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Nadya [2.5K]
3 years ago
6

All atoms in the main group want _____ electrons in their outset shell

Chemistry
1 answer:
hammer [34]3 years ago
3 0
Most of the elements important in biology need 8 electrons in their outermost shell
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Use the big bang theory to explain why scientists do not expect to find galaxies that have large blue shifts.
STALIN [3.7K]

Answer:

becoz they want so

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5 0
2 years ago
The relationship between an object's mass (m), its acceleration (a), and the applied force (F) is described in which of Newton's
Kay [80]

Answer: so the answer is A

Explanation: The relationship between an object's mass (m), its acceleration (a), and the applied force (f) is F=ma. ... This law requires that the direction of the acceleration vector is in the same direction as the force vectors.

5 0
3 years ago
What do all the elements in one row of the periodio fable have in common?
Mamont248 [21]

Answer:

Energy levels

Explanation:

Elements in one row of the periodic table have the same energy levels. A row on the periodic table is the horizontal arrangement of elements. These rows are called periods.

There are 7 periods on the periodic table.

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4 0
3 years ago
A compound has a pka of 7.4. to 100 ml of a 1.0 m solution of this compound at ph 8.0 is added 30 ml of 1.0 m hydrochloric acid.
Monica [59]
 Using the Henderson-Hasselbalch equation on the solution before HCl addition: pH = pKa + log([A-]/[HA]) 8.0 = 7.4 + log([A-]/[HA]); [A-]/[HA] = 4.0. (equation 1) Also, 0.1 L * 1.0 mol/L = 0.1 moles total of the compound. Therefore, [A-] + [HA] = 0.1 (equation 2) Solving the simultaneous equations 1 and 2 gives: A- = 0.08 moles AH = 0.02 moles Adding strong acid reduces A- and increases AH by the same amount. 0.03 L * 1 mol/L = 0.03 moles HCl will be added, soA- = 0.08 - 0.03 = 0.05 moles AH = 0.02 + 0.03 = 0.05 moles Therefore, after HCl addition, [A-]/[HA] = 0.05 / 0.05 = 1.0 Resubstituting into the Henderson-Hasselbalch equation: pH = 7.4 + log(1.0) = 7.4, the final pH.
6 0
3 years ago
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What is the main purpose of the second paragraph?
Svetlanka [38]
To explain your first paragraph which includes your thesis. The second paragrph supports your first pragraph
5 0
3 years ago
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