the value of ΔE for a system that performs 13KJ of work on its surroundings and loses 9KJ of heat is ??

Answer:

Explanation:

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Answer:

X¹/⁴ Y¹/²

Explanation:

From the question given above, we are required to simplify:

⁸√(X²Y⁴)

The above expression can be simplified as follow:

⁸√(X²Y⁴)

Recall:

ⁿ√Aᵐ = Aᵐ/ⁿ

Therefore,

⁸√(X²Y⁴) = X²/⁸ Y⁴/⁸

⁸√(X²Y⁴) = X¹/⁴ Y¹/²

Thus, ⁸√(X²Y⁴) is equivalent to X¹/⁴ Y¹/²

Answer:

Potential energy = mass(velocity)

Explanation:

It is the formula used to explain how to find the answer for potential energy

Answer:

heterozygous

Answer:

No

Explanation:

It is not easier for an atom to lose a proton or a neutron because these particles are held together by very strong nuclear forces within the atom.

Protons are positively charged particles

Neutrons do not carry any charges.

  In the nucleus of an atom, both protons and neutrons can be found.

As with both particles, the very strong attractive force makes them very difficult to remove in ordinary chemical reactions.

Nuclear forces are one of the strongest forces that keeps an atom especially the nucleus together. Only in nuclear reactions to we encounter a situation where nuclear materials are changed, in that regard the properties of the atom also changes.

Answer:Solar flares have been known to affect electronic communication because their energy stirs up the Earth's upper atmosphere.

Explanation:

Answer:

Li+, C4+, O2-, and then F- They're written in decreasing ionic size.

Explanation:

Ionic size means the same thing as ionic radius.  Furthermore, Ionic radius is the distance away from the central atom. Ionic radius increases going from top to bottom and decreases across the periodic table.

Lithium is in the 1st family/group with a charge of +1.  So it has the biggest ionic radius.

Carbon is in the 4th family/group with a charge of +4. So it has a smaller ionic radius than Lithium.

Oxygen is in the 6th family/group with a charge of -2.  So it has a smaller ionic radius than Carbon.

Lastly, Fluorine is in the 7th family/group with a charge of -1. So it has a smaller ionic radius than Oxygen.

The balanced equation :

4Fe + 3O₂⇒ 2Fe₂O₃

Given

Rust reaction

Required

Balanced equation

Solution

Reaction

Fe + O₂⇒ 2Fe₂O₃

For a simple equation where one of the reaction coefficients is known, we can immediately add the corresponding coefficient using the principle that the number of atoms of the components in the reactants and products is the same.

In the above reaction :

Fe, left=1, right = 4, so coefficient in the left=4

O, left=2, right = 6, so coefficient in the left=3

Answer:

6.07 g.

Explanation:

Hello!

In this case, given the chemical reaction:

[tex]Zn + H_2CO_3 \rightarrow ZnCO_3 + H_2[/tex]

We first need to compute the moles of each reactant considering their molar masses:

[tex]n_{Zn}=4gZn*\frac{1molZn}{65.38 gZn} =0.0612molZn\\\\n_{H_2CO_3}=3gH_2CO_3*\frac{1molH_2CO_3}{62.03 gH_2CO_3} =0.0484molH_2CO_3[/tex]

Now, compute the mass of zinc carbonate yielded by each reactant in order to pick out the correct limiting reactant:

[tex]n_{ZnCO3}^{by\ Zn} = 0.0612molZn*\frac{1molZnCO3}{1molZn}*\frac{125.4 gZnCO3}{1molZnCO3}=7.67gZnCO3 \\\\n_{ZnCO3}^{by\ H_2CO3} = 0.0484molH_2CO3*\frac{1molZnCO3}{1molH_2CO3}*\frac{125.4 gZnCO3}{1molZnCO3}=6.07gZnCO3[/tex]

Thus, we conclude carbonic acid is the limiting reactant as it produces the fewest grams of product and therefore the yielded mass of zinc carbonate product 6.07 g.

Best regards.

Answer:

[tex]r=-0.033\frac{M}{s}[/tex]

Explanation:

Hello!

In this case, since the average rate of reaction is computed as a change given by:

[tex]r=\frac{\Delta [NH_4NO_2 ]}{\Delta t}[/tex]

In such a way, given the concentrations at the specified times, we plug them in to obtain:

[tex]r=\frac{(1.48M-4.12M)}{(330s-250s)}\\\\r=-0.033\frac{M}{s}[/tex]

Whose negative sign means the concentration decreased due to the decomposition.

Best regards!

Answer:

25 g

Explanation:

Integers are positive or negative whole numbers together with zero. This definition implies that 25.1 g is not an integer.

Seeing that .10 is less than .50, we have to round 25.10 down to 25.

Hence, if i express 25.10g as an integer, i end up with 25 g

Relative humidity is the percentage of what it can hold. Humidity is the measure of the amount of water vapor it can hold.

hope this helps ^^

Answer:

true

Explanation:

Answer: b

Explanation:

Answer: When water is added to vinegar, the vinegar's acidity decreases, which results in a higher number on the pH scale. However, diluting vinegar with water can never make it alkaline, because water itself is not alkaline; the pH of the mixture can't be higher than the higher pH value of the two components.

Explanation: it loses acidity. Diluting it can never make it alkaline and the PH mixture can’t be higher.

Answer:

Explanation:

The chemical formula for hydrogen phosphate​ is HPO₄²⁻

Answer:

compressible.

definite volume.

low density.

indefinite shape.

Answer:

As the temperature heats up then the viscosity is much higher, as defined in stress analysis and fluid mechanics. Reynolds number describes the speed and the inverse proportion.

Answer:

502.9 nm

Explanation:

Energy to break to the bond of carbon-iodine is not given assuming it to be 238KJ/mol

we know that

ΔE= hυ

also, υ= c/λ

therefore λ = hc/ΔE

[tex]= \frac{6.626\times10^{-34}\times3\times10^8}{238\times10^3}\\=0.08352\times10^{-29} m mol[/tex]

also, 1 mol = 6.022×10^23 atoms or molecules

[tex]\lambda= 0..08352\times10^{-29}\times6.022\times10^{23}\\=502.9 \times10^{-9}m\\=502.9 nm[/tex]

Answer:

ΔH = -29.78 KJ/mol

Explanation:

To calculate the Standard enthalpy of change for this reaction, we need to use the following expression:

ΔH = ΔHf(products) - ΔHf(reactants)   (1)

Now, the standard heat of formation can be found in different handbooks or websites. I manage to find these for the compounds of the reaction:

ΔHf Ca(OH)₂ = -1002.82 KJ/mol

ΔHf HCl = -167.4 KJ/mol

ΔHf CaCl₂ = -795.8 KJ/mol

ΔHf  H₂O = -285.8 KJ/mol

With these values, we can calculate the enthalpy change of the reaction using (1). Let's calculate first the individual values of the products and reactants and then, we can use (1):

Reaction: Ca(OH)₂ + 2HCl ---------> CaCl₂ + 2H₂O

ΔHf (products) = ΔHf CaCl₂ + ΔHf H₂O

ΔHf (products) = (-795.8) + 2(-285.8)

ΔHf (products) = -1367.4 KJ/mol

Keep in mind that if the compound has a coefficient that balances the reaction, you need to multiply that number by the standard heat. Let's calculate reactants:

ΔHf (reactants) = ΔHf Ca(OH)₂ + ΔHf HCl

ΔHf (reactants) = (-1002.82) + 2(-167.4)

ΔHf (reactants) = -1337.62 KJ/mol

Finally using expression (1) we have:

ΔH = (-1367.4) - (-1337.22)

Answer:

Density

Explanation:

Density is defined as the mass per unit volume. It is the ratio between the mass and the volume of a substance. It does not matter how large or small a sample of matter is, the same substance will always have the same density, because of this. The ratio between the mass and volume remains the same.

Answer:

im pretty sure 18 is eye

Explanation:

collision theory

Explanation:

Collision theory, theory used to predict the rates of chemical reactions, particularly for gases. The collision theory is based on the assumption that for a reaction to occur it is necessary for the reacting species (atoms or molecules) to come together or collide with one another.

Answer:

Group 1 elements tend to react with group Group 17 elements to form alkyl halide.

Answer:

A higher hill will give more potential energy, and a lower hill will give less.

Explanation: Gravitational potential energy is the energy stored in an object based on its height and mass.  The potential energy in an object increases as its elevation increases.

Answer:

0.4 m/s2 towards the West.

Explanation:

MARK ME THE BRAINLIES PLEASE!!