Answer the following question given this paragraph: A mixture is a combination of two or more substances in any proportion. This is different from a compound, which consists of substances in fixed proportions. The substances in a mixture also do not combine chemically to form a new substance, as they do in a compound. Instead, they just intermingle and keep their original properties. The lemonade pictured above is a mixture because it doesn't have fixed proportions of ingredients. It could have more or less lemon juice, for example, or more or less sugar, and it would still be lemonade. Q: In what do substances combine chemically to form a new substance? Choices: - suspension - component - element - compound A:
compound

Answer the following question given this paragraph: The increase in electrons across the periodic table explains why elements go from metals to metalloids and then to nonmetals from left to right across the table. Look at period 2 in Figure below as an example. Lithium (Li) is a metal, boron (B) a metalloid, and fluorine (F) and neon (Ne) are nonmetals. The inner energy level is full for all four elements. This level has just one orbital and can hold a maximum of two electrons. The outer energy level is a different story. This level has four orbitals and can hold a maximum of eight electrons. Lithium has just one electron in this level, boron has three, fluorine has seven, and neon has eight. Q: An increase in what, across the periodic table, explains why elements go from metals to metalloids and then to nonmetals? Choices: - neutrons - temperature - protons - electrons A:
electrons

Answer the following question given this paragraph: A: The energy is stored in the bonds of the products as chemical energy. In an endothermic reaction, the products have more stored chemical energy than the reactants. This is represented by the graph on the left in the Figure below . In an exothermic reaction, the opposite is true. The products have less stored chemical energy than the reactants. You can see this in the graph on the right in the Figure below . Q: Endothermic and exothermic reactions differ in whether the products or reactants store more of what? Choices: - Motion energy - Thermal energy - Kinetic Energy - chemical energy A:
chemical energy