3 years ago

Noble gases are... a. Very reactive, b.metals, c.radioactive, or d.unreactive

Chemistry

1 answer:

Andrews [41]3 years ago

4 0

Answer:

d. stable

Explanation:

Noble gases have 8 valence electrons which makes them the least reactive.

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A researcher recorder that a chemical reaction require 2.90 gal water and raised the temperature of the reaction vessel by 57°F.

Ivan

Answer:

10.875L

Explanation:

The problem here is a simple conversion. The conversion is from gal to liters Liter is a SI unit for recording volume as stated in the problem.

Given that:

1 gallon of water = 3.75L

2.90 gallon will be 2.9 x 3.75; 10.875L

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3 years ago

The word elliptical refers to what type of shape?

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The word elliptical refers to an Oval.

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3 years ago

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In a neutral solution, the concentration of H+ is

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Answer:

1 x 10^-7 or 7

Explanation:

pH=-log(H+)

pH+pOH=14

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3 years ago

Reduces frictions creation of thermal energy

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3 years ago

A fossil was analyzed and determined to have a carbon-14 level that is 70 % that of living organisms. The half-life of C-14 is 5

Citrus2011 [14]

Answer: 2948

Explanation:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

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

$k=\frac{0.69}{t_{\frac{1}{2}}}=\frac{0.693}{5730}=1.21\times 10^{-4}years^{-1}$

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 = $1.21\times 10^{-4}years^{-1}$

t = age of sample = ?

a = let initial amount of the reactant = 100

a - x = amount left after decay process = $\frac{70}{100}\times 100=70$

$t=\frac{2.303}{1.21\times 10^{-4}}\log\frac{100}{70}$

$t=2948years$

Thus the fossil is 2948 years old.

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3 years ago