Answer the following question given this paragraph: Changes of state are physical changes in matter. They are reversible changes that do not change matter's chemical makeup or chemical properties. For example, when fog changes to water vapor, it is still water and can change back to liquid water again. Q: What are reversible physical changes in matter called? A:
OPTIONS:
- chemical change
- alterations
- transformations
- changes of state
changes of state

Answer the following question given this paragraph: Q: How many electrons can be accommodated in the first electron shell's orbital? A:
OPTIONS:
- none
- 1
- 3
- 2

Answer: 2

Question: Answer the following question given this paragraph: Neutron stars are the corpses of stars left over after supernova explosions. They are the size of a small city, but can spin several times per second. (Try to imagine this in your head. ) Consider a neutron star of radius 10 km that spins with a period of 0.8 seconds. Imagine a person is standing at the equator of this neutron star. Calculate the centripetal acceleration of this person and compare it to the acceleration due to gravity on Earth. Q: Neutron stars are the corpses of left over what? A:
OPTIONS:
- planet explosions
- gravitational explosions
- stellar explosions
- supernova explosions
Answer: supernova explosions

input with options: Answer the following question given this paragraph: When a fluorine atom gains an electron, it becomes a negative fluoride ion. Q: When a fluorine atom gains an electron, it becomes a negative what? A:
OPTIONS:
- hydrogen ion
- sulfide ion
- potassium ion
- fluoride ion
output: fluoride ion

Q: Answer the following question given this paragraph: Milk and other dairy foods are not the only sources of calcium. This important nutrient is also found in green leafy vegetables, broccoli, and intact salmon and canned sardines with their soft bones. Nuts, beans, seeds, and shellfish provide calcium in smaller quantities. Except for fatty fish like salmon and tuna, or fortified milk or cereal, vitamin D is not found naturally in many foods. The action of sunlight on the skin triggers the body to produce its own vitamin D (Figure 6.22), but many people, especially those of darker complexion and those living in northern latitudes where the sun's rays are not as strong, are deficient in vitamin D. In cases of deficiency, a doctor can prescribe a vitamin D supplement. Q: The action of sunlight on the skin triggers the body to produce what vitamin? A:

OPTIONS:
- Vitamin A
- metabolic d
- tissue d
- vitamin d

A: vitamin d

Answer the following question given this paragraph: Mesophiles grow best in moderate temperature, typically between 25C and 40C (77F and 104F). Mesophiles are often found living in or on the bodies of humans or other animals. The optimal growth temperature of many pathogenic mesophiles is 37C (98F), the normal human body temperature. Mesophilic organisms have important uses in food preparation, including cheese, yogurt, beer and wine. Q: What type of organism is commonly used in preparation of foods such as cheese and yogurt? A:
OPTIONS:
- protozoa
- gymnosperms
- viruses
- mesophilic organisms
mesophilic organisms