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3 years ago

Which of these is a chemical property of a substance?

Chemistry

1 answer:

ivann1987 [24]3 years ago

8 0

Answer:

A chemical property is a characteristic of a substance that may be observed when it participates in a chemical reaction. Examples of chemical properties include flammability, toxicity, chemical stability, and heat of combustion

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PLZ HELP ME ANSWER FIRST GET BRAINLY

pochemuha

Answer:

I am pretty sure it is visible light

3 0

4 years ago

Read 2 more answers

The pH of a 0.78M solution of 4-pyridinecarboxylic acid HC6H4NO2is measured to be 2.53.Calculate the acid dissociation constant

nika2105 [10]

Answer : The value of acid dissociation constant is, $1.1\times 10^{-5}$

Solution : Given,

Concentration pyridinecarboxylic acid = 0.78 M

pH = 2.53

First we have to calculate the hydrogen ion concentration.

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

$2.53=-\log [H^+]$

$[H^+]=2.95\times 106{-3}M$

Now we have to calculate the acid dissociation constant.

The equilibrium reaction for dissociation of (weak acid) is,

$HC_6H_4NO_2\rightleftharpoons C_6H_4NO_2^-+H^+$

initially conc. 0.78 0 0

At eqm. (0.78-x) x x

The expression of acid dissociation constant for acid is:

$k_a=\frac{[C_6H_4NO_2^-][H^+]}{[C_6H_4NO_2]}$

As, $[H^+]=[C_6H_4NO_2^-]=x$

So, $x=2.95\times 106{-3}M$

Now put all the given values in this formula ,we get:

$k_a=\frac{(x)\times (x)}{(0.78-x)}$

$k_a=\frac{(2.95\times 106{-3})\times (2.95\times 106{-3})}{(0.78-2.95\times 106{-3})}$

$K_a=1.1\times 10^{-5}$

Therefore, the value of acid dissociation constant is, $1.1\times 10^{-5}$

7 0

4 years ago

Which action changes the identity of substance referenced

Scilla [17]

Answer:

When iron turns to rust, the chemical identity of the iron changes. When you break ice, the ice is still ice

5 0

3 years ago

Which factor is difficult to assess in a cost–benefit analysis?

rosijanka [135]

Answer:

it's A

Explanation:

product being used by everyone

hope it helps!

7 0

3 years ago

Read 2 more answers

How many unpaired electrons are present in the ground state of the atoms in group 6a(16)?

____ [38]

Lets take one element from Group 6A, Let it be oxygen, The electronic configuration of Oxygen is as follow,

O = 8 = 1s², 2s², 2px², 2py¹, 2px¹

There are 6 electrons in the valence shell of elements present in Group 6A. The unpaired electrons in 2px and 2py are involved in forming covalent bond, while the pair of electrons in 2s and 2px are unshared and act as lone pair of electrons.

Result:
There are TWO unpaired electrons present in the ground state of Group 6A elements.

5 0

3 years ago