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4 years ago

Who uses the periodic table?

Chemistry

2 answers:

Alborosie4 years ago

6 0

Every single person in any scientific field that uses chemistry

jeka944 years ago

4 0

People who learn and study chemistry use the periodic table.

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¿Las cargas eléctricas forman parte de los átomos?

shusha [124]

Answer:

si. en los atomos los protones y los electrones llevan cargas electricas

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3 years ago

The invention of the ____ allows scientists to learn about cells.

zavuch27 [327]

The Microscope allowed scientists to learn about cells.

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3 years ago

Rust is formed by the interaction of iron and oxygen. When rust formed on an iron nail with a mass of 100g,the mass of the ruste

babymother [125]

43g id say. Due to conservation of mass that is the only one that makes even slight sense. If you had more air react then the nail would heavier

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3 years ago

What happens if you add a neutron to an atom?

Paladinen [302]

Answer:

if you add or subtract a neutron from an atom it will become a new isotopes of the same element

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3 years ago

Read 2 more answers

Water ionizes by the equationH2O(l)⇌H+(aq)+OH−(aq)The extent of the reaction is small in pure water and dilute aqueous solutions

tia_tia [17]

Explanation:

$H_2O(l)\rightleftharpoons H^+(aq)+OH^-(aq)$

The value of $K_w$ :

$K_w=[H^+][OH^-]$

a. pOH = 3.51

The sum of pH and pOH is equal to 14.

pH + pOH = 14 (at 25°C)

pH = 14 - 3.51 = 10.49

The pH of the solution is defined as negative logarithm of hydrogen ion concentration in solution.

$pH=-\log[H^+]$

$10.49=-\log[H^+]$

$[H^+]=3.2\times 10^{-11}$

$3.2\times 10^{-11} M$ is the $H^+$ concentration for an aqueous solution with pOH = 3.51 at 25°C.

At a certain temperature, the pH of a neutral solution is 7.56.

Neutral solution means that concentration of hydrogen ion and hydroxide ions are equal.

$[H^+]=[OH^-]$

$7.56=-\log[H^+]$

$[H^+]=2.754\times 10^{-8} M$

The value of $K_w$ at at this temperature:

$K_w=[H^+][OH^-]$

$K_w=[H^+][H^+]$

$K_w=(2.754\times 10^{-8})^2=7.6\times 10^{-16}$

The value of $K_w$ at at this temperature is $7.6\times 10^{-16}$ .

5 0

4 years ago