Which arrow or arrows represent reactions that demonstrate a conservation of mass and energy? Explain your answer.

Answer:

the force resisting motion. it slows things down

Answer:

19.3

Explanation:

V=4^3 a^3,  to find volume with sides

p= 1235/64, Mass/ Volume= Density

Dependent variables could be height, number of leaves, biomass, etc. The constants could be the amount of water fed to the plants and other environmental conditions apart from the temperature.

Experimental variables could be independent, dependent, or constant.

Independent variables are supplied by the researcher and are often varied or manipulated to produce different effects on experimental systems or subjects.

Dependent variables are measured. Their values are often affected by whatever independent variable the researcher supplies.

Constant variables are uniform throughout the experimental groups or subjects.

Thus, in this case, the aim is to test the effect of temperature on the growth of a plant. The independent variable is the different temperatures.

The dependent variable would be any feature of the experimental plants that indicate growth. It could the height, the number of leaves, etc.

The constant variable would be other conditions the experimental plants are subjected to.

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Answer:

Aluminium is ordinarily classified as a metal. It is lustrous, malleable and ductile, and has high electrical and thermal conductivity. Like most metals, it has a close-packed crystalline structure and forms a cation in an aqueous solution.

Helium noble gas electron structures do the atoms in a molecule of hydrogen chloride attain

Noble gas any of a group of rare gases that include helium, neon, argon, krypton, xenon, and usually radon and that exhibit great stability and extremely low reaction rates

The reason that the two chlorine atoms stick together is that the shared pair of electrons is attracted to the nucleus of both chlorine atoms and hydrogen atoms only need two electrons in their outer level to reach the noble gas structure of helium

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Answer: The specific heat of the Al is \(1.008J/g^0C\).

Explanation:

\(Q_{absorbed}=Q_{released}\)

As we know that,  

\(Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})\)

\(m_1\times c\times (T_{final}-T_1)=-[m_2\times c\times (T_{final}-T_2)]\)      

where,

\(m_1\) = mass of water = 87.4 g

\(m_2\) = mass of Al metal = 6.7797 g

\(T_{final}\) = final temperature = \(28.67^0C\)

\(T_1\) = temperature of water = \(25.37^oC\)

\(T_2\) = temperature of Al metal = \(205.24^oC\)

\(c_1\) = specific heat of water = \(4.184J/g^0C\)

\(c_2\) = specific heat of Al metal = ?

Now put all the given values in equation (1), we get

\(m_1\times c_1\times (T_{final}-T_1)=-[m_2\times c_2\times (T_{final}-T_2)]\)

\(87.4\times 4.184\times (28.67-25.37)^0C=-[6.7797\times c_2\times (28.67-205.24)]\)

\(c_2=1.008J/g^0C\)

Therefore, the specific heat of the Al is \(1.008J/g^0C\).

279.448 kJ/mol is ΔH∘(rxn) for the given reaction. An attribute or state function that mimics energy is enthalpy.

The entire internal energy of a thermodynamic system is known as enthalpy, which is also known as the volume-to-pressure ratio. It has the same dimensions as energy and therefore can be expressed in joules or ergs. The value of enthalpy is solely dependent on the pressure, temperature, and chemical makeup of the system, not on its history.

Cr\(_2\)O\(_3\)(s)= -1128.4 kJ/mol

CO (g)=-110.525 kJ/mol

Cr (s)=0 kJ/mol

CO\(_2\) (g)=-393.509 kJ/mol

ΔH∘(rxn) = ΔH∘(products) - ΔH∘(reactants)

ΔH∘(rxn) = ΔH∘(products) - ΔH∘(reactants)

(2×0) + (3×-393.509) = -1,180.527 kJ/mol=ΔH∘(products)

(1×-1128.4) + (3×-110.525) = -1,459.975 kJ/mol=ΔH∘(reactants)

ΔH∘(rxn) = -1,180.527 - (-1,459.975) = 279.448 kJ/mol

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Answer:

C. size; direction

Explanation:

By definition, a machine is referred to any device that makes work easier. It takes force to do work, hence, work refers to the application of force over a particular distance. A machine aims at making the work easy by changing how it is done. Simple machines, which include: levers, pulleys, inclined planes etc. all carry out the same thing, which is to make work easier, by changing the size/magnitude and direction of the applied force.

