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3 years ago

What happens when the angle of the sun is perpendicular to the Earth's surface?

1 answer:

8 0

One side will burn to a crisp and the other side will freeze... and after some time the earth would be pulled into the sun and cooked

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A student is given 1.525 g of pure CuO. To recover the Cu present in the compound, the dark powdery solid was dissolved in 15.0

ikadub [295]

Answer:

The amount of Mg was enough

Explanation:

In this case, we have to start with the reaction between $Mg$ and $CuO$ , so:

$CuO~+~Mg~->~MgO~+~Cu$

If we check the reaction is already balanced. Now, we can do some stoichiometry to calculate the amount of Mg. The first step is the number of moles of $CuO$ . To this we have to calculate the molar mass of $CuO$ first, so:

Cu: 63.55 g/mol and O: 16 g/mol. So, (63.55+16)= 79.55 g/mol.

Now, we can calculate the moles:

$1.525~g~CuO\frac{1~mol~CuO}{79.55~g~CuO}=0.0192~mol~CuO$

The molar ratio between $Mg$ and $CuO$ is 1:1, so:

$0.0192~mol~CuO=0.0192~mol~Mg$ .

Now we can calculate the mass of Mg if we know the atomic mass of Mg (24.305 g/mol). So:

$0.0192~mol~Mg\frac{24.305~g~Mg}{1~mol~Mg}=0.466~g~Mg$

With this in mind, the student added enough Mg to recover all the Cu.

Note: The HCl doesn't take a role in the reaction. The function of HCl is to dissolve the $CuO$ .

I hope it helps!

3 0

3 years ago

How many moles of O2 are produced when 0.425 mol of KO2 reacts in this fashion

Oksi-84 [34.3K]

The chemical reaction is expressed as:

 4KO2+2CO2→2K2CO3+3O2

We are given the amount of KO2 to be used in the reaction. This will be the starting point of our calculations. We do as follows:

0.425 mol KO2 ( 3 mol O2 / 4 mol KO2 ) = 0.319 mol O2 produced

Hope this answers the question. Have a nice day.

4 0

3 years ago

An ionic bond forms between sodium chorine when the sodium atoms _______ electrons.

Natalija [7]

is 7 cus the valance electron for sodium is Ne 3s1 and for chlorine is Ne 3s13p5

4 0

4 years ago

Can someone do these? Brainliest included

mixas84 [53]

Answer:

Explanation:

6. p⁺ e⁻

Ca²⁺ 20 18

F⁻ 9 10

O²⁻ 8 10

Na⁺ 11 10

7. Physical properties of matter are properties that can be measured or observed without matter changing to an entirely different substance. These include odor, boiling point, melting point, density, electrical conductivity and heat conductivity.

Separation of mixture:

Chromatography involves solvent separation on a solid medium.

Distillation takes advantage of differences in boiling points.

Evaporation removes a liquid from a solution to leave a solid material.

Filtration separates solids of different sizes.

Funnel partitioning with solvents. Solvent dissolves one component but not the other.

8.Bulk Elements => Carbon, Hydrogen, Oxygen, Nitrogen, Sulfur & Phosphouous

Microminerals are those minerals needed in less than 100 mg quantities. Trace minerals or trace elements are usually needed in microgram quantities. Microminerals include iron, zinc, copper, iodine, fluoride, chromium, cobalt, selenium, manganese, and molybdenum.

Diatomic Molecules => H₂, N₂, O₂, F₂, Cl₂, Br₂, I₂

9. Electron Configurations

Na: 1s²2s²2p⁶3s¹ => valence = 3s¹

N: 1s²2s²2p³ => valence = 2s²2p³

Al: 1s²2s²2p⁶3s²3p¹ => valence = 3s²3p¹

Valence is the highest principle quantum number (or, principle energy level ~ ring) in the electron configurations.

10.moles of glucose = 450g/180.16 g/mol =2.50 moles

C₂H₆O₂ = 2(12) + 6(1) + 2(16) = 24 + 6 + 32 = 62 g/mole

7 0

3 years ago

Looters break a statue into pieces. How do you expect the weathering of pieces of rock to change?

andreyandreev [35.5K]

The statue will weather faster because of more surface area.

5 0

4 years ago