°C, we can apply Charles's Law, which states that for a fixed amount of gas at constant volume, the pressure is directly proportional to its temperature in Kelvin. This implies that if the temperature increases, the pressure will also increase proportionally. To find the new pressure P₂, we use the equation P₁/T₁ = P₂/T₂, where P₁ is the initial pressure, T₁ is the initial temperature, P₂ is the final pressure, and T₂ is the final temperature.

For example, if a gas tank has an initial pressure P₁ of 1.0 atm at a temperature of 20°C (which is 293.15 K when converted to Kelvin), and the temperature is increased to 85°C (358.15 K in Kelvin), the new pressure P₂ can be calculated as follows:

P₂ = P₁ × (T₂ / T₁)

P₂ = 1.0 atm × (358.15 K / 293.15 K)

P₂ would then be calculated to find the pressure at the higher temperature.

Answer:

Hello, Your answer will be B,C,E, And F.

Explanation:

An element is a substance whose atoms have same number of protons which means all atoms in an element have same atomic number. Elements are simplest substances which cannot be broken down by physical changes or chemical reactions. Elements are classified by their names and symbols. Hope That Helps!

Answer:

your answer would be A,B and E

Explanation:

i got it right on edge

Answer: It is a combination of hills, mountains, and plains

Explanation:

The statement best describes the Italian peninsula, it is a combination of hills, mountains, and plains.

It is also known as the Apennines peninsula, and it is extended from the southern Alps to the northern Mediterranean Sea.

It is one of the three greatest peninsulas.

This peninsula was started to be formed in 1861.

Thus, the correct option is C, It is a combination of hills, mountains, and plains.

Learn more about the Italian peninsula

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Answer:

It is termed a buffering agent

Explanation:

A buffering agent consist of a weak acid and a base that is used to maintain the acidity of a solution after the addition of

another acid or base

A buffer is used to prevent any rapid change in ph

Final answer:

To find the new volume of the gas when the pressure changes from 99.6 kPa to 93.3 kPa, one applies Boyle's Law, resulting in a new volume of 4.53 L.

Explanation:

The question involves using Boyle's Law, which states that for a given mass of ideal gas at constant temperature, the product of pressure and volume is constant. In the given example, the initial condition is a volume of 4.23 L of gas at a pressure of 99.6 kPa. When the pressure changes to 93.3 kPa, we want to find out what the new volume of the gas will be, assuming temperature and amount remain constant. We can use the equation:

P1 * V1 = P2 * V2

Where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume respectively. Plugging in the initial conditions and solving for V2 gives us the formula:

V2 = (P1 * V1) / P2

Inserting the values:

V2 = (99.6 kPa * 4.23 L) / 93.3 kPa = 4.53 L

So the new volume of the gas will be 4.53 L after the pressure has been adjusted to 93.3 kPa.

Subsoil is the layer of soil under the topsoil on the surface of the ground.

Answer:

Subsoil is the layer of soil under the topsoil

Explanation:

Answer:

The molar mass of the gas is 32.03 g/mol

Explanation:

Pressure of gas = P = 0.961 atm

Volume occupied by gas = V = 1.00 L

Temperature = T = 27[tex]^{\circ}C[/tex] = 300 K

Assuming M g/mol be the molar mass of the gas and the gas behaves as an ideal gas.

The ideal gas equation is shown below

[tex]\textrm{PV} =\textrm{nRT} \\\textrm{PV} = \displaystyle \frac{m}{M}\textrm{ RT } \\0.961 \textrm{ atm}\times 1.00 \textrm{ L} = \displaystyle \frac{1.25 \textrm{ g}}{M}\times 0.0821 \textrm{ L.atm.mol}^{-1}.K^{-1}\times 300\textrm{K} \\M = 32.03 \textrm{ g/mol}[/tex]

Molar mass of given sample of gas = 32.03 g/mol

Answer:

Bond length or bond distance is defined as the average distance between nuclei of two bonded atoms in a molecule.

Explanation:

Answer:

In molecular geometry, bond length or bond distance is defined as the average distance between nuclei of two bonded atoms in a molecule.

Explanation:

It is a transferable property of a bond between atoms of fixed types, relatively independent of the rest of the molecule.

Energy is the capacity to do work. Work is the process of causing matter to move against an opposing force, such as inflating a bicycle tire.

