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3 years ago

What is a pure substance that contains atoms of more than one element called

Chemistry

2 answers:

mestny [16]3 years ago

8 0

Explanation:

A compound is defined as a substance formed due to chemical combination of two different elements which are present in a fixed ratio by mass.

A compound is a pure substance as it can be broken down into its constituent elements.

For example, $MgCl_{2}$ is a pure substance and it can be broken down into magnesium and chlorine ions.

Thus, we can conclude that a pure substance that contains atoms of more than one element called compound.

Dominik [7]3 years ago

3 0

An element is a pure substance that consists entirely of one pure substance. Compounds are a substance that is formed by two or more elements. Elements are composed of the same atomic atoms/molecules. This means that every particle in an element has the same number of protons in the nucleus.

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What is the half-life of an isotope that decays to 12.5% of its original activity in 19.8 hours?

katen-ka-za [31]

$x= x_{0} e^{kt} ,where~ x ~is~ the ~ |amount\ of \material\ at\ any~~time~t
$
$and~ x_{0} ~the~original~amount.$
$when~x= \frac{12.5}{100} x_{0} }= \frac{125}{1000} x_{0}$
$\frac{x}{ x_{0} } = \frac{125}{1000}= \frac{1}{8}$
$when t=19.8 hrs,
x= x_{0} e^{19.8 k}, 
 \frac{x}{ x_{0} } = e^{19.8 k}, 
 \frac{1}{8} = e^{19.8k} ,
ln \frac{1}{8} =19.8 k,
$
$ln1-ln8=19.8k,
0-ln 2^{3} =19.8 k,
-3 ln2=19.8k
k= \frac{-3 ln2}{19.8} = \frac{- ln 2}{6.6}$ $x= x_{0} e^{ \frac{-ln2}{6.6}t } ,
 \frac{x}{ x_{0} } = e^{ \frac{- ln 2}{6.6}t } 
$ $\frac{1}{2} = e^{ \frac{- ln2}{6.6}t } = \frac{1}{ e^{ \frac{ln 2}{6.6} t} } ,
2= e^{ \frac{ln2}{6.6}t } ,
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8 0

4 years ago

Avogadros number is used to determine the number of subatomic particles in an atom. True or false

Yuliya22 [10]

Answer:

False

Explanation:

The Avogadro's number is not used to determine the number of subatomic particles in an atom.

Subatomic particles of an atom are the protons, neutrons and electrons.

The protons are the positively charged particles in an atom

Neutrons do not carry any charges

Electrons carry negative charges.

The number of protons, neutrons and electrons in an atom are experimentally determine using spectrometric techniques.

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3 years ago

Can a particle be a single atom? Explain...

pogonyaev

no, it contains 3 basic particles. (protons, electrons, neutrons)

hope this helped

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As the temperature increases, what happens to the solubility of a gas?

kati45 [8]

Not increases it DECREASES because the gas will have too much energy to dissolve in the solution

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3 years ago

Resistance of a material being scratched in known as

Nastasia [14]

Friction is the answer

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