Which element is capable of forming long chains by forming single, double, or triple bonds with itself?

Answers

Answer 1

Answer: the answer is carbon

Answer 2

Answer: Catenation is the property by which it can make bonds with other carbon atoms to form long chains. Hence, carbon, with the least diffuse valence shell p orbital is capable of forming longer p-p sigma bonded chains of atoms than heavier elements which bond via higher valence shell orbitals.

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When hydrogen (H2) and chlorine (Cl2) gases are mixed, hydrogen chloride (HCl) is produced. Hydrogen chloride is classified as what type of matter?

Answers

Answer:

Gaseous matter

Explanation:

Hydrogen chloride gas is formed from the combination of volumes of hydrogen gas and chlorine gas in equal proportion. It is one of the hydrogen halides I.e a compound formed from the combination of hydrogen and halogens.

Hydrogen chloride gas is a colorless gas.

Both hydrogen gas and chlorine gas can be obtained through the electrolysis of brine in the chlor alkali process.

Cl2(g) + H2(g) → 2 HCl(g)

The combination is exothermic and thus heat is released to the surroundings. A construction called HCl burner is used to carry out the reaction because of the heat given off. The produced gas is then absorbed in water

505 grams of KOH are required to completely react with 4.50 mole of sulfuric acid. How many moles of products are produced?

Answers

Answer : The moles of products $K_2SO_4$ and $H_2O$ are, 4.50 and 9 moles.

Explanation : Given,

Mass of water = 5.2 g

Molar mass of water = 18 g/mole

Molar mass of $O_2$ = 32 g/mole

The balanced chemical reaction will be,

$2KOH+H_2SO_4\rightarrow K_2SO_4+2H_2O$

First we have to calculate the moles of KOH.

$\text{Moles of }KOH=\frac{\text{Mass of }KOH}{\text{Molar mass of }KOH}$

$\text{Moles of }KOH=(505g)/(56g/mole)=9.018mole$

Now we have to calculate the limiting and excess reactant.

From the balanced reaction we conclude that

As, 1 mole of $H_2SO_4$ react with 2 mole of $KOH$

So, 4.50 moles of $H_2SO_4$ react with $4.50* 2=9$ moles of $KOH$

From this we conclude that, $KOH$ is an excess reagent because the given moles are greater than the required moles and $H_2SO_4$ is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of products $K_2SO_4$ and $H_2O$ .

From the balanced chemical reaction, we conclude that

As, 1 moles of $H_2SO_4$ react to give 1 moles of $K_2SO_4$

So, 4.50 moles of $H_2SO_4$ react to give 4.50 moles of $K_2SO_4$

and,

As, 1 moles of $H_2SO_4$ react to give 2 moles of $H_2O$

So, 4.50 moles of $H_2SO_4$ react to give $4.50* 2=9$ moles of $H_2O$

Therefore, the moles of products $K_2SO_4$ and $H_2O$ are, 4.50 and 9 moles.

When a substance freezes, what happens to the mass? The mass stays constant as it changes from a liquid to a solid.

The mass increases as it changes from a liquid to a solid.

The mass decreases as it changes from a liquid to a solid.

There is no mass once the substance becomes a solid

Answers

The correct answer is the first statement. The mass stays constant as it changes from a liquid to a solid. According to the Law of Conservation of Mass, mass is conserved. It is not created nor destroyed. Therefore, as the substance turn into solid, all of the substance goes only to the solid phase.

The mass stays constant as it changes from a liquid to a solid

Which barium salts is most insoluble in water?

Answers

Barium salts are mostly insoluble and toxic.

Example : Barium chloride , barium hydroxide, barium carbonate,barium sulfate.

hope this helps!

A reaction starts with 20.0 grams of lithium hydroxide (LiOH) and produces 31.0 grams of lithium chloride (LiCl), what is the percent yield of lithium chloride (LiCl)? *LiOH + KCl - LiCl + KOH

A) 64.5%
B) 88.6%
C) 81.5%
D) 92.8%