Energy can be defined as the capacity to supply heat or do work. One type of work is the process of causing matter to move against an opposing force. For example, we do work when we inflate a bicycle tire—we move matter (the air in the pump) against the opposing force of the air already in the tire.

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1. 0.240 liters of water would be needed to dissolve 21.6 g of lithium nitrate to make a 1.3 M (molar) solution.

2. 2.9 M is the molarity of a solution made of 215.1 g of HCl is dissolved to make 2.0 L of solution.

3.83.3 ml of concentrated 18 M H2SO4 is needed to prepare 250.0 mL of a 6.0 M solution.

4. 135 ml of stock HBr will be required to dilute the solution.

5. 150 ml of water should be added to 50.0 mL of 12 M hydrochloric acid to make a 4.0 M solution

6. The pH of the resulting solution is 13.89

Explanation:

The formula used in solving the problems is

number of moles= [tex]\frac{mass}{atomic mass of one mole}[/tex]      1st equation

molarity = [tex]\frac{number of moles}{volume}[/tex]            2nd equation

Dilution formula

M1V1 = M2V2          3rd equation

1. Data given

mass of Lithium nitrate = 21.6 grams

atomic mass of on emole lithium nitrate = 68.946 gram/mole

Molarity is given as 1.3 M

VOLUME=?

Calculate the number of moles using equation 1

n = [tex]\frac{21.6}{68.946}[/tex]

  = 0.313 moles of lithium nitrate.

volume is calculated by applying equation 2.

volume = [tex]\frac{0.313}{1.3}[/tex]

            = 0.240 litres of water will be used.

2. Data given:

mass of HCl = 215.1 gram

atomic mass of HCl = 36.46 gram/mole

volume = 2 litres

molarity = ?

using equation 1 number of moles calculated

number of moles = [tex]\frac{215.1}{36.46}[/tex]

number of moles of HCl = 5.899 moles

molarity is calculated by using equation 2

M = [tex]\frac{5.899}{2}[/tex]

   = 2.9 M is the molarity of the solution of 2 litre HCl.

3. data given:

molarity of H2SO4 = 18 M

Solution to be made 250 ml of 6 M

USING EQUATION 3

18 x V1= 250 x 6

V1 = 83.3 ml of concentrated 18 M H2SO4 will be required.

4. data given:

M1= 10M, V1 =?, M2= 3 ,V2= 450 ml

applying the equation 3

10 x VI = 3x 450

V1 = 135 ml of stock HBr will be required.

5. Data given:

V1 = 50 ml

  M1= 12 M

  V2=?

  M2= 4

applying the equation 3

50 x 12 = 4 x v2

V2 = 150 ml.

6. data given:

HCl + NaOH ⇒ NaCl + H20

molarity of NaOH = 0.525 M

volume of NaOH = 25 ml

molarity of acid HCl= 75 ml

volume of HCl = 0.335 ml

pH=?

Number of moles of NaOH and HCl is calculated by using equation 1 and converting volume in litres

moles of NaOH = 0.0131

moles of HCl= 0.025 moles

The ratio of moles is 1:1 . To find the unreacted moles of acid and base which does not participated in neutralization so the difference of number of moles of acid minus number of moles of base is taken.

difference of moles = 0.0119  moles ( NaOH moles is more)

Molarity can be calculated by using equation 1 in (25 +75 ml) litre of solution

molarity = [tex]\frac{0.0119}{0.1}[/tex]

             = 0.11 M (pOH Concentration)

14 = pH + pOH  

  pH  = 14 - 0.11

     pH    = 13.89

Answer:

1. dividing the mass of water lost by the mass of hydrate used is equal to the fraction of water in the compound. Multiplying this fraction by 100 gives the percent water in the hydrate.

2. hydrate or compounds that incorporate water molecules into the fundamental solid structure in a hydrate which usually has a Pacific crystalline form a Define number of water molecules are associated with each formula unit on the primary material Gypsum is a hydrate with two water molecules present for each formula unit of caso4 the chemical formula for Gypsum is caso4 . H2O

Answer:

45.4% and 54.6%

Answer:

What picture

Explanation:

Final answer:

Analyzing a photograph involves considering the context, motivations, and physical evidence within the image to determine why certain events are depicted. The underlying causes for events, whether in human behavior or natural processes, such as global warming from carbon dioxide, are critical for understanding the scene. The perspective of the photographer and the choice of images by editors also significantly influence the narrative constructed around the photograph.

