It is used to find the hydrogen ion concentration in a solution i believe
The so-called photoelectric effect
I believe it's (C) Endothermic reaction
Explanation:
When energy is absorbed in an endothermic reaction, the temperature decreases.
Answer: B. (A 25 kg ball)
Explanation:
Since , and velocity is the same for all four balls, the ball with the greatest mass will have the greatest kinetic energy (since mass and KE are directly related). Below shows these calculations:
A. m = 5
B. m = 25
C. m = 10
D. m = 1
Answer:
d. The formation of a covalent bond between two amino acids
Explanation:
In a chemical reaction, a substance transforms into another with different chemical properties and a different formula. Bonds are created and/or destroyed. It must obey the law of conservation of mass and the law of conservation of elements.
<em>Which of the following is a chemical reaction?</em>
<em>a. Making a hydrogen bond between a water molecule and a sugar molecule. </em>NO. This is a physical change in which sugar dissolves in water but both their chemical identities remain the same. The hydrogen bond is a force of attraction and not a real bond in which electrons are gained, lost or shared.
<em>b. The melting of ice.</em> NO. This is a physical change. Solid water turns into liquid water but the identity of the molecules is the same.
<em>c. Changing a carbon atom to a nitrogen atom by radioactive decay.</em> NO. This is a nuclear reaction in which a new element appears but it is not a chemical reaction because it does not fulfill the law of conservation of elements.
<em>d. The formation of a covalent bond between two amino acids.</em> YES. A new bond is created and a protein dimer is formed.