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miss Akunina [59]
2 years ago
5

Why is it important in an ideal simple experiment to change only one variable from trial to trial?

Chemistry
1 answer:
artcher [175]2 years ago
6 0
By changing only one variable in an experiment, and holding all other factors exactly the same, any change in the result of the experiment can be more likely attributed to the changed variable. This increases the validity of the experiment.

If you like my answer, please vote me a 'brainliest'; I'm trying to improve my site stats :-)
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When 2.00 g of methane are burned in a bomb calorimeter, the change in temperature is 3.08°C. The heat capacity of the calorimet
melisa1 [442]

Answer:

The approximate molar enthalpy of combustion of this substance is -66 kJ/mole.

Explanation:

First we have to calculate the heat gained by the calorimeter.

q=c\times \Delta T

where,

q = Heat gained = ?

c = Specific heat = 2.68 kJ/^oC

ΔT =  The change in temperature = 3.08°C

Now put all the given values in the above formula, we get:

q=2.68 kJ/^oC\times 3.08^oC

q=8.2544 kJ

Now we have to calculate molar enthalpy of combustion of this substance :

\Delta H_{comb}=-\frac{q}{n}

where,

\Delta H_{comb} = enthalpy change = ?

q = heat gained = 8.2544kJ

n = number of moles methane = \frac{\text{Mass of methane}}{\text{Molar mass of methane }}=\frac{2.00 g}{16.042 g/mol}=0.1247 mole

\Delta H_{comb}=-\frac{8.2544 kJ}{0.1247 mole}=-66.21 kJ/mole\approx -66 kJ/mole

Therefore,  the approximate molar enthalpy of combustion of this substance is -66 kJ/mole.

6 0
3 years ago
Read the excerpt from "The Speech."
Y_Kistochka [10]

Answer:

<em>it's</em> <em>quickly moved</em>

Explanation:

<em>whisk </em>

<em>/(h)wisk/ </em>

<em>Learn to pronounce </em>

<em>verb </em>

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<em />

<em>take or move (someone or something) in a particular direction suddenly and quickly.</em>

<em />

<em>Hope this helps ^^</em>

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They show equal response to every kind of taste , doesn't matter if sour , salty , sweet , pungent etc . that depends on what the person likes the most , if you like sugary edibles , then the brain would sense it and be happy about it , and show a greater tendency towards it. 
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What is the term for a ratio of equivalent measurements that can be used to change a value from one until into another
Olegator [25]

Answer:conversion factor

Explanation:

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3 years ago
6. Three ice cubes are placed inside a glass of hot chocolate. Which of the following best
ycow [4]
It’s the first 1 M yea it’s the first one
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