Answer the following question given this paragraph: Hydrocarbons are compounds that contain only carbon and hydrogen. Hydrocarbons are the simplest type of carbon-based compounds. Nonetheless, they can vary greatly in size. The smallest hydrocarbons have just one or two carbon atoms, but large hydrocarbons may have hundreds. The size of hydrocarbon molecules influences their properties. For example, it influences their boiling and melting points. As a result, some hydrocarbons are gases at room temperature, while others are liquids or solids. Hydrocarbons are generally nonpolar and do not dissolve in water. In fact, they tend to repel water. That's why they are used in floor wax and similar products. Q: What is the simplest type of carbon-based compounds? A:
OPTIONS:
- Buckminsterfullerine
- graphite
- particles
- hydrocarbons
hydrocarbons

Answer the following question given this paragraph: Summary Changes of state are examples of phase changes, or phase transitions. All phase changes are accompanied by changes in the energy of a system. Changes from a more-ordered state to a less-ordered state (such as a liquid to a gas) areendothermic. Changes from a less-ordered state to a more-ordered state (such as a liquid to a solid) are always exothermic. The conversion of a solid to a liquid is called fusion (or melting). The energy required to melt 1 mol of a substance is its enthalpy of fusion (Hfus). The energy change required to vaporize 1 mol of a substance is the enthalpy of vaporization (Hvap). The direct conversion of a solid to a gas is sublimation. The amount of energy needed to sublime 1 mol of a substance is its enthalpy of sublimation (Hsub) and is the sum of the enthalpies of fusion and vaporization. Plots of the temperature of a substance versus heat added or versus heating time at a constant rate of heating are calledheating curves. Heating curves relate temperature changes to phase transitions. A superheated liquid, a liquid at a temperature and pressure at which it should be a gas, is not stable. A cooling curve is not exactly the reverse of the heating curve because many liquids do not freeze at the expected temperature. Instead, they form a supercooled liquid, a metastable liquid phase that exists below the normal melting point. Supercooled liquids usually crystallize on standing, or adding a seed crystal of the same or another substance can induce crystallization. Q: Changes from a less-ordered state to a more-ordered state (such as a liquid to a solid) are always what? A:
OPTIONS:
- unbalanced
- reactive
- endothermic
- exothermic

Answer: exothermic

Question: Answer the following question given this paragraph: Adulthood is divided into the stages of early, middle, and late adulthood. Q: Adulthood is divided into how many stages? A:
OPTIONS:
- two
- four
- five
- three
Answer: three

input with options: Answer the following question given this paragraph: Potential energy due to the position of an object above Earth is called gravitational potential energy. Like the leaves on trees, anything that is raised up above Earth's surface has the potential to fall because of gravity. You can see examples of people with gravitational potential energy in Figure below . Q: What is the term for potential energy due to the position of an object above earth? A:
OPTIONS:
- gravitational pull energy
- gravitational indication energy
- gravitational recovery energy
- gravitational potential energy
output: gravitational potential energy

Q: Answer the following question given this paragraph: Not getting enough vitamins can cause health problems. For example, too little vitamin C causes a disease called scurvy. People with scurvy have bleeding gums, nosebleeds, and other symptoms. Q: What disease, caused by vitamin c deficiency, causes bleeding gums, nosebleeds, and other symptoms? A:

OPTIONS:
- rickets
- dehydration
- leukemia
- scurvy

A: scurvy

Answer the following question given this paragraph: At the end of the Cretaceous Period, or 65 million years ago, all dinosaurs (except those which led to birds) went extinct. Some scientists believe a possible cause is a collision between the Earth and a comet or asteroid. The collision could have caused tidal waves, changed the climate, increased atmospheric dust and clouds, and reduced sunlight by 10-20%. A decrease in photosynthesis would have resulted in less plant food, leading to the extinction of the dinosaurs. Q: All dinosaurs (except those which led to birds) went extinct at the end of which period? A:
OPTIONS:
- Tertiary
- Jurassic
- Paleogene
- cretaceous
cretaceous