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maksim [4K]
3 years ago
11

2. Combine lead (II) nitrate and potassium iodide solutions. Pb(NO3)2+ Kl →

Chemistry
1 answer:
Shtirlitz [24]3 years ago
7 0

Answer:

Pb(NO3)2 + KI = KNO3 + PbI2

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Nuclear decay occurs according to first-order kinetics. What is the half-life of europium-152 if a sample decays from 10.0 g to
djyliett [7]

Answer:

13.5 years

Explanation:

Initial Concentration [Ao] = 10g

Final Concentration [A] = 0.768g

Time t= 50 years

Half life t1/2 = ?

These quantities are related by the following equations;

ln[A] = ln[Ao] - kt ......(i)

t1/2 = ln(2) / k ...........(ii)

where k = rate constant

Inserting the values in eqn (i) and solving for k, we have;

ln(0.768) = ln(10) - k (50)

-0.2640 = 2.3026 - 50k

50k = 2.3026 + 0.2640

k = 2.5666 / 50 = 0.051332

Insert the value of k in eqn (ii);

t1/2 = ln(2) / k

t1/2 = 0.693 / 0.051332 = 13.5 years

4 0
4 years ago
Which is the correct electron dot diagram for krypton (Kr)?
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Krypton is in group 18, and so it has 8 valence electrons. B is the answer
4 0
4 years ago
What is the difference between a helium atom and an alpha particle​
artcher [175]

Answer:

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Explanation:

4 0
3 years ago
Question (ii) answer
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The student stirs it because he wants the reaction to take place more quickly.
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3 years ago
Select all of the factors that influence GRAVITATIONAL potential energy (Lesson 3.10):
azamat

Answer:

C) Mass

E) Distance from ground

Explanation:

The factors that influence the gravitational potential energy are mass and distance from the ground or height.

Gravitational potential energy is potential energy of a body in relation to that of another under the influence of gravity.

  Mathematically;

      Gravitational potential energy  = mgh

where m is the mass

           g is the acceleration due to gravity

           h is the height

7 0
3 years ago
Read 2 more answers
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