Choose the word that best completes this sentence. Welding in confined spaces or on stainless steel generates _____________ a ve
2 answers:
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<u>Answer:</u> The correct answer is Option E.
<u>Explanation:</u>
Every balanced chemical equation follows law of conservation of mass.
This law states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.
This also means that total mass on the reactant side must be equal to the total mass on the product side.
The balanced chemical equation for the reaction of aluminium and water follows:
The coefficient of Aluminium is 2.
Hence, the correct answer is Option E.
1 Double displacement
2 A) a reaction in which the exchange of electrons (or oxygen) occurs
3 A) Silver has a lower activity than hydrogen and cannot replace it.
4 C) 2C₂H₆ + 7O₂ → 4CO₂ +6H₂O
5. two
6.C) redox
7.B) The ions of two ionic compounds switch places and a gas is formed.
Explanation:
Problem 1:
Equation of the reaction:
Na₂S + Cd(NO₃)₂→CdS + 2NaNO₃
The above reaction is a double displacement reaction in which ions of two ionic compounds changes position to form new products.
A double displacement reaction is also known as metathesis.
- The reaction involves actual exchange of partners to form new products.
- In most double displacement reactions, precipitates are usually formed.
- There might also be formation of water and any non-ionizing compound.
- liberation of a gaseous product.
Learn more:
precipitates brainly.com/question/8896163
Question 2
A) a reaction in which the exchange of electrons (or oxygen) occurs:
Redox reactions are reactions in which one species is reduced and another species is oxidized simultaneously.
- In this reaction types, there is exchange of electrons between reacting species.
- In non-redox reactions, there is no exchange or transfer of electrons.
- Redox reactions involves the transfer of electrons in which a specie gains and the other loses.
Learn more:
Oxidation brainly.com/question/2086855
Question 3:
A) Silver has a lower activity than hydrogen and cannot replace it.
H₂O + Ag→no reaction
The reaction above is a single replacement reaction
- The replacement of a metallic ion in solution by a metal higher in the activity series than the metal in solution is this kind of reaction.
- The positions of the two elements in the activity series provides the driving force for this reaction.
- Hydrogen is higher than Ag in the reactivity series.
- Since hydrogen is more reactive, Silver cannot displace it and the reaction will not occur.
Learn more:
Reactivity brainly.com/question/2193659
Question 4:
4 C) 2C₂H₆ + 7O₂ → 4CO₂ +6H₂O
Solution:
C₂H₆ + O₂→CO₂+H₂O
For combustion reactions in hydrocarbons, we use the expression below:
CₓHₙ + x + O₂ → xCO₂ +
H₂O
x = 2 , n = 6
x + = 2 +
=
=
= 3
multiply the coefficients by 2:
2, 7, 4 and 6
learn more:
Combustion brainly.com/question/1971314
Question 5
four
2NaNO₃ + CaCl₂ → 2NaCl + Ca(NO₃)₂
To find the number of atoms of Na, we must understand what an atom really is;
An atom is the smallest particle of an atom that takes part in chemical reaction. Distinct elements are made up unique types of atoms.
In the above reaction, we have:
2moles of NaNO₃ on the left hand side:
we have 2 Atoms of Na,
2 atoms N
6 atoms of O
2 moles of NaCl contains:
2 atoms of Na
2 atoms of Cl
In all, we have 4 atoms of Na
learn more:
Atoms brainly.com/question/10216585
Question 6
C) redox
AgNO₃(aq)+Cu(s)→Ag(s)+Cu(NO₃)₂(aq)
In a redox reaction, a specie is reduced and another is oxidized in the reaction.
- In this reaction, one specie loses electrons and the other gains it.
- Certain reactants change their oxidation state so as to form products.
In the reaction above,
Ag undergoes reduction; it goes from Ag⁺ to Ag from a +1 to zero.
whereas Copper goes from O to 2+ oxidation state.
Actually, this reaction is more appropriately described as a single displacement reaction in which atom higher in the activity series displaces the lower one.
learn more:
Redox Oxidation brainly.com/question/2086855
Question 7:
B) The ions of two ionic compounds switch places and a gas is formed.
- A double displacement reaction is also known as metathesis or double replacement reaction.
- It usually involves ionic compounds.
- The reaction involves an exchange of partners to form new compounds.
One of the following serves as driving force for double displacement reactions:
- formation of an insoluble compound called precipitate
- formation of water or any other non-ionizing compound
- liberation of a gaseous product.
Learn more:
Precipitate formation brainly.com/question/8896163
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