Answer the following question given this paragraph: You have learned that a covalent bond forms when the electron clouds of two atoms overlap with each other. In a simple H 2 molecule, the single electron in each atom becomes attracted to the nucleus of the other atom in the molecule as the atoms come closer together. An optimum distance, equal to the bond length, is eventually attained, and the potential energy reaches a minimum. A stable, single covalent bond has formed between the two hydrogen atoms. Other covalent bonds form in the same way as unpaired electrons from two atoms "match up" to form the bond. In a fluorine atom, there is an unpaired electron in one of the 2p orbitals. When a F 2 molecule forms, the 2p orbitals from each of the two atoms overlap to produce the FF covalent bond. The overlapping orbitals do not have to be of the same type. In a molecule of HF, the 1s orbital of the hydrogen atom overlaps with the 2p orbital of the fluorine atom (see Figure below ). Q: What type of bond forms by unpaired electrons from two atoms "matching up"? Choices: - reactive bond - accretion bond - magnetic bond - covalent bond A:
covalent bond
Answer the following question given this paragraph: Atoms are neutral in electrical charge because they have the same number of negative electrons as positive protons. Therefore, the atomic number of an atom also tells you how many electrons the atom has. This, in turn, determines many of the atom's properties. Q: What are atoms called when they have the same number of negative electrons as positive protons in an electrical charge? Choices: - positive - static - negative - neutral A:
neutral
Q: Answer the following question given this paragraph: Many crops are grown where there isn't enough rainfall for plants to thrive. For example, crops are grown in deserts of the American southwest. How is this possible? The answer is irrigation. Irrigation is any way of providing extra water to plants. Most of the water used in agriculture is used for irrigation. Livestock also use water, but they use much less. Q: What is most of the water used in agriculture used for? Choices: - cleaning - construction - sowing - irrigation A:
A: irrigation
Question: Answer the following question given this paragraph: Cells also divide in order to replace damaged or worn-out cells. Q: What do cells do in order to replace damaged or worn out cells? Choices: - replicate - die - fold - divide A:
Answer: divide
*Question*
Answer the following question given this paragraph: Not all diseases are contagious. A disease that is not contagious is called a noninfectious disease. These diseases are not caused by pathogens. Instead, they are likely to have causes such as lifestyle factors, environmental toxins, or gene mutations. Common types of noninfectious diseases include cancer, diabetes, and immune system diseases. Q: What is the term for a disease that is not contagious? Choices: - uncultured disease - common cold - benign - noninfectious disease A:
**Answer**
noninfectious disease
(Question)
Answer the following question given this paragraph: Immune system organs include bone marrow, the thymus gland, the spleen, and the tonsils. Each organ has a different job in the immune system. Q: Bone marrow, the thymus gland, the spleen, and the tonsils are organs in what body system? Choices: - skeletal system - nervous system - reproductive system - immune system A:
(Answer)
immune system