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NikAS [45]
4 years ago
14

What is a dependent variable?

Chemistry
2 answers:
Pachacha [2.7K]4 years ago
7 0
Dependent variable, depending on the argument that we change the variable is changing variable. For Example; Milk degradation, we want to observe the effect of temperature controlled experiment. The same brand, same amount, the same air environment
seraphim [82]4 years ago
4 0
A dependent variable is the variable that changes in an experiment.
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3. If you start with 8x1025 molecules of Cl, and 25 grams of KI, how many grams of KCl would
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Answer:

Percent yield = 89.1%

Explanation:

Based on the equation:

Cl₂ + 2KI → 2KCl + I₂

<em>1 mole of Cl₂ reacts with 2 moles of KI to produce to moles of KCl</em>

<em />

To solve this quesiton we must find the moles of each reactant in order to find the limiting reactant. With the limiting reactant we can find the moles of KCl and the mass:

<em>Moles Cl₂:</em>

8x10²⁵ molecules * (1mol / 6.022x10²³ molecules) = 133 moles

<em>Moles KI -Molar mass: 166.0028g/mol-</em>

25g * (1mol / 166.0028g) = 0.15 moles

Here, clarely, the KI is the limiting reactant

As 2 moles of KI produce 2 moles of KCl, the moles of KCl produced are 0.15 moles. The theoretical mass is:

0.15 moles * (74.5513g / mol) =

11.2g KCl

Percent yield is: Actual yield (10.0g) / Theoretical yield (11.2g) * 100

<h3>Percent yield = 89.1%</h3>
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Change for a liquid state to a solid state is known as what phase change?
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