What is the energy of a photon that emits a light of frequency 4.47 x 10^14 Hz?
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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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