Gold has a density of 17.3 g/cm", what is the volume of 285g piece of gold?
(Show all work)

Answer:

they must have same atomic number and different atomic mass

Answer:

they bonding

Explanation:

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The hydroxide ion concentration, [OH-] = 2.439 x 10⁻¹⁰

Equilibrium of water and the ions :

[tex]\tt 2H_2O(l)\rightarrow H_3O^+(aq)+OH^-(aq)[/tex]

[tex]\tt Kc=\dfrac{[H_3O^+][OH^-]}{H_2O}[/tex]

Kc[H₂O] is the ion equilibrium constant for water ⇒ Kw.

The product of the concentrations of these ions (H₃O⁺ and OH⁻)at equilibrium at 25°C is 1.0 x 10⁻¹⁴ M

[H₃O⁺] [OH⁻] = 1.0 x 10⁻¹⁴ M = Kw

The hydrogen ion concentration of  [H⁺]=4.1 x 10⁻⁵ M, so  the hydroxide ion concentration, [OH-] :

[tex]\tt 4.1\times 10^{-5}\times [OH^-]=1.10^{-14}\\\\(OH^-]=\dfrac{1.10^{-14}}{4.1\times 10^{-5}}\\\\(OH^-]=2.439\times 10^{-10}[/tex]

Answer:

In the nucleus of an atom ,there are protons & neutrons. Protons have charge of 1.6× 10^-19 C, while neutrons have 0C charges. Electrons orbit outside the atom. Their charge is - 1.6 ×10^-19C

Explanation:

Answer:

option B is a right answer

Explanation:

please follow me

and as thanks for my answer

Answer:

its -3,811.92 aka.) A

Explanation:

The overall enthalpy of the reaction is represented in the graph by the letter A. The activation energy is represented by the letter B and the activated complex is represented by C.

The energy diagram of a reaction represents the energy change with respect to the rate of the reaction. It clearly depicts the energy profile of reactants and products, transition state of the reaction, activation energy and the overall enthalpy of the reaction.

The given diagram represents the energy profile for the photosynthetic reaction. The state with the highest activation energy is called transition state of the reaction. The minimum energy that must be acquired by the reactants to overcome the barrier potential is called activation energy.

For the given graph, the activation energy is represented by the letter B. The overall enthalpy of the reaction is represented in the graph by the letter A and the activated complex is represented by C.

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Your question is incomplete. But your complete question probably was:

Letter__shows the overall enthalpy of reaction.

Letter___shows the activation energy for the reaction

The activated complex is represented by

Answer:b) 2.53

Explanation:

Explanation:

ok that is ans k............

The temperature of the 20 L tank containing 68 g of carbon dioxide, CO₂ at 500 KPa is 778.5 K

Mole = mass / molar mass

Mole of CO₂ = 68 / 44

Mole of CO₂ = 1.545 moles

Using the ideal gas equation, the temperature of the gas can be obtained as follow:

PV = nRT

Divide both side by nR

T = PV / nR

T = (500 × 20) / (1.545 × 8.314)

T = 778.5 K

Thus, the temperature of the tank is 778.5 K

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Answer:

D

Explanation:

Because if I said its 35 degrees outside that has nothing to do with climate maybe if I said its usually 35 degrees in the month of December but just saying what temperature it doesn't tell you anything about climate

Well, the definition of climate is the weather conditions prevailing in an area in general or over a long period so I don't really know

So maybe it is d

Answer:

B

Explanation:

Weather refers to the short-term conditions of the lower atmosphere, such as precipitation, temperature, humidity, wind direction, wind speed, and atmospheric pressure. It could be sunny, cloudy, rainy, foggy, cold, hot, windy, stormy, snowing … the list goes on.

Answer:

The answer would be cation

Explanation:

Answer:

it's an anion

if it has more electrons than protons, then it has a negative net charge making it an anion

Answer:

120N

Explanation:

Answer:

3

Explanation:

Load / Effort

The effort is 30N and the Load is 90N.

So the MA is equal to 90/30 = 3

Answer:

uifhiuwrhuio fw

Explanation:

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Answer:

An asexually reproducing organism would have the best chance of repopulating the world.

Explanation:

Sexual reproduction is a method of reproduction that involves two parents and the formation and subsequent fusion of male and female gametes during fertilization. On the other hand, In asexual reproduction, only one parent is involved and produces offspring by making copies of itself through various methods such as binary fusion, budding and vegetatively.

