How can the total energy of an open system be changed? Enter your answer in the space provided.

Answer:

A population is a group of organisms belonging to the same species that live in the same area and interact with one another.

Explanation:

Levels of Ecological Organization

Level # 2. Population:

Level # 3. Community:

Level # 4. Ecosystem:

Level # 5. Biome:

Level # 6. Biosphere:

Answer: hope this helps!

Explanation:

Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance. Therefore,  the enthalpy of reaction is -2219.9KJ/mol and the reaction is exothermic reaction.

Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances.

Mathematically,

C[tex]_3[/tex]H[tex]_8[/tex](g) + 5O[tex]_2[/tex](g) [tex]\rightarrow[/tex]3CO[tex]_2[/tex](g) + 4H[tex]_2[/tex]O(g)

Mathematically, the formula for enthalpy of a reaction can be given as

ΔH for reaction= 3 ×ΔH of CO[tex]_2[/tex] + 4  ×ΔH of H[tex]_2[/tex]O- ΔH of  C[tex]_3[/tex]H[tex]_8[/tex]+ 5 ×ΔH of O[tex]_2[/tex]

                        =  3 ×393.5KJ/mol+ 4  ×285.8- 103.8+ 5 ×0

                        =-2219.9KJ/mol

The  enthalpy of reaction is -2219.9KJ/mol. since the value of enthalpy has negative sign, the reaction is exothermic reaction.

Therefore,  the enthalpy of reaction is -2219.9KJ/mol and the reaction is exothermic reaction.

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Answer:

I believe D is the best answer choice.

Explanation:

C is also a good answer but I feel like D most accurately describes the scientific method.

Answer:

C

Explanation:

its true and contains more academic words and i got it right

The hydronium ion concentration [H₃O⁺]=7.826 x 10⁻⁶

In general, the weak acid ionization reaction  

HA (aq) ---> H⁺ (aq) + A⁻ (aq)  

Ka's value  

[tex]\large {\boxed {\bold {Ka \: = \: \frac {[H ^ +] [A ^ -]} {[HA]}}}}[/tex]

Reaction

HCN(aq) + H₂O(l) ⇌ H₃O⁺(aq) + CN⁻ (aq)

0.125

x                                   x               x

0.125-x                         x               x

[tex]\tt Ka=\dfrac{[H_3O^+][CN^-]}{[HCN^-]}[/tex]

[tex]\tt 4.9\times 10^{-10}=\dfrac{x^2}{0.125-x}\approx \dfrac{x^2}{0.125}\\\\x^2=6.125\times 10^{-11}\\\\x=7.826\times 10^{-6}[/tex]

The energy related to the change of state represented by the model is  atoms gain energy as a solid changes to a liquid. Thus option A is correct.

Energy is defined as the quantitative property that is imparted to a body or a physical system and is visible in the performance of work as well as in the form of heat and light.

It can also be defined as ability to perform work.

There are basically nine types of energy:

There are two more forms of energy.

In terms of atomic randomness, the gas contains atoms with extremely high kinetic energies. Atoms in the solid are only vibrating where they should be. As a result, for a gas to become a solid, some energy must be lost within the atom.

Thus, the energy related to the change of state represented by the model is  atoms gain energy as a solid changes to a liquid. Thus option A is correct.

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Answer: Option A

Explanation: took the test

Answer:

[tex]V_2=35.68\ L[/tex]

Explanation:

Initial volume, V₁ = 300 L

Temperature, T₁ = 227°C

New temperature, T₂ =  27°C

We need to find the volume of gas occupied when the temperature is 27°C.

It is based on Charle's law. A/c to Charle's law,

[tex]V\propto T[/tex] (at constant pressure)

[tex]\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}\\\\V_2=\dfrac{V_1T_2}{T_1}\\\\V_2=\dfrac{300\times 27}{227}\\\\V_2=35.68\ L[/tex]

Hence, the new volume is 35.68 L.

Answer:

124.56 moles of Hydrogen atoms.

Explanation:

We'll begin by calculating the number of moles of ethane that contains 1.25×10²⁵ molecules. This can be obtained as follow:

From Avogadro's hypothesis, 1 mole of any substance contains 6.02x10²³ molecules. This implies that 1 mole of ethane also contains 6.02x10²³ molecules.

Thus, 6.02x10²³ molecules are present in 1 mole of ethane.

Therefore, 1.25×10²⁵ molecules are present in = 1.25×10²⁵/6.02x10²³ = 20.76

Therefore, 20.76 moles of ethane contains 1.25×10²⁵ molecules.

Finally, we shall determine the number of mole of Hydrogen in 20.76 moles of ethane. This can be obtained as follow:

Ethane has formula as C2H6.

From the formula, 1 mole of ethane, C2H6 contains 6 moles of Hydrogen atoms.

Therefore, 20.76 moles of ethane will contain = 20.76 × 6 = 124.56 moles of Hydrogen atoms.

Therefore, 1.25×10²⁵ molecules of ethane contains 124.56 moles of Hydrogen atoms.

Explanation:

its light waves cannot travel through vaccum

hope it helps

Answer:

Transverse waves do not require a medium to travel.

Explanation:

Answer:

It indicates phase changes: melting then  later boiling.

Explanation:

On the heating curve of water, the plateau marks phase change transitions.The temperature remains constant during this period.The first phase change is melting of water.The second phase change is boiling of water to gas.

Answer:

Noble gas, any of the seven chemical elements that make up Group 18 (VIIIa) of the periodic table. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og).

Explanation:

I pretty much covered it in my answer!

Pls Brainliest! It would mean a lot! ;)

Answer:

2.08g

Explanation:

Given parameters:

  Volume of CuSO₄  = 3.29mL

  Molarity  = 4M

Unknown:

Mass of CuSO₄ = ?

Solution:

Let us find the number of moles from the given parameters first;

     Number of moles  = molarity x volume

           1000mL = 1L

Express the volume of the given CuSO₄ in L = 3.29 x 10⁻³L

   Number of moles  = 4 x 3.29 x 10⁻³ = 0.013mol

So;

  Mass of CuSO₄ = number of moles x molar mass

      Molar mass of  CuSO₄  = 63.6 + 32 + 4(16) = 159.6g/mol

 Mass of CuSO₄  = 0.013mol  x 159.6g/mol

 Mass of CuSO₄  = 2.08g

Answer:

protons and neutrons so A and C

Answer:The maximum kinetic energy KEe of ejected electrons (photoelectrons) is given by KEe=hf−BE KE e = h f − BE , where hf is the photon energy and BE is the binding energy (or work function) of the electron to the particular material.

Explanation:

The maximum kinetic energy of an ejected electron if silver metal is irradiated with 224 nm light is 4.66eV.

Kinetic energy is defined as is a form of energy that an object and particle has by the reason of its movement.

It is also defined as the measure of the work that an object does by the virtue of its motion.

Kinetic energy can be expressed as

KE = 1/2 mv²

KE = hc / ∧

KE = 6.63 x 10⁻³⁴ x 3 x 10⁸ / 267

KE = 7.45 x 10⁻¹⁹ J

The charge on electrons 1.6 x 10⁻¹⁹ C

So, Maximum kinetic energy = 7.45 x 10⁻¹⁹ / 1.6 x 10⁻¹⁹

                                                = 4.66 eV

Thus, the maximum kinetic energy of an ejected electron if silver metal is irradiated with 224 nm light is 4.66eV.

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Answer:

its b

Explanation:

Answer:

The process of turning water into gas is called evaporation. When water is heated, it changes state from a liquid to a solid. No mass is destroyed during the process, but rather, it is converted into gas.

Explanation:

Brainliest Plzzz!!!

Answer:

no

their made from the earth

Answer:

water freezing

Explanation:

i think so

Answer:

Loss of muscle mass because there is no weight on the back and legs.

Explanation:

Answer:

Any element placed in a flame will change its color. Atoms are made of positively charged nuclei, about which negatively charged electrons move according to the laws of quantum mechanics. Quantum mechanics constrains them to appear in various distinct patterns, called orbitals. (Orbitals are a lot like planetary orbits, but blurrier, so that you're never quite sure just where the electrons are.)

Left on their own, the electrons of an atom tend to relax into orbitals that leave the atom with the lowest possible energy--its ground state. Putting atoms into a flame, though, adds energy to the looser electrons farthest from the nucleus and pushes them into other orbitals. Eventually, these excited electrons drop back to where they ought to be, and in so doing, they release the energy they stored up as particles of light, called photons.

Explanation:

Answer:

cell membrane is the answer

Answer: cell membrane

Explanation:

Explanation:

de Broglie wavelength= h/mv

v=h/m x de Broglie wavelength

v= (6.626× 10^-34)/ (2347× 1.27 × 10^-38)

v= 22.229 m/s(according to Google scientific calculator)

am sorry I don't hv a calculator at hand

Answer:

it should be B. earths core is composed of iron and nickel, if not let me know.

Answer: B. Earth's core is composed of iron and nickel.

Explanation: The inner core is solid so C and D are incorrect and A is incorrect because the core isn't made of magnets so it has to be B.

Answer: it has one proton and electron

Explanation:

Answer:

Salty water

Explanation:

Sorry for wasting your time.

Answer:

The climate of any particular place is influenced by a host of interacting factors. These include latitude, elevation, nearby water, ocean currents, topography, vegetation, and prevailing winds.

Explanation:

those are what does not affect climate

Answer: the electric charge

Explanation:

Hello sir, The answer that you are looking for is fluorine. Fluorine is the most electronegative atom. I am also sorry for calling you sir. I didn't know you were a woman.

Answer:

i cry when im alone

Explanation: