WILL GIVE BRAINIEST ANSWER A chemical equation has different numbers of atoms on the left and right sides.

Chemistry

1 answer:

Alinara [238K]10 months ago

4 0

Answer:

Unbalanced

Explanation:

You need to have the same number of atoms on both sides for it to be balanced

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Sodium atoms differ from sodium ions in that sodium atom contains

Olenka [21]

Explanation:

sodium atom is neutral while sodium ion is a charged specie with a charge of +1

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A 12.2-g sample of x reacts with a sample of y to form 78.9 g of xy. what is the mass of y that reacted?

Sonja [21]

We will assume that the only reactants are x and y and that the only product is xy.

Based on the law of mass conservation, mass is an isolated system that can neither be created nor destroyed.

Applying this concept to the chemical reaction, we will find that the total mass of the reactants must be equal to the total mass of the products,
therefore:
mass of x + mass of y = mass of xy
12.2 + mass of y = 78.9
mass of y = 78.9 - 12.2 = 66.7 grams

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An object has a mass of 18.4g and a volume of 11.2 ml what is the density

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Density=mass/volume

Density=18.4g/11.2ml

Density=1.64

Just make sure you include the unit of measurement with your answer.

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A structure containing at least 2 different types of tissue that work together for a common purpose is

elena-14-01-66 [18.8K]

An organ.....................................................................................................

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Calculate the acid dissociation constant of a weak monoprotic acid if a 0.5M solution of this acid gives a hydrogen-ion concentr

RUDIKE [14]

Let the acid be HA.
The chemical formula for this acid will be the following:

$HA \rightleftharpoons H^{+}+A^{-}$

The formula for the acid dissociation constant will be the following:

 $K_a= \dfrac{[H^+][A^-]}{[HA]}$

We know [H+]=0.0001 (it's given).
However, we must find [A-] and [HA] in order to solve for the constant.

We find that [A-]=[H+] by using a electroneutrality equation.
Also, we can create a concentration equation to find [HA].

 $0.5M=[A^-]+[HA]$
$[HA]=0.5M-[A^-]$

Now, we can find the acid dissociation constant.

 $K_a= \dfrac{[H^+][A^-]}{0.5M-[A^-]}$

$= \dfrac{0.0001*0.0001}{0.5-0.0001} = 2.0*10^{-8}$

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2 years ago