If the moon is on the other side of the earth, the water is getting pulled back because of the gravity force but if the moon is on the same side of the beach it's high tide.
Answer:
24g of carbon
Explanation:
From Avogadro's hypothesis, we understood that 1mole of any substance contains 6.02x10^23 atoms. This gives us a background understanding that 1mole of carbon also contains 6.02x10^23 atoms.
1 mole of carbon = 12g
If 12g of carbon contains 6.02x10^23 atoms,
then Xg of carbon will contain 1.204 x 1024 atoms i.e
Xg of carbon = (12x1.204x10^24)/6.02x10^23 = 24g
Therefore, 24g of carbon contains 1.204x10^24 atoms
Answer:
Presence of impurities in the product.
Explanation:
Laboratory experience has shown that the percent yield obtained from a reaction may be greater than 100% if the product obtained from the reaction contains impurities that causes its mass to be greater than it actually would be if the product was pure.
A typical impurity that may be present in a product is the solvent used. This can be removed by evaporation of the solvent or by washing the product thoroughly.
Reaction of solid products with gases may also increase the percentage yield above 100%.
Answer:
Metal
Element: Calcium
Valency: 2
Explanation:
To find the element, let's use the periodic table. (Look below)
We already went past 3 shells, just need the 2 electrons after it.
Just skip to the 4th row and count 2 to the right
We end up at Calcium.
Calcium is a metal and we're also on the alkaline earth metals column.
Calcium will need to lose 2 electrons to reach stability, so the valency is 2.