In a case of a catastrophic event that wiped out almost all organisms, an organism that reproduces asexually have a greater chance of repopulating the world because of the following advantages in reproducing asexually:

1. Only one parent is needed, therefore reproduction is easier.

2. It isaves time and energy. Since almost all organisms have been wiped out, there is a lesser likelihood of finding a compatible mate, so reproducing asexually will give the organism a better chance.

3. It occurs at a very fast rate; much faster than sexual reproduction

4. The population can increase very quickly and colonization of new habitats is much easier.

All these advantages will give the esexually reproducig organism a fairer chance to repopulate the world.

Answer:

oxidation

Explanation:

the process or result of oxidizing or being oxidized.

hope this helpppppppppppppeddddddd

Solution :

From Fick's law:

[tex]$\frac{D_{AB}}{\Delta z } \times (C_{A1}-C_{A2})=N_a$[/tex]

Mass balance: Exits = Accumulation

[tex]-N_A A = \frac{dm}{dt}[/tex]

[tex]-N_A A = \frac{dVp}{dt}[/tex]

[tex]-N_A A = \frac{dV}{dt}p[/tex]

[tex]-N_A A = \frac{dhA}{dt}[/tex]

[tex]-N_A A = \frac{dh}{dt} \times Ap[/tex]

From the last step, area cancels out and thus leaves :

[tex]-N_A = \frac{dh}{dt} \times p[/tex]

So now we can substitute the [tex]$N_A$[/tex] by the Fick's law

[tex]$\frac{D_{AB}}{\Delta z } \times (C_{A1}-C_{A2})=\frac{dh}{dt} p$[/tex]

Substituting the values we get

[tex]$=\frac{-4 \times 10^{-13}}{0.0001} \times (3 \times 10^{26} - C_{A2}) = \frac{dh}{dt} \times 2.46$[/tex]

[tex]$=-4 \times 10^{-9} \times( 3 \times 10^{26} - C_{A2}) = 0.0001 \times 2.46$[/tex]

[tex]$= -7800 \times 4 \times 10^{-9} \times (3 \times 10^{26}-C_{A2})=0.000246$[/tex][tex]$=-(3 \times 10^{26}-C_{A2}) = 7.8846 \times 100 \times \frac{1}{69.62} \times 6.022 \times 10^{23}$[/tex]

[tex]$C_{A2} = 6.85 \times 10^{28} \ \text{ boron atoms} /m^3$[/tex]

The mass of sodium hydrogen carbonate : 10.5 g

Given

1.5 dm' of CO₂

1 mol gas= 24 L at RTP(25 °C, 1 atm)

Required

the mass of sodium hydrogen carbonate

Solution

Decomposition reaction of Sodium hydrogen carbonate :

2 NaHCO₃ (s) ⇒ Na₂ CO₃ (s) + H₂ O(g) + CO₂ (g)

mol CO₂ :

[tex]\tt mol=\dfrac{1.5}{24}=0.0625[/tex]

From the equation, mol ratio of NaHCO₃ : CO₂ (g) = 2 : 1, so mol NaHCO₃ :

[tex]\tt 2\times 0.0625=0.125[/tex]

Mass NaHCO₃(MW=23+1+12+3.16=84 g/mol) :

[tex]\tt mass=mol\times MW\\\\mass=0.125\times 84\\\\mass=10.5[/tex]

You haven't provided two critical pieces of info needed to answer this question. First, what's the half-life of Californium-252, and second, what's the initial amount of Californium-252. Given these two values, you can then set up an exponential equation to find the time elapsed.

Answer:

Rain shadow

Explanation:

Climate is the average weather condition of a place over a long period of time.

The image shows a rain shadow effect around a mountainous region. The type of rainfall controlled this way is known as an orographic rainfall.

the concentration of H* ions at a pH =2 = 10⁻²

the concentration of H* ions at a pH =6 = 10⁻⁶

a solution with a pH of 2 has 10⁴ times more hydrogen ions than a solution with a pH of 6

The concentration of H + ions in solution is measured in pH units. The greater the concentration of H + ions, the more acidic the solution will be, and vice versa if the concentration of H + ions is getting smaller, the more basic the solution and the greater the hydroxide concentration

The ph unit is on a scale between 0-14.

pH> 7, the solution is said to be alkaline

pH <7, the solution is said to be acidic

pH = 7, the solution is said to be neutral

Acidic solutions will have more hydrogen ions than hydroxide ions

A solution with a different value of n has a 10ⁿ difference in the concentration of H⁺ ions.

pH can be formulated:

[tex]\tt \boxed{\bold{pH=-log[H^+]}}[/tex]

[tex]\tt 2=-log[H^+]\\\\(H^+]=10^{-2}[/tex]

[tex]\tt 6=-log[H^+]\\\\(H^+]=10^{-6}[/tex]

pH 2 and pH 6

[tex]\tt \dfrac{10^{-2}}{10^{-6}}=10^4[/tex]

So a solution with a pH of 2 has 10⁴ times more hydrogen ions than a solution with a pH of 6

Answer:

17 for chlorine atom ; 18 electrons for a chlorine ion

Answer:

(a). 0.0037 mol.

