Answer : The correct option is, (D) double replacement reaction
Explanation :
Synthesis reaction : A chemical reaction where multiple substances or reactants combine to form a single product.
It is represented as,
Decomposition reaction : A chemical reaction in which larger reactant decomposes to give two or more than two products.
It is represented as,
Single replacement reaction : A chemical reaction in which the more reactive element replace the less reactive element.
It is represented as,
In this reaction, A is more reactive element and B is less reactive element.
Double replacement reaction : It is a type of chemical reaction where a positive cation and a negative anion of two reactants exchange places to form two new products.
It is represented as,
(X and A are the cations, Y and B are the anions)
The given reaction is:
This reaction is a double displacement reaction.
Answer:
Explanation:
The first thing we need to do is to convert the wavelength to meters. We should remember that 1 meter is 1x10^9 nm so:
∧ = 150 nm / 1x10^9 nm = 1.5x10^-7 m
The formula for Energy in this case is:
E = hc/∧
We already know that c is the speed of light, which is 3x10^8 m/s and h is the planck constant which is 6.63x10^-34 J.s
Replacing data in the above formula:
E = 6.63x10^-34 * 3x10^8 / 1.5x10^-7 = 1.33x10^-18 J per photon.
Now finally to calculate the carbon atoms present in the sample, let's calculate the number of photons:
n° of photons = 1.98x10^5 / 1.33x10^-18
n° of photons = 1.49x10^23 photons
The exercise states that one atom emits on photon, so we can assume that this final result would be the number of carbon atoms present in the sample.
Answer:
carbon, hydrogen, and oxygen atoms
Explanation:
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2 PO₄³⁻ (aq) + 3 Co²⁺ (aq) → Co₃(PO₄)₂ (s)
Explanation:
molecular equation:
2 Na₃PO₄ + 3 CoCl₂ → Co₃(PO₄)₂ + 6 NaCl
ionic equation:
6 Na⁺ (aq) + 2 PO₄³⁻ (aq) + 3 Co²⁺ (aq) + 6 Cl⁻ (aq) → Co₃(PO₄)₂ (s) + 6 Na⁺ (aq) + 6 Cl⁻ (aq)
we remove the spectator ions to get the net ionic equation:
2 PO₄³⁻ (aq) + 3 Co²⁺ (aq) → Co₃(PO₄)₂ (s)
were:
(aq) - aqueous
(s) - solid
Learn more about:
net ionic equation
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