A simple machine tends to change the size of the inputted force by increasing it over a shorter distance. The machine increases the force applied better than it can be done manually e.g. a plier and nutcracker increases/changes the applied force better than it can be done with bare hands.

Also, a simple machine can achieve making work easier by changing the direction at which the force is applied. The machine applies the force on the object in an opposite direction or contrary to the way it was manually applied.

Answer: Science : Chemistry, astronomy , biology , physics , biology ,geology. Notscience : Astrology and theology

Explanation: Astrology and theology are non scientific areas of study.

Explanation : số mol glucose 3.8M là :

n = Cm . V = 3.8 . 25 =95

=> Cm khi pha loãng = \(\frac{n}{V}\) = \(\frac{95}{250}\) = 0.38M

According to molar concentration, the  concentration of a solution formed by diluting 25.0 ml of a 3.8 M glucose solution to 250 ml is 0.38 M.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.In case of 2 solutions given it is calculated as M₁V₁=M₂V₂,on substitution, M₂=3.8×25/250=0.38 M.

Thus,  the  concentration of a solution formed by diluting 25.0 ml of a 3.8 M glucose solution to 250 ml is 0.38 M.

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Answer:

blood- homogeneous

ocean water - heterogeneous

air- homogeneous

blueberry pancakes - homogeneous

milk - homogeneous

steel - homogeneous

Answer:

5.004

Explanation:

............

............

.my Rude g ubddvbrbrbr

sorry in a hurry

Answer: 0.6

Explanation:Yes

Answer:

A. an observation

Explanation:

Because by saying that the leaf is green that is an observation on the leaf to tell what color it is.

Have a nice day/night :)

Answer:

i belive the answer is A if it's not i am very sorry

Explanation:

(1) The given equation is :

2(x + 3)=5x + 6 - 3x

Solving LHS first.

2(x + 3) = 2x +6

Solving RHS

5x + 6 - 3x  = 2x+6

LHS = RHS

So, it is always true.

(2) The given equation is :

x - 3=2x - 3 - x

LHS = x - 3

Solving RHS

2x - 3 - x = x-3

LHS = RHS

So, it is always true.

According to the Nerst equation, when Ecell = 0 then : A) Q = K, the nerst equation is then :

log Keq = (n E°) / (0.0592 V)

The Nerst equation is given as follows :

E cell = E°cell  - (0.0592 V / n ) log Q

the electrical potential of the cell is depend on the Q, that reaction quotient of the reaction. at equilibrium ΔG = 0 . the reaction quotient    Q = K and from the equation , ΔG = -nFE , ans E = 0, now the nerst equation is given as :

0 = E° - ( RT / nF ) ln K

0 = E° - ( 0.0592 V / n) log K

log K = (n E°) / (0.0592 V)

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By tripling the temperature, the pressure of a gas will also triple because of its direct relationship.

The pressure of a given gas is directly proportional to its absolute temperature while the volume does not change. The volume of a given gas is directly proportional to its absolute temperature in the presence of constant pressure according to Charles's law.

The pressure law states that the temperature of the gas is directly proportional to its pressure when the constant volume of gas is present in a container. This can be easily understood by seeing the particles of gas in the container that moves with a greater energy when the temperature of a gas is increased.

So we can conclude that there is direct relationship between pressure and temperature.

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Answer:

NaCl

Explanation:

Na is the symbol of sodium. Cl is the symbol of chlorine

The empirical formula of the compound is C2H5N2O3S.

To determine the empirical formula of the compound, we need to find the ratio of the elements present in the compound based on the given data.

From the combustion of the first sample, we know that 2.29 g of the compound produces 2.47 g of CO2 and 1.35 g of H2O. To find the moles of carbon and hydrogen, we can use the molar masses of CO2 and H2O. The molar mass of CO2 is 44 g/mol, so the moles of carbon are 2.47 g / 44 g/mol = 0.056 moles. The molar mass of H2O is 18 g/mol, so the moles of hydrogen are 1.35 g / 18 g/mol = 0.075 moles.

From the combustion of the second sample, we know that 5.83 g of the compound produces 3.82 g of SO3. Using the molar mass of SO3 (80 g/mol), we find that the moles of sulfur are 3.82 g / 80 g/mol = 0.048 moles.