Explanation:

Understanding the event depicted in a photograph requires analyzing various factors such as the context of the image, the physical and emotional states of any subjects present, and the environment. For example, a photo capturing a table with items like a cup, saucer, newspaper, and tickets might suggest a moment of daily life, perhaps the morning routine of an individual. However, these items could also indicate a broader story, perhaps of travel plans (suggested by the tickets), a reflection of personal habits or interests (indicated by the newspaper choice), or even the socioeconomic status of the individual (suggested by the type of cup and saucer).

Furthermore, understanding why certain events occur, whether in human behavior or physical sciences, involves identifying the underlying causes. For instance, the example of carbon dioxide trapping heat in the atmosphere to warm the planet serves as a clear illustration of how and why certain events, like global warming, occur.

In the case of human behavior captured in photographs, motivations such as love, hate, envy, greed, or a desire for power could play a crucial role in explaining the scene. The choice of angle and perspective by the photographer, as well as the decision by a newspaper editor to publish a particular image, further add layers of meaning, revealing not just the moment captured but also the storytelling intent behind it.

Answer:

Match each image with the correct state of matter.

A: Gas

B: solid

C: liquid

Explanation:

hope this helps

Absolute time is measured using fixed units, with early methods involving hourglasses using sand, and modern methods using atomic oscillations. Calendars derive from celestial motions, with years, months, and days based on Earth and the Moon's movements.

Absolute time is the measurement of time in fixed units such as seconds, minutes, days, and years. There are two main ways to record or measure absolute time: one is based on the duration of events, and the other is through periodic motion.

Early methods of measuring time duration included devices like hourglasses that used the flow of sand to measure the passing of time. Today, precise measurement of time uses the oscillation of physical phenomena, such as the vibration of a cesium atom to define a second.

As for periodic motion, our common calendar is derived from celestial movements: years from Earth's orbit around the Sun, months from the Moon's orbit around Earth, and days from Earth's rotation on its axis. These are fundamental in tracking the passage of time in our daily lives.

During endothermic phase change, the potential energy of the system always increases while the kinetic energy of the system remains constant. The potential energy of the reaction increases because energy is been added to the system from the external environment.

Explanation:

Answer:

d. Potential energy increases, and kinetic energy stays the same.

Explanation:

This is correct on edge.

The answers to the Enthalpy and Phase Changes quiz are:

1. D 25.0 kJ

2. A Delta Hfus

3. C heat of fusion

4. D Potential energy increases, and kinetic energy stays the same.

5. B This is an exothermic reaction that involves freezing.

6. B a thermometer

7. C 549 g

8. B Energy is absorbed, and potential energy increases.

9. D a solid to a liquid

10. C the periodic table

Cadaverine, a foul-smelling substance produced by the action of bacteria on meat, contains 58.55% C, 13.81% H, and 27.40% N by mass. The empirical formula of cadaverine is C2H7N.

Cadaverine is a foul-smelling substance produced by the action of bacteria on meat. It contains 58.55% C, 13.81% H, and 27.40% N by mass, and its molar mass is 102.2 g/mol.

To determine the empirical formula of cadaverine, we need to find the ratio of the number of atoms in the compound. We can assume a 100 g sample, which means we have 58.55 g of carbon (58.55% of 100 g), 13.81 g of hydrogen, and 27.40 g of nitrogen.

To find the moles of each element, we divide the mass by its molar mass:

Now, we divide each mole value by the smallest mole value (1.96) to get the simplest whole number ratio:

Since we can't have fractions in a molecular formula, we round each ratio to the nearest whole number:

Therefore, the empirical formula of cadaverine is C2H7N.

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Final answer:

Cadaverine is a diamine with a strong odor, resulting from bacterial decarboxylation of lysine in decaying meat. It is composed of C, H, and N, with a foul smell characteristic of decomposing animal matter. Aromatic amines, unlike cadaverine, are toxic and used industrially.

Explanation:

Cadaverine is a foul-smelling substance that is produced by the action of bacteria on meat. It contains 58.55% carbon (C), 13.81% hydrogen (H), and 27.40% nitrogen (N) by mass, and has a molar mass of 102.2 g/mol. This compound, along with another diamine called putrescine, is a result of the decarboxylation of amino acids, ornithine and lysine. These processes are part of what gives decaying animal matter its characteristic unpleasant odor. Amines like cadaverine are formed during the breakdown of proteins and often have odors associated with decay or putrefaction.

