A rod of a neutron-absorbing substance used to vary the output power of a nuclear reactor.
Answer: D
Explanation:
im not sure if its wright or not
Answer:
1. Alkalinity
2. True
3. Red
Explanation:
1. 8-14, which are the bases, are alkaline
2. Salt lowers the melting/freezing point of water
3. Blue --> Red is Acid
Molarity: M = #moles of solute / liters of solution
# moles = mass / molar mass
Molar mass calculation
Barium hydroxide = Ba (OH)2
Atomic masses
Ba = 137.4 g/mol
O=16 g/mol
H=1 g/mol
Molar mass of Ba (OH)2 = 137.4 g/mol + 2*16g/mol + 2*1 g/mol = 171.4 g/mol
# mol = 25.0g/171.4 g/mol = 0.146 mol
For the volume of water use the fact that the density is 1g/ml., so 120 g = 120 ml = 0,120 liters.
M = 0.146mol / 0.120 liters = 1.22 mol/liter
