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3 years ago

Explain how using dimensional analysis could have prevented this crash

Chemistry

1 answer:

irakobra [83]3 years ago

3 0

Answer:you keep it safe

Explanation:

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When the concentration of A in the reaction A ..... B was changed from 1.20 M to 0.60 M, the half-life increased from 2.0 min to

Reika [66]

Answer:

$0.4167\ \text{M}^{-1}\text{min}^{-1}$

Explanation:

Half-life

${t_{1/2}}A=2\ \text{min}$

${t_{1/2}}B=4\ \text{min}$

Concentration

${[A]_0}_A=1.2\ \text{M}$

${[A]_0}_B=0.6\ \text{M}$

We have the relation

$t_{1/2}\propto \dfrac{1}{[A]_0^{n-1}}$

$\dfrac{{t_{1/2}}_A}{{t_{1/2}}_B}=\left(\dfrac{{[A]_0}_B}{{[A]_0}_A}\right)^{n-1}\\\Rightarrow \dfrac{2}{4}=\left(\dfrac{0.6}{1.2}\right)^{n-1}\\\Rightarrow \dfrac{1}{2}=\left(\dfrac{1}{2}\right)^{n-1}$

Comparing the exponents we get

$1=n-1\\\Rightarrow n=2$

The order of the reaction is 2.

$t_{1/2}=\dfrac{1}{k[A]_0^{n-1}}\\\Rightarrow k=\dfrac{1}{t_{1/2}[A]_0^{n-1}}\\\Rightarrow k=\dfrac{1}{2\times 1.2^{2-1}}\\\Rightarrow k=0.4167\ \text{M}^{-1}\text{min}^{-1}$

The rate constant is $0.4167\ \text{M}^{-1}\text{min}^{-1}$

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2 years ago

Which of the following are examples of elements? a. CO b. Li c. KBr d. Ca

bogdanovich [222]

$\huge\boxed{\textsf{Li and Ca}}$

An element is a substance that can't be broken down further. Lithium (Li) and calcium (Ca) are examples of elements.

Carbon monoxide (CO) and potassium bromide (KBr) are examples of compounds, which are made up of more than one element put together.

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1 year ago

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How does hydrogen bonding affect the physical properties of substances?

alekssr [168]

The melting and boiling point depend on the strength of the ihydrogen bonds. Hydrogen bonding will cause the higher the melting and boiling points because more energy is needed to break bonds between molecules.
Hydrogen bonds affect solubility in water, molecules with hydrogen bonds dissolve better in water.

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3 years ago

Fabric is made of ___

GuDViN [60]

Answer:

Fabric is made of cotton.

Explanation:

Hope that helps :)

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3 years ago

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__Ca(OH)2 + __ (NH4)2SO4 ----- > ___CaSO4 + ___NH3 + __H2O A)11 B)5 C)7 D)9

katovenus [111]

There would be a 2 infront of the NH3 and and 2 Infront of the H2O

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3 years ago