Answer the following question given this paragraph: Chemists often need to know what elements are present in a compound and in what percentage. The percent composition is the percent by mass of each element in a compound. It is calculated in a similar way that we just indicated for the peanut butter. Q: What term means the percent by mass of each element in a compound? A:
OPTIONS:
- molecular composition
- calculated composition
- mass composition
- percent composition
percent composition

Answer the following question given this paragraph: Q: Which stage has already been completed by the time sea urchin eggs are released from the female? A:
OPTIONS:
- fetus
- secondary
- mitoses
- meiosis

Answer: meiosis

Question: Answer the following question given this paragraph: Beta decay occurs when an unstable nucleus emits a beta particle and energy. A beta particle is an electron. It has a charge of -1. In nuclear equations, a beta particle is represented by the symbol . The subscript -1 represents the particle's charge, and the superscript 0 shows that the particle has virtually no mass. Nuclei contain only protons and neutrons, so how can a nucleus emit an electron? A neutron first breaks down into a proton and an electron (see Figure below ). Then the electron is emitted from the nucleus, while the proton stays inside the nucleus. The proton increases the atomic number by one, thus changing one element into another. Q: What occurs when an unstable nucleus emits a beta particle and energy? A:
OPTIONS:
- nucleus decay
- alpha decay
- methane decay
- beta decay
Answer: beta decay

input with options: Answer the following question given this paragraph: A vesicle is a small, spherical compartment that is separated from the cytosol by at least one lipid bilayer. Many vesicles are made in the Golgi apparatus and the endoplasmic reticulum, or are made from parts of the cell membrane by endocytosis. Vesicles can also fuse with the cell membrane and release their contents to the outside. This process is called exocytosis. In addition to the Golgi apparatus and ER, vesicles can also fuse with other organelles within the cell. Q: What is a small, spherical compartment separated by at least one lipid layer from the cytosol? A:
OPTIONS:
- capillary
- cuticle
- cortex
- vesicle
output: vesicle

Q: Answer the following question given this paragraph: Schrodinger developed an equation that could be used to calculate the chances of an electron being in any given place around the nucleus. Based on his calculations, he identified regions around the nucleus where electrons are most likely to be. He called these regions orbitals . As you can see in the Figure below , orbitals may be shaped like spheres, dumbbells, or rings. In each case, the nucleus of the atom is at the center of the orbital. You can see animated models of orbitals this URL: http://www. chemistry. wustl. edu/~edudev/Orbitals/movie. html . Q: What term did schrodinger use for regions around the nucleus where electrons are most likely to be? A:

OPTIONS:
- arrays
- isotopes
- ellipses
- orbitals

A: orbitals

Answer the following question given this paragraph: The skeletal system protects the soft organs of the body. For example, the skull surrounds and protects the brain. The ribs protect the heart and lungs. Q: What system protects the soft organs of the body? A:
OPTIONS:
- nervous system
- digestive system
- Cardiovascular system
- skeletal system
skeletal system