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4 years ago

Which pure substance can be classified as an element? -H2 -NO3 -NaCl -H2SO4

Chemistry

2 answers:

Yanka [14]4 years ago

8 0

It can only be made up of one atom

alukav5142 [94]4 years ago

6 0

An element is made up of only one kind of atom.
So H2 is the element. Why? because H2 is made up of only one kind of atom, hydrogen atoms.

- Just as a side note, compounds (made up of atoms from more than one element) are also considered pure substances.

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A mass spectrum of an organic compound shows the relative abundances of M to be 40.58% and M 1 to be 7.022%. Assuming the peaks

sveticcg [70]

Answer:

The number of carbon atoms in the organic compound is 16.

Explanation:

The relative intensity of M + 1 peak (relative to M = 100) in organic compounds can be predicted by the following formula:

[M + 1] = (number of C x 1.07) ---------------------------------------------------- (1)

This formula can also be used to determine the number of carbon from the given intensity. But first, the intensity of [M + 1] relative to [M] = 100 needs to be determined, for which, consider the following calculations,

$[M+1]=(\frac{M+1}{M}) (100)$

$[M+1]=(\frac{7.022}{40.58}) (100)$

$[M+1]=17.30$

Using equation 1 we get,

$number of C=\frac{[M+1]}{1.07}$

$number of C=\frac{17.3}{1.07}\\number of C = 16.168$

or number of C = 16

The remaining value, 0.168, can be due to the isotopes of hydrogen and oxygen in the organic compound.

7 0

4 years ago

Help one number 46 please

Juli2301 [7.4K]

Say the dereference between the two is that "Exo" means "outside" and "Endo" means "inside" meaning one pulls heat inside (endothermic) and the other expels heat (exothermic)

3 0

3 years ago

The bonds S-S, O-H and Ca-Cl are, respectively, a) nonpolar covalent, polar covalent, ionic polar covalent, b)nonpolar covalent,

Brums [2.3K]

Answer:

nonpolar covalent, polar covalent, ionic

Explanation:

From the question ,

S - S Bond -

Both the atom are same , hence , making a non polar bond , because of no difference between the electronegativity of the atom ,

Hence , the S-S Bond is non polar covalent bond .

O-H bond -

The Oxygen atom is more electronegative than the hydrogen atom , so the bond is polar in nature .

And as the bond is formed by sharing ,

Therefore ,

O-H bond is polar covalent bond .

Ca-Cl bond -

Calcium is a metal , whereas , Chlorine is a non - metal , the bond is ionic in nature ,

Hence , Ca-Cl bond is ionic in nature .

7 0

3 years ago

The minimum amount of energy that particles must have in order to react is known as the... what?

Anika [276]

Activation energy

Hope this helps

4 0

3 years ago

Carbon dioxide and water are produced when ethanol, C2H5OH, is burned in oxygen. The number of moles of CO2 that is produced whe

suter [353]

The number of moles of CO₂ that is produced when burning 6.0 mol of ethanol is 12 mol.

<h3>What is Balanced Chemical Equation ?</h3>

The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.

Now we have to write the balanced equation

C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O

We can see that every 1 mole of ethanol we will get 2 mole of CO₂.

So 6.0 mol of ethanol we will get = 6.0 × 2.0

= 12 mol of CO₂

Thus from the above conclusion we can say that The number of moles of CO₂ that is produced when burning 6.0 mol of ethanol is 12 mol.

Learn more about the Balanced Chemical Equation here: brainly.com/question/26694427

#SPJ1

7 0

2 years ago