Answer the following question given this paragraph: Galvanic cells have positive cell potentials, and all the reduction reactions are reversible. The reaction at the anode will be the half-reaction with the smaller or more negative standard reduction potential. Reversing the reaction at the anode (to show the oxidation) but not its standard reduction potential gives: Anode (oxidation):. Q: What kind of cells have positive cell potentials, and all the reduction reactions are reversible? Choices: - new cells - inhibited cells - neutral cells - galvanic cells A:
galvanic cells
(Question)
Answer the following question given this paragraph: The concentration of hydronium ions in a solution is known as acidity. In pure water, the concentration of hydronium ions is very low; only about 1 in 10 million water molecules naturally breaks down to form a hydronium ion. As a result, pure water is essentially neutral. Acidity is measured on a scale called pH , as shown in Figure below . Pure water has a pH of 7, so the point of neutrality on the pH scale is 7. Q: What is the scale on which acidity is measured? Choices: - m - hp - g - ph A:
(Answer)
ph
Ques: Answer the following question given this paragraph: Chemical reactions always involve energy. Energy is a property of matter that is defined as the ability to do work. When methane burns, for example, it releases energy in the form of heat and light. Other chemical reactions absorb energy rather than release it. Q: Chemical reactions always involve what? Choices: - fuel - heating - physical change - energy A:
Ans: energy
(Q).
Answer the following question given this paragraph: Most groundwater does not flow out of an aquifer as a spring or geyser. So to use the water that's stored in an aquifer people must go after it. How? They dig a well. A well is a hole that is dug or drilled through the ground down to an aquifer. This is illustrated in Figure below . Q: How can people access water in an aquifer that does not flow from a spring or a geyser? Choices: - mound building - generate electricity - evaporation - dig a well A:
(A).
dig a well
Ques:Answer the following question given this paragraph: the conscious perception of the how the body interacts with the environment. The visceral senses are most often below the limit of conscious perception because they are involved in homeostatic regulation through the autonomic nervous system. The sensory exam tests the somatic senses, meaning those that are consciously perceived. Testing of the senses begins with examining the regions known as dermatomes that connect to the cortical region where somatosensation is perceived in the postcentral gyrus. To test the sensory fields, a simple stimulus of the light touch of the soft end of a cotton-tipped applicator is applied at various locations on the skin. The spinal nerves, which contain sensory fibers with dendritic endings in the skin, connect with the skin in a topographically organized manner, illustrated as dermatomes (Figure 16.13). For example, the fibers of eighth cervical nerve innervate the medial surface of the forearm and extend out to the fingers. In addition to testing perception at different positions on the skin, it is necessary to test sensory perception within the dermatome from distal to proximal locations in the appendages, or lateral to medial locations in the trunk. In testing the eighth cervical nerve, the patient would be asked if the touch of the cotton to the fingers or the medial forearm was perceptible, and whether there were any differences in the sensations. Q: The visceral senses are most often below the limit of conscious perception because they are involved in this? Choices: - subtle regulation - sensory balance - homeostatic manipulation - homeostatic regulation A:

Ans:homeostatic regulation
Question: Answer the following question given this paragraph: Amphibians were the first animals to have true lungs and limbs for life on land. However, they still had to return to water to reproduce. That's because their eggs lacked a waterproof covering and would dry out on land. The first fully terrestrial vertebrates were amniotes. Amniotes are animals that produce eggs with internal membranes. The membranes let gases but not water pass through. Therefore, in an amniotic egg, an embryo can breathe without drying out. Amniotic eggs were the first eggs that could be laid on land. Q: What were the first animals to have true lungs and limbs for life on land? Choices: - birds - mammals - reptiles - amphibians A:
Answer:
amphibians