(b). 22.42 L

(c). => When the measuring apparatus are not precise.

=> Error due to parallax.

=> Random errors.

Explanation:

Without mincing words let us dive straight into the solution to the question above. So, we are given the following parameters or information which are going to aid in solving this particular Question;

Mass of magnesium given= 0.0795 g, volume of Hydrogen = 88.5 mL = 0.0885 L, temperature = 25 degree C = 273 + 25 = 298K and pressure = 766 mm Hg = 766/760 = 1.00789 atm.

(a). In order to determine the number of moles of Hydrogen atoms,we will be making use of the formula below;

Number of moles = (pressure × Volume)/ gas constant,R × Temperature.

Thus,the number of moles of Hydrogen = 1.00789 × 0.0885 / [( 0.08206 × 298] = 0.0037 mol.

(b). The molar volume at stp can be calculated by using the same formula that was used in (a) above;

Molar Volume at stp = Gas constant,R × temperature/ Pressure = 0.08206 × 273 / 1 atm = 22.42 L.

(c). The major sources of errors are given below:

=> When the measuring apparatus are not precise.

=> Error due to parallax.

=> Random errors.

Answer:

At the cathode in an electrolytic cell, ions in the surrounding solution are reduced into atoms, which precipitate or plate out on to the solid cathode. The anode is where oxidation takes place, and the cathode is where reduction takes place.

Explanation:

Since positive ions pick up electrons at the negatively charged cathode, reduction takes place there.

The process of obtaining electrons or a decrease in an element's oxidation state in such a chemical reaction would be known as reduction, which is the movement of electrons among species. An increase in the number of electrons connected to a single or a collection of atoms is the result of a reduction chemical process.

The electron would be a subatomic particle with a negative one elementary charge electric charge. Due to their lack of components or substructure, electrons, which are part of the lepton particle family's first generation, have been typically regarded to be elementary particles.

In an electrolytic cell, the cathode is where ions in the neighboring medium could be converted into atoms, which then plate out or precipitated onto the solid cathode. Both oxidation and reduction occur at the anode but also cathode, respectively.

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Answer:

The Mycelium is usually hidden in the soil, in wood, or another food source. A Mycelium may fill a single ant or cover many acres. 

Answer:

Answered below

Explanation:

1) 2Na (s) + 2H2O (l) → 2NaOH (aq) + H2 (g)

2) 2Na (s) + H2 (g) → 2NaH (s)

3) Formula for graphite is C.

Thus;

Na + C → NaC

4) 2Na (s) + O2 (g) → 2Na_2O_2 (s)

5) 2Na (s) + Cl2 (g) → 2NaCl (s)

6) Na + Pb → NaPb

7) Na (s) + NH3 (g) → NaNH2 (s) + H2 (g)

The molecule which has a structure that is most like aspirin is benzene.

Aspirin, also known as acetylsalicylic acid, is a pain reliever, fever reducer, and inflammation reducer.

In the structure of aspirin one aromatic ring is present in which carboxylic group is present and molecular formula of aspirin is written as C₉H₈O₄.

Hence benzene has a structure that is most like aspirin.

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Answer:

for example the company has been in the United kingdom for women who have a lot to say it is not the only one that has the best of

Explanation:

get a little bit more of the year and

Answer:

for example the company has been in the United kingdom for women who have a lot to say it is not the only one that has the best of

Explanation:

Answer:

152.63 ml.

Explanation:

By proportion to get a 4.75 M solution the volume will be

(12/4.75) * 100 = 252.63 ml

So the answer is 152.63 ml.

molarity=number of moles/volume

First we find the number of moles of NaOH we have the molarity and the volume we transform mililiters in liters 100ml=0.1l

12=n/0.1 n=1.2 moles of NaOH

now we find the volume of the second solution

4.75=1.2/V

V=1.2/4.75=0.252l

0.252-0.1=0.152liters=152ml of pure water used to dilute