Answer:
Ca, Zn, Ni, Al, Fe
Explanation:
The activity series is an arrangement of metals in order of decreasing reactivity.
Metals that are high up in the activity series are very reactive. They displace metals that are lower in the activity series from an aqueous solution of their salts.
The metals; Ca, Zn, Ni, Al, Fe are all above Pb in the activity series hence they will cause Pb2+ ions to come out of solution as solid Pb.
Answer:If a bouncing ball has a total energy of 20 J and a kinetic energy of 5 J, the ball’s potential energy is 15J.
If the kinetic energy of the ball decreases, then the potential energy will Increase.
Explanation:
The answer is (3) 11,460 y. For this problem, you must know that the half life of C-14 is 5740 y and that nuclear decay processes are first order reactions (which means that the half life remains constant). For 25.00g to be left of a 100.0g sample, two half life must have elapsed (100*0.5*0.5=25). Each half life is 5730 y, so the total time elapsed is 5730 * 2 = 11,460 y.
Molar mass sucrose :
C12H22O11 = 342.29 g/mol
number of moles <span>of the solute :
</span>
n = mass solute / molar mass
n = 17.1 / 342.29
n = 0.05 moles
Volume in liters :
250 mL / 1000 = 0.25 L
therefore :
Molarity = moles of solute / volume
Molarity = 0.05 / 0.25 => 0.2 mol/L
Answer:
Number of mole = 0.0342 mole of Boron
Explanation:
One mole of a substance is equal to 6.022 * 10^23 units of that substance.
According to the definition in chemistry, mole is defined as the mass of substance containing the same number of fundamental units.
To calculate the number of mole, we will use the formula
n = m/Mm
n = number of mole
m = number of mass
Mm = number of molar mass
Molar mass of boron = 10.811g/mol
Mass of boron = 3.70 * 10^-1g
Using the formula
n = m/Mm
n = 3.70 * 10^-1 / 10.811g/mol
n = 0.0342 mole
