Answer the following question given this paragraph: Carbon is a nonmetal in group 14 of the periodic table. Like other group 14 elements, carbon has four valence electrons. Valence electrons are the electrons in the outer energy level of an atom that are involved in chemical bonds. The valence electrons of carbon are shown in the electron dot diagram in the Figure below . Q: What do you call the electrons in the outer energy level of an atom that are involved in chemical bonds? Choices: - force electrons - helium electrons - transitions electrons - valence electrons A:
valence electrons
(Question)
Answer the following question given this paragraph: Air movement takes place in the troposphere. Air moves because of differences in heating. The differences create convection currents and winds. Q: What is the primary cause of air movement in the troposphere? Choices: - solar winds - asteroids - the ozone layer - differences in heating A:
(Answer)
differences in heating
Ques: Answer the following question given this paragraph: The simplest organic compounds are those composed of only two elements: carbon and hydrogen. These compounds are called hydrocarbons. Hydrocarbons themselves are separated into two types: aliphatic hydrocarbons and aromatic hydrocarbons. Aliphatic hydrocarbons are hydrocarbons based on chains of C atoms. There are three types of aliphatic hydrocarbons. Alkanes are aliphatic hydrocarbons with only single covalent bonds. Alkenes are hydrocarbons that contain at least one CC double bond, and alkynes are hydrocarbons that contain a CC triple bond. Occasionally, we find an aliphatic hydrocarbon with a ring of C atoms; these hydrocarbons are calledcycloalkanes (or cycloalkenes or cycloalkynes). Aromatic hydrocarbons have a special six-carbon ring called a benzene ring. Electrons in the benzene ring have special energetic properties that give benzene physical and chemical properties that are markedly different from alkanes. Originally, the term aromatic was used to describe this class of compounds because they were particularly fragrant. However, in modern chemistry the term aromatic denotes the presence of a six-membered ring that imparts different and unique properties to a molecule. The simplest alkanes have their C atoms bonded in a straight chain; these are callednormal alkanes. They are named according to the number of C atoms in the chain. The smallest alkane is methane:. Q: The simplest organic compounds have hydrogen and what else? Choices: - sodium - oxygen - nitrogen - carbon A:
Ans: carbon
(Q).
Answer the following question given this paragraph: Electrons in the outermost energy level of an atom are called valence electrons. They determine many of the properties of an atom, including how reactive it is. Q: What do you call the electrons in the outermost energy level of an atom? Choices: - Inner electrons - shell electrons - Proper electrons - valence electrons A:
(A).
valence electrons
Ques:Answer the following question given this paragraph: A chemical reaction occurs when some substances change chemically to other substances. Chemical reactions are represented by chemical equations. Q: What occurs when some substances change chemically to other substances? Choices: - toxic reaction - spontaneous mutation - hormonal reaction - chemical reaction A:

Ans:chemical reaction
Answer the following question given this paragraph: Rainwater absorbs carbon dioxide (CO 2 ) as it falls. The CO 2 combines with water to form carbonic acid. The slightly acidic water is especially good at dissolving the rock limestone. Groundwater creates landforms by dissolving away rock. Q: Rainwater absorbs carbon dioxide (co 2 ) as it falls. the co 2 combines with water to form what? Choices: - carbon monoxide - nitrate acid - methane gas - carbonic acid A:
carbonic acid