Chemistry: What is the percent activity of a radioactive sample Science Assignment Help

Chemistry: What is the percent activity of a radioactive sample Science Assignment Help. Chemistry: What is the percent activity of a radioactive sample Science Assignment Help.

What is the percent activity of a radioactive sample (relative to its original activity) that has undergone four half-lives of decay?

Select one:

a. 6.25%

b. 12.5%

c. 25.0%

d. 75.0%

Chemistry: What is the percent activity of a radioactive sample Science Assignment Help[supanova_question]

Need chemistry help with the half-life of phosphorus-33 is 25 days. Science Assignment Help

15. The half-life of phosphorus-33 is 25 days. How much of a 128-g sample will remain after 150 days?

Select one:

a. 1.0 g

b. 2.0 g

c. 4.0 g

d. 8.0 g

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Need chemistry help with a bond in which both electrons of the bond are donated by one atom Science Assignment Help

A bond in which both electrons of the bond are donated by one atom is called ____.

Select one:

a. a polar covalent bond

b. a coordinate covalent bond

c. an ionic bond

d. a double bond

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Chemistry: What is the cell reaction for the following electrochemical cell? Cu | Cu2+ Science Assignment Help

What is the cell reaction for the following electrochemical cell?

Cu | Cu²⁺(aq) || Ni²⁺(aq) | Ni

Select one:

a. 2Cu(s) + Ni²⁺(aq) → Ni(s) + 2Cu²⁺(aq)

b. Cu(s) + Cu²⁺(aq) → Ni(s) + Ni²⁺(aq)

c. Cu(s) + Ni²⁺(aq) → Ni(s) + Cu²⁺(aq)

d. 2Ni(s) + Cu²⁺(aq) → Cu(s) + 2Ni²⁺(aq)

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need chemistry help with the hydronium-ion concentration Science Assignment Help

What is the hydronium-ion concentration of a 0.30 M solution of HCN (K_a= 4.9´10^–10) at 25°C?

Select one:

a. 1.7 ´ 10^–4 M

b. 3.4 ´ 10^–6 M

c. 2.2 ´ 10^–6 M

d. 1.2 ´ 10^–5 M

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Need chemistry help: What is the molecular geometry around an atom in a molecule or ion Science Assignment Help

What is the molecular geometry around an atom in a molecule or ion which is surrounded by zero lone pairs of electrons and four single bonds.

Select one:

a. tetrahedral

b. linear

c. bent

d. trigonal pyramidal

Need chemistry help: What is the molecular geometry around an atom in a molecule or ion Science Assignment Help[supanova_question]

Use a calculator to evaluate the expression, correct to four decimal places. (a) Mathematics Assignment Help

Use a calculator to evaluate the expression, correct to four decimal places.

(a)

ln 6

(b)

ln 26.8

(c)

ln(3 +

)

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Use a calculator to evaluate the expression, correct to four decimal places. (a) Mathematics Assignment Help

Use a calculator to evaluate the expression, correct to four decimal places.

(a)

log 60

(b)

log

(c)

log(9

)

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Need chemistry help with 19 Cathodic protection as a results Science Assignment Help

Cathodic protection results when

Select one:

a. iron is attached to a more active metal

b. iron is painted to protect it from corrosion

c. iron is made amphoteric

d. iron is amalgamated with mercury

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Need chemistry help with 18 Cathodic protection as a result Science Assignment Help

Cathodic protection results when

Select one:

a. iron is attached to a more active metal

b. iron is painted to protect it from corrosion

c. iron is made amphoteric

d. iron is amalgamated with mercury

[supanova_question]

Chemistry: What is the percent activity of a radioactive sample Science Assignment Help