Water is made of only one molecule which can be chemically separated into hydrogen and oxygen. The answer is D.
It's called frequency, its usually stated Hertz
The answer is: the percent composition of chromium is 20.52%.
Ar(Cr) = 52; atomic mass of chromium.
Mr(BaCrO₄) = 253.3; molecular mass of barium chromate.
ω(Cr) = Ar(Cr) ÷ Mr(BaCrO₄) · 100%.
ω(Cr) = 52 ÷ 253.3 ·100%.
ω(Cr) = 20.52%; the percent composition of chromium in barium chromate.
Answer:
pt1
The half-life of the element is 1,600 years.
pt2
k = ln(2)/(t1/2) = 0.693/(t1/2).
Where, k is the rate constant of the reaction.
t1/2 is the half-life of the reaction.
∴ k =0.693/(t1/2) = 0.693/(1,600 years) = 4.33 x 10⁻⁴ year⁻¹.
kt = ln([A₀]/[A]),
where, k is the rate constant of the reaction (k = 4.33 x 10⁻⁴ year⁻¹).
t is the time of the reaction (t = ??? year).
[A₀] is the initial concentration of the sample ([A₀] = 312.0 g).
[A] is the remaining concentration of the sample ([A] = 9.75 g).
∴ t = (1/k) ln([A₀]/[A]) = (1/4.33 x 10⁻⁴ year⁻¹) ln(312.0 g/9.75 g) = [8,000 year].
-Hops
Answer: pH is 1.6
Explanation: Explanation: HCl is strong acid and it protolyzes totally:
HCl + H2O ⇒ H3O+ + Cl-
Concentrations are same: [H3O+] = c(HCl)
pH = - log[H3O+] = - log(0.025) = 1.60
