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3 years ago

When is the restoring force of a spring equal to zero ?

Chemistry

2 answers:

fredd [130]3 years ago

8 0

When is the restoring force of a spring equal to zero ?


C. At the equilibrium position

svet-max [94.6K]3 years ago

4 0

The answer is c. when it is at equilibrium position

hope this helps

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How do cations of the same charge change in radius as you move down a column in the periodic table?

zepelin [54]

Answer:

The cations of the same charge increase in radius as you move down a column in the periodic table.

Explanation:

Moving down a column in the periodic table means to increase the main energy level and keeping the number of electrons in the outermost shell (the number of valence electrons).

The metals (elements in the left side of the periodic table) form positive ions, named cations, when they lose one or more valence electrons.

To depict this more clearly, consider, for example, the column 1 in the periodic table, which is the group of alkal metals: Li, Na, K, Rb, Cs, and Fr.

As you move down that column you ge the following results

Element Period Number of Main cation

(main energy level) valence electrons

Li 2 1 Li⁺

Na 3 1 Na⁺

K 4 1 K⁺

Rb 5 1 Rb⁺

Cs 6 1 Cs⁺

Fr 7 1 Fr⁺

Then, in the last column of the previous table, you see that all the cations have the same charge, because each one is formed after lossing the same number of electrons from the neutral atom (1).

Since, as you move down the column in the periodic table, the valence electrons are in higher main energy levels, which means that the size of both the neutral atom and the and the resultant cation formed after losing the valence electron are bigger than the cation of the previous level. Hence, as a general rule, the radius of the cations of the same charge increase as you move down a colum in the periodic table.

4 0

3 years ago

Which event occurs after erosion of Earth's surface?

masya89 [10]

Answer: Surface materials breaks down into smaller pieces.

Explanation:

Erosion is the geological process in which the topmost layer of the soil is worn away and transported by natural forces such as wind or water. A process which resembles erosion is weathering, which lead to breaking down or dissolution of rocks, but does not involve movement of the rock or soil materials.

After erosion the layers at the top of the soil are also broken down to smaller bits by factors such as water and winds.

4 0

4 years ago

Read 2 more answers

Help will give brainlyness

Morgarella [4.7K]

Answer:

The high melting point is also consistent with its description as an ionic solid. In the crystal, each S2− ion is surrounded by an octahedron of six Ca2+ ions, and complementarity, each Ca2+ ion surrounded by six S2− ions.

Explanation:

You can use the periodic table to predict whether an atom will form an anion or a cation, and you can often predict the charge of the resulting ion. Atoms of many main-group metals lose enough electrons to leave them with the same number of electrons as an atom of the preceding noble gas. To illustrate, an atom of an alkali metal (group 1) loses one electron and forms a cation with a 1+ charge; an alkaline earth metal (group 2) loses two electrons and forms a cation with a 2+ charge, and so on. For example, a neutral calcium atom, with 20 protons and 20 electrons, readily loses two electrons. This results in a cation with 20 protons, 18 electrons, and a 2+ charge. It has the same number of electrons as atoms of the preceding noble gas, argon, and is symbolized Ca2+. The name of a metal ion is the same as the name of the metal atom from which it forms, so Ca2+ is called a calcium ion.

When atoms of nonmetal elements form ions, they generally gain enough electrons to give them the same number of electrons as an atom of the next noble gas in the periodic table. Atoms of group 17 gain one electron and form anions with a 1− charge; atoms of group 16 gain two electrons and form ions with a 2− charge, and so on. For example, the neutral bromine atom, with 35 protons and 35 electrons, can gain one electron to provide it with 36 electrons. This results in an anion with 35 protons, 36 electrons, and a 1− charge. It has the same number of electrons as atoms of the next noble gas, krypton, and is symbolized Br−. (A discussion of the theory supporting the favored status of noble gas electron numbers reflected in these predictive rules for ion formation is provided in a later chapter of this text.)

7 0

3 years ago

What acid has a dissociation constant of 4.57x10^-3

Artyom0805 [142]

The acid Ka (Gallic )

6 0

4 years ago

Name the organic compound of ch3chohch2ch3

tekilochka [14]

Answer:

2-Butanol is the organic compound of ch3chohch2ch3

5 0

3 years ago