CHEMISTRY HIGH SCHOOL

Compounds are formed when the atoms of two or more elements are chemically combined.What type of bond is formed if atoms donate electrons to other atoms when the elements are combined?

A. ionic bond
B. hydrogen bond
C. covalent bond

Answers

Answer 1
Answer: Fully donating an electron results in an ionic bond, so A is the correct answer.

In comparison, B, a hydrogen bond, is a bond that forms between an H in one compound and an O, N, or F in another.  It is among the strongest of intermolecular forces, while ionic/covalent bonds are intramolecular.

C, a covalent bond, is a bond that forms when atoms share electrons instead of donating them.

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Among the factors that affect the solubility of a substance are type of solvent and temperature.

How would you prepare 250 mL of a 6.0M NaNO3 solution from a 15M NaNO3 solution?

Answers

You would need to mix 0.100 liters (or 100 mL) of the 15M NaNO3 solution with enough solvent (e.g., water) to bring the total volume to 250 mL in order to obtain a 6.0M NaNO3 solution.

To prepare 250 mL of a 6.0M NaNO3 solution from a 15M NaNO3 solution, you can use the dilution formula:

C1V1 = C2V2

Where:

C1 = concentration of the stock solution

V1 = volume of the stock solution to be used

C2 = desired final concentration

V2 = final volume of the diluted solution

In this case:

C1 (concentration of the 15M NaNO3 solution) = 15M

C2 (desired final concentration) = 6.0M

V2 (final volume of the diluted solution) = 250 mL (0.250 L)

Now, plug in the values and solve for V1 (volume of the stock solution to be used):

15M * V1 = 6.0M * 0.250 L

V1 = (6.0M * 0.250 L) / 15M

V1 = 0.100 L

Thus, you would need to mix 0.100 liters (or 100 mL) of the 15M NaNO3 solution with enough solvent (e.g., water) to bring the total volume to 250 mL in order to obtain a 6.0M NaNO3 solution.

For more such questions on solvent:

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This is pretty simple actually :) You are going to use the equation M1xV1=M2xV2 
M stands for molarity and V is volume. Plug in the information you have, and then solve for the unknown using simple algebra.  You get 6.0M NaNo3 x 250mL= 15M NaNO3 x V2. Now solve for V2. Keep in mind that you will have to use stoichiometry to convert to liters instead of liters if your answer requires it. Hope this helps! :) 

How many electrons are there in the 2nd principal energy level (n?

Answers

Each principal energy level above the first contains one s orbital and three p orbitals. A set of three p orbitals, called the p sub level, can hold a maximum of six electrons. Therefore, the second level can contain a maximum of eight electrons - that is, two in the s orbital and 6 in the three p orbitals.

Hope this helps!! (If not sorry!)

In which block of the periodic table is chromium (Cr) found?

Answers

The correct answer for above statement:

chromium is in group 6 d-block

Explanation:

The d-block elements are designated transition metals and have valence electrons in d orbital's. The f-block elements, observed in the two rows at the ground of the periodic table, are called inner transition metals and have valence electrons in the f-orbital's.

Chromium is a synthetic element with symbol Cr and atomic number 24. It is the first component in group 6. It is a steely-gray, glistening, dense and brittle metal which takes a high polish, resists smudging, and has a great melting point.
 chromium is in group 6 d-block

How is the periodic table constructed ?

Answers

Before the periodic table, there were a bunch of symbols, number, letters etc (In all kinds of languages) that represented the elements. Scientists around the world saw that a chart of the elements needed to be universally accepted and finalized. A guy named Mendeleev presented this idea to the scientific community. Mendeleev was also the first to order elements according to atomic number rather than atomic weight. The modern day periodic table was not published by him, it was developed with the help of the entire scientific community. Honestly, there isn't a specific way to tell you how the periodic table was constructed, scientists developed thousands of tables that represented the elements. And just to let you know, the modern day periodic table is constantly going through changes as we discover more and more about elements, atoms, molecules etc. so in the near future it wouldn't be surprising if we saw something completely different than what we see today.
The Periodic Table is in order of electrons, and the columns are set up to show the amount of electrons in the outer most orbit.

Based on their locations in the periodic table, which of these elements would you expect to have the greatest atomic radius?A. cesium (Cs)
B. lithium (Li)
C. neon (Ne)
D. radon (Rn)

Answers

Answer: Option (A) is the correct answer.

Explanation:

It is known that atomic size of atoms decreases on moving from left to right in a period of the periodic table. Whereas atomic size increases on moving from top to bottom in a group.

Lithium and cesium are both alkali metals. On the other hand, both neon and radon are noble gases.

Both cesium and radon belongs to sixth period. Cesium being at the extreme left side is larger in size than radon which is at the extreme right side of periodic table. Therefore, atomic radius of cesium will be larger than atomic radius of radon.

Whereas both lithium and neon belongs to second period. Lithium being at the top left side of periodic table has larger atomic radius than neon which is at the top right side.  

Thus, we can conclude that out of the given options cesium has the largest atomic radius.
A because it has the highest energy level and lowest protons

Which of the following can be produced at an ocean continental convergent boundary,_______________ ??????????????????HELP!

Answers

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You didn't give a following list of possible answers. Anyways, volcanic mountains can be produced at an ocean continental convergent boundary. 
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