Q: Defined as a difference in electric potential energy, a source of what is required in order to produce an electrical current? Read this paragraph and choose the correct option from the provided answers: Current requires a source of voltage, which is a difference in electric potential energy. Sources of voltage include chemical cells and solar cells. Choices: - wattage - momentum - magnetism - voltage A:
voltage

Q: Oxygen, carbon, hydrogen and what other element make up approximately 96% of living matter? Read this paragraph and choose the correct option from the provided answers: Choices: - calcium - helium - silicon - nitrogen A:
nitrogen

Q: What is the term for the use of two or more lewis structures to represent the covalent bonding in a molecule? Read this paragraph and choose the correct option from the provided answers: Resonance is the use of two or more Lewis structures to represent the covalent bonding in a molecule. One of the valid structures is referred to as a resonance structure. It is now understood that the true structure of a molecule which displays resonance is that of an average or a hybrid of all the resonance structures. In the case of the O 3 molecule, each of the covalent bonds between O atoms is best thought of as being "one and a half" bonds, as opposed to either a pure single bond or a pure double bond. This "half-bond" can be shown as a dotted line in both the Lewis structure and the molecular model (see Figure below ). Choices: - reaction - harmony - frequency - resonance A:
resonance

Q: Each gamete will have one copy of each chromosome following which process involving cell division? Read this paragraph and choose the correct option from the provided answers: Figure 7.8 Following meiosis, each gamete has one copy of each chromosome. Nondisjunction occurs when homologous chromosomes (meiosis I) or sister chromatids (meiosis II) fail to separate during meiosis. Choices: - osmosis - genomes - mutations - meiosis A:
meiosis