Problem:OPTIONS:
- melted
- eroded
- decayed
- rusted

Answer the following question given this paragraph: Look at this rusty bike. It has been left outside in damp weather too many times, so the iron in the metal parts has rusted. Iron rusts when it combines with oxygen in the air. Iron rusting is an example of a chemical reaction. In a chemical reaction, substances change into entirely different substances. For example, the iron in the bike and the oxygen in the air have changed into rust. Q: A rusty bike has been left outside in damp weather too many times, so the iron in the metal parts have? A:
****
A: rusted

Problem:OPTIONS:
- purple phosphorus
- yellow phosphorous
- green phosphorus
- white phosphorus

Answer the following question given this paragraph: Phosphorus exists as several allotropes, the most common being red, black, and white phosphorus. White phosphorus consists of tetrahedral P4 molecules and melts at 44.15C; it is converted to red phosphorus by heating at 400C for several hours. The chemical differences between red and white phosphorus are considerable: white phosphorus burns in air, whereas red phosphorus is stable; white phosphorus is soluble in organic compounds, whereas red phosphorus is not; white phosphorus melts at 44.15C, whereas red phosphorus melts at 597C. If the enthalpy of fusion of white phosphorus is 0.659 kJ/mol, what is its S? Black phosphorus is even less reactive than red. Based on this information, which allotrope would you predict to have the highest entropy? the lