Explain why you can't just make gold out of a random yellow substance like straw or urine.

Answer:

Thx Have a fantastic day! :)

Explanation:

Answer:

Ca(OH)2 molecular weight. Molar mass of Ca(OH)2 = 74.09268 g/mol. This compound is also known as Calcium Hydroxide. Convert grams Ca(OH)2 to moles or moles Ca(OH)2 to grams. Molecular weight calculation: 40.078 + (15.9994 + 1.00794)*2 ››

Hey,

A) Let's first calculate the molar mass M of the molecule :

M(Ca(OH)₂) = M(Ca) + 2M(O) + 2M(H)

B) Let's deduct the corresponding mass m :

m = M x n

The mass of calcium hydroxide corresponding to this quantity of substance (in mol) is therefore 34 g.

Answer:

Explanation:

B

Answer:

a. Oxygen

b. 20.39g of Al₂O₃

c. 87%

Explanation:

In order to produce 2moles of Al₂O₃, we need to make react 4 moles of Al, to 3 moles of O₂.

We determine the limiting reactant with the moles of each:

12.98g / 26.98g/mol = 0.481 moles of Al

9.6g / 32g/mol = 0.300 moles of oxygen

4 moles of Al react to 3 moles of O₂

Then, 0.481 mol may react to (0.481 . 3)/4 = 0.361 moles

We only have 0.300 moles of O₂ and we need 0.361. Oxygen is the limiting reactant.

So 3 moles of O₂ can produce 2 moles of Al₂O₃

Our 0.300 moles may produce (0.300 . 2) / 3 = 0.200 mol

Our theoretical yield is: 0.2 mol . 101.96g/ mol = 20.39 g

To determine the percent yield we calculate:

(Produced yield/ Thoeretical yield) . 100 → (17.74 /20.39) . 100 = 87%

Answer:

The answer is B- LiNO3(aq)+H2O(I)

Explanation:

I just did the assignment also UNUS ANNUS

Answer:

b

Explanation:

Answer:

hello

Explanation:

answer is oxido nitrate please follow me

Answer:

By cooling the gas in the container the partial pressure of the gas will cause the gas to condense.  Imagine water vapor in a bottle if you cool it down it will condense into droplets as the molecules of gas start to slow down to to lower temp

Explanation:

Answer:

When the sweat hits the air, the air makes it evaporate (this means it turns from a liquid to a vapor). As the sweat evaporates off your skin, you cool down. Sweat is a great cooling system, but if you're sweating a lot on a hot day or after playing hard you could be losing too much water through your skin.

Explanation:

Hope it is helpful....

Answer:

Change occur due to change in the state.

Explanation:

The model must be changed from the previous one because the liquid is exposed to high temperature which change the liquid into gaseous state. Due to change in the state from liquid into gas, the particles are present at more distance from each other because the gas molecules has more distance due to weak intermolecular forces so we can say that change must occur in the model.

Answer:

a that all you need and why you just and use a calculators and what they are for

Answer:

Please give me Brainliest it would mean a lot

Answer:

latent heat, also called the heat of vaporization, is the amount of energy necessary to change a liquid to a vapour at constant temperature and pressure.

Explanation:

Answer:

Explanation:

Over 68 percent of the fresh water on Earth is found in icecaps and glaciers, and just over 30 percent is found in ground water. Only about 0.3 percent of our fresh water is found in the surface water of lakes, rivers, and swamps. Of all the water on Earth, more than 99 percent of Earth's water is unusable by humans and many other living things!

Answer:

imbibición

Explanation:

La propiedad responsable del fenómeno observado es la imbibición de la puerta de madera maciza.

La imbibición se refiere a una situación en la que las partículas sólidas de una sustancia absorben agua sin formar una solución.

A medida que la puerta de madera absorbe agua, se hincha. Esto es responsable del levantamiento de la puerta. Esta absorción de agua ocurre cuando la temperatura y la humedad relativa son altas. Esto es así porque el aire más cálido retiene más humedad.

