Question: Q: What usually causes fractures on a bone? Read this paragraph and choose the correct option from the provided answers: Even though they are very strong, bones can fracture , or break. Fractures can happen at different places on a bone. They are usually caused by excess bending stress on the bone. Bending stress is what causes a pencil to break if you bend it too far. Choices: - compressive stress - shear stress - extra weight - excessive bending stress A:
Answer: excessive bending stress

Question: Q: Chemical equations in which heat is shown as either a reactant or a product are called what? Read this paragraph and choose the correct option from the provided answers: 2Al(s) + Fe2O3(s) 2Fe(s) + Al2O3(s) + heat to indicate that heat is one of the products. Chemical equations in which heat is shown as either a reactant or a product are called thermochemical equations. In this reaction, the system consists of aluminum, iron, and oxygen atoms; everything else, including the container, makes up the surroundings. During the reaction, so much heat is produced that the iron liquefies. Eventually, the system cools; the iron solidifies as heat is transferred to the surroundings. A process in which heat (q) is transferred from a system to its surroundings is described as exothermic. By convention, q < 0 for an exothermic reaction. Choices: - hydroelectric equations - thorium equations - feedstock equations - thermochemical equations A:
Answer: thermochemical equations

Question: Q: In order to determine its molecular formula, it is necessary to know what about the compound? Read this paragraph and choose the correct option from the provided answers: 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:. Choices: - lipid mass - polar mass - protons mass - molar mass A:
Answer:
molar mass