Objects that allow all of the light to pass through them is said to be transparent. One can clearly see through the transparent objects. Objects that allow only some light to pass through them is said to be translucent. One can partially see through the translucent objects whereas objects that do not allow any light to pass through them is said to be opaque. One cannot see through the opaque objects at all.
Erbium is a chemical element with atomic symbol, 
which belongs to the period 6 with atomic number 68. It is a lanthanide, which is silvery-white solid metal in nature. The metals are opaque to visible lights.
Hence, erbium is opaque.
Answer:
iron
Explanation:
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Answer:
0.89 g of ethane
Explanation:
The balanced reaction equation is
C2H6(g) + 7/2 O2(g) -----------> 2CO2(g) + 3H2O(g)
From this balanced reaction
30g of ethane yields 54g of water
Therefore mass of ethane necessary to obtain 1.61g of water we have:
30 × 1.61/54 = 0.89 g of ethane
cities have factories , more people and no water around .
Answer:
0.9 liters of 4.0 M NaOH solution will react with 1.8 moles of sulfuric acid.
Explanation:
According to reaction, 1 mole of sulfuric acid reacts with 2 moles of sodium hydroxide.
Then 1.8 moles of sulfuric acid will react with:
moles of NaOH.
Molarity of NaOH = 4.0 M
Moles of NaOH= n = 3.6 mol
Volume of NaOH = V
0.9 liters of 4.0 M NaOH solution will react with 1.8 moles of sulfuric acid.
