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Lera25 [3.4K]
3 years ago
8

Jessie has never seen snow, but today the weather conditions may be just right! He knows the temperature on the Fahrenheit therm

ometer must be _______ degrees or lower for him to see his first snow fall.
A) 32 o
B) 20 o
C) -10 0
D) -32 0
Chemistry
2 answers:
BARSIC [14]3 years ago
7 0
32 would be your answer
Natalka [10]3 years ago
3 0
The answer is 32° F, because water freezes at this temperature under normal pressures, and snow is water vapor frozen into ice crystals. 




N.b., it usually needs to be a little bit colder to have snow, but this is around the maximum (although I've seen snow around 38° F before).
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Wdym mole like the animal or something else ?
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A sample of aluminum, which has a specific heat capacity of , is put into a calorimeter (see sketch at right) that contains of w
Oksanka [162]

Complete Question

A sample of aluminum, which has a specific heat capacity of 0.897 JB loc ! is put into a calorimeter (see sketch at right) that contains 200.0 g of water. The aluminum sample starts off at 85.6 °C and the temperature of the water starts off at 16.0 °C. When the temperature of the water stops changing it's 20.1 °C. The pressure remains constant at 1 atm. Calculate the mass of the aluminum sample.

Answer:

M=58g

Explanation:

From the question we are told that:

Heat Capacity H=0.897

Mass of water M=200g

Initial Temperature of Aluminium T_a=85.6

Initial Temperature of Water T_{w1}=16.0

Final Temperature of Water  T_{w2}=16.0

Generally

Heat loss=Heat Gain

Therefore

M*0.897*(85.6-20.1) =200*4.184*(20.1-16)

M=58g

5 0
3 years ago
A study is conducted to examine the effect of NaCl concentration on enzyme activity with the following results. Activity was tes
Marina86 [1]

Answer:

The answer is "Option D".

Explanation:

The behavior of 0.1M NaCl also isn't substantially larger objectively than those of 0.05M NaCl because a p-value above 0.05 (p>0.05) indicates no ability to tell differential and is a strong proof in favor of a null hypothesis.

The other wrong choices can be defined as follows:

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Answer:

The atomic mass of the boron atom would be <em>10.135</em>

Explanation:

This is generally known as relative atomic mass.

Relative atomic mass or atomic weight is a physical quantity defined as the ratio of the average mass of atoms of a chemical element in a given sample to the atomic mass of 1/12 of the mass of a carbon-12 atom. Since both quantities in the ratio are masses, the resulting value is dimensionless; hence the value is said to be relative and does not have a unit.

<em>Note that the relative atomic mass of atoms is not always a whole number because of it being isotopic in nature.</em>

  • <em>Divide each abundance by 100 then multiply by atomic mass</em>
  • <em>Do that for each isotope, then add the two result. Thus</em>

Relative atomic mass of Boron = (18.5/100 x 11) + (81/100 x 10)

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