Answer: B.) I, II, and III
Explanation:
Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and
for the reaction comes out to be negative.
Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and
for the reaction comes out to be positive.
I) The temperature (of water) increases when calcium chloride dissolves in water : Thus the reaction is exothermic and
for the reaction comes out to be negative.
II) Steam condenses to liquid water : The energy is released when bonds are formed when it coverts from gas to liquid and thus
for the reaction comes out to be negative.
III) Water freezes : The energy is released when bonds are formed to get converted from liquid to solid and thus
for the reaction comes out to be negative.
IV) Dry ice sublimes : The energy is absorbed when bonds are broken to get converted from solid to gas and thus
for the reaction comes out to be positive.
Answer
Omega-3 fatty acid
Explanation:
The monomers are small units or molecules which join with each other end in a huge to end and give rise to the polymers.
DNA and albumin:
If we talk about albumin it is a protein which is present in eggs. All proteins are made up of monomers of amino acids. Similarly, DNA is also a polymer because it is made up hundreds and thousands of small monomeric units called nucleotides.
glycogen:
It is also a biological polymer where several monomer units of glucose are joined together through alpha acetal linkages.
Omega-3 fatty acid:
It is not a polymer. Its a group of fatty acids that contain a double bond at carbon of 3rd position from one end of the carbon chain that was initiated from methyl group and contains one carboxyl group located at the other molecular end. For example: Alpha-Linelenic acid.
Therefore, Omega-3 fatty acid is the right option.
Hope it helps!
The answer is B.Let it sit
Answer:
The potential energy of both toy vehicles (purple and pink) decreased. Since the pink toy was moved closer to the magnet, it will have less potential energy because of the short distance it will take to travel to the magnet. Although the purple toy is now closer to the magnet, it is still pretty far and will have a somewhat big potential energy when traveling to the magnet.
Explanation:
Hey, I'm in middle school and I had the same question for a science test, I'm not sure if I am correct but this is what I have.
Answer:
Valency of the two elements
Explanation:
In order to correctly formularize the compound, the student needs to ask of the valences of the elements involved.
Chlorine has valency of -1, while Barium +2.
The exchange of valency gives the formula
.
Another explanation is that Barium donates 2 electrons which the chlorine atoms accept, in order to form the covalent bond.
I hope this was helpful.