Chemical Reaction = A solid sodium sulfide reacts with gaseous hydrogen chloride to form sodium chloride and hydrogen gas.

solong [7]

Answer:

<h3>Reactivity is the ability of matter to react chemically with other substances. Flammability is the ability of matter to burn.</h3>

6 0

3 years ago

_S8+ _02 - SO3

Anton [14]

Answer:

a) $S_8+12O_2\rightarrow 8SO_3$

b) Combination or synthesis reaction

c)

$1molS_8:12molO_2;or\\ \\ \\ \dfrac{1molS_8}{12molO_2}$

d) 30 g.

Explanation:

a. Balance the Equation

To balance the equation you must add the coefficients that yield the same number of atoms for the same kind of atoms on each side of the chemical equation.

You cannot modify the superscripts because the they are part of the chemical formula of the compound or molecule, they indicate the number of atoms of each kind inside the compound, i.e. they determine the composition substance.

The coefficients can be adjusted because they just indicate the number of units that react or are produced.

Starting from the skeleton equation:

$S_8+O_2\rightarrow SO_3$

Add an 8 before the SO₃ to balance the S atoms:

$S_8+O_2\rightarrow 8SO_3$

Now add a coefficient of 12 for the O₂ molecule on the left side:

$S_8+12O_2\rightarrow 8SO_3$

If you count:

Atom Leff side Right side

S 8 8

O 24 24

Thus, the equation is balanced.

b. What type of chemical reaction is this?

When two elements or compounds combine to form one single compound that is a combination reaction.

The general form of a combination reaction is:

A + B → AB

This is called comibnation to distinguish from single replacement, double replacement, decompositon, and combustion reaction.

It is also named synthesis reaction because a new compound is being synthetized ("created") from simpler substances.

The combination of a non-metal and oxygen is a typical reaction of synthesis in which a basic oxide is produced. They are named basic oxides because they react with water to form a base: hydroxide.

c. What is the molar ratio of S₈, to O₂?

The mole ratio also called theoretical or stoichiometric mole ratio is the ratio of coefficients of the substances. The mole ratio of the reactants indicate the proportion in which the reactants combine to each other to form the product or products.

Then, take the coefficients of S₈ and O₂ from the balanced molecular chemical equation and form the ratio:

$1molS_8:12molO_2;or\\ \\ \\ \dfrac{1molS_8}{12molO_2}$

That means that every molecule (or mole of molecules) of S₈ reacts with 12 molecules (or mole of molecules) of O₂ to form the products: in this case 8 molecules (or mole of molecules of SO₃).

You use this ratio to determine the yield of the reactions in a procedure called stoichiometric calculations.

d. How many grams of O₂ should be used if 100 grams of SO₃, is the desired end product?

You will need the mole ratio of O₂ to SO₃ and the molar masses of both substanes.

Mole ratio:

$\dfrac{8molSO_3}{12molO_2}$

Moles of SO₃

moles = mass in grams/molar mass

molar mass of SO₃ = 80.066g/mol

moles of SO₃ = 100g / 80.066g/mol = 1.25 mol SO₃

Moles of O₂

$1.25molSO_3\times 12molO_2/8molSO_3=1.875molO_2$

Conver to mass of O₂

molar mass of O₂ = 15.999 g/mol

mass of O₂ = 1.875mol × 15.999g/mol = 29.998 g

Round to 1 significant figures: 30 g.

6 0

3 years ago

Which describes a precipitate in a chemical reaction?

nekit [7.7K]

Answer:

D

Explanation: A precipitation reaction is a type of chemical reaction in which two soluble salts in aqueous solution combine and one of the products is an insoluble salt called a precipitate.

5 0

3 years ago

Read 2 more answers

What are its electron-pair and molecular geometries? What is the hybridization of the nitrogen atom? What orbitals on and overla

jok3333 [9.3K]

Answer:

Electron-pair geometry: tetrahedral

Molecular geometry: trigonal pyramidal

Hybridization: sp³

sp³ - 4 p

Explanation:

There is some info missing. I think this is the original question.

For NBr₃, What are its electron-pair and molecular geometries? What is the hybridization of the nitrogen atom? What orbitals on N and Br overlap to form bonds between these elements?

The N-Br bonds are formed by the overlap of the ___ hybrid orbitals on nitrogen with ___ orbitals on Br.

Nitrogen is a central atom surrounded by 4 electron domains. According to VESPR, the corresponding electron-pair geometry is tetrahedral.

Of these 4 electron domains, 3 represent covalent bonds with Br and 1 lone pair. According to VESPR, the corresponding molecular geometry is trigonal pyramidal.

In the nitrogen atom, 1 s orbital and 3 p orbitals hybridize to form 4 sp³ orbitals for each of the electron domains.

The N-Br bonds are formed by the overlap of the sp³ hybrid orbitals on nitrogen with 4p orbitals on Br.

7 0

3 years ago

Calcium ions that act as second messengers are stored in _____.

bagirrra123 [75]

Answer:

Endoplasmic reticulum.

Explanation:

Second messengers are known as intracellular signaling molecules released from the cell in response to exposure to extracellular signaling molecules. Second messenger activate physiological changes at a cellular level, for example proliferation, migration, differentiation, survival, and apoptosis.

Calcium ions are hydrophilic, water-soluble molecules. They are present in intracellular component know as endoplasmic reticulum and quickly released when needed. They are necessary for many important functions including fertilization, muscle contractions, and neurotransmitter release.

6 0

3 years ago