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Citrus2011 [14]
3 years ago
10

Which of the following best describes atoms? *

Chemistry
1 answer:
Masja [62]3 years ago
6 0

a. Smallest basic units of matter

\boxed{ \boxed{ \bf{ \bigstar \: Extra}}}

<u>Atom</u>: An atom is the smallest particles of a substance which may or may not exist in free state but takes part in chemical reactions.

<u>Molecule</u>: A molecule is a substance which exists in free state but doesn't take part in chemical reactions.

<u>Laws</u><u> </u><u>of</u><u> </u><u>chemical</u><u> </u><u>combination</u><u>:</u><u>-</u>

  • Law of conservation of mass

  • Law of constant proportions

  • Law of multiple proportions

  • Law of combining volumes

  • Law of reciprocal proportions
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A substance releases 2,192 J of heat, changing its temperature from 50 degrees C to 5 degrees C. The mass of the substance is 73
Gre4nikov [31]

The specific heat capacity of the given substance is -0.66 J/g°C.

<u>Explanation:</u>

The heat absorbed by any substance is the product of its mass, specific heat capacity and change in temperature.

q = m × c × ΔT

m is the mass in grams

q = amount of heat released or absorbed in J

ΔT = change in temperature in °C = 5 -50 = -45°C

c = specific heat capacity in J/g°C

c = $\frac{q}{m \times dT}

Plugin the values, we will get,

c = $\frac{2192 }{73.9 \times-45}

= -0.66 J/g°C

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