Can helium pair up to become a compound?(ex: sodium and chlorine=sodium chloride)

QUESTION POSTED AT 15/02/2020 - 11:52 AM

Answered by admin AT 15/02/2020 - 11:52 AM

Helium is a noble gas, and noble gases do not react with other elements. Therefore, helium will not form compounds
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The following two experiments are carried out with anhydrous potassium chloride and observations X and Y are made at the end of each experiment. Concentrated sulfuric acid is added to the potassium chloride and the fumes produced are bubbled into aqueous potassium iodide solution - observation X. The potassium chloride is dissolved in aqueous ammonia and this is then added to aqueous silver nitrate - observation Y. What are the observations X and Y?

Answer:

Observation X: The aqueous potassium iodide solution becomes yellow in color

Observation Y: A clear, colorless solution is observed.

Explanation:

Experiment 1

When Concentrated sulfuric acid is added to potassium chloride, hydrogen chloride gas is produced:

H₂SO₄ + 2KCl ⇒ 2HCl (g) + K₂SO₄

When the HCl gas is bubbled into aqueous potassium iodide, a redox reaction takes place at room temperature when energy is provided in the form of light:

4H⁺ + 4I⁻ + O₂ ⇒ 2I₂ + 2H₂O

The iodine causes the solution to become yellow in color (or darker yellow/brown at high concentrations of iodine).

Experiment 2:

When potassium chloride in aqueous ammonia is added to aqueous silver nitrate, the following net reaction occurs:

Ag⁺ + 2NH₃ ⇒ [Ag(NH₃)₂]⁺

The silver reacts with ammonia rather than chloride as ammonia is a better ligand in this case. The ammonia complex is soluble in water.

Thus, a clear, colorless solution will be observed.

ANSWERED AT 28/02/2020 - 10:48 AM


QUESTION POSTED AT 28/02/2020 - 10:48 AM

How many grams of potassium chlorate decompose to potassium chloride?

You have to find out how many moles of O2 you have at the pressure and temperature. Use PV=nRT then calculate grams from moles of KC103

ANSWERED AT 28/02/2020 - 07:52 AM


QUESTION POSTED AT 28/02/2020 - 07:52 AM

What is the family number for helium?

The charge for heliums family is 1+.

ANSWERED AT 28/02/2020 - 06:44 AM


QUESTION POSTED AT 28/02/2020 - 06:44 AM

When sodium carbonate is dissolved in water, it doesn’t dissociate, or break up, completely. There is always some sodium carbonate in solution. Knowing this, is it a strong or weak base? How do you know?

It's a weak base because weak bases don't dissociate completely. If it did, then it would be a strong base.

ANSWERED AT 27/02/2020 - 11:04 AM


QUESTION POSTED AT 27/02/2020 - 11:04 AM

The molecule mass of sodium oxide na2o is

Molecular mass of Na2O = 46+16= 62 u

ANSWERED AT 27/02/2020 - 10:19 AM


QUESTION POSTED AT 27/02/2020 - 10:19 AM

Which element has the most metallic character, silicon sodium sulfur or thallium?

Sodium has the most metallic character.

ANSWERED AT 27/02/2020 - 09:41 AM


QUESTION POSTED AT 27/02/2020 - 09:41 AM

Which element has the most metallic character, silicon sodium sulfur or thallium?

Sodium correct me if im wrong.

ANSWERED AT 27/02/2020 - 09:41 AM


QUESTION POSTED AT 27/02/2020 - 09:41 AM

Which of these elements exist as a liquid at normal earth temperatures? Bromine Sodium Oxygen mercury

The answer is mercury. hope this helps! :)

ANSWERED AT 27/02/2020 - 09:35 AM


QUESTION POSTED AT 27/02/2020 - 09:35 AM

Net ionic equation of hydrated oxalic acid and sodium hydroxide

H2C2O4(aq) + 2OH- --> C2O4^2- + 2H2O(l)

ANSWERED AT 27/02/2020 - 09:29 AM


QUESTION POSTED AT 27/02/2020 - 09:29 AM

0.80 g of hydrogen chloride (hcl is dissolved in water to make 5.5 l of solution. what is the ph of the resulting hydrochloric acid solution?

