Which things from the image make up the pond community?
A.
water, rocks, clouds, and air only
B. fish, ducks, turtles, frogs, crayfish, and insects only
grasses, cattail reeds, fish, ducks, turtles, frogs, crayfish, and insects.
D.
grasses, cattail reeds, water, rocks, clouds, air, fish, ducks, turtles, frogs, crayfish, and insects.

A chemical change occurs when there is a bond breaking or bond making. A phase change, change in phase and or change in shape does not make a chemical change. A chemical change can be indicated by the heat given off by a reaction or change. Thus, option a is correct.

There are broadly two types of change occurs for a substance namely chemical change or physical change. A physical change is a change in state or phase involves no formation products or breaking of bonds. For example melting of a solid to liquid and boiling of liquid to gas etc.

In a chemical change there makes a bond breaking or making to form a new product. All chemical reactions such as combination reactions, decomposition, displacements etc. are chemical changes.

Every chemical change is associated with an enthalpy of heat energy that is absorbed or released by the system. Thus heat given off is an indication of a chemical change. Hence, option A is correct.

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Atoms of a substance gain kinetic energy, when thermal energy is applied to it. Therefore, option B is correct.

When thermal energy is applied to a molecule, it increases the kinetic energy of the molecule. Thermal energy refers to the total energy associated with the random motion of particles within a substance.

The relationship between temperature and the average kinetic energy of a molecule is described by the kinetic theory of gases.

As thermal energy is added to a system, the average kinetic energy of the molecules increases. This happens because the energy is transferred to the molecules through collisions between them. Therefore, option B (atoms gain kinetic energy) is correct.

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Answer ;

Your answer is C

Explanation:

Answer:

The Biosphere is the part of the earth where life exists.

Biosphere is all organisms on Earth for example plants animals and microoganisms.

Explanation:

Answer:

Explanation:

what do u need to know

The atoms of elements in the same group or family have similar properties because they have the same number of valence electrons.

Valence electrons are the electrons in the outermost energy level of an atom. They are responsible for the chemical behavior of an element. Elements in the same group or family have the same number of valence electrons, which means they have similar chemical behavior.

For example, elements in Group 1, also known as the alkali metals, all have 1 valence electron. This gives them similar properties such as being highly reactive and having a tendency to lose that electron to form a positive ion.

In contrast, elements in Group 18, also known as the noble gases, all have 8 valence electrons (except for helium, which has 2). This makes them stable and unreactive because their valence shell is already filled.

So, the similar properties of elements in the same group or family can be attributed to their similar number of valence electrons.

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A phase diagram is a plot of temperature on the x-axis vs. pressure on the y-axis.

This diagram shows the stable regions for each phase of matter (solid, liquid, gas) and the conditions under which these phases may exist in equilibrium.

A phase diagram is a graphical representation that illustrates the relationship between temperature, pressure, and the phases of a substance. The x-axis of the phase diagram represents temperature, usually in degrees Celsius or Kelvin, while the y-axis represents pressure, typically in units like atmospheres or kilopascals.

The phase diagram outlines the different regions or regions where each phase of matter (solid, liquid, or gas) is stable under specific temperature and pressure conditions. The boundaries between these regions represent phase transitions, such as melting, boiling, or sublimation.

By examining a phase diagram, one can determine the conditions at which a substance exists in a particular phase and the conditions required for phase transitions to occur. The phase diagram provides valuable information about the behavior and stability of substances under different temperature and pressure conditions.

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ANSWER

Option C

EXPLANATION

Given that;

In the reaction above, we have the following data

At the reactants side;

3 atoms of manganese

4 atoms of nitrogen

1 atom of sodium

1 atom of fluorine

At the products side

1 atom of manganese

4 atoms of fluorine

3 atoms of sodium

1 atom of nitrogen

To balance the above equation, apply the law of conservation mass

Law of conservation of mass states that matter can neither be created nor destroyed but can e transformed from one formato another.

To balance the equation, 1 mole of Mn3N4 reacts with 12 moles of Na Tto give 3 moles of MnF4 and 4 moles of Na3N

So, the new equation becomes

The following data can be deduced in the above equation

At the reactants side

3 atoms of Mn

4 atoms of N

12 atoms of Na

12 atoms of F

At the products side

3 atoms of Mn

12 atoms of F

12 atoms of Na

4 atoms of N

Looking atthe vabove data, the number of atoms of each element at the reactants side is equal to the number of atoms of same elements at the products side.

