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3 years ago

Two forms of solid carbon, diamond and graphite, differ in their physical properties due to the differences in their

Chemistry

2 answers:

Dominik [7]3 years ago

8 0

Answer;

- Crystal structure

Explanation;

-Diamond and graphite are allotropes of carbon, they differ in physical properties.

-In graphite, carbon atoms are covalently bonded to form sheets or what we call hexagonal layers, and these sheets are held together by weak inter-molecular forces called vander waal forces. This makes the layers to slide over each other , a property that makes graphite soft and slippery.

-In Diamond, carbon atoms are bonded by strong covalent bonding forming a tetrahedron shaped solid of Diamond which makes it a very hard solid.

kodGreya [7K]3 years ago

7 0

(1) atomic numbers
(2) crystal structures
(3) isotopic abundances
(4) percent compositions

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3 years ago

If a substance has a half life of 58 years and starts with 500 g radioactive, how much remains radioactive after 30 years?

Vilka [71]

Answer:

A = 349 g.

Explanation:

Hello there!

In this case, since the radioactive decay kinetic model is based on the first-order kinetics whose integrated rate law is:

$A=Ao*exp(-kt)$

We can firstly calculate the rate constant given the half-life as shown below:

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Therefore, we can next plug in the rate constant, elapsed time and initial mass of the radioactive to obtain:

$A=500g*exp(-0.012year^{-1} *30year)\\\\A=349g$

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