Answer:
Which are positive? D.
Which are negative? A. B. C.
Explanation:
Generally, entropy can be defined as the degree of randomness of a system. The entropy of any system increases with an increase in the number of moles of the system. Entropy also increases when there is a change of state from solid to liquid or liquid to gas. Therefore for the systems in the given question:
A pond freezes in winter
The degree of disorderliness decrease because there is a change of state from liquid to solid. Thus, ΔSsys is negative.
Atmospheric CO2 dissolves in the ocean
There is also decrease in randomness, thus, ΔSsys is negative.
An apple tree bears fruit
There is also decrease in randomness, thus, ΔSsys is negative.
Answer:
b. The shorter the half-life, the more dangerous the radioisotope.
Answer:
YES THE BULB WILL GLOW.
Explanation:
BECAUSE THE CIRCUIT UPPER AREA IS MADE OF PLASTIC SO THE PLASTIC CONDUCTS THE ELECTRICITY SO THE BULB WILL GLOW.
The most likely formula for an oxide formed between group 1a atom X and oxygen would be
X2O. - X is group 1a atom.
Answer:
1.204 x 10²⁴ atoms of oxygen in 1 mole of CO₂
Explanation:
1 mole of CO₂ contains 6.02 x 10²³ molecules of CO₂
1 molecule of CO₂ contains 2 atoms of oxygen
Therefore, Atoms of oxygen in 1 mole of CO2 => 6.02 x 10²³ molecules CO₂ x
2 atoms oxygen / molecule CO₂ = 2 X 6.02 X10²³ atoms of oxygen = 1.204x10²⁴ atoms of oxygen in 1 mole CO₂
