B) a white dwarf is stronger than a supergiant, and if it closer to the earth a star has more magnitude so it is B
The reaction between ethanol C2H5OH and water H2O is a chemical reaction and is exothermic.
Option A is correct.
<h3>What is a chemical reaction?</h3>
A chemical reaction is a rearrangement between the ions and molecules of a substance. For a chemical reaction to take place, bonds are broken in the reactants and new bonds are formed in the products.
The chemical reaction between ethanol and water is;
- This reaction is exothermic because molecules move from a higher state of energy to lower states.
- The resulting volume is also lesser than the initial volumes of the reactants according to Henry's Law, showing that heat is given off to the walls of the container.
Therefore, we can conclude that A chemical reaction occurs, as evidenced by the volume of the resultant mixture being less than the total volume of the initial components.
Learn more about the chemical reaction here:
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Answer:
Science has discovered that sub-concussive blows to the head are causing as much neurological damage as a full on concussion. ... The discovery of this knowledge brought a new light to how even though athletes are not showing signs of full blown concussions, the average hits they take on are causing repetitive damage.
Explanation:
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In the first image attached, the correct option is option c: which is 2.
<h3>What is multiplication in math?</h3>
In mathematics, multiplication is seen to be a very popular tool.
It is known to be a method that is said to be used in finding the outcome of the product of two or more numbers.
It is also known to be one of the basic types of arithmetic operations, that we use.
In the question, we see that the number progresses from -6 to -12 and to -24 and this is one that is largely due to the multiplication by 2.
Therefore, In the first image attached, the correct option is option c which is 2.
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Answer:
Hydrogen could become a future energy source as it can be used to create steam, electricity and other forms of energy. Hydrogen is also considered a clean form of energy, as its only product is water, which is harmless.
Explanation:
