A substance that has a pH = 7 is a/an

-Acid
-base
-neutral solution
-none of the above

= 87 : 29

= 3 half lives

Answer: 0.7 M

Explanation:

molarity = (moles of solute)/(liters of solution) = 1.75/2.5 = 0.7 M

Answer(s):

Template: reactants ⇒ products

1. [tex]Ag+KNO_3[/tex] ⇒ [tex]AgNO_3 + K[/tex]

2. [tex]Zn+AgNO_3[/tex] ⇒ [tex]Zn(NO_3)_2 + Ag[/tex]

3. [tex]Al + H_2SO_4[/tex] ⇒ [tex]Al_2(SO_4)_3 + H_2[/tex]

4. [tex]Cl_2+KI[/tex] ⇒ [tex]HCl + I_2[/tex]

5. [tex]Li + H_2O[/tex] ⇒ [tex]LiOH + H_2[/tex]

6. [tex]Cu + FeSO_4[/tex] ⇒ [tex]CuSO_4 + Fe[/tex]

7. [tex]Na + H_2O[/tex] ⇒ [tex]NaOH + H_2[/tex]

8. [tex]Fe+Pb(NO_3)_2[/tex] ⇒ [tex]Fe(NO_3)_2 + Pb[/tex]

9. [tex]Cu+H_2O[/tex] ⇒ [tex]CuO + H_2[/tex]

10. [tex]Cu+Al_2(SO_4)_3[/tex] ⇒ [tex]CuSO_4 + Al[/tex]

11. [tex]Al + Pb(NO_3)_2[/tex] ⇒ [tex]Al(NO_3)_3 + Pb[/tex]

What is a chemical equation?

A chemical equation consists of the chemical formulas of the reactants (on the left) and the products (on the right). The two are separated by an arrow symbol (“→” usually read aloud as “yields”). Each individual substance's chemical formula is separated from others by a plus sign.

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The model of atoms undergoing nuclear fission will decrease in size while that of atoms undergoing nuclear fusion will increase in size.

Radioactive decay is a process in radioactivity in which the nucleus of atoms spontaneously breakdown or decay to produce smaller atomic nucleus with the emission of radiation.

Nuclear fusion involves the merging together of the nucleus of two or more smaller atoms to produce a larger atom whereas nuclear fission is the splitting of the nucleus of larger atoms into smaller atomic nuclei.

Therefore, the model of atoms undergoing nuclear fission will decrease in size while that of atoms undergoing nuclear fusion will increase in size.

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Answer:

This is for the table

Explanation:

Sorry for my handwriting

4.9 moles of salt are required to be added to 1 kg water to change the boiling temperature

by 5°C.

Based on the given equation, the molality of the solution is calculated as follows:

Change in temperature = 5 °C

Kb = 0.51

i = 2

Molality = 5/0.51 × 2 = 4.9 molal

Also, Molality = moles/kg of water

Moles of salt = molality × kg of water

Moles of salt = 4.9 × 1 = 4.9 moles.

Therefore, 4.9 moles of salt are required to be added to 1 kg water to change the boiling temperature

by 5°C.

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When we convert 5000 grams of hydrogen into water, the mass of the water obtained is 45000 g

2H₂ + O₂ —> 2H₂O

Molar mass of H₂ = 2 g/mol

Mass of H₂ from the balanced equation = 2 × 2 = 4 g

Molar mass of H₂O = 18 g/mol

Mass of H₂O from the balanced equation = 2 × 18 = 36 g

SUMMARY

From the balanced equation above,

4 g of H₂ reacted to produce 36 g of H₂O

From the balanced equation above,

4 g of H₂ reacted to produce 36 g of H₂O

Therefore,

5000 g of H₂ will react to produce = (5000 × 36) / 4 = 45000 g of H₂O

Thus, 5000 g of H₂ is equivalent to 45000 g of H₂O

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The chemical equation between Ba(OH)2 and H2CO3 is Ba(OH)₂ + H₂CO₃ → BaCO₃ + 2 H₂O.

A balanced equation has the reactants are on the left side of the arrow, whereas the products are on the right.

The number in front of a chemical formula denotes the number of moles in a compound. The number of atoms in a single molecule is indicated by subscripts (numbers below an atom).

Thus, the chemical equation is Ba(OH)₂ + H₂CO₃ → BaCO₃ + 2H₂O.

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Coltan, lumber and fossil fuels are all part of the resources that exists in the environment.

The term resources refer to those materials that we extract from the environment that can be used or our good. These resources could include minerals or energy raw materials.

However, coltan, lumber and fossil fuels are all part of the resources that exists in the environment.

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Answer B A B A

Explanation:

i got it right

The correct order of the atmospheric layers from bottom to top are

1.137448506 mol moles of chlorine gas would occupy a volume of 35.5 L at a pressure of 100.0 kPa and a temperature of 100.0 degrees Celsius.

The ideal gas equation, pV = nRT, is an equation used to calculate either the pressure, volume, temperature or number of moles of a gas. The terms are: p = pressure, in pascals (Pa). V = volume, in [tex]m^3[/tex].

We apply the formula of the ideal gases, we clear n (number of moles); we use the ideal gas constant R = 0.082 l atm / K mol:

PV= nRT

Given data:

P=100.0 kPa =0.986923 atm

T=100 degree celcius= 100 + 273 =373 K

V=35.5 L

Substituting the values in the equation.

n= [tex]\frac{\;0,98 \;atm \;X \;35,5 \;L }{\;0,082\;atm / \;K mol \;X \;373 K}[/tex]

n= 1.137448506 mol

Hence, 1.137448506 mol moles of chlorine gas would occupy a volume of 35.5 L at a pressure of 100.0 kPa and a temperature of 100.0 degrees Celsius.

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Answer:

long toes

Explanation:

the other traits are personality related, not a biological factor. they can be learned, but not inherited

The enthalpy change for the reaction 2K + S + K2S using the following thermochemical reactions is mathematically given as

dn=70.7kg

Generally, the equation for the  Chemical reaction is mathematically given as

2k+s----->K2S

Therefore

KS+K----->K2S

Therefore

dn=dn1+dn2

dn=32.5+38.2

dn=70.7kg

In conclusion,  the enthalpy change is

dn=70.7kg

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Let's see

[tex]\\ \rm\Rrightarrow C_{12}H_{22}O_{11}[/tex]

[tex]\\ \rm\Rrightarrow 12(12)+22(1)+11(16)[/tex]

[tex]\\ \rm\Rrightarrow 144+22+176[/tex]

[tex]\\ \rm\Rrightarrow 166+176[/tex]

[tex]\\ \rm\Rrightarrow 342g/mol[/tex]

The required amount of KClO₃ to prepare a saturated solution is 48 grams.

The ability of a material, the solute, to create a solution with another substance, the solvent, is known as solubility.

Given graph is plotted between the temperature and solubility of the substance at 100g of water, so for the given points calculation will be:

x = (40)(68) / (100) = 27.2g

Hence, we require almost 48g of KClO₃ to prepare a saturated solution of KClO₃.

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Answer:

3 mol

Explanation:

[tex] \frac{1.81 \times 10 {}^{24} \times C \times atoms}{6.022 \times {10}^{23}\times C \times atoms \times mol {}^{ - 1} } = 3 \: \: mol \\ [/tex]

Answer: The disposal of radioactive waste.

               Is the most expensive source of energy.

               Nuclear electricity generation requires a lot of fuel.

Explanation: This are the main problems of Nuclear Electricity Generation.

Answer:

yes you are doing it right my chemistry teacher said said so

Answer:

elliptical/ellipse

Explanation:

» Concepts

Astronomer Johannes Kepler discovered and founded his three laws of planetary motion. One of these laws states that the orbit of all planets, including Earth, is in an elliptical shape rather than a circle.

The total question is not found here but the onion structures that we can see with 30 X are the cell wall and an important vacuole.

The 30X magnification does not exist, nowadays the current objective lens comes in 20X, and 40X.

Using this magnification, we might see plant cells that divide to produce  cell walls between daughter cells after a process called mitosis.

In conclusion, the total question is not found here but the onion structures that we can see with 30 X are the cell wall and an important vacuole.

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Answer:

It comes from the sun.

9.38ml of a 14.0 M solution of sulfurous acid is required to make 175 mL of a 0.750 M solution.

Molarity (M) is the amount of a substance in a certain volume of solution.

Molarity is defined as the moles of a solute per liters of a solution.

Molarity is also known as the molar concentration of a solution.

The units of molarity are M or mol/L.

M = moles solute / liters solution

We know that

M₁V₁ = M₂V₂

It is given that M₁ = 14 M

V₁ = ?

M₂= 0.75 M

V₂= 175 ml

so

14 * V₁ = 0.75 * 175

V₁ = 9.38 ml.

Therefore 9.38ml of a 14.0 M solution of sulfurous acid is required to make 175 mL of a 0.750 M solution.

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The molar solubility of AuCl₃ in a 0.013 M solution of magnesium chloride is 1.81×10⁻²⁸M.

The solubility product constant, Ksp, is the equilibrium constant for a solid substance dissolving in an aqueous solution. And for the AuCl₃, Ksp will be written as: Ksp = [Au³⁺][Cl⁻]³

Let the solubility of the AuCl₃ in 0.013M solution of magnesium chloride is x, of Au³⁺ is x and of Cl⁻ is 3x. But we know that MgCl₂ is a strong electrolyte and it completely dissociates into its ions and will produce 2 moles of chloride ions. For this solution let we consider the volume is 1 liter then the concentration of chloride ions in MgCl₂ is 2(0.013)=0.026M.

So, in MgCl₂ solution concentration of Cl⁻ becomes = 3x + 0.026.

Value of Ksp for AuCl₃ = 3.2 × 10⁻²³

On putting all values on the Ksp equation, we get

Ksp = (x)(3x + 0.026)³

Value of 3x is negligible as compared to the 0.026, so the equation becomes

3.2 × 10⁻²³ = (x)(0.026)³

x = 3.2×10⁻²³ / (0.026)³

x = 1.81×10⁻²⁸M

Hence the molar solubility of AuCl₃ in 0.010M MgCl₂ is 1.81×10⁻²⁸M.

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Entropy change is the randomness of the thermodynamic system. The change in the entropy when the water is condensed is 1573 J/K.

An entropy change is a product of mass and the ratio of the enthalpy of vaporization to the temperature.

Given,

Enthalpy of vapourization =  2257 J/gK

The temperature in kelvin = 373 k

The change in entropy is calculated as:

[tex]\begin{aligned} \rm \Delta S &= \rm m (\dfrac{\Delta H_{vap}}{T})\\\\&= 260 (\dfrac{2257}{373})\\\\&= 1573.24\;\rm J/K\end{aligned}[/tex]

Therefore, the change in entropy is 1574 J/K.

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Answer:

≈ 76.16%

Explanation:

What is Percent Yield? In chemistry, percent yield is the percent ratio of the weight of the product obtained to the theoretical yield. We calculate the percent yield by dividing the experimental yield by the theoretical yield and multiplying the result by 100 to express the final answer in %.

[tex]\frac{actual}{theoretical} (100)=percentyield[/tex]  ⇒  [tex]\frac{278}{365} (100)=76.1643835616[/tex]

≈ 76.16%

hope this helped :)

Answer:

76.16%

Explanation:

I know answer is correct because I got the exact same question :)

Answer:

5.1622 mol This is the answer for your questions

Answer:

firer burning I'm thinking

Each photon will give one electron, thereby the number of photons given each second are [tex]4.46\;\times\;10^{15}[/tex]. The power carried by the electrons is 0.255 mW.

A laser is a light-emitting device that enables the process of optical amplification to deduce electromagnetic radiations.

The given laser has a power output of 2.15 mW and a wavelength is 413 nm.

The energy of each photon emitted is given as:

[tex]E=h\nu=\dfrac{hc}{\lambda}=\rm \dfrac{(6.63 \;\times\; 10^{-34} m^2 kg s^{-1}) \;\times (3.0 \;\times\; 10^8 m s^{-1})}{413 \;\times\; 10^{-9} m}=4.81 \;\times\;10^{-19}[/tex]

The number of photons ejected at 2.15 mW is given as:

[tex]\rm \dfrac{2.15\;\times\;10^-^3\; J}{4.81\;\times\;10^-^1^9J}=4.46\;\times\;10^1^5 \;photons[/tex]

Each photon will give one electron, thereby the number of photons given each second are [tex]4.46\;\times\;10^{15}[/tex].

With the work function of 2.71 eV, the power carried by the electrons is given as:

[tex]KE_{e}=h\nu-\Phi=\rm 4.81\;\times\;10^{-19} J - 2.71 eV\;\times\; \dfrac{1.60 \;\times 10^{-19} J}{1 eV}=6.34 \;\times 10^{-20}[/tex]

The power carried by all the electrons ejected is given as:

[tex]P_{e}=\rm (4.02\;\times\;10^1^5 s^{-1}) \;\times\; (6.34 \;\times\; 10^{-20} J)=0.255 \;mW[/tex]

The power carried by the electrons is 0.255 mW.

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Answer:

2 groups

Explanation:

The molecule 3, 3-diethylpentane has 2 ethyl groups because the prefix di- means that there are 2 homogeneous substituent groups present in the molecule.