Hence, the correct answer is option Ce

u

Answer:

a compound is a syllable in the outer world

Explanation:

The balanced equation for the reaction between hydrogen and oxygen to form water is:

2H2 + O2 -> 2H2O

To react 4 moles of hydrogen with 3 moles of oxygen, we will also need 1.5 moles of oxygen.

Since we have enough hydrogen and not enough oxygen to react completely, we can calculate the theoretical yield of water produced.

4 moles of H2 will react to produce 2 moles of H2O and 1.5 moles of O2 will react to produce 0.75 moles of H2O. Therefore, the total theoretical amount of water produced is 2 + 0.75 = 2.75 moles of water.

percent yield = (actual yield / theoretical yield) x 100

percent yield = (3 / 2.75) x 100 = 109.09%.

So the percent yield is 109.09%. This means that 109.09% of the theoretical yield was actually produced, and the reaction was more efficient than expected.

It's worth noting that percent yield can't be more than 100% because it implies that more than the theoretical amount of product was produced, which is not possible. In this case, the percent yield is not a realistic value, therefore, the actual yield and the theoretical yield should be rechecked.

The product of electrolysis : Al at cathode and Cl₂(chlorine) at anode

Given

Aluminum chloride compound

Required

The product of electrolysis

Solution

The rule :

The reaction at the cathode(the negative pole) :

1. the reduced active metal is water, other than that the metal will be reduced

2. H⁺ of the acid will be reduced

The reaction at the anode((the positive pole) :

1. if the electrodes are not inert then the metal is oxidized

2. If inert then:

a. OH⁻ from the base will be oxidized

b. The halogen metal will oxidize

In the electrolysis of molten AlCl₃ with an inert electrode, the cation will be reduced at the cathode and the anion will be oxidized at the anode

Cathode : Al³⁺ + 3e⁻ ⇒ Al(s)

Anode : 2Cl⁻⇒Cl₂(g) + 2e⁻

Answer:

D

Explanation:

D

Answer:D. Increased sales compared to research and development time and cost of materials

Explanation:

This problem is describing a mixture composed by diethyl ether and actic acid, in which it is desired to extract the latter somehow.

In this case, it turns out relevant to recall the concept of polarity, hydrogen bonds, and, in general, intermolecular forces. Acetic acid is a highly polar compound, able to have both dipole and hydrogen-bonding interactions, which are by far stronger than nonpolar-based London dispersion forces.

In such a way, since diethyl ether and actic acid are able to interact via dipole-dipole interactions, they latter is able to be dissolved in the former; however, when it is desired to extract the acid, it would be necessary to add a substance able to form H-bonds with acetic acid, which are stronger than the dipole interactions.

Therefore, the best solvent for this extraction will be water due to its higher polarity and superior capacity to form H-bonds.

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Yes, the number of different colors used on a form should be limited to three colors, exclusive of black (K), white (W), and gray (G).

When designing a form, it is generally recommended to keep the color scheme simple and limited. Using too many colors can create visual clutter and make the form harder to read and understand. By restricting the number of colors to three (excluding black, white, and gray), you can maintain a clean and cohesive design.

Black, white, and gray are considered neutral colors that are often used for text, backgrounds, or borders. By excluding them from the count of different colors, you ensure that you have three additional colors for highlighting important information, indicating sections, or adding visual interest.

This limited color palette helps create a visually balanced form that is both aesthetically pleasing and functional, making it easier for users to navigate and complete the form.

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Molecular sieves will lose their functionality if left open for a long period because they will absorb the water in the air. A material is employed, it must be able to fulfil its purpose or primary functions effectively.

In the experiment, we investigate the effect of leaving molecular sieves uncapped for a prolonged period of time on their functioning. The molecular sieves would absorb the water in the air, hence reducing their ability to absorb.

A substance with uniformly sized pores primary functions called a molecular sieve. Due to the same size of these pore widths to small molecules are primary functions , larger molecules cannot enter or be adsorbed but smaller molecules can.

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Answer:

relatable a.f                        

Explanation:

Answer:

Thank you for free point :)

Explanation:

Answer:

atoms have same atomic number but different atomic masses is called isotopes

Explanation:

Answer:

Ionization energy : energy required to take out an electron from the valance orbital of an atom.

