An object at rest will stay at rest, and an object in motion will stay in motion becuase of

How does knowing a great deal about the property of certain elements help us as humans?

eimsori [14]

Well because we can use those elements for are own personal use like combining them to make better things like iron is in lots of things. Without knowing alot about the elements we wouldnt know how to use them

7 0

3 years ago

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5,500 cm scientific notation

Alex73 [517]

5,500 written as 5.5 x 103 in scientific notation. hope i helped

7 0

3 years ago

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How can u describes a true solution?

zubka84 [21]

<span>True Solution is a homogeneous mixture of two or more substances in which substance dissolved (solute) in solvent has the particle size of less than 10-9 m or 1 nm. Simple solution of sugar in water is an example of true solution.</span>

5 0

3 years ago

Determine the ph of a 0. 35 m aqueous solution of CH3NH2 (methylamine). The kb of methylamine is?

guajiro [1.7K]

The pH of 0.35 M of CH₃NH₂ is 12.09 and the $k_b$ for methylamine is 4.4 x 10⁻⁴.

pHis the quantitative measure of acidity and basicity of an aqueous or other liquid solution. The scale range goes from 0 to 14. Water has a pH of 7 and is neutral in nature.

<h3>What is dissociation constant?</h3>

The dissociation constant is an equilibrium constant that describes the dissociation or ionization of a base or an acid

$k_a$ describes the dissociation of an acid

$k_b$ describes the dissociation of a base

For methylamine,

$CH_3NH_2 + H_2O\Leftrightarrow CH_3NH_3^+ + OH^-$

Initial concentration of methylamine = 0.35 M

Initial concentration of products = 0

Let, at equilibrium concentration of CH₃NH₂ = 0.35 - x

Then, concentration of CH₃NH₃⁺ and OH⁻ is x and x respectively

$k_b = \frac{[CH_3NH_3^+] [OH^-]}{[CH_3NH_2]}$

The dissociation constant for methylamine, $k_b$ = 4.4 x 10⁻⁴

$4.4 \times 10^-^4 = \frac{x.x}{0.35} \\x^{2} = 4.4 \times 10^-^4 \times 0.35\\x^{2} = 1.54 \times 10^-^4 \\$

$x =0.0124$

pOH = -log[OH] = -log(0.0124) = 1.91

pH + pOH = 14

pH = 14 - 1.91 = 12.09

Thus, the pH of methylamine is 12.09 and $k_b$ is 4.4 x 10⁻⁴

Learn more about pH:

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7 0

2 years ago

In the second footnote it was pointed out that mass and energy are alternate aspects of a single entity called mass-energy. The

Artemon [7]

Answer:

The corresponding mass change in this process is $1.9055\times 10^{-8} g$

Explanation:

$E= mc^2$ ,

where :

E is energy released with respect to mass

m is change mass

c is the speed of light.

2.096 g of hydrogen molecules combined with 96.000 g of oxygen molecules to form water and released energy E.

$E=1.715\times 10^3 kJ=1.715\times 10^6 J$

Mass change in this process = m

$1.715\times 10^6 J=m\times (3\times 10^8 m/s)^2$

$m=1.9055\times 10^{-11} kg=1.9055\times 10^{-8} g$

The change in mass calculated from Einstein equation is small that its effect on formation of product will be negligible.Hence, law of conservation of mass holds correct for chemical reactions.

4 0

3 years ago