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mina [271]
3 years ago
6

A pure substance containing only one kind of ____________. an element is always uniform all the way through (homogeneous). an el

ement _____________ be separated into simpler materials (except during nuclear reactions). over 100 existing elements are listed and classified on the ____________________.
Chemistry
1 answer:
Anuta_ua [19.1K]3 years ago
8 0
1. A pure substance containing only one kind of atom.

When a substance has more than one kind of atoms, it would be called a compound. A pure substance can be made out of an element or compound as long as there is only one kind of them, but this question seems to ask about elements. 

2. An element is always uniform all the way through (homogeneous).
An element cannot be separated into simpler materials (except during nuclear reactions).

An element is the simplest form of material that can't be separated. The example would be oxygen(O2) or hydrogen(H2). An element doesn't mean it contains 1 atom because many of the stable structure made of 2 or more atoms. Normally, you cant separate O2 into two oxygen atoms.

<span>3. Over 100 existing elements are listed and classified on the periodic table.
The periodic table used to classify element and make it easier to understand. The classification based on the atomic number and the electron configuration of the elements.
The element in the same column could have similar traits so that they can be put into a group.</span>
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2 years ago
CO2+2H2O=H3O^++HCO3^-
bekas [8.4K]

<u>Answer:</u>

<em>Bronsted Lowry Theory</em>

<em>CO_2 is the acid </em>

<em>H_2 O is the base </em>

<em>H_3 O^+ is the conjugate acid and </em>

<em>HCO_3^- is the conjugate base</em>

<u>Explanation:</u>

Bronsted Lowry Theory:

An acid is a substance that can donate one or more protons

A base is a substance which can accept one or more protons

Hydrogen atom which is neutral (No Charge) contains 1 positive proton, 1 negative electron and 0 neutral neutron.  

Thus Hydrogen atom has no Charge and it is neutral.

When an hydrogen atom loses an electron, Hydrogen ion is formed, which will contain 1 positive proton and 0 negative electron and 0 neutral neutron.

Thus Hydrogen ion has a positive charge.  

Hydrogen ion is also called as a proton since it has only 1 proton in it.

Hydrogen ion in water that is,  

H^++H_2O\Rightarrow H_3O^+

H_3O^+ is called as Hydronium ion.

Acid loses H+ (proton) to form conjugate Base

Base gains H+ (proton) to form conjugate Acid

For example  

Let us consider the example given in the question

CO_2+2H_2 O>H_3 O^+   +HCO_3^- can be written as (removed 1 H_2 O from both the sides )

CO_2+H_2 O>H^++HCO_3^- or  

CO_2+H_2 O  > H_2 CO_3 reversing the equation  

H_2 CO_3+H_2 O>H_3 O^+  +HCO_3^-

H_2 CO_3 is the acid which donates H^+ to form HCO_3^-

H_2 O is the base which gains H^+ to form H_3 O^+

HCO_3^- is the conjugate base and H_3 O^+ is the conjugate acid

So

CO_2 is the acid

H_2 O is the base

H_3 O^+ is the conjugate acid and

HCO_3^- is the conjugate base

(Answer)  

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