what type of energy is stored as sugars in plant leaves
a. elastic B. chemical C. mechanical D. electrical ​

Answer:

The correct answer would be = 0.1593 mCi.

Explanation:

The initial 123I = 2.55 mCi (given)

We know that the half-life of radioactive I-123 =  12 hours approximately.

So, we can say that in 48 hours there will be four half-lives of 123I,

Hence after four half-life or 48 hours, the final 123I would be:

= 2.55 * (1/2⁴)

= 2.55 * (1/16)

= 0.1593 mCi

Thus, the correct answer would be = 0.1593 mCi.

Answer:

when energy and matter are paired together ,they are truly one in same

The statement "When energy and matter are paired with light, they are one and the same" is definitely true.

The Matter may be defined as a type of substance that is significantly made up of numerous types of particles that occupy the physical space and possess inertia. Everything that is present in the surroundings represents an example of matter.

According to the context of this question, energy and matter togetherly constitute the principle of the same component. This is because energy is a property that matter possesses to a large extent.

It may be thought the same amount of matter can have a different amount of energy and when they both get paired with light, they are one and the same.

Therefore, the statement "When energy and matter are paired with light, they are one and the same" is definitely true.

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Answer:

Earth is made of several subsystems or "spheres" that interact to form a complex and continuously changing whole called the Earth system.  to thousands of kilometers, and on time scales that range from milliseconds to billions of years of the Earth; earthquake; Examples of long term - making coal; plate tectonics

Explanation:

Methane is the unidentified gas since its molar mass is 16 g/mol.

When describing atomic masses and molecular masses, the Dalton (Da) or unified atomic mass unit (u) are two alternative units of mass that are frequently employed. It is known to be 1/12 the mass of a carbon-12 atom and is also referred to as "amu" in older.

We must be aware that a gas's molar mass directly relates to how long it takes to diffuse.

t1/t2 = √M1/M2

Let t1 equal the 1.50 minutes it takes for the combustible gas to disseminate. Let t2 equal the 4.73 minutes it takes for the bromine vapor to disperse.

M1 = the flammable gas's molar mass equals

160 g/mol is the molar mass of the bromine vapor, or M2.

replacing values.

1.50/4.73 = √M1/160

(1.50/4.73) ^2 = M1/160

0.1006 = M1/160

M1 = 0.1006 × 160

M1 = 16 g/mol

Methane is the gas in question.

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We can see here that the best fuel is the one that produces the most heat per unit mass. In this case, the fuel that produces the most heat per unit mass is methanol.

Fuel is a substance that is used to produce energy through combustion or other chemical reactions. It is commonly utilized to power various forms of transportation, generate heat or electricity, and operate machinery and appliances.

The results of the experiment are shown below:

Fuel            Mass (g)      Heat produced (J)       Heat per gram (J/g)

Methanol 1.0                          350                   350

Ethanol         1.0                          250                   250

Propane         1.0                          200                   200

Butane         1.0                          150                            150

Pentane         1.0                          100                            100

It is important to note that the results of this experiment are only a measure of the heat produced by the fuels.

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The term that refers to the passing of a wave through an object is "transmission."

Transmission refers to the process by which a wave passes through an object or medium. In the context of sound, transmission occurs when sound waves travel through different substances, such as air, water, or solids.

When a sound wave encounters an object, it can be transmitted through it, reflected off it, or absorbed by it, depending on the properties of the object and the medium through which the sound is traveling.

For example, when you speak into a microphone, the sound waves produced by your voice travel through the air and are transmitted to the microphone's diaphragm. The diaphragm converts the sound waves into electrical signals, which can then be amplified and reproduced as sound through speakers.

In summary, transmission is the term used to describe the passage of a wave, such as a sound wave, through an object or medium. It is an essential concept in understanding how waves interact with their surroundings and how sound propagates through different materials.

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Answer:

basically i not love chemistry lol

but my brother do...

