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3 years ago

9. Diamonds and quartz crystals look very similar but diamonds cost considerably

1 answer:

8 0

Natural diamonds are made very deep within earth's surface where high temperatures and pressure exist naturally, thus making them much more difficult to obtain, and making them a more expensive option that Swarovski Crystal.

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Describe an advantage of using dry ice to ship cardboard cartons of ice cream over long distances

Nina [5.8K]

Dry ice last longer then normal ice and it stays in its form longer buy in bulk from certain places may be cheaper. When ice is being shipped for a longer amount of time it will keep the ice cream colder because it last much longer and gets to -78.5 c or -109.3 f

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4 years ago

How is the value of an atomic number detirme?

serious [3.7K]

The number of protons in the nucleus determines the atomic number of an element.

Every element has its own characteristic atomic number.

4 0

4 years ago

How much ice (in grams) would have to melt to lower the temperature of 353 mL of water from 26 ∘C to 6 ∘C? (Assume the density o

Rashid [163]

Answer:

The mass of ice required to melt to lower the temperature of 353 mL of water from 26 ⁰C to 6 ⁰C is 85.4197 kg

Explanation:

Heat gain by ice = Heat lost by water

Thus,

Heat of fusion + $m_{ice}\times C_{ice}\times (T_f-T_i)=-m_{water}\times C_{water}\times (T_f-T_i)$

Where, negative sign signifies heat loss

Or,

Heat of fusion + $m_{ice}\times C_{ice}\times (T_f-T_i)=m_{water}\times C_{water}\times (T_i-T_f)$

Heat of fusion = 334 J/g

Heat of fusion of ice with mass x = 334x J/g

For ice:

Mass = x g

Initial temperature = 0 °C

Final temperature = 6 °C

Specific heat of ice = 1.996 J/g°C

For water:

Volume = 353 mL

$Density (\rho)=\frac{Mass(m)}{Volume(V)}$

Density of water = 1.0 g/mL

So, mass of water = 353 g

Initial temperature = 26 °C

Final temperature = 6 °C

Specific heat of water = 4.186 J/g°C

So,

$334x+x\times 1.996\times (6-0)=353\times 4.186\times (26-6)$

$334x+x\times 11.976=29553.16$

345.976x = 29553.16

x = 85.4197 kg

Thus,

<u>The mass of ice required to melt to lower the temperature of 353 mL of water from 26 ⁰C to 6 ⁰C is 85.4197 kg</u>

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4 years ago

On Earth, the mass of one of the lunar landing modules used to explore the moon was measured to be about 4,200 kg. The accelerat

Fed [463]

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4 years ago

Read 2 more answers

Calculate the formula mass for the compound nitrous acid.

kari74 [83]

Answer:

47.01g/mol

Explanation:

The formula of Nitrous acid is HNO₂:

The formula mass of a compound gives the sum of the atomic masses of the elements that makes up a compound.

Atomic mass of H = 1.0079g/mol

N = 14.0067g/mol

O = 15.9994g/mol

Formula mass of HNO₂ = 1.0079 + 14.0067 + 2(15.9994)

= 1.0079 + 14.0067 +31.9988

= 47.01g/mol

8 0

4 years ago