Answer:
The part that is put in the same time as ruthenium, but has a greater number of atoms than silver.
The answer is "A". Hope this helps.
Answer:
The lake went from a liquid to a solid
Explanation:
Since it was so cold overnight, the temperature of the lake increased to the fact that it turned hard enough to skate on. or The temperature outside was so cold it froze the lake solid
Answer:
Krypton.
Explanation:
By Graham's Law:
Rate 1 / Rate 2 = sqrt M2 / sqrt M1
Molecular Mass for Neon is 20.18
so we have:
38 / 77.5 = sqrt 20.18 / sqrt x where x is the unkown gas.
sqrt x = 9.162
x = 83.94.
This gas is Krypton.
Answer:
(d) 4.5 M
Explanation:
We have 70.0 mL of 3.0-molar Na₂CO₃. The moles of Na₂CO₃ are:
70.0 × 10⁻³ L × 3.0 mol/L = 0.21 mol
There are 2 moles of Na⁺ in 1 mole of Na₂CO₃. The moles of Na⁺ in 0.21 moles of Na₂CO₃ are 2 × 0.21 mol = 0.42 mol
We have 30.0 mL of 1.0-molar NaHCO₃. The moles of NaHCO₃ are:
30.0 × 10⁻³ L × 1.0 mol/L = 0.030 mol
There is 1 mole of Na⁺ in 1 mole of NaHCO₃. The moes of Na⁺ in 0.030 moles of NaHCO₃ are 1 × 0.030 mol = 0.030 mol
The total number of moles of Na⁺ is 0.42 mol + 0.030 mol = 0.45 mol
The total volume is 70.0 mL + 30.0 mL = 100.0 mL
The concentration of Na⁺ is
0.45 mol / 0.1000 L = 4.5 M