From the combustion of the third sample, we know that 7.52 g of the compound produces 3.88 g of HNO3. Using the molar mass of HNO3 (63 g/mol), we find that the moles of nitrogen are 3.88 g / 63 g/mol = 0.062 moles.

Finally, to find the moles of oxygen, we subtract the sum of the moles of carbon, hydrogen, sulfur, and nitrogen from the total moles of the compound. The total moles can be calculated using the molar mass of the compound as 2.29 g / molar mass = 0.026 moles. Subtracting the moles of the other elements, we get 0.026 - 0.056 - 0.075 - 0.048 - 0.062 = -0.215 moles of oxygen. Since the result is negative, it suggests that the compound contains oxygen in a greater proportion than the other elements. Therefore, we assume that the oxygen is present in a ratio of 1:1 with the lowest whole number ratio of the other elements.

Putting all the ratios together, we obtain the empirical formula C2H5N2O3S, which represents the simplest whole number ratio of atoms in the compound.

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The isentropic equation can be derived from the first law of thermodynamics by assuming adiabatic and reversible processes, resulting in the equation T1/T2 = (P1/P2)^((γ-1)/γ), where T1 and T2 are temperatures, P1 and P2 are pressures, and γ is the specific heat ratio.

The first law of thermodynamics states that energy is conserved in a closed system, given by the equation ΔQ = ΔU + ΔW, where ΔQ is the heat transfer, ΔU is the change in internal energy, and ΔW is the work done.

To derive the isentropic equation, we consider an adiabatic and reversible process, meaning there is no heat transfer and the system is in equilibrium throughout. Therefore, ΔQ = 0 and ΔU = 0.

Start with the first law of thermodynamics: ΔQ = ΔU + ΔW.

For an adiabatic process, ΔQ = 0, so the equation becomes 0 = ΔU + ΔW.

In an adiabatic process, the work done is given by ΔW = -PΔV, where P is the pressure and ΔV is the change in volume.

Using the ideal gas law, PV = nRT, we can express the change in volume as ΔV = (V2 - V1) = (nR/P)(T2 - T1), where n is the number of moles of gas, R is the specific gas constant, and T1 and T2 are the initial and final temperatures, respectively.

Substituting the expressions for ΔW and ΔV into the equation 0 = ΔU + ΔW, we get 0 = ΔU - (nR/P)(T2 - T1).

Since the process is reversible, ΔU = C_vΔT, where C_v is the heat capacity at constant volume and ΔT is the change in temperature.

Combining the previous equations, we have 0 = C_vΔT - (nR/P)(T2 - T1).

Rearranging the equation and simplifying, we obtain T1/T2 = (P1/P2)^((γ-1)/γ), where γ = C_p/C_v is the specific heat ratio.

Therefore, the isentropic equation is derived from the first law of thermodynamics by assuming adiabatic and reversible processes, resulting in the relationship T1/T2 = (P1/P2)^((γ-1)/γ), where T1 and T2 are temperatures, P1 and P2 are pressures, and γ is the specific heat ratio.

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The pressure of the gas inside the cylinder is 52.90 atm

Given is the number of moles of gas, the temperature and the volume of the gas and we need to find the pressure of the gas inside the cylinder, for this we can use the ideal gas law equation:

PV = nRT

Where:

P = Pressure of the gas (in units of pressure, such as atm)

V = Volume of the gas (in liters)

n = Number of moles of the gas

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

T = Temperature of the gas (in Kelvin)

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

T = 25.0 °C + 273.15 = 298.15 K

Now we can substitute the values into the ideal gas law equation:

P × 12.5 L = 27.0 moles × 0.0821 L·atm/(mol·K) × 298.15 K

Simplifying the equation:

P × 12.5 L = 661.2587 L·atm

Dividing both sides by 12.5 L:

P = 661.2587 L·atm / 12.5 L

P ≈ 52.90 atm

Therefore, the pressure of the gas inside the cylinder is approximately 52.90 atm.