Answer:

0.0562 moles

Explanation:

Based on the H-H equation, for the HF buffer:

pH = pKa + log [F⁻] / [HF]

Where pH is the pH of the buffer = 3.630

pKa is pKa of HF buffer: 3.17

And [] could be taken as the moles of each reactant

3.630 = 3.17 + log [F⁻] / [HF]

0.46 = log [F⁻] / [HF]

2.884 = [F⁻] / [HF] (1)

The initial moles of HF are:

0.250L * (0.303mol / L) = 0.07575 moles

The HF reacts with NaOH as follows:

HF + NaOH → NaF + H₂O

That means the moles of HF will be the initial moles of HF - Moles NaOH

And moles NaF = F⁻ = Moles of NaOH added

That means:

0.07575 moles = [F⁻] +[HF] (2)

Replacing (2) in (1):

2.884 = [F⁻] / 0.07575 moles - [F⁻]

0.218 - 2.884[F⁻] = [F⁻]

0.218 = 3.884[F⁻]

[F⁻]  = 0.0562 moles

That means the moles of NaOH that must be added are:

Answer:

6.31x10¹¹s⁻¹ = Frequency

Explanation:

To convert frequency to energy or vice versa we must use the equation:

e = h*f

Where e is energy in joules (4.18x10⁻²²J)

h is Planck's constant (6.626x10⁻³⁴Js)

Replacing:

4.18x10⁻²²J = 6.626x10⁻³⁴Js*f

Answer:

Nuclear decay is also called radioactive decay, and it occurs in a series of sequential reactions until a stable nucleus is reached. Nuclear reactions release much more energy—orders of magnitude more—than exothermic chemical reactions.

Explanation:

Answer:

citric acid = orange

I know the answer for this only..

Answer:

c

Explanation:

Answer:

pH= 0.92

Explanation:

HNO3-> H^+ +NO3^-

HNO3 is a strong acid, so it fully dissociates

[HNO3] = 0.12M    [H^+] = 0.12M  

pH= -log[H^+]

pH=-log[.12] = 0.92

pH = 0.92

Answer:

3,1,2

Explanation:

3 bc u go get liters

1 because ur going from C3H8 to CO2

2 because ur getting CO2 liters

Answer:

The Earth

Explanation:

Answer:

The Earth

Explanation:

Geothermal energy comes from the sub surface of the Earth. It is contained in the rocks and fluids beneath the earth's crust and can be found as far down to the earth's hot molten rock, magma.

answer:

explanation:

1.47 J/g°C is the specific heat capacity of a 70 g sample of an unknown metal that releases 6700J of heat when it cools from 90 to 25 degrees C.

The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases by 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).

q = mCpΔT

Solve for Cp —> Cp = q/mΔT

q = -6700 J (negative because it released heat)

m = 70 g

ΔT = Final temp - initial temp = 25 - 90 = -65°C

Cp = (-6700 J) ÷ (70 g)(-65°C)

= 1.47 J/g°C

Hence, 1.47 J/g°C is the specific heat capacity of a 70 g sample of an unknown metal that releases 6700J of heat when it cools from 90 to 25 degrees C.

Learn more about specific heat capacity here:

https://brainly.com/question/16952828

#SPJ2

Per my research, it was said that each of the atoms of the carbon has over 6 protons, six neutrons, and 6 protons. Each atom of nitrogen has 7 protons, 7 electrons, and 7 neutrons. The atomic mass of carbon and nitrogen is 12 and 14 respectively. As the number of electrons in the atoms of the two elements is different they have different chemical properties.

As you may know, I did my research and this is what it gave me. I would suppose it is correct since it explains that the carob has over 6 protons and so on. Correct me if I am incorrect and I hope this helped. Have a good one!

Answer:

The molecules tend to speed up and move faster throughout the substance once thermal energy increases. This is evident whenever we heat up water as its molecules tend to move faster throughout the water as thermal energy tends to increase

Hope this helps!

Answer:

You need 8 electrons to make a stable energy level. If you have any less, it won't make it "happy" per say, and with more it will make it happier but its probably safer to use the 8!

Explanation:

Hope this helps! Plz mark brainliest!