Electron affinity: electron affinity of an atom measures the amount of energy released when an electron is forcibly entered or pushed into the valence orbital of an atom.

Ionization energy is the energy required to make an atom into a positive ion. Electron affinity is the energy released when an atom becomes a negative ion.

ionization energy is what is required to remove one electron from a normal gaseous atom to produce a +1 anion of that atom.

electron affinity is the energy required to remove one electron from a gaseous -1 anion of an atom to produce a normal gaseous atom.

Answer:

B. Hess's law states that the enthalpy of a reaction does not depend

on the reaction path.

Explanation:

Answer:

The correct answer would be D) chlorophylls.

Explanation:

Chlorophyll refers to the green pigment present in cyanobacteria and chloroplasts of plants and algae. It is the pigment which is able to absorb light which makes it an essential element for photosynthesis.

Answer:

504 grams

Explanation:

2.56 moles of gold can be converted using molar mass

Molar mass of Au (gold) = 197.0

You convert moles to grams by multiplying number of moles by number of grams.

2.56 x 197.0 = 504 (accounting for correct number of significant digits)

The mass of 2.56 mol of gold is 504.24 g.

The mass of 2.56 mol of gold can be determined by using the formula:

mass = number of moles × molar mass

The molar mass of gold (Au) is 196.97 grams per mole (g/mol). We can find this information in the periodic table of the chemical elements, specifically in group IB and in period 6 where gold is located.

Therefore, the mass of 2.56 mol of gold is:
mass = 2.56 mol × 196.97 g/mol
mass = 504.24 g

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Answer:

Copper Sulphate

Explanation:

Cu (Copper)

SO4 (Sulphate)

Answer:

True

Explanation:

Birds are characterized by the presence of certain physical features that are unique to the group and serve to distinguish birds from other animal groups. These features, such as feathers, a beak instead of teeth, a lightweight skeleton, and the ability to fly, are considered the defining characteristics of birds. These defining characteristics serve as the basis for classifying birds as a distinct group and are used by scientists to identify and study different bird species.

The continuation of the electron configuration is 3p6 4s2 3d3.

Electronic configuration ends up with = 3p4

So, here principle quantum number(n) =3

Atom which ends up with 3p4 configuration = S

Sulphur(s) = [Ne] 3s2 3p4

So atomic number of Sulphur (s) =16

After adding 7e in it -

Atomic number = 16+7 =23

Now atomic no. =23 (after adding 7 more electrons)

So electronic configuration with atomic no. =23

Atomic number (23) - [Ne] 3s2 3p6 4s2 3d3

Now electronic configuration will ends up with= 3d3

Electrons belong to the primary technology of the lepton particle's own family and are typically thought to be fundamental particles because they have no recognized additives  substructure.

For most realistic purposes, an electron is a structureless particle with an intrinsic angular momentum or spin. simply two numbers — the electron's mass and its electric price — gasoline the equations that describe its behavior. From this 'sensible electron' version, physicists constructed present-day microelectronics.

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The total pressure is the sum of the partial pressures:

P_total = 100 torr + 200 torr = 300 torr

The initial pressures of H2 and N2 are 500 torr and 200 torr, respectively.

When the stopcock is opened, the gases will mix and reach equilibrium at constant temperature and volume.

Since the volume is constant and there is no chemical reaction between the gases, we can apply Dalton's law of partial pressures, which states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the individual gases.

Let x be the final partial pressure of H2 (in torr) after the stopcock is opened. Then, the final partial pressure of N2 will be (300 - x) torr, since the total pressure is 300 torr.

Using the partial pressure of H2, we can set up an equation for the total pressure in terms of x:

x + (200 - x) = P_total

Simplifying the equation, we get:

x + 200 - x = 300

x = 100

Therefore, the final partial pressure of H2 is 100 torr, and the final partial pressure of N2 is 200 torr. The total pressure is the sum of the partial pressures:

P_total = 100 torr + 200 torr = 300 torr

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When encountering a temperature inversion after takeoff, you should expect changes in atmospheric conditions, such as a decrease in temperature with increasing altitude instead of the usual temperature increase.