Atkins Pyshical chemistry is right choice if you want to go deep

Answer:

X(HCO3)2 is X2(C2H2O6), so the total number of atoms for each element can be calculated:

2 X atoms

4 H atoms

6 C atoms

12 O atoms

Calculate the total atomic mass of the elements:

2 X atoms * atomic mass of X = 2X * atomic mass of X

4 H atoms * 1.0 amu = 4.0 amu

6 C atoms * 12.0 amu = 72.0 amu

12 O atoms * 16.0 amu = 192.0 amu

The molar mass of X(HCO3)2 is 162 g/mol, so the total atomic mass of the elements should add up to 162 g/mol:

2X * atomic mass of X + 4.0 amu + 72.0 amu + 192.0 amu = 162 g/mol

Solve for X by rearranging the equation:

2X * atomic mass of X = 162 g/mol - 4.0 amu - 72.0 amu - 192.0 amu = -12.0 amu

2X = -12.0 amu / atomic mass of X

Divide both sides by 2:

X = -6.0 amu / atomic mass of X

So the relative atomic mass of X is 6.0 amu.

The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ

First, we shall obtain the limiting reactant. Details below:

3H₂ + N₂ -> 2NH₃

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂

Therefore,

2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂

We can see that only 0.43 g of H₂ is needed in the reaction.

Thus, the limiting reactant is N₂

Finally, we the amount of heat energy produced. Details below:

3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ

From the balanced equation above,

When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.

Therefore,

When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ

Thus the heat energy produced from the reaction is -6.61 KJ

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The element with 20 protons has the atomic number of 20 and the element is calcium. The mass number if it contain 24 neutrons is 44. Hence the nuclear symbol of the ion is \(_{20}^{44}\textrm{Ca}\).

Calcium is 20th the element in periodic table and it is an alkali metal classified to s-block elements. The atomic number of an element is the number of its protons. For a neutral atom the number of electrons and protons are equal.

Calcium have 20 electrons and 20 protons. Hence the atomic number of Ca is 20. Mass number of an atom is the sum of number of number of protons and number of neutrons. Hence, mass number of calcium is 20 + 24 = 44. The nuclear symbol of Ca is thus \(_{20}^{44}\textrm{Ca}\).

An atom forms positive ions called cations when it loses electrons. When an atom gain electron it forms a negative ion called the anion. When Ca loses two electrons it forms Ca²⁺ ions. Hence, it is a cation and the number of electron in the ion is 20- 2= 18.

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Answer: All of them are true

Answer:

Plants and animals share the common process of respiration.

Respiration is the process by which organisms obtain energy from organic molecules and convert it into a usable form, such as ATP (adenosine triphosphate). While the specific mechanisms and molecules involved may differ between plants and animals, the overall process of respiration is essential for both.

In plants, respiration occurs in the mitochondria of cells, where organic molecules such as glucose are broken down through a series of biochemical reactions to release energy. This energy is then used for various cellular processes, including growth, reproduction, and maintenance.

In animals, respiration typically involves the intake of oxygen through respiratory systems, such as lungs or gills, and the exchange of gases with the external environment. Oxygen is transported to cells, where it is utilized in cellular respiration to break down organic molecules and release energy.

Overall, respiration is a fundamental process that allows both plants and animals to extract energy from nutrients and carry out essential life functions.

Explanation:

According to the solubility of  of sparingly soluble electrolytes by conductometer and potentiometer.

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.It can also be determined for electrolytes.

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Answer:

Hubble's law says that the universe is expanding outward.

Explanation:

Actually Hubble's law was discovered before the Big Bang theory was formulated. The Big Bang Theory is an attempt to explain the observations that led to Hubble's Law.Before the 1900s the theory was that the universe was eternal and self existent. The idea was that the universe was in a steady state having always existed and would always continue to exist. Albert Einstein even changed the equations in his general theory of relativity to reflect the idea of a steady state. Later he called putting in a fudge factor to result in a steady state the worse mistake of his life.

