Answer the following question given this paragraph: Vibrating objects such as drumheads produce sound energy. Q: Vibrating objects such as drumheads produce what? Choices: - negative ions - light - heat - sound energy A:
sound energy
Answer the following question given this paragraph: The oxides of nitrogen(III), nitrogen(IV), and nitrogen(V) react with water and form nitrogen-containing oxyacids. Nitrogen(III) oxide, N2O3, is the anhydride of nitrous acid; HNO2 forms when N2O3 reacts with water. There are no stable oxyacids containing nitrogen with an oxidation state of 4+; therefore, nitrogen(IV) oxide, NO2, disproportionates in one of two ways when it reacts with water. In cold water, a mixture of HNO2 and HNO3 forms. At higher temperatures, HNO3 and NO will form. Nitrogen(V) oxide, N2O5, is the anhydride of nitric acid; HNO3 is produced when N2O5 reacts with water: N 2 O 5(s) + H 2 O(l) 2HNO 3(aq) The nitrogen oxides exhibit extensive oxidation-reduction behavior. Nitrous oxide resembles oxygen in its behavior when heated with combustible substances. N2O is a strong oxidizing agent that decomposes when heated to form nitrogen and oxygen. Because one-third of the gas liberated is oxygen, nitrous oxide supports combustion better than air (one-fifth oxygen). A glowing splinter bursts into flame when thrust into a bottle of this gas. Nitric oxide acts both as an oxidizing agent and as a reducing agent. For example: oxidizing agent: P 4(s) + 6NO(g) P 4 O 6(s) + 3N 2(g). Q: What forms as a result of decomposition when n2o is heated? Choices: - ammonia and nitrogren - nitrogen and hydrogen - calcium and oxygen - nitrogen and oxygen A:
nitrogen and oxygen
Q: Answer the following question given this paragraph: Q: A system in what state cannot spontaneously change, and therefore can do no work? Choices: - equality - balance - stability - equilibrium A:
A: equilibrium
Question: Answer the following question given this paragraph: Q: Tuataras, lizards, and snakes are members of what subclass of reptiles? Choices: - dinosaurs - arthropods - staurikosaurus - lepidosaurs A:
Answer: lepidosaurs
*Question*
Answer the following question given this paragraph: Q: In which human organ do the juveniles develop into sexually mature adults? Choices: - liver - tissues - muscles - intestines A:
**Answer**
intestines
(Q).
Answer the following question given this paragraph: Pressure shows how concentrated the force is on a given area. The smaller the area to which force is applied, the greater the pressure is. Think about pressing a pushpin, like the one in Figure below , into a bulletin board. You apply force with your thumb to the broad head of the pushpin. However, the force that the pushpin applies to the bulletin board acts only over the tiny point of the pin. This is a much smaller area, so the pressure the point applies to the bulletin board is much greater than the pressure you apply with you thumb. As a result, the pin penetrates the bulletin board with ease. Q: What is the effect on pressure when the area of applied force is very concentrated? Choices: - direction increases - pressure disperses - pressure reduces - pressure increases A:
(A).
pressure increases