This can lead to challenges in aircraft performance and may require adjustments in flight operations. A temperature inversion refers to a deviation from the typical atmospheric temperature pattern where temperature decreases with increasing altitude. In a standard atmosphere, the temperature usually decreases by about 2 degrees Celsius per 1,000 feet of altitude gain. However, in a temperature inversion, there is a reversal of this pattern, resulting in a layer of warmer air above cooler air.

Encountering a temperature inversion after takeoff can have several implications for aircraft operations. Firstly, the inversion layer acts as a boundary that can affect the performance of the aircraft. It can cause changes in air density, which may result in alterations to lift and drag forces. These changes can impact aircraft stability, climb performance, and fuel efficiency.

Secondly, a temperature inversion can lead to the formation of fog or low-level clouds within the inversion layer. Moisture present in the cooler air below the inversion may condense as it comes into contact with the warmer air above. This can reduce visibility and pose challenges for navigation.

In such situations, pilots need to be aware of the temperature inversion and its effects on aircraft performance. They may need to adjust their flight operations, such as modifying climb rates or considering alternate routes to avoid adverse conditions. Communicating with air traffic control and staying informed about weather updates can help pilots make informed decisions and ensure a safe flight.

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The concept that each one matter is made up of tiny units called atoms was first proposed by Leucippus and Democritus, within the fifth century B.C. Dalton , in 1808 postulated that matter is formed of atoms, which are small indivisible particles

The atomic theory of matter was first proposed by Dalton in 1808. Dalton atomic theory regarded the atom because the ultimate particle of matter.

In 1898, J.J Thomson, proposed that an atom possess a spherical shape during which positive charge is distributed uniformly and the electrons are embedded into it. So his model is named plum pudding model

Rutherford established his model in 1900. He found that, most space of an atom is empty and charged particle concentrated at the center of an atom called nucleus.

In 1913, Neils Bohr improved the model proposed by Rutherford. consistent with his concept electrons orbit the nucleus.

Erwin Schrödinger, in 1926 proposed electron cloud model. He explains the probability of finding electrons.

Hence, we will conclude that the order the sequence of ideas that led to the current model of the atom is,

1. Dalton developed the idea that all matter is made of atoms.

2. Thomson discovered that atoms contain electrons.

3. Rutherford discovered that atoms have a nucleus.

4. Bohr developed the model during which electrons orbit the nucleus.

5. Schrödinger developed the electron cloud model of the atom.

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Answer:

When a body covers equal distances in a straight line, equal intervals of time are called uniform motion

When a body covers unequal distance in equal intervals of time in a straight line is called non-uniform

Answer:

Uniform motion- is motion in which the

velocity does not change.

Non-uniform motion-occurs when the velocity of an object is not

constant : the object speeds up or slows down during its motion, or changes direction.

Hope it will help you !!

a) The sphere emits thermal radiation at a rate of 139.75 Watts.

b) The sphere absorbs thermal radiation at a rate of 37.66 Watts.

c) The sphere's net rate of energy exchange is 102.09 Watts.

To calculate the rates of thermal radiation emission and absorption, we can use the Stefan-Boltzmann law, which states that the rate of thermal radiation emitted or absorbed by an object is proportional to its surface area, temperature, and the Stefan-Boltzmann constant.

a) The rate of thermal radiation emitted by the sphere can be calculated using the formula:

Emitting Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(temperature^4 - environment\ temperature^4\))

Plugging in the given values:

Emitting Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((32.2 + 273.15)^4 - (82.9 + 273.15)^4)\)

Emitting Rate ≈ 139.75 Watts

b) The rate of thermal radiation absorbed by the sphere can be calculated in a similar way but using the environment temperature as the object's temperature:

Absorbing Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(environment\ temperature^4 - temperature^4\))

Plugging in the given values:

Absorbing Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((82.9 + 273.15)^4 - (32.2 + 273.15)^4)\)

Absorbing Rate ≈ 37.66 Watts

c) The net rate of energy exchange is the difference between the emitting rate and the absorbing rate:

Net Rate = Emitting Rate - Absorbing Rate

Net Rate = 139.75 Watts - 37.66 Watts

Net Rate ≈ 102.09 Watts

Therefore, the sphere emits thermal radiation at a rate of 139.75 Watts, absorbs thermal radiation at a rate of 37.66 Watts, and has a net rate of energy exchange of 102.09 Watts.

Note: The units for all the rates are Watts.

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This is a perfect answer

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