Answer:
On the periodic table, metals are separated from nonmetals by a zig-zag line stepping through carbon, phosphorus, selenium, iodine, and radon. ... Elements just to the left of the line may be termed metalloids or semimetals and have properties intermediate between those of the metals and nonmetals.
Explanation:
Answer: 1.0 mol/dm3
Explanation:
Given that:
Amount of moles = 0.25 moles
Volume = 250 millliters of solution
Convert milliliters to liters
If 1000 milliliters = 1 liter
250 milliliters = (250/1000) = 0.25 L
Recall that 1 liter = 1dm3
so, 0.25 liters = 0.25 dm3
Now, molarity is calculated by dividing the amount of a substance by the volume of the solution.
i.e Molarity = (Amount in moles/volume in dm3)
Molarity = (0.25 moles / 0.25 dm3)
= 1.0 mol/dm3
Thus, the molarity of the solution is 1.0 mol/dm3
<h3>
Answer:</h3>
D. Multiply the atomic mass of fluorine by 1.25
<h3>
Explanation:</h3>
<u>We are given;</u>
We need to identify the formula that shows the equivalent in mass
- We need to know the relationship between mass of an element, its atomic mass and the number of moles;
- That is; Number of moles = Mass of the element ÷ Atomic mass
Therefore;
Mass of the element = Number of moles × atomic mass
- Thus, in this case, to get mass we will multiply number of moles by atomic mass of Fluorine.
- That is, multiply atomic mass of fluorine by 1.25 moles .
A positive effect of organic farming on abundance was found in 96 of 117 studies
Answer:
0.02
Explanation:
Molecular mass of water= 2×1+1×16=18g
=2×1+1×16=18g
For 90g178.2g water nₐ =5
Molecular mass of glucose 6×12+12×1+6×16=180g
For 18g glucose nb =0.1
Now, X B = 0.1 / 0.1 + 5=0.0196 ~0.02