Hubble observed that most of the universe has a red shift indicating that the universe is expanding and moving away from itself. The further out that the universe is observed the faster it is moving apart.

These observations were inconsistent with a steady state universe.

The Big Bang theory extrapolated backwards. If the universe is expanding and spreading out from itself then further back in time the universe was closer together. The Theory explained Hubble's observations by the idea that at the beginning of time ( for our universe) all the matter and energy were together in one place.

This super dense ball of matter and energy then exploded outwards creating space and time as it is presently observed. The question was would the forces of gravity and black holes bring the matter and energy back together again. The answer found in 1998 was no. The rate of the expansion of the universe is increasing not slowing down and the universe will not collapse back into the super dense ball of matter that it began as.

The Big Bang Theory postulated based on the empirical evidence that our universe had a beginning and it will eventually cease to exist. The conclusion based on Hubble's observations is that matter and energy are not eternal and self existent.

Answer:

72.6% Error

Explanation:

% error = \(\frac{Real-Measured}{Real} * 100\)

\(\frac{58.44-16}{58.44} *100= 72.6\)

58.44 is the weight of NaCl

The type of energy transfer between the frozen ice cream and the tongue is convection. The frozen ice cream will gradually melt because of the temperature difference.

Convection is the method of heat transfer that involves the transmission of heat in a fluid (liquid or gas) by the circulation of currents.

According to this question, a spoonful of frozen ice cream is placed on the tongue. The heat transfer will occur between the tongue with warmer temperature and the ice cream with colder temperature.

The heat energy will flow from the tongue to the ice cream, hence, making it defreeze or melt with time. This type of heat transfer is convection because it involves a fluid.

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The synthesis of ch3oh(g) from co(g) and h2(g). The value of kc for the reaction at 483 k is 14.5. a 1.0 mol sample of co(g) and a 1.0 mol sample of h2 (g) are pumped into a rigid. [CH3OH] = 14.5 M is true at equilibrium.

The synthesis of CH3OH(g) from CO(g) and H2(g) is represented by the following equilibrium equation:

CO(g) + 2H2(g) <---> CH3OH(g)

The equilibrium constant (Kc) for this reaction at a temperature of 483 K is 14.5. This means that at equilibrium, the concentration of CH3OH(g) in the reaction vessel will be 14.5 times greater than the combined concentrations of CO(g) and H2(g). If a 1.0 mol sample of CO(g) and a 1.0 mol sample of H2(g) are pumped into a rigid, previously evacuated 2.0 L reaction vessel at 483 K, the initial concentrations of CO(g) and H2(g) will be 0.5 mol/L for each gas. The initial concentration of CH3OH(g) will be zero, as the reaction has not yet reached equilibrium. At equilibrium, the concentrations of CO(g), H2(g), and CH3OH(g) in the reaction vessel will be in a ratio of 1:2:1, as indicated by the coefficients in the equilibrium equation. The concentration of CH3OH(g) at equilibrium will be 14.5 times greater than the combined concentrations of CO(g) and H2(g), or 14.5 x (0.5 mol/L + 0.5 mol/L) = 14.5 x 1.0 mol/L = 14.5 mol/L.

Based on these calculations, the correct statement is:

(c) [CH3OH] = 14.5 M

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Answer:

87.6 %

Explanation:

Step 1: Write the balanced equation

LiOH + KCl ⇒ LiCl + KOH

Step 2: Calculate the theoretical yield of LiCl

We will use the following relations:

The theoretical yield of LiCl from 20.0 g of LiOH is:

\(20.0gLiOH \times \frac{1molLiOH}{23.95gLiOH} \times \frac{1molLiCl}{1molLiOH} \times \frac{42.39gLiCl}{1molLiCl} = 35.4gLiCl\)

Step 3: Calculate the percent yield of LiCl.

We will use the following expression.