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We can use the ideal gas law equation to determine the pressure of a gas within a cylinder:

PV = nRT

Where:

P is the pressure of the gas (in units of pressure, such as atm)

V is the volume of the gas (in units of volume, such as liters)

n is the number of moles of the gas

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

T is the temperature of the gas (in units of temperature, such as Kelvin)

we need to convert the temperature from Celsius to Kelvin:

T(K) = T(°C) + 273.15

T(K) = 25.0 °C + 273.15

T(K) = 298.15 K

Now we can plug the data into the ideal gas law equation as follows:

P * 12.5 L = 27.0 moles * 0.0821 L·atm/(mol·K) * 298.15 K

Simplifying the equation:

P = (27.0 moles * 0.0821 L·atm/(mol·K) * 298.15 K) / 12.5 L

Calculating the pressure:

P ≈ 5.046 atm

As a result, the gas inside the cylinder is under a pressure of about 5.046 atm.

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Answer:

c

solids do vibrate very minutely\

Explanation:

Answer:

sunlight, light energy from the sun

Explanation:

energy is transferred from the sun to plants then animal's eat plants

This viewpoint contends that biological and genetic variables have an impact on personality. One illustration of the way a biological perspective may be utilised to explain human personality is temper.

A few behavioural and psychological features that each person's DNA can influence include intelligence, personality, and propensity for mental illness. The both adults and the children in a family may be impacted by these characteristics.

According to Hans Eysenck's theory, personality has a biological basis and that genetic legacy contributes to personality differences [62,115]. Extraversion, neuroticism, and psychoticism are the three independent super-factors in the Eysenck model.

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Answer:

The response is an unlearned behavior demonstrating the natural ability to form emotional connections.

Explanation:

I just know (;

The new pressure of the gas is 692 Pa.

Using the ideal gas law, PV = nRT, where P is pressure, V is volume, n is moles, R is the gas constant, and T is temperature, we can solve for the new pressure.

Initially, we have P1V1 = nRT1, where P1 = unknown, V1 = 1.2 m3, n = 1.3 moles, R = 8.31 J/mol*K, and T1 = 400 K.

During the isochoric process, the volume remains constant, so V2 = V1 = 1.2 m3.

The final temperature is 2T1 = 2400 K = 800 K.

Now we can solve for P2:

P1 = nRT1/V1 = (1.3 mol)(8.31 J/mol*K)(400 K)/(1.2 m3) = 346 Pa

P2 = P1(T2/T1) = (346 Pa)(800 K)/(400 K) = 692 Pa

Therefore, the new pressure of the gas is 692 Pa.

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False. While all four jovian planets (Jupiter, Saturn, Uranus, and Neptune) are primarily made of gas, they are not primarily made of hydrogen and oxygen.

Jupiter and Saturn are primarily made of hydrogen and helium, while Uranus and Neptune are primarily made of ices (water, methane, and ammonia) and rock. The exact composition of these planets varies based on their distance from the sun, the temperature of their interiors, and other factors. However, it is generally accepted that the jovian planets are mostly made of gases and ices, with only a small solid core at their center.
False. All four Jovian planets (Jupiter, Saturn, Uranus, and Neptune) are primarily composed of hydrogen and helium, not hydrogen and oxygen. These gas giants have a small rocky core, surrounded by a thick layer of gas, mostly hydrogen and helium. The composition and size of their cores vary, but the primary elements remain consistent throughout. While some water, ammonia, and methane are present in their atmospheres, oxygen is not a dominant component in their overall composition.

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Answer:

208.9 g.

Explanation:

The balanced chemical equation for the reaction between iron (Fe) and sulfur (S) to form iron sulfide (FeS) is:

8 Fe + S8 → 8 FeS

According to the balanced equation, 1 mole of S reacts with 8 moles of Fe to produce 8 moles of FeS. The molar mass of sulfur (S) is 32.06 g/mol, and 15.0 g of S corresponds to:

15.0 g S × (1 mol S / 32.06 g S) = 0.468 mol S

we need

Molar mass of S is 32 g/mol and of Fe is 55.8 g/mol

Since the reaction occurs with excess Fe, the amount of FeS produced is limited by the amount of S that reacts. Therefore, we can use the mole ratio between S and FeS to determine the amount of FeS produced.

0.468 mol S × (8 mol FeS / 1 mol S) × (55.8 g FeS / 1 mol FeS) = 208.9 g FeS

Therefore, when 15.0 g of S reacts with excess Fe, the amount of FeS that can be produced is 208.9 g.