Chemistry, 04.07.2019 20:50 Shisuuu

What are the different ways to represent compounds? check all that apply. check all that apply. the kolbe formula a structural formula a ball model an empirical formula a space-filling model a molecular formula a ball and stick model a cylindric model?

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Answer from: mervindavisk

Compounds can be exemplified in two main ways. These are Chemical Formula and Molecular Model.

Chemical formula includes:

Structural formula – this is a formula that shows the arrangement of atoms in the molecule of a compound.

Molecular formula – this is a formula giving the number of atoms of each elements to present in one molecule of a specific compound.

Empirical formula – this is a formula giving the proportions of elements present in a compound.

Molecular model:

Space-filling model - represents atoms fill the space between each other.

Ball and stick model - represents atoms as balls and chemical bonds as sticks.

Remember that a compound is a substance that is formed when two or more elements are bonded together.

Answer from: trint4

The different ways to represent compounds:

a structural formula, an empirical formula, a space-filling model, a molecular formula and a ball stick model

Further explanation

The empirical formula (EF) is the smallest atomic ratio of the constituent elements.

The empirical formula shows the simplest comparison of the molecules making up the molecule

The Molecular formula (MF) is a formula that shows the number of atomic elements that make up a compound.

$\large{\boxed{\bold{(EF)n=MF}}}$

The empirical formula can be identical to the molecular formula. Ion compounds only have an empirical formula and do not have a molecular formula because ion compounds are formed from positive ions and negative ions, not from molecules.

Structural formulas are depictions of bonds between atoms in a molecule. The structural formula is obtained from the Lewis formula by replacing each pair of electrons with a line. From this structural formula, you can see a single bond or a double bond

A ball-and-stick model describes an atom as a ball and its bond as a stick

A space-filling molecular model describes molecules like a ball-and-stick model but without the stick

Whereas the Kolbe formula, a ball model, and a cylindric model are unknown

Learn more

chemical bond

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ionic bonding

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electron dots

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Keywords: a structural formula, an empirical formula, a space-filling model, a molecular formula, a ball stick model

What are the different ways to represent compounds? check all that apply. check all that apply. the

Answer from: Quest

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = $25^oc$ = 298 k $)0^oc=273kelvins$

$o_3+3no\rightarrow 3no_2,\delta h_{reaction}=? [/)</p><p>[tex]\delta h_{no}=90.4kj/mol$

$\delta h_{no_2}=33.85kj/mol$

$\delta h_{o_3}=142.2kj/mol$

$\delta h_{reaction}=\sum \delta h_{products}-\sum\delta h_{reactants}=3\times\delta h_{no_2}-(3\times \delta h_{no}+\delta h_{o_3})$

$\delta h_{reaction}=33.85-(90.4+142.2)=-311.85kj/mol$

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

$v_{no}=12.00 l,v_{o_3}=8.50 l$

$pv_{no}=n_{no}rt=1atm \times 12.00 l=n_{no}\times 0.0821 atml/k mol \times 298 k$

$n_{no}=0.49 moles$

$pv_{o_3}=n_{o_3}rt=1atm \times 8.50 l=n_{o_3}\times 0.0821 atml/k mol \times 298 k$

$n_{o_3}=0.34 moles$

according to reaction 3 moles no are reacting with 1 mol of $o_3$ ,then 0.49 mol of no will react with $\frac{1}{3}\times 0.49$ moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and $o_3$ is an excessive reagent.