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3 years ago

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Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of Pb and H+ in the bal

anced reaction?
Pb2+(aq) + NH+4(aq) --> Pb(s) + NO-3(aq)

1 answer:

Tanzania [10]3 years ago

8 0

Answer:

kujgedyjmnyged\jmngv\gedkjmyten

Explanation:

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What is the half-life of an isotope that decays to 6.25% of its original activity in 18.9 hours?

inessss [21]

Radioactive material obeys 1st order decay kinetics,
For 1st order reaction, we have
k = $\frac{2.303}{t}Xlog \frac{\text{initial conc.}}{\text{final conc.}}$
where, k = rate constant of reaction

Given: Initial conc. 100, Final conc. = 6.25, t = 18.9 hours

∴ k = $\frac{2.303}{18.9} X log \frac{100}{6.25}$ = 0.1467 hours^(-1)

Now, for 1st order reactions: half life = $\frac{0.693}{k} = \frac{0.693}{0.1467}$ = 4.723 hours.

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3 years ago

Methods used by scientists

svet-max [94.6K]

Answer:

scientific method

Explanation:

they use this alot

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3 years ago

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Which of the following best describes a Lewis base?

PolarNik [594]

Not 100% sure but I believe it is C.

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3 years ago

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Describe the mass of the reactants and products given the balanced chemical reaction.

Andru [333]

Answer:

The mass of the reactants equals the mass of the products.

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3 years ago

Iron(III) oxide is formed when iron combines with oxygen in the air.

Alisiya [41]

Answer:

Mass = 9.58 g

Explanation:

Given data:

Mass of Fe₂O₃ formed = ?

Mass of Fe = 6.7 g

Solution:

Chemical equation:

4Fe + 3O₂ → 2Fe₂O₃

Number of moles of Fe:

Number of moles = mass/molar mass

Number of moles = 6.7 g/ 55.8 g/mol

Number of moles = 0.12 mol

now we will compare the moles of Fe and Fe₂O₃.

Fe : Fe₂O₃

4 : 2

0.12 : 2/4×0.12 = 0.06 mol

Mass of Fe₂O₃:

Mass = number of moles × molar mass

Mass = 0.06 mol × 159.69 g/mol

Mass = 9.58 g

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3 years ago