Answer:
See explanation below
Explanation:
To get this, we need to apply the general expression for half life decay:
N = N₀e(-λt) (1)
Where:
N and N₀ would be the final and innitial quantities, in this case, masses.
t: time required to decay
λ: factor related to half life
From the above expression we need λ and t. To get λ we use the following expression:
λ = t₁₂/ln2 (2)
And we have the value of half life, so, replacing we have:
λ = 8.04 / ln2 = 11.6
Now, we can replace in (1) and then, solve for t:
0.75 = 40 exp(-11.6t)
0.75 / 40 = exp(-11.6t)
ln(0.01875) = -11.6t
-3.9766 = -11.6t
t = -3.9766 / -11.6
<h2>
t = 0.34 days</h2><h2>
</h2>
Answer:
sodium carbonate decahydrate
Explanation:
Usually we would the molar mass of Na2CO3 x 10 H2O. This is where the name comes from.
Answer:
Graduated cylinder
Explanation:
A tall skinny cylinder used to measure volumes. It is generally a more accurate way to measure volume than a typical beaker or flask. Mortar and pestle - A mortar and pestle are used to crush and grind solids into a powder. The mortar is a bowl and the pestle is a small club-shaped tool.
36 sandwiches
Since you have the same amount of ingredients, you have to divide the number by the larger number because it is being decreased at a faster rate
180/5=36
He will run out of honey ham before the cheese
Missing question: <span>What will happen if we combine the solution of sodium iodide and the solution of lead(II) nitrate?
Chemical reaction 1: Pb(NO</span>₃)₂(s) → Pb²⁺(aq) + 2NO₃⁻(aq).
Chemical reaction 2: 2NaI(aq) + Pb(NO₃)₂(aq) → PbI₂(s) + 2NaNO₃(aq).
Ionic reaction:
2Na⁺(aq) + 2I⁻(aq) + Pb²⁺(aq) + 2NO₃⁻(aq) → PbI₂(s) + 2Na⁺(aq) + 2NO₃⁻(aq).
Net ionic reaction: 2I⁻(aq) + Pb²⁺(aq) → PbI₂(s).
