I need someone to help me check my answers. If you don’t know the answers please don’t checks them. Lol
1. The cotton or wool fibers in a coat keeps the air between the layers from moving around easily. This insulation is designed to reduce which of the following forms of heat?
A. Conduction
B. Convention*
C. Radiation
D. Touching
2. Which of the following is the best example of an Exothermic reaction that releases energy as radiation?
A. Chemical handwarmers
B. Fireworks
C.Water warmed in microwave*
D. A soda cold in a refrigerator
3. Which of the following has the strongest bonds?
A.SnO (s) -286.2
B. ZnO (s) -348.0
C. NaCl (s) -411.0
D. NaF (s) -569.0*
4. In this reaction 2HgO —> 2Hg+O2 is endothermic, which bonds are the strongest?
A. The bonds between Hg atoms in the soils metal
B. The bonds between Hg&O*
C. The bond between O&O
I don’t have much time left.
I don't agree with your answer for 1. I agree with your answer for 3 and 4. Frankly, I don't think 2 is a valid question for I think it is fraught with inconsistencies in the question.
1. To determine which form of heat the insulation in a coat is designed to reduce, we need to understand the concepts of heat transfer. Conduction refers to the transfer of heat through direct contact, convention refers to the transfer of heat through the movement of a fluid (liquid or gas), radiation refers to the transfer of heat through electromagnetic waves, and "touching" is not a scientific term related to heat transfer.
In this case, the fibers in the coat prevent easy movement of air between the layers, which suggests that the insulation is intended to reduce the transfer of heat through the movement of air (convection). Therefore, the correct answer is B. Convention.
2. To find the best example of an exothermic reaction that releases energy as radiation, we need to consider different examples and their characteristics.
Chemical handwarmers generate heat through a chemical reaction, but they typically do not release energy as radiation. Fireworks release energy in the form of light and heat through combustion, but the release of energy as radiation might not be the primary mechanism. Water warmed in a microwave can release energy as radiation since the microwaves generate electromagnetic waves that heat the water molecules. A soda in a refrigerator does not involve any exothermic reaction.
Therefore, the correct answer is C. Water warmed in a microwave.
3. To determine which compound has the strongest bonds, we need to compare the enthalpy of formation values for the given compounds. The enthalpy of formation (ΔH°f) is the energy change associated with the formation of one mole of a compound from its elements in their standard states.
Comparing the given enthalpy of formation values:
- SnO (s) (-286.2 kJ/mol)
- ZnO (s) (-348.0 kJ/mol)
- NaCl (s) (-411.0 kJ/mol)
- NaF (s) (-569.0 kJ/mol)
A lower enthalpy of formation value indicates stronger bonds. Hence, the correct answer is D. NaF (s) with the most negative value (-569.0 kJ/mol) has the strongest bonds.
4. In the given reaction 2HgO —> 2Hg + O2, if the reaction is endothermic, it means that energy is absorbed during the reaction. To determine which bonds are the strongest, we need to consider the breaking of bonds in the reactant (HgO) and the formation of new bonds in the products (Hg and O2).
In this case, breaking the bonds between Hg and O in HgO requires energy input, while forming the bonds between Hg and O in Hg and O2 releases energy. Therefore, the strongest bonds are the ones between Hg and O in the reactant, and the correct answer is B. The bonds between Hg and O.