\(\%yield = \frac{real\ yield}{theoretical\ yield} \times 100\% = \frac{31.0g}{35.4g} \times 100\% = 87.6 \%\)

Answer:

88.6%

Explanation:

Hello,

In this case, considering the given reaction, we notice a 1:1 molar relationship between lithium hydroxide (molar mass=23.95 g/mol) and lithium chloride (molar mass=42.394 g/mol), for that reason, we are able to compute the theoretical yield of lithium chloride by stoichiometry:

\(m_{LiCl}^{theoretical}=20.0gLiOH*\frac{1molLiOH}{23.95gLiOH}*\frac{1molLiCl}{1molLiOH} *\frac{42.394 gLiCl}{1molLiCl}=35.4gLiCl\)

Next, by knowing the actual yield of 31.0 g, we compute the percent yield as:

\(Y=\frac{m_{LiCl}^{actual}}{m_{LiCl}^{theoretical}} *100\%=\frac{31.0g}{35.4g}*100\%\\ \\Y=87.6\%\)

Therefore, among the given, the answer should be 88.6%

Best regards.

What causes the changes in the ice ages is when the earth's orbits tilts.

The ice ages are caused by changes in Earth's orbit and tilt, which affect the amount of solar radiation received by the planet. These changes alter the climate and trigger the growth and retreat of ice sheets.

We know that the changes in the climates is responsible for most of the changes that we can see in the universe as we have come to experience it today.

Thus the earth's orbits is what does control the changes in the ice ages.

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The equilibrium constant of the system can be obtained as  2.6.

We know that we have to obtain the equilibrium constant by setting up the ICE table of the reaction as we can see in the portion below and this is shown as;

           A    +    B ⇆          C

I       0.238     0.238          0

C    -x                -x               +x

E    0.238 - x   0.238 - x        0.072

At equilibrium, we would have;

[A] =  0.238 - 0.072

= 0.166

[B] = 0.238 - 0.072

= 0.166

Then;

K = [C]/[A] [B]

K = [0.072]/(0.166)^2

K = 2.6

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Answer:

40.27% Bromide in the original sample

Explanation:

The reaction of bromide ion, Br- with Pb(NO3)2 is:

2 Br- + Pb(NO3)2 → PbBr2(s)

Where the precipitate produced is PbBr2

To solve this question we must find the moles of PbBr2 filtered using its mass. Twice these moles we can find the moles of Br- and its mass. Percent bromide is:

Mass Bromide / Mass Sample (0.5014g) *100

Mass PbBr2:

1.7895g - 1.3258g = 0.4637g PbBr2

Moles -Molar mass: 367.01g/mol-

0.4637g PbBr2 * (1mol / 367.01g) =

0.001263 moles PbBr2 * (2mol Br / 1mol PbBr2) = 0.002527 moles Br

Mass Br -Molar mass: 79.904g/mol-

0.002527 moles Br * (79.904g / mol) =

0.2019g Br

Percent Bromide:

0.2019g Br / 0.5014g * 100 =

472.7ml of a .5500 M solution of NaI are needed to produce 34.81mg of I\(_2\) in the reaction COCl\(_2\)+2NaI  → 2NaCl+CO+I\(_2\).

A measurement of three-dimensional space is volume. Several imperial or US customary units, as well as SI-derived units (such the cubic meter and liter), are frequently used to quantify it quantitatively. Volume and length (cubed) have a symbiotic relationship.

COCl\(_2\)+2NaI  → 2NaCl+CO+I\(_2\)

number of moles of I\(_2\) =34.81/254=0.13moles

2 moles of NaI gives 1 moles of I\(_2\)

0.13moles are obtained by 2×0.13=0.26moles of NaI

0.550moles of I\(_2\) is present in 1000ml

0.26moles of I\(_2\) is present in (1000/0.55)×0.26=472.7ml

Therefore, 472.7ml of a .5500 M solution of NaI are needed to produce 34.81mg of I\(_2\).

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According to the research, levers are used to modify or generate a force and transmit displacement.

It is a simple machine composed of a rigid bar of some moderately resistant material, which rotates freely on a support point.

