Answer:
The cube of gold will have the greatest mass.
Explanation:
All the cubes have the same size, so they have the same volume.
The property that varies among the cubes is density.
D = m/V Multiply both sides by V and transpose.
m = DV
Since V is a constant, m ∝ D.
That is, the cube with the greatest density will have the greatest mass.
The observed densities are
Iron = 7.9 g/cm³
Brass = 8.5 g/cm³
Lead = 11.4 g/cm³
Gold = 19.3 g/cm³
Gold has the greatest density, so the cube of gold has the greatest mass.
Answer:
The answer would be Uranium-238
Explanation:
It's the only one that lasts longer than 40,000 years
<span>We can solve this problem by assuming that the decay of
cyclopropane follows a 1st order rate of reaction. So that the
equation for decay follows the expression:</span>
A = Ao e^(- k t)
Where,
A = amount remaining at
time t = unknown (what to solve for) <span>
Ao = amount at time zero = 0.00560
M </span><span>
<span>k = rate constant
t = time = 1.50 hours or 5400 s </span></span>
The rate constant should
be given in the problem which I think you forgot to include. For the sake of
calculation, I will assume a rate constant which I found in other sources:
k = 5.29× 10^–4 s–1 (plug in the correct k value)
<span>Plugging in the values
in the 1st equation:</span>
A = 0.00560 M * e^(-5.29 × 10^–4 s–1 * 5400 s )
A = 3.218 <span>× 10^–4 M (simplify
as necessary)</span>
Answer:
Number of protons = 52, Number of electrons = 52, Number of neutrons = 76
Explanation:
Answer:
10
Explanation:
pH is defined as the negative logarithm of the concentration of hydrogen ions.
Thus,
pH = - log [H⁺]
Thus, from the formula, more the concentration of the hydrogen ions or more the acidic the solution is, the less is the pH value of the solution.
Thus, solution with pH = 3 will be more acidic than solution with pH =4
Thus, concentration of the [H⁺] when pH =3
3 = - log [H⁺]
[H⁺] = 10⁻³ M
For pH = 4, [H⁺] = 10⁻⁴ M
<u>hence, pH = 3 is 10 times more acidic than pH = 4</u>
