Answer the following question given this paragraph: Not all atoms of an element must have precisely the same mass. Atoms of one element can be transformed into another through nuclear reactions. The compositions of many solid compounds are somewhat variable. Under certain circumstances, some atoms can be divided (split into smaller particles). These modifications illustrate the effectiveness of the scientific method; later experiments and observations were used to refine Dalton's original theory. Q: Atoms of one element can be transformed into another through which process? Choices: - magnetic reactions - longer reactions - developed reactions - nuclear reactions A:
nuclear reactions

Answer the following question given this paragraph: An aldehyde is a carbonyl in which the carbon atom is bonded to one carbon atom and one hydrogen atom (or two hydrogen atoms, see below). Because the hydrogen atom is so small, the partial positive charge on the carbonyl carbon is very easy for other molecules to approach, making aldehydes a particularly reactive type of carbonyl. Aldehydes are versatile reactants for a wide variety of organic syntheses. Many aldehydes also have distinctive flavors and aromas. For example, the flavor of cinnamon is primarily due to the molecule cinnamaldehyde, and vanillin is the aldehyde most responsible for the smell and taste of vanilla extract. Q: Name a carbonyl in which the carbon atom is bonded to one carbon atom and one hydrogen atom (or two hydrogen atoms). Choices: - ketone - acetylcholine - ester - aldehyde A:
aldehyde

Answer the following question given this paragraph: A cyclic hydrocarbon is a hydrocarbon in which the carbon chain joins to itself in a ring. A cycloalkane is a cyclic hydrocarbon in which all of the carbon-carbon bonds are single bonds. Like other alkanes, cycloalkanes are saturated compounds. Cycloalkanes have the general formula of C n H 2n . The simplest cycloalkane is cyclopropane, a three-carbon ring. Q: What is a hydrocarbon in which the carbon chain joins to itself in a ring? Choices: - asymmetrical hydrocarbon - circular hydrocarbon - acid hydrocarbon - cyclic hydrocarbon A:
cyclic hydrocarbon