Reduces from birth till old age is the answer because if you look at the chart, you can see that both the percentages and hours of total sleep time decrease as humans get older.
Answer:
chivalry and the romance of nomadic life. the life of Muhammad. a strict adherence to religious themes.
Explanation:
Sorry if its wrong
Answer:If we dissolve NaF in water, we get the following equilibrium:
text{F}^-(aq)+text{H}_2text{O}(l) rightleftarrows text{HF}(aq)+text{OH}^-(aq)
The pH of the resulting solution can be determined if the K_b of the fluoride ion is known.
20.0 g of sodium fluoride is dissolve in enough water to make 500.0 mL of solution. Calculate the pH of the solution. The K_b of the fluoride ion is 1.4 × 10 −11 .
Step 1: List the known values and plan the problem.
Known
mass NaF = 20.0 g
molar mass NaF = 41.99 g/mol
volume solution = 0.500 L
K_b of F – = 1.4 × 10 −11
Unknown
pH of solution = ?
The molarity of the F − solution can be calculated from the mass, molar mass, and solution volume. Since NaF completely dissociates, the molarity of the NaF is equal to the molarity of the F − ion. An ICE Table (below) can be used to calculate the concentration of OH − produced and then the pH of the solution.
Explanation:
Answer:
Number 6
Explanation:
A reflex action is an involuntary action and nearly instantaneous movement in response to a stimulus.
Hey there!:
Balanced Equation , for the reaction:
3 H₂SO₄(aq) + 2 Fe(s) → Fe₂(SO₄)₃(aq) + 3 H₂(g)
2 moles Fe ---------------------------------- 3 moles H₂
0.250 moles Fe ---------------------------- ( moles H₂ ) ??
____________________________________________
moles H₂ = 0.250 × 3 / 2
moles H₂ = 0.75 / 2
moles = 0.375 moles of H₂
Hope this helps!
