Answer:
I believe it’s A
Explanation:
Oxygen and 2 hydrogen atoms make up a water molecule, and so the only logical answer is A.
Molar mass NaOH = 39.997 g/mol
number of moles:
n = mass of solute / molar mass
n = 10.0 / 39.997
n = 0.2500 moles
Therefore:
Molarity = moles of solute / volume ( L )
M = 0.2500 / 2.0
M = 0.13 mol/L
Answer B
Metals on the left side, metalloids on the staircase, nonmetals on right side
Answer:
C. Carbon dioxide
Explanation:
Carbon dioxide is one of the end-product of combustion reactions involving many fuels today.
With the rapid increase in urbanization and technological development, man demand for energy increased tremendously. The discovery of fossil fuels paved the way for the astronomical increase in the concentration of carbon dioxide in the atmosphere. The burning of fossil fuels like coal and oil invovles the process where the carbon atoms present in these fuels combine with oxygen in the air to make CO2. This has resulted in an increase in the concentration of atmospheric carbon dioxide (CO2).
The burning fossil fuels for electricity, industry, heat, and transportation are the major sources of the emossion of carbon dioxide.
Also, the cutting down of trees for paper production, building construction and for the establishment of settlements also increase the concentration of carbon dioxide in the atmosphere. Trees are help remove carbon dioxide from the atmosphere through the process of photosynthesis. However, when these trees are cut down, carbon dioxide accumulates in the atmosphere.
Break until new rock is formed