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3 years ago

8

Explain what a scientist is

2 answers:

Zepler [3.9K]3 years ago

3 0

What qualifies someone to be one is someone who systematically gathers and uses research and evidence making a hypothesis and testing it to gain and share understanding and knowledge.

but the role of a scientist is..: scientists use their resources to bring out change, wether it is change in medicine, improvements in the environment, or creating efficient fuels

I rlly hope this helps tysm

Nonamiya [84]3 years ago

3 0

Someone who conducts scientific research to advance knowledge in an area of interest.

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3 years ago

1. How do metals and non-metals react with acids? Write and explain the chemical equation for the reaction of magnesium with sul

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Answer:

1. How do metals and non-metals react with acids?

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Magnesium + sulphuric acid = Hydrogen + salt

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Aluminium + Hydrochloric acid = Hydrogen + Aluminium chloride

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3 years ago

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Consider the solubilities of a particular solute at two different temperatures.

GenaCL600 [577]

Explanation:

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3 years ago

The heat of fusion AH, of ethyl acetate (C4H802) is 10.5 kinol. Calculate the change in entropy as when 398. g of ethy, acetate

Hitman42 [59]

<u>Answer:</u> The entropy change of the ethyl acetate is 133. J/K

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass of ethyl acetate = 398 g

Molar mass of ethyl acetate = 88.11 g/mol

Putting values in above equation, we get:

$\text{Moles of ethyl acetate}=\frac{398g}{88.11g/mol}=4.52mol$

To calculate the entropy change for different phase at same temperature, we use the equation:

$\Delta S=n\times \frac{\Delta H_{fusion}}{T}$

where,

$\Delta S$ = Entropy change = ?

n = moles of ethyl acetate = 4.52 moles

$\Delta H_{fusion}$ = enthalpy of fusion = 10.5 kJ/mol = 10500 J/mol (Conversion factor: 1 kJ = 1000 J)

T = temperature of the system = $84.0^oC=[84+273]K=357K$

Putting values in above equation, we get:

$\Delta S=\frac{4.52mol\times 10500J/mol}{357K}\\\\\Delta S=132.9J/K$

Hence, the entropy change of the ethyl acetate is 133. J/K

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3 years ago

A chemical equation is balanced when the

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