The description of the movement of any chemical element that cycles through the biosphere and plays a role in it's stability,as well as cycling through other earth reservoirs is a Biogeochemical cycle.
Question:
Options
A. The burning splint was extinguished because of a lack of CO2 in the
test tube.
B. The burning splint was extinguished because of a lack of H2O vapor.
C. Decomposition produced CO2 and H2O.
D. Combustion produced O2 and H2O
Answer:
C. The decomposition produced CO₂ and H₂O
Explanation:
Sodium hydrogen carbonate NaHCO₃, also known as baking soda or sodium bicarbonate which is a white crystalline solid that appears as a fine powder, decomposes when heated above 80 °C to form sodium carbonate, water and carbon dioxide as follows;
2NaHCO₃(s) → Na₂CO₃ (s) + H₂O(g) + CO₂(g)
At 400 °C, Na₂CO₃ decomposes further to form more carbon dioxide as follows
Na₂CO₃(s) → Na₂O (s) + CO₂ (g).
Answer:
Yes, given statement is true.
Explanation:
Given that a cylinder of 1000 ml is marked at every 100 ml.
During the test, the student can easily check the volume of liquid so the student's guess is 750 ml true.
With this measurement, we can estimate that 1/10th of 100 ml can be measured.
So, given statement is correct.
The final answer is -322, 320 Joules. The solution for the problem is:
The equation that must be used in this problem is:
U = mCp(Tf-Ti)
where:
U = energy released or absorbed in Joules
m = mass in kg
Cp = specific heat of material in J/kg-C
Tf = final temperature, C
Ti = initial temperature, C
Looking up the Cp of granite gives a value of 790 J/kg-C.
U = 17kg (790 J/kg-C) (21-45)
U = - 322, 320 Joules (negative means heat is released)