Answer:
c.
Explanation:
A serial dilution is a dilution that is made fractionated. The stock solution is diluted, then this now solution is diluted, and then successively. The final dilution is the multiplication of the steps dilutions.
The representation of the dilution is v/v (volume per volume) indicates how much of the stock solution is in the total volume of the solution. So 1/5 indicates 1 mL to 5 mL of the solution. If the final volume must be 1 mL, then the stock solution must be 0.2 mL (0.2/1 = 1/5), and the volume of the solvent is 1 mL - 0.2 = 0.8 mL.
The second solution is done with a dilution of 1/10 or 1 mL of the first solution in 10 mL of the total solution. Because the solution has 1 mL, then the volume of the first solution must be 0.1 mL (0.1/1 = 1/10), and the volume of the solvent that must be added is 1 mL - 0.1 mL = 0.9 mL.
Answer:
1.47 mol/L
Explanation:
Molarity is given as,
Molarity = Moles / Vol in L ------- (1)
Moles of CaCl₂,
Moles = Mass / M.Mass
Moles = 535 g / 110.98 g/mol
Moles = 4.82 mol
Now, putting values in eq. 1.
Molarity = 4.82 mol / 3.28 L
Molarity = 1.47 mol/L
I believe the answer to your question is C
Answer:
Square, quadrilateral, rectangle, and a parallelogram
Explanation:
A square has 4 right angles, and 4 parallel sides.
A quadrilateral has 4 sides, and anything with 4 sides is that. A square, rectangle, and a parallelogram qualify as a quadrilateral.
A rectangle has 4 right angle, and 2 pairs of parallel sides. A square is a special type of rectangle.
A parallelogram has only 2 parallel sides, and the angle doesn't matter.
Hope this helps! :)
- What qualifies as a quadrilateral,
- Rectangle
- 4 sided shapes
- parallelogram
- square
- What qualifies as a rectangle
- Square
- What qualifies as a parallelogram
- A shape with 2 pairs of parallel sides
The life= 28*2 =56
100% -78%=22%
56*22/100 = 12,32 years to decay 22% of it s original amount / and there remains 78 % of the original amount .