It can be used to maximize the mechanical force applied to an object, increasing its speed or the distance it travels, by applying a proportionally smaller amount of force.

Therefore, we can conclude that according to the research, levers are used to modify or generate a force and transmit displacement.

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The partial charges on each fluorine atom are negative. Option B) The central O atom is the correct answer. Option B

The partial charges in a molecule are determined by the electronegativity values of the atoms involved. Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond. In the case of \(F_2O\), fluorine (F) is more electronegative than oxygen.

Fluorine is the most electronegative element on the periodic table, meaning it has a high ability to attract electrons. Oxygen is also relatively electronegative but less so than fluorine. When fluorine atoms bond with oxygen, the shared electrons will be pulled more towards the fluorine atoms, creating a polar covalent bond.

In \(F_2O\), each fluorine atom will pull the shared electrons towards itself, resulting in a higher electron density around the fluorine atoms. This creates a region of partial negative charge around the fluorine atoms.

Conversely, the oxygen atom will have a region of lower electron density and, therefore, a partial positive charge. This is because the shared electrons spend more time around the fluorine atoms due to their higher electronegativity.

Option B

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\(\\ \sf\longmapsto PV=nRT\)

\(\\ \sf\longmapsto 4.67(2)=0.66(8.314)T\)

\(\\ \sf\longmapsto 9.34=5.48T\)

\(\\ \sf\longmapsto T=1.7°C\)

Key words

Answer:

from the ideal gas law, P2 /P1 = T2 /T1 for the same volume and quantity of gas. P2 = (758 mmHg) (45 +273 K) / (15 +273K) = 837 mmHg.

Explanation:

Answer:

0.15 g of CuSO4.

Explanation:

What is given?

Concentration of CuSO4 = 0.00095 mol/L.

Liters of solution = 1 L.

RAM (Cu) = 63.

RAM (S) = 32.

RAM (O) = 16.

Step-by-step solution:

Let's see the formula of molarity (concentration of solution):

And we want to find the moles of solute to calculate the weight of copper sulfate. The statement is telling us that we're going to use 1 liter of solution, so let's solve for 'moles of solute' and replace the given data (molarity of CuSO4 solution = concentration of CuSO4 = 0.00095 mol/L and liters of solution = 1L):

Now, we have to convert 0.00095 moles of CuSO4 to mass and here we're going to use the RAM (relative atomic mass)

First, let's calculate the RAM of CuSO4 by doing an algebraic sum with the given RAMs. You can see that we have 1 Cu, 1 S, and 4 O, so the calculation will look like this:

The RAM of CuSO4 is 159. The value of RAM is equivalent to molar mass, but the difference is that the molar mass has the units of g/mol, so, in this case, the molar mass of CuSO4 is 159 g/mol. So now, the conversion from moles to grams will be:

The answer is that they have to weigh out 0.15 g of CuSO4.

Answer:

1.92704e24 atoms

Explanation:

Using Avogadro's number, you can set up a stoichiometric equation to find the number of atoms.

There are 1.926 × 10²⁴ atoms in 3.2 moles of sulfur (S).

The number of atoms in a substance can be calculated by multiplying the number of moles by Avogadro's number.

Avogadro's number is the number of atoms present in 12 grams of isotopically pure carbon-12, being 6.02214076 × 10²³.

According to this question, there are 3.2 moles of sulfur. The number of atoms can be calculated as follows:

no of atoms = 6.02 × 10²³ × 3.2

no of atoms = 19.26 × 10²³

no of atoms = 1.926 × 10²⁴

Therefore, 1.926 × 10²⁴ atoms are in 3.2 moles of sulfur.

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Answer:

C. grazing, mining, developing oil and gas.

Explanation:

The Bureau of Land Management's mission is to sustain the health, diversity, and productivity of public lands for the use and enjoyment of present and future generations.

Hope it helps.

Grazing, mining, developing oil and gas are the three land uses that the Bureau of Land Management was originally created to manage.

Hence, we can conclude that option C is the answer.

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