CHEMISTRY
HIGH SCHOOL

Answer: A football field which is 120 yard converts into 4320 inches

Answer: 120 feet usually....

HIGH SCHOOL

The boiling points for a set of compounds in a homologous series can be qualitatively predicted using intermolecular force strengths. Using their condensed structural formulas, rank the homologous series for a set of alkanes by their boiling point.

Answer:

The answer to your question is below

Explanation:

Alkane Formula Boiling point (°C)

Methane CH₄ -162

Ethane CH₃CH₃ - 89

Propane CH₃CH₂CH₃ - 42

Butane CH₃(CH₂)₂CH₃ - 0.5

Pentane CH₃(CH₂)₃CH₃ 36

Hexane CH₃(CH₂)₄CH₃ 69

Heptane CH₃(CH₂)₅CH₃ 98

Octane CH₃(CH₂)₆CH₃ 126

Nonane CH₃(CH₂)₇CH₃ 151

Decane CH₃(CH₂)₈CH₃ 174

HIGH SCHOOL

An experiment reacts 20.4 g of zinc metal with a solution containing an excess of iron (III) sulfate. After the reaction, 10.8 grams of iron metal are recovered. What is the percent yield of the experiment?

Answer:

The answer to your question is 92.7%

Explanation:

Balanced Chemical reaction

3 Zn + Fe₂(SO₄)₃ ⇒ 2Fe + 3ZnSO₄

Molecular weight

Zinc = 65.4 x 3 = 196.2g

Iron (III) = 56 x 2 = 112 g

Proportions

196.2 g of Zinc ------------------ 112 g of Iron

20.4 g of Zinc ----------------- x

x = (20.4 x 112) / 196.2

x = 2284.8/196.2

x = 11.65 g of Iron

% yield =

% yield = 0.927 x 100

% yield = 92.7

Answer:

93.1%

Explanation:

As with all stoichometry problems, you must start by writing a balanced equation.

3 Zn (s) + Fe2O3 (s) → 2 Fe (s) + 3 ZnO (s)

Since you are given that there is 20.4g of Zinc metal as a reactant, that is your given. You will use this number to calculate your theoretical yield by using the mole ratio between Zinc and Iron.

20.4 g Zn • 1 mol Zn/65.38 g Zn • 2 mol Fe/3 mol Zn • 55.85g Fe/1 mol Fe = 11.6g Fe

Therefore, your theoretical yield is 11.6g.

Now, you divide your actual yield (10.8g) by your theoretical yield (11.6g) and multiply by 100 to get a percentage.

10.8g/11.6g • 100 = 93.1%

Therefore, your percent yield is 93.1%.

93.1%

Explanation:

As with all stoichometry problems, you must start by writing a balanced equation.

3 Zn (s) + Fe2O3 (s) → 2 Fe (s) + 3 ZnO (s)

Since you are given that there is 20.4g of Zinc metal as a reactant, that is your given. You will use this number to calculate your theoretical yield by using the mole ratio between Zinc and Iron.

20.4 g Zn • 1 mol Zn/65.38 g Zn • 2 mol Fe/3 mol Zn • 55.85g Fe/1 mol Fe = 11.6g Fe

Therefore, your theoretical yield is 11.6g.

Now, you divide your actual yield (10.8g) by your theoretical yield (11.6g) and multiply by 100 to get a percentage.

10.8g/11.6g • 100 = 93.1%

Therefore, your percent yield is 93.1%.

HIGH SCHOOL

1. Suppose you had an unknown solution that contained either dissolved NaCL, or NaNO3. You added AgNO3 to the unknown solution and observed that no solid forms. What can be concluded about the unknown solution? (use the solubility rules)

You can conclude that no chemical reaction occurred and that the elements did not create new substance. Basically, the solution isn't a new substance. The only way you know a new substance has formed is if a solid forms, light is given off, change in temperature, an odor is given off, bubbles form, and if the substance changes color.

MIDDLE SCHOOL

Is cl metal nonmetal or metalloid

or metalloid

Answer:

nonmetal

Explanation:

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