HCl is a strong acid and so dissociates fully in water:
HCl(aq) --> H+(aq) + Cl-(aq)
Since there is a 1:1 mole ratio between HCl and H+ in this reaction, the number of moles of H+ = number of moles of HCl. The number of moles of HCl can be calculated as moles = mass/RMM = 0.80g / 36.5g/mol = 0.022mol.
Since 5.5 l  of solution is made, the concentration of H+ is:
[H+] = 0.022mol / 5.5l = 0.004M. This can then be used to calculate pH through the equation pH = -log[H+] = -log(0.004) = 2.40

ANSWERED AT 26/02/2020 - 11:38 PM


QUESTION POSTED AT 26/02/2020 - 11:38 PM

Sodium ion and calcium ions produce nearly the same color in a flame test. Describe a way to differentiate between the two using a solution of Na2CO3 and write a balanced equation

To different sodium from calcium ions, we can add sodium and calcium ions separately to Na2CO3. On the sodium ion side, there will be no reaction while with Ca 2+ ions, the product resulting from the reaction will be CaCO3 via single replacement reaction. CaCO3 is a precipitate which makes the difference between the two ions.

ANSWERED AT 26/02/2020 - 04:16 PM


QUESTION POSTED AT 26/02/2020 - 04:16 PM

What is the molality of 15.4 grams sodium bromide (NaBr) dissolved in 125 grams of water

Http://www.chem.tamu.edu/class/fyp/keeney/ch14     this should help
 you

ANSWERED AT 26/02/2020 - 03:14 PM


QUESTION POSTED AT 26/02/2020 - 03:14 PM

The MSDS for sodium hydroxide gives it a health rating of 3, a flammability rating of 0, and a reactivity rating of 1. According to the MSDS, which best describes sodium hydroxide? highly corrosive but not highly flammable highly reactive and corrosive highly flammable but not highly corrosive not highly reactive or corrosive

I believe the correct answer would be highly corrosive but not highly flammable. It is given a high health rating which would mean that it is very dangerous when in direct contact however it has a zero flammability rating which would mean that it does not burn O2.

ANSWERED AT 26/02/2020 - 02:39 PM


QUESTION POSTED AT 26/02/2020 - 02:39 PM

What is the critical temperature at which hydrogen can begin to fuse into helium in the core?

Negative 0 hope this helps

ANSWERED AT 26/02/2020 - 12:33 PM


QUESTION POSTED AT 26/02/2020 - 12:33 PM

Which pair of atoms will form an ionic compound? A) One atom of oxygen and two atoms of fluorine Eliminate B) One atom of calcium and two atoms of chlorine C) One atom of nitrogen and three atoms of fluorine D) Two atoms of nitrogen and four atoms of oxygen

Answer : The correct option is, (B) One atom of calcium and two atoms of chlorine.

Explanation :

Ionic compound : It is a compound in which the atoms are bonded through the ionic bond.  The ionic bonds are formed between the one metal and one non-metal. It is formed by the complete transfer of electrons.

Covalent compound : It is a compound in which the atoms are covalently bonded. The covalent bonds are formed between two non-metals.  The covalent bonds are formed by the equal sharing of the electrons.

From the given options, only option (B) pair of atoms will form an ionic compound because calcium is a metal and chlorine is a non-metal. While the other options will not form an ionic compound because the two atoms are non-metals.

Hence, the correct option is, (B) One atom of calcium and two atoms of chlorine.

ANSWERED AT 24/02/2020 - 09:31 PM


QUESTION POSTED AT 24/02/2020 - 09:31 PM

Which pair of elements can form an ionic compound? A) Two atoms of hydrogen B) One atom of sodium and one atom of fluorine C) One atom of calcium and one atom of chlorine D) Two atoms of hydrogen and one atom of oxygen

Answer:

The correct option is B) One atom of sodium and one atom of fluorine.

