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3 years ago

When the Moon is positioned between the Sun and Earth, we are seeing a __________ moon. A) new B) full C) half D) crescent

Chemistry

2 answers:

Nadusha1986 [10]3 years ago

4 0

full moon fasholi. woodgang

crimeas [40]3 years ago

4 0

When the Moon is positioned between the Sun and Earth, we see a new moon.

A new moon is where the moon is covered by the sun, invisible to the human eye.

Or, c.

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Convert the composition of the following alloy from atom percent to weight percent (a) 44.9 at% of silver, (b) 46.3 at% of gold,

vesna_86 [32]

Answer:

Mass percentage of gold : 33.35%

Mass percentage of silver: 62.80%

Mass percentage of copper : 3.85%

Explanation:

$N=n\times N_A$

Where : N = Number of atoms

n = moles

$N_A=6.022\times 10^{23}$ = Avogadro number

Let the total atoms present in the alloy be 100.

Atom percentage of silver = 44.9%

Atoms of of silver = 44.9% of 100 atoms = 44.9

Atomic weight of silver = 107.87 g/mol

Mass of 44.9 silver atoms = 107.87 g/mol × 44.9 = 4,843.363 g/mol

Atom percentage of gold= 46.3%

Atoms of of gold = 46.3% of 100 atoms = 46.3

Atomic weight of gold = 196.97 g/mol

Mass of 44.9 gold atoms = 196.97 g/mol × 46.3 = 9,119.711 g/mol

Atom percentage of copper = 8.8 %

Atoms of of copper = 8.8% of 100 atoms = 8.8

Atomic weight of copper = 63.55 g/mol

Mass of 44.9 copper atoms = 63.55 g/mol × 8.8 = 559.24 g/mol

Total mass of an alloy :4,843.363 g/mol + 9,119.711 g/mol + 559.24 g/mol

Mass percentage of gold :

$\frac{4,843.363 g/mol}{4,843.363 g/mol + 9,119.711 g/mol + 559.24 g/mol}\times 100=33.35 \%$

Mass percentage of silver:

$\frac{9,119.711 g/mol}{4,843.363 g/mol + 9,119.711 g/mol + 559.24 g/mol}\times 100=62.80\%$

Mass percentage of copper :

$\frac{559.24 g/mol}{4,843.363 g/mol + 9,119.711 g/mol + 559.24 g/mol}\times 100=3.85\%$

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3 years ago

If you had a pot of boiling water that is loosing volume is that at equilibrium? What are some things you can do to a pot of boi

ki77a [65]

Answer:

are you rich in points brother ? or sister ?

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3 years ago

Paul has different spoons for cooking. He told Sue that he likes to stir hot food with a wooden spoon because it does not burn h

IceJOKER [234]

Answer:

Sue was not right as wood is not a heat conductor and will not allow heat to pass through the spoon thus keeping the hand safe. In a meatal spoon, heat can pass through and burn the hand as meatal is a good conductor of heat.

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3 years ago

Convert these temperatures to Celsius:<br><br> a. 303 K<br><br> d. 45 K

andre [41]

303K − 273.15 = 29.85°C

45K − 273.15 = -228.1°C

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2 years ago

Coefficients of the correct balanced equation for the reaction, CaCl2 + AgNO3 ⟶ AgCl + Ca(NO3)2.

mote1985 [20]

Answer:

CaCl2 + 2 AgNO3 ---> 2 AgCl + Ca(NO3)2

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3 years ago