In contrast, aromatic amines are generally toxic and can be absorbed through the skin, requiring careful handling. They are used in industry in products like dyes and drugs but can be potent carcinogens.

OH- is common to bases.

Explanation:

The base is a is an ionic compounds which when placed in aqueous solution dissociates in to a cation and an anion OH-.

The presence of OH- in the solution shows that the solution is basic or alkaline.

From Bronsted and Lowry concept base is a molecule that accepts a proton for example in NaOH, Na is a proton donor and OH is the proton acceptor.

A base accepts hydrogen ion and the concentration of OH is always higher in base.

There is a presence of conjugate acid and conjugate base in the Bronsted and Lowry acid and base.

Conjugate acid is one which is formed when a base gained a proton.

Conjugate base is one which is formed when an acid looses a proton.

And from the Arrhenius base Theory, the base is one that dissociates in to water as OH-.

Answer:

metal and OH-

Explanation:

Answer:

precipitation and evaporation

Explanation:

salinity :salt concentration

Precipitation: this brings freshwater into the ocean which are not salty, so it is diluting its salt concentration.

evaporation: takes all the water and leaves the salt behind

Role of early genetic engineering for animal

Explanation:

Genetic engineering is the process of artificial alteration or manipulation of the original genetic makeup of an organism and then modification and recombination using technologies like the DNA recombinant technology.  

Early genetic engineering began with expressing specific bacterial genes by Cohen in 1973. Later due to various anxieties arising about hazardous reshaping of genetic systems, it came to a slowdown.

Then all these anxieties were subdued with the advent of DNA recombinant plasmid-based technology which was very helpful to understand the molecular genetic mechanisms in animals.

In animals genetic engineering is mainly used to find genes responsible for beneficial traits or characters introduce them into another animal’s genome and create a new offspring with the beneficial character.

The first animal which was created by genetic engineering was a mouse by Rudolf Jaenisch in 1974. Later many transgenic animals were developed like chicken, mice, cattle, sheep, pig etc.  

Answer: 1. P1V1 = P2V2

2. P stands for pressure

3. Units for Pressure are atm and Pa

4. V stands for volume

5. Units for volume is in mL

Explanation: Boyle's Law is a gas law that states the relationship between pressure and volume of a gas.

1. P₁V₁ = P₂V₂

2. P stands for pressure

3. Units for Pressure are atm and Pa

4. V stands for volume

5. Units for volume in mL

The volume of a gas at constant temperature varies inversely with the pressure exerted on it. It is given by:

P₁V₁ = P₂V₂

Where,

P is the pressure and

V is the Voulme

The units can be given in volume is measured in litres; pressure in atmospheres; and temperature in degrees Kelvin.

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Answer:

The  Final Temperature of water = 54.48°C.

Explanation:

Given,

Volume of water = 202 mL.

Initial Temperature T₁ = 32°C

Heat energy absorbed = 19 kJ = 19000 Joules

Final Temperature T₂ = ?

Final temperature can be calculated using the formula,

Q = (mass) (ΔT) (Cp)

Here  ΔT = T₂ - T₁

Cp = specific heat of water = 4.184 J/g°C.

For finding the mass, we use the formula,

Density = Mass/Volume

Since, Density of water =  1 g/mL.

Mass of water = 202 grams.

Now Substituting all values in the formula Q = (mass) (ΔT) (Cp)

19000 = (202)(T₂ - T₁)(4.184)

Solving, we get,

(T₂ - T₁) = 22.48°C

Therefore,  T₂ = 22.48°C + 32°C = 54.48°C.

Therefore, Final Temperature of water = 54.48°C.

Answer:

The Earth spins on its axis, but it also precesses about that same axis - it wobbles - and the Earth’s temperature is affected. A Desert makes a terrible heat; look at Arabia - it was once COVERED IN LUSH greenery - that is where The oil came from, millions of years of pressure on all that detritus. Britain was once very famous (2000 years ago) for all its wines - not so much now, huh?

Explanation:

Final answer:

The sun's energy affects Earth's climate through its intensity and distribution due to natural cycles and Earth's orbital dynamics, contributing to weather patterns and temperature variations.

