The sun spectrum is <span>The </span>Sun<span> emits light primarily in the visible </span>spectrum<span>, but it also emits at other wavelengths, as illustrated in the following figure.</span>
Explanation:
18. __Double displacement__ 2LiBr + Pb(NO₃)₂ → PbBr₂ + 2LiNO₃
In a double displacement reaction, there is an actual exchange of partners to form new compounds.
The driving condition for this kind of reaction are:
- formation of an insoluble compound called precipitate
- formation of water or any other non-ionizing compound
- liberation of a gaseous product.
Learn more:
Precipitation reaction brainly.com/question/1870098
19. ___Single displacement___ Fe + 2HCl → FeCl₂ + H₂
In a single displacement reaction, one substance replaces another.
- The replacement of a metallic ion in solution by a metal higher in the activity series than the metal in solution falls into this category.
- The positions of the two elements in the activity series serves as the driving force.
Learn more:
Chemical reactions brainly.com/question/3953793
20. ___Synthesis___ CaO + H₂O → Ca(OH)₂
Synthesis is a combination reaction
- This reaction involves the formation of a single product from two or more reactants.
- A compound forms from the union of two or more reactants
- The large and negative heat of formation of the product is the driving force for this reaction.
Learn more:
Synthesis brainly.com/question/2761166
21. ______Decomposition__ NiCl₂ → Ni + Cl₂
In a decomposition or cracking reaction, two or more product forms from a single reactant.
The breakdown of a compound into its component individual elements or other compounds fall into this category.
- The driving force for this reaction is the high heat of formation of the compound and the extreme instability of the compound.
- A stable compound can also be decomposed on heating and applying pressure.
Learn more:
Thermal decomposition brainly.com/question/11181911
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<h3>
</h3><h3>Given</h3>
v = 20m\s
a = 3m\s^2
t = 4sec
Firstly we have to find u
a = 
3m\s =
12m\s = 20 - u
20 - u = 12m\s
- u = -8
u = 8
Now we can easily find distance by using second equation of motion
s = ut + 1\2 at^2
s = 8(4) + 1\2(3)(16)
s = 32 + 24
s = 56
So distance is 56 m\s hope it helps
Answer:
resonance
Explanation:
The particles of substance B will cause the particle of substance A to vibrate at the same frequency
Answer:
After 1 sec = 4.9 m
After 2 sec = 19.6 m
After 3 sec = 44.1 m
After 4 sec = 78.4 m
After 5 sec = 122.5 m
Explanation:
After 1 sec:
<em>u=0m/s t=1 s a=9.8m/s²</em>
s = ut + (1/2)at²
=0(1) + (1/2)(9.8)(1²) = 4.9m
After 2 sec:
<em>u=0m/s t=2 s a=9.8m/s²</em>
s = ut + (1/2)at²
=0(2) + (1/2)(9.8)(2²) = 19.6m
After 3 sec:
<em>u=0m/s t=3 s a=9.8m/s²</em>
s = ut + (1/2)at²
=0(3) + (1/2)(9.8)(3²) = 44.1m
After 4 sec:
<em>u=0m/s t=4 s a=9.8m/s²</em>
s = ut + (1/2)at²
=0(4) + (1/2)(9.8)(4²) = 78.4m
After 5 sec:
<em>u=0m/s t=5 s a=9.8m/s²</em>
s = ut + (1/2)at²
=0(5) + (1/2)(9.8)(5²) = 122.5m
