Which is a example of a chemical change a. mixing of poster colors b. formation of clouds c. metal corroding in salt water d. sugar dissolving in water e. separating salt water from sea water

Apropane torch is lit inside a hot air balloon during preflight preparations to inflate the balloon. which condition of the gas remains constant

In a modern periodic table, there are seven periods. a period is any horizontal row of the periodic table, and the elements in a period have consecutive atomic numbers. a group is any vertical column in the periodic table, and there are 18 such groups. groups 3–12, also known as the “b” group elements, are called transition metals. groups 1–2 and 13–18, also known as the “a” group elements, are sometimes called the main groups. metals are characterized by malleability, ductility, conductivity, and a tendency to lose electrons. main group metals are found in groups 1 and 2. nonmetallic elements fall on the right-hand side of the periodic table, that is, groups 13–18. nonmetals have the tendency to gain electrons and are generally brittle. they can be solids, liquids, or gasses at room temperature. now, label the areas of the modern periodic table using the above information. drag the appropriate labels to their respective targets.

Which sentence best explains the high melting point, boiling point, and surface tension of water? a. the hydrogen atom on each water molecule is strongly attracted to the hydrogen atoms on nearby molecules. b. ions dissolved in the water cause nearby molecules to become temporarily polar. c. the water molecules are connected to each other with covalent bonds. d. water molecules that have lost electrons attract the water molecules that have gained electrons. e. the negative side of each water molecule is attracted to the positive sides of nearby molecules.