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S_A_V [24]
2 years ago
7

PLEASE HELP ME WITH THIS!!!

Chemistry
2 answers:
Alex Ar [27]2 years ago
4 0

Answer:

D:PS

Explanation:

Looking at the table we can see that PS floats on dish soap and sinks in water.

Dmitriy789 [7]2 years ago
3 0
The answer is D. PS!!!!!!
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6th grade science i mark as brainliest​
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Ca(OH)2 + H3PO4 = Ca3(PO4)2 + H2O
larisa [96]
Make a quick chart with each element represented, and count them up. HINT - leave the polyatomic anions together - in this case, PO4

Left      Right
1     Ca  3
2      O   1
5      H   2
1    PO4 2

Begin by balancing like finding common denominators of fractions - apply to both sides:
I started by adding a 2 in front of H3PO4 on the left, them 6 in front of H2O on the right. Last, a 3 in front of Ca (OH)2. Then, re-count using the chart format to make sure you're right.

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3 years ago
What is the molarity of a solution prepared by dissolving 10.7 g NaI in 0.250 L?0.0714
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One of the radioactive isotopes used in medical treatment or analysis is chromium-51. The half-life of chromium-51 is 28 days. H
Goryan [66]

Answer : The time required for decay is, 84 days.

Explanation :

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First we have to calculate the rate constant, we use the formula :

k=\frac{0.693}{t_{1/2}}

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k=0.0248\text{ days}^{-1}

Now we have to calculate the time required for decay.

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

k = rate constant

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a = let initial activity of the sample = 100

a - x = amount left after decay process  = 12.5

Now put all the given values in above equation, we get

t=\frac{2.303}{0.0248}\log\frac{100}{12.5}

t=83.9\text{ days}\approx 84\text{ days}

Therefore, the time required for decay is, 84 days.

7 0
3 years ago
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