Ques: Answer the following question given this paragraph: Empirical formulas can be determined from the percent composition of a compound. In order to determine its molecular formula, it is necessary to know the molar mass of the compound. Chemists use an instrument called a mass spectrometer to determine the molar mass of compounds. In order to go from the empirical formula to the molecular formula, follow these steps:. Q: In order to determine its molecular formula, it is necessary to know what about the compound? Choices: - lipid mass - polar mass - protons mass - molar mass A:
Ans: molar mass

Ques: Answer the following question given this paragraph: Cardiac muscle is found only in the walls of the heart. It is striated, or striped, because its muscle fibers are arranged in bundles. Contractions of cardiac muscle are involuntary. This means that they are not under conscious control. When cardiac muscle contracts, the heart beats and pumps blood. Q: When cardiac muscle contracts, the heart does what? Choices: - cardiac arrest - irregular heartbeat - heart murmur - pumps blood A:
Ans: pumps blood

Ques: Answer the following question given this paragraph: An atom's protons and electrons carry electrical charges. Protons, with their positive charge, are designated p+. Electrons, which have a negative charge, are designated e. An atom's neutrons have no charge: they are electrically neutral. Just as a magnet sticks to a steel refrigerator because their opposite charges attract, the positively charged protons attract the negatively charged electrons. This mutual attraction gives the atom some structural stability. The attraction by the positively charged nucleus helps keep electrons from straying far. The number of protons and electrons within a neutral atom are equal, thus, the atom's overall charge is balanced. Q: What part of an atom is electrically neutral? Choices: - protons - electrons - newtons - neutrons A:
Ans: neutrons

Ques: Answer the following question given this paragraph: People pollute water when they apply excess chemicals to their lawn. They may also dispose of pollutants incorrectly. Q: What do people apply to their lawns that causes water pollution? Choices: - seeds - manure - water - chemicals A:
Ans:
chemicals