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Minchanka [31]
3 years ago
15

How have methods for transporting goods changed over time?

Chemistry
2 answers:
dimulka [17.4K]3 years ago
8 0

Answer:

Let's use the example of mail, back in the older days they were most likely transported by people. Until people domesticated the horse, messengers or messenger animals, such as birds, could have been used to transport them. Domesticated animals changed the work force for the better, mail was more efficient but it could still take weeks to get certain letters to far away people. As technology advanced, so did transportation, as of today, tradition mail is brought by mail carriers and is still used. The greatest technological success is the email, and can get mail to another country in a matter of seconds. From mail carriers taking months to deliver letters, to a matter of seconds, technology has paved the way for better communication between people in general.

Hope this helps!

Have a great day and stay safe! :))))))

SVEN [57.7K]3 years ago
7 0

Industrialization has historically led to urbanization by creating economic growth and job opportunities that draw people to cities. Urbanization typically begins when a factory or multiple factories are established within a region, thus creating a high demand for factory labor.

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When we react a weak acid with a strong base of equal amounts and concentration, the component of the reaction that will have th
vagabundo [1.1K]

Answer:

d. the conjugate base.

Explanation:

The general reaction of a weak acid, HA, with a strong base YOH, is:

HA + YOH → A⁻ + H₂O + Y⁻

<em>Where A⁻ is the conjugate base of the weak acid and Y⁻ usually is a strong electrolyte.</em>

<em />

That means after he complete reaction you don't have weak acid nor strong base, just conjugate base that will be in equilibrium with water, thus (Strong electrolyte doesn't change pH:

A⁻ + H₂O ⇄ HA + OH⁻

As the equilibrium is producing OH⁻, the pH of the solution is being affected for the conjugate base

Right option:

<h3>d. the conjugate base. </h3>

6 0
3 years ago
A certain first-order reaction has a rate constant of 2.75 10-2 s−1 at 20.°c. what is the value of k at 45°c if ea = 75.5 kj/mol
Gekata [30.6K]

Answer:

0.314 s⁻¹  

Step-by-step explanation:

Use the <em>Arrhenius equation.</em>

\ln( \frac{k_2 }{k_1 }) = (\frac{E_{a} }{R })(\frac{ 1}{T_1} - \frac{1 }{T_2 })\\

Data:

k₁ = 0.0275 s⁻¹;            k₂ = ?

Eₐ = 75.5 kJ·mol⁻¹

T₁ = 20 °C = 293.15 K; T₂ = 45°C = 318.15 K

<em>Calculation: </em>

\ln(\frac{k_{2} }{0.0275}) = (\frac{75 500 }{8.314})(\frac{ 1}{293.15} - \frac{1 }{318.15 })

\ln(\frac{k_{2} }{0.0275}) = 9081\times 2.681 \times10^{-4}

\ln(\frac{k_{2} }{0.0275}) = 2.434

\frac{k_{2} }{0.0275} = \text{e}^{2.434}

\frac{k_{2} }{0.0275} = 11.41

k₂ = 0.0275 × 11.41

k₂ = 0.314 s⁻¹

3 0
3 years ago
Calcium drawing look like
leva [86]
Not the best drawing but hope thats correct

7 0
2 years ago
Lithium hydroxide reacts with hydrobromic acid(HBr) to produce lithium bromide and water. If you
sweet-ann [11.9K]

Answer:

3.00 moles of Lithium bromide will be produced

Explanation:

The reaction that takes place is:

  • LiOH + HBr → LiBr + H₂O

By looking at the reaction equation, we can see that<em> the reaction of 1 mol of lithium hydroxide (LiOH) produces 1 mol of lithium bromide (LiBr).</em> Thus, 3.00 moles of LiOH would conversely produce 3.00 moles of LiBr.

4 0
3 years ago
Tracy observes an organism that lives in a lake by her house. The organism has an internal skeleton, scales, fins, and gills. Th
andrey2020 [161]
I'd say B. Its most likely a fish.
8 0
3 years ago
Read 2 more answers
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