Explanation:

An ionic bond is produced between metallic and non-metallic atoms, where electrons are completely transferred from one atom to another. During this process, one atom loses electrons and another one gains them, forming ions. Usually, the metal gives up its electrons forming a cation to the nonmetal element, which forms an anion. In this way, the octet rule is fulfilled, which establishes that the atoms of the elements bind each other in the attempt to complete their valence layer, leaving the atom stable with 8 electrons in its last layer.

Given this, the correct option is option B). Sodium is a metal forming the cation and fluorine is a nonmetal, then it will form the anion.

ANSWERED AT 24/02/2020 - 09:24 PM


QUESTION POSTED AT 24/02/2020 - 09:24 PM

Determine the molar mass of the ionic compound sodium hydroxide. (1 point)

Sodium - 22.989 - 23
Hydrogen - 1.007 - 1
Oxygen - 15.9994 -16
NaOH - 39.997- 40

It is 39.997 but when rounded it is 40

Hope this helps :)

ANSWERED AT 24/02/2020 - 08:49 PM


QUESTION POSTED AT 24/02/2020 - 08:49 PM

Sodium chloride, table salt, forms ions when dissolved. Sodium loses one electron. Chloride gains one electron. What are the charges on the two ions?

Na is a cation, meaning it needs to lose electrons to gain a full outer shell. Since it is an alkaline metal, it has a charge of +1. (Cations are positive and need to lose electrons.).

Cl is an anion, meaning it needs to gain electrons to gain a full outer shell. Since is is a halogen, it has a charge of -1. (Anions are negative and need to gain electrons).


ANSWERED AT 24/02/2020 - 08:26 PM


QUESTION POSTED AT 24/02/2020 - 08:26 PM

Would beryllium or sodium have properties more similar to magnesium?

Beryllium is the lightest member of the alkaline earth metals family. These metals make up Group 2 (IIA) of the periodic table. They include beryllium, magnesium, calcium, strontium, barium, and radium. Elements in the same column of the periodic table have similar chemical properties.

ANSWERED AT 24/02/2020 - 08:26 PM


QUESTION POSTED AT 24/02/2020 - 08:26 PM

Iron (2) Chloride reacts with sodium oxide to form...?

Hope this is what you're looking for, don't forget to balance the equation too, the answer is balanced.

ANSWERED AT 24/02/2020 - 12:00 PM


QUESTION POSTED AT 24/02/2020 - 12:00 PM

After the transfer of the electron, sodium will form an ion with __________.

It will have a +1 charge.  Sodium likes to give up electrons.

ANSWERED AT 24/02/2020 - 10:41 AM


QUESTION POSTED AT 24/02/2020 - 10:41 AM

Why does an atom of sodium have a larger atomic radius than an atom of chlorine?

Even though sodium and chlorine belong to the same period, Sodium has a larger atomic radius than chlorine.  This is because of the difference in the number of electrons on the valence shell.  Because chlorine has seven valence electrons then these electrons are more tightly held by the nucleus than in the case of Sodium which only has one electron on the  last shell thus the valence shell is loosely held by the nucleus.

ANSWERED AT 23/02/2020 - 02:01 AM


QUESTION POSTED AT 23/02/2020 - 02:01 AM

A chemist reacts 30.0 mL of 5.6 M HCl with an excess of Mg(OH)2. How many grams of magnesium chloride will be produced?

First set-up a balanced chemical equation:

2HCl + Mg(OH)2 ---> MgCl2 + 2H2O

Given: 30mL of 5.6M HCl and excess of Mg(OH)2

To determine the amount of magnesium chloride produced:

MgCl2 (g) = (30mL * (1L/ 1000mL) * 5.6 mol/L ) * (1 mol MgCl2/ 2 mol HCl) * (94.9 g/ mol MgCl2)
              
MgCl2 (g) = 7.97 g 

ANSWERED AT 22/02/2020 - 11:18 PM


QUESTION POSTED AT 22/02/2020 - 11:18 PM

17. Is sodium hydroxide (NaOH) an acid or base?

Sodium is a acid not a base

ANSWERED AT 22/02/2020 - 07:02 PM


QUESTION POSTED AT 22/02/2020 - 07:02 PM