Answer:
It declined drastically
Explanation:
The moths were active at night and rested by day on white birch trees, where they were effectively camouflaged from predators.
However, as the city became more industrialized, the trees were covered with black soot from the factories.
The white moths lost their camouflage, so their population declined drastically, as their predators could now find them more easily.
<h3>
Answer:</h3>
Atoms of elements on the reactants side
- 2 Carbon atoms
- 6 Hydrogen atoms
- 7 Oxygen atoms
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Explanation:</h3>
- The equation; C₂H₅OH+ 3O₂ →2CO₂+ 3H₂O is balanced.
- A balanced chemical equation has an equal number of atoms of each element on either side of the equation.
- For example, in the equation given, the number of atoms of each element is equal on both sides of the equation.
- There are 2 carbon atoms, 6 hydrogen atoms, and 7 hydrogen atoms on either side of the equation.
- According to the law of conservation of mass, the mass of the reactants should be equal to the mass of reactants.
- Therefore, chemical equations are balanced for them to obey the law of conservation of mass.
D. Sonic booms. Hope this helps
Answer:
The ice chunk will take 2.47 seconds to hit the water.
Explanation:
Height from which ice chunk fell = h = 30.0 m
Initial velocity of the ice chunk = u = 0 m/s
Time taken by ice chunk to cover 30.0 m of height = t
Acceleration due to gravity = g 
Using second equation of motion ;
The ice chunk will take 2.47 seconds to hit the water.
Answer:
You need to make sure the number of atoms of each element on the reactant side is equal to the number of atoms of each element on the product side. In order make both sides equal, you will need to multiply the number of atoms in each element until both sides are equal. :)
