CHEMISTRY HIGH SCHOOL

A solution of copper sulfate (CuSO4) produced by bioleaching has a concentration of 0.319 g/dm3 Relative atomic masses (Ar): Cu = 63.5 O = 16 S = 32 Calculate the number of moles of copper that can be produced from 1 dm3 of this solution.

Answers

Answer 1

Answer:

moles Cu produced : 0.002

Further explanation

Concentration of copper sulfate (CuSO₄) : 0.319 g/dm³

MW CuSO₄ :

$\tt =63.5+32+4* 16=159.5~g/mol$

mol CuSO₄ /dm³ :

$\tt (0.319)/(159.5)=0.002$

CuSO₄⇒Cu²⁺ + SO₄²⁻

mol Cu : mol CuSO₄ = 1 : 1 , so mol Cu²⁺=0.002

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Ethanol contains the elements carbon, hydrogen, and oxygen. When ethanol burns, it chemically reacts with oxygen gas. C2H6O + O2 ethanol oxygen gas What elements will be present in the substances that are created when ethanol burns?

Answers

Answer:

The elements that will be present after the burning of Ethanol are;

(i) Carbon

(ii) Oxygen

(iii) Hydrogen

Explanation:

The balanced chemical equation for the burning of ethanol is as follow;

C₂H₅OH + 3 O₂ → 2 CO₂ + 3 H₂O

It can be observed in given balanced chemical equation that there three elements involved in this entire reaction. The elements that present in the reactant side are also found on the product side. It means that the elements have just rearranged going from reactant to product.

This means that this reaction is obeying Law of Conservation of Mass which states that mass can neither be created nor destroyed but it can be changed from one form to another hence, to keep the mass on both sides of the reaction balanced the same elements should be present on the product side too.

Answer: carbon, hydrogen, and oxygen only

Explanation: When a chemical reaction occurs, the atoms in the original set of substances are rearranged to form a new set of substances. The number of atoms of each element does not change.

The elements carbon, hydrogen, and oxygen are the only elements present in the original substances, so the only elements in the final substances after the reaction will be carbon, hydrogen, and oxygen, as well. The number of atoms of each element must be the same before and after the reaction.

Which statement best describes why carbon can form a wide variety of organic compounds?Each carbon atom ionically bonds with atoms of carbon, hydrogen, oxygen, and nitrogen.

Each carbon atom covalently bonds with atoms of carbon, hydrogen, oxygen, and nitrogen.

Each carbon atom ionically bonds with atoms of oxygen and nitrogen.

Each carbon atom covalently bonds with atoms of oxygen and nitrogen.

Answers

Carbon can form a wide variety of organic compounds because:

Each carbon atom covalently bonds with toms of carbon, hydrogen oxygen, and nitrogen

A carbon atom can have 4 single valence electrons around it. This allows it to form covalent bonds with many different atoms.

Each carbon atom covalently bonds with atoms of carbon, hydrogen, oxygen, and nitrogen describes why carbon can form a wide variety of organic compounds. thus, option B is correct.

What is valency?

Valency is the combining power of an element. Elements in the same group of the periodic table have the same valency. The valency of an element is related to how many electrons are in the outer shell.

Carbon can form a wide variety of organic compounds because Each carbon atom covalently bonds with atoms of carbon, hydrogen oxygen, and nitrogen. a carbon atom can have 4 single valence electrons around it. This allows it to form covalent bonds with many different atoms.

Learn more about the valency of carbon here:

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4-heptanone treated with peroxyacetic acid

Answers

creates a black substance that then hardens

Why must water be heated at about 80 degrees during esterification

Answers

The esters need to evaporate to be smelled.

If an element, X, can form an oxide that has theformula X2O3, then element X would most likely be located on the Periodic Table in the same group as(1) Ba (3) In
(2) Cd (4) Na

Answers

Answer: (3) In

Explanation: As the given compound is $X_2O_3$ , it can be said that X has a valency of 3.

1)Barium (Ba): Atomic no: 56: $Xe6s^2$ : In order to complete its octet, it needs to donate 2 electrons, and thus the valency is 2.

2) Cadmium (Cd) : Atomic no: 48: $Kr5s^24d^(10)$ : In order to complete its octet, it needs to donate 2 electrons, and thus the valency is 2.

3) Indium (In): Atomic no: 49: $Kr5s^25p^(1)$ : In order to complete its octet, it needs to donate 3 electrons, and thus the valency is 3.

4) Sodium (Na): Atomic no: 11: $Ne3s^1$ : In order to complete its octet, it needs to donate 1 electron, and thus the valency is 1.

So the given element could only belong to the group containing Indium (In) as all the elements in the same group exhibit similar valency.

In! This is becasue it has a valency of 3

Rust on weathered rocks is caused by _____.saltation
oxidation
hydrolysis
abrasion

Answers

Rust on weathered rocks is caused by the process of oxidation. Oxidation is a process of chemical weathering that occurs when oxygen combines with minerals in rocks. rust occurs when oxygen combines with iron in rocks to form the reddish brown iron oxide.

Answer: The correct answer is oxidation.

Explanation:

Rust is a reddish-brown colored compound which is formed by the oxidation of Iron to form ferric oxide. The formula for this chemical compound is $Fe-2O_3$

Oxidation is defined as the reaction in which addition of oxygen takes place.

The reaction for the formation of rust is given by the equation, we get:

$4Fe(s)+3O_2(g)\rightarrow 2Fe_2O_3(s)$

By Stoichiometry,

4 moles of iron metal reacts with 3 moles of oxygen gas to form 2 moles of ferric oxide.

Hence, the correct answer is oxidation.

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