Explanation:

Claims, Evidence, and Reasoning on Sun's Energy and Climate:

Here's a claim about how the sun's energy affects the climate of an area: The intensity and distribution of solar energy directly influence Earth's climate, leading to variations in temperature and weather patterns across the globe. The evidence supporting this claim includes the observation of the sun's natural 11-year cycle, which brings about small changes in the energy output that can affect climate patterns minimally. Additionally, scientific data shows that changes in Earth's orbit, tilt, and axial position can significantly alter the distribution of sunlight, leading to seasonal climate changes and potentially contributing to longer-term climate variations.

The reasoning behind this claim lies in the understanding of the greenhouse effect and how it modulates global temperatures. Gases in Earth's atmosphere trap heat from the sun, which can be intensified by stronger solar intensity resulting in global warming or reduced with weaker solar intensity leading to global cooling. The interactions among Earth's climate system components also regulate the overall climate, with the sun being the primary source of energy driving these interactions.

The volume of neon when the pressure is reduced to 93.3 kPa is 519 mL.

Explanation:

The kinetic theory of gases is mostly based on Boyle's law. From the Boyle's law, the pressure experienced by any gas molecules is inversely proportional to volume of the gas molecules. Also this inverse relation is obeyed if and only if the number of moles and temperature of the gas molecules remained constant.

So,[tex]P=\frac{1}{V}[/tex]

So if there is a change in pressure then there will be inverse change in volume. That means if there is decrease in the pressure of gas molecules then there will be increase in the volume and vice versa.

So the Boyle's law is combined as [tex]P_{1} V_{1} = P_{2} V_{2}[/tex]

As here the initial pressure or [tex]P_{1}[/tex] is 1 atm or 101.3 kPa and the initial volume is 478 mL. Similarly, the final pressure is 93.3 kPa and the final volume will be

[tex]101.3*10^{3}*478*10^{-3} = 93.3*10^{3} * V_{2}[/tex]

[tex]V_{2} = 519 mL[/tex]

So, the volume of neon when the pressure is reduced to 93.3 kPa is 519 mL.

Explanation:

nounZOOLOGY

(in an insect or amphibian) the process of transformation from an immature form to an adult form in two or more distinct stages

Answer: Metamorphosis is a process of the life cycle where an organism develops certain changes in its physical body.

Explanation: An example is the development of a cocoon to a larva changed into a pupa and finally into a butterfly.

Answer: The sequence from longest wavelength (radio waves) to shortest wavelength (gamma rays) is also a sequence in energy from lowest energy to highest energy. ... The energy carried by a radio wave is low, while the energy carried by a gamma ray is high. Different materials can block different types of light.

PLEASE MARK BRAINLIEST

They are both electromagnetic waves.

I hope this helps :/

Answer:

Heat required to melt 26.0 g of ice at its melting point is 8.66 kJ.

Explanation:

Number of moles of water in 26 g of water: 26× [tex]\frac{1}{18.02}[/tex] moles

                                                                      =1.44 moles

The enthalpy change for melting ice is called the entlaphy of fusion. Its value is 6.02 kj/mol.

we have relation as:

                                           q = n × ΔH

where:

q  = heat

n  = moles

Δ H  = enthalpy

So calculating we get,

                                        q= 1.44*6.02 kJ

                                        q= 8.66 kJ

We require 8.66 kJ of energy to melt 26g of ice.

Answer:

Percentage of water = 2%

Percentage of water = 21%

Percentage of water = 77%

Explanation:

Given data:

Number of molecules of glucose = 20

Number of molecules of hemoglobin = 210

Number of molecules of water = 770

Solution:

To calculate the percentage 1st of all we will determine the total number of molecules.

Total number of molecules = Number of molecules of water + hemoglobin + glucose

Total number of molecules = 770 + 210 + 20

Total number of molecules = 1000

Percentage of water:

Percentage of water = 770/1000 ×100

Percentage of water = 0.77 ×100

Percentage of water = 77%

Percentage of hemoglobin:

Percentage of water = 210/1000 ×100

Percentage of water = 0.21 ×100

Percentage of water = 21%

Percentage of hemoglobin:

Percentage of water = 20/1000 ×100

Percentage of water = 0.02 ×100

Percentage of water = 2%

Answer:3

Explanation: