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Nataly_w
6 days ago
6

Which correctly summarizes the trend in electron affinity?it tends to be very high for group 2.it tends to be more negative acro

ss a period.it tends to remain the same across periods.it tends to be more negative down a group?
Chemistry
2 answers:
lorasvet [2.5K]6 days ago
7 0

It's B. Or 2. It tends to become more negative as you proceed across a period.

For those wanting to get straight to the point

lions [2.6K]6 days ago
4 0
The option that accurately reflects the trend regarding electron affinity is the second choice: it typically becomes more negative as you move across a period."<span> Electron affinity represents the energy that a neutral atom either absorbs or releases upon gaining an electron. A more negative value indicates a stronger attraction of the atom for an extra electron. Thus, as electronegativity increases across a period, which shows how much more strongly atoms on the left side draw electrons, the observation that electron affinity becomes more negative across a period suggests that atoms on the left have a greater tendency to accept an additional electron.</span>
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A) How many moles of CO2 and H2O are formed from 3.85 mole of propane C3H8 (This calculation needs to be done twice-once fro CO2
castortr0y [2743]

Answer:

11.55 moles of CO2 gas result from 3.85 moles of propane.

15.4 moles of H2O result from 3.85 moles of propane.

b) 0.5176 moles of water result from 0.647 moles of oxygen gas.

0.1294 moles of propane are reacted.

Explanation:

C_3H_7+5O_2\rightarrow 3CO_2+4H_2O

a) Amount of propane = 3.85 moles

The reaction indicates that for every mole of propane, 3 moles of carbon dioxide are produced.

Thus, 3.85 moles of propane yield:

\frac{3}{1}\times 3.85 mol=11.55 mol of carbon dioxide.

11.55 moles of CO2 gas result from 3.85 moles of propane.

The reaction also specifies that 1 mole of propane produces 4 moles of water.

Therefore, 3.85 moles of propane will generate:

\frac{4}{1}\times 3.85 mol=15.4 mol of water.

15.4 moles of H2O result from 3.85 moles of propane.

b) Amount of oxygen gas = 0.647 moles

The reaction states that 5 moles of oxygen yield 4 moles of water.

As a result, 0.647 moles of oxygen will produce:

\frac{4}{5}\times 0.647 mol=0.5176 mol of water.

0.5176 moles of water result from 0.647 moles of oxygen gas.

The reaction indicates that 5 moles of oxygen gas interact with 1 mole of propane.

Then, 0.647 moles of oxygen will cause:

\frac{1}{5}\times 0.647 mol=0.1294 mol of propane to react.

0.1294 moles of propane are reacted.

5 0
27 days ago
a chemist uses hot hydrogen gas to convert chromium (iii) oxide to pure chromium. how many grams of hydrogen are needed to produ
lorasvet [2515]
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6 0
6 days ago
Three substances are poured in a cylinder with different densities. Draw the cylinder with the three layers and identify the sub
lorasvet [2515]

Clarification:

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3 0
24 days ago
Which procedure cannot be performed on a hot plate, requiring a Bunsen burner instead
Tems11 [2400]

Answer: The process of heating a crucible to eliminate moisture from a hydrate.

Explanation:

The available choices are:

a. Heating a solvent to aid in the dissolution of a solute.

b. Heating a solid in isolation to remove moisture.

c. Bringing water to a boil for use in a water bath.

d. Heating a crucible to eliminate moisture from a hydrate.

Possible actions that can be done on a hot plate include:

a. Heating a solvent to assist a solute in dissolving.

b. Heating a solid in isolation to dry it.

c. Heating water to boiling for a water bath.

However, it's important to note that using a hot plate for heating a crucible to remove water from a hydrate is not advisable. Silica or ceramic materials are not meant to be heated on a hot plate.

Consequently, the correct procedure is heating a crucible to remove water from a hydrate.

4 0
1 month ago
A 0.89% (w/v) sodium chloride solution is referred to as physiological saline solution because it has the same concentration of
Tems11 [2400]
1) To express 0.89% m/v, it equals 0.89 grams of NaCl per 100 ml of solution.

This corresponds to 8.9 grams of NaCl in 1000 ml of solution, or 8.9 grams in 1 liter.

2) Molarity is represented as M = moles of solute / liters of solution.

Thus, we need to determine the moles in 8.9 grams of NaCl.

3) The molar mass of NaCl is calculated as 23.0 g/mol + 35.5 g/mol = 58.5 g/mol.

4) Therefore, the number of moles of NaCl calculates as mass / molar mass = 8.9 g / 58.5 g/mol = 0.152 moles.

5) Consequently, M = 0.152 moles of NaCl / 1 liter of solution = 0.152 M.

Answer: 0.152 M
4 0
25 days ago
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