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3 years ago

If you asked a believer of the heliocentric theory how long a year last, what would they say?

1 answer:

4 0

We view a year as the time it takes our planet to make one full orbit around the sun which is 365 days. The heliocentric theory is the sun-centered universe theory which has been proven and we currently use to this day. I'm not sure if you meant the geocentric theory with the Earth at the center of the universe instead.

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How long does it take to electroplate 0.5 mm of gold on an object with a surface area of 31 cm^^ from an Au3+(aq) solution with

konstantin123 [22]

Answer:

It will take 5492 seconds to electroplate 0.5 mm of gold on an object .

Explanation:

Mass of gold = m

Volume of gold = v

Surface area on which gold is plated = $a=31 cm^2$

Thickness of the gold plating = h = 0.5 mm = 0.05 cm

1 mm = 0.1 cm

$V=a\times h=31 cm^2\times 0.05 cm=1.55 cm^3$

Density of the gold = $d=19.3 g/cm^3$

$m=d\times v=19.3 g/cm^3\times 1.55 cm^3=29.915g$

Moles of gold = $\frac{29.915 g}{197 g/mol}=0.152 mol$

$Au^{3+}+3e^-\rightarrow Au$

According to reaction, 1 mole of gold required 3 moles of electrons,then 0.152 moles of gold will require :

$\frac{3}{1}\times 0.152 mol=0.456 mol$ of electrons

Number of electrons = N = $0.456\times \times 6.022\times 10^{23}$

Charge on single electron = $q=1.6\times 10^{-19} C$

Total charge required = Q

$Q=N\times q$

Amount of current passes = I = 8 Ampere

Duration of time = T

$I=\frac{Q}{T}$

$T=\frac{N\times q}{I}$

$=\frac{0.456\times \times 6.022\times 10^{23}\times 1.6\times 10^{-19} C}{8 A}=5492 s$

It will take 5492 seconds to electroplate 0.5 mm of gold on an object .

7 0

3 years ago

C. Chemical energy. What is the difference in chemical energy between organic and inorganic

Olenka [21]

There are chief differences between organic and inorganic compounds. ... The main difference is in the presence of a carbon atom; organic compounds will contain a carbon atom (and often a hydrogen atom, to form hydrocarbons), while almost all inorganic compounds do not contain either of those two atoms.

8 0

3 years ago

To change an object from a liquid to a gas _________ must happen

nignag [31]

Evaporation!
-Melting is a solid to a liquid
-sublimation is directly from a solid to a gas
-condensation gas to liquid

4 0

3 years ago

How are scientific questions answered?

galben [10]

Answer:

Explanation:

Scientists always perform tests and observe and measure in the physical world to prove their points or answer their questions.

3 0

3 years ago

A wooden block has a volume of 25.3 cm3. Its mass is 17.0g. What is the density of this block?

kolbaska11 [484]

Density = (mass) / (volume)

Density = (17.0 g) / (25.3 cm³) = 0.672 gm per cm³. (rounded)

6 0

3 years ago