1. (4 points) You are a hydrologist (scientist who studies water systems), trying to figure

A student performed the same experiment but used radish sprouts. their data showed three peaks for the optimal ph at 2.4, 8.5, a

prisoha [69]

The logical hypothesis for the observed data could be something like :
The reason of the difference in optimal Ph between the experiments could be caused by the Enzyme extract of the different enzymatic forms of the Radish Sprouts , causing different level of Ph

4 0

3 years ago

Which of these best explains why a paper clip can float on water ? A.Water has a very high specific heat. B.water molecules at t

Virty [35]

d) water molecules near the surface produce more buoyant force than water molecules within liquid.

hope this helps!

3 0

3 years ago

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When a chemical reaction takes place, the total mass of the reactants equals the total mass of the products. The total number of

kari74 [83]

There is 18 + 633= 651 grams of HCl in aqueous form depending how the reaction is done

5 0

4 years ago

What is the percent yield of lithium chloride if a reaction starts with 20.0 g lithium hydroxide and yields 6.00 g lithium chlor

Colt1911 [192]

Answer: The percent yield of lithium chloride if a reaction starts with 20.0 g lithium hydroxide and yields 6.00 g lithium chloride is 17.2 %

Explanation:

The balanced chemical reaction is

$LiOH+KCl\rightarrow LiCl+KOH$

To calculate the moles, we use the equation:

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

a) moles of $LiOH$

$\text{Number of moles}=\frac{20.0g}{24g/mol}=0.83moles$

b) moles of $LiCl$

$\text{Number of moles}=\frac{6.00g}{42g/mol}=0.14moles$

According to stoichiometry :

1 mole of $LiOH$ produces = 1 mole of $LiCl$

Thus 0.83 moles of $LiOH$ produce= $\frac{1}{1}\times 0.83=0.83moles$ of $LiCl$

Mass of $LiCl=moles\times {\text {Molar mass}}=0.83moles\times 42g/mol=34.9g$

The theoretical yield of $LiCl$ = 34.9 g

The experimental yield of ethanol = 6.00 g

Now we have to calculate the percent yield of ethanol.

$\%\text{ yield}=\frac{\text{Actual yield}}{\text{Theoretical yield}}\times 100=\frac{6.00g}{34.9g}\times 100=17.2\%$

Therefore, the percent yield is, 17.2 %

6 0

3 years ago

A compound is composed of 22.5% phosphorus and 77.5% chlorine. the molecular mass of the compound is 137.32 g/mol. what is the m

asambeis [7]

The molecular formula of the compound is PCl₃ if the molecular mass of the compound is 137.32 g/mol.

An empirical formula can be described as a formula that tells about the relative ratios of different atoms in a compound.

The empirical formula for this compound containing phosphorus and chlorine can be calculated as follows;

As the compound is composed of 22.5% phosphorous and 77.5% chlorine, therefore;

Phosphorus = (22.5/100) × 137.32 = 0.225 × 137.32 = 30.897

Chlorine = (77.5/100) × 137.32 = 0.775 × 137.32 = 106.423

Now we can find the moles of each atom by using their molar mass as follows;

Phosphorus = 30.897 ÷ 30.97 = 0.998 moles

Chlorine = 106.423 ÷ 35.453 = 3.002 moles

Now dividing each mole value by the smallest determined number of moles (0.998) as follows;

Phosphorus = 0.998 / 0.998 = 1 mole

Chlorine = 3.002 / 0.998 = 3.008 ≈ 3 moles

Therefore the molecular formula of the compound will be PCl₃.

To learn more about the empirical formula; click here:

brainly.com/question/28080770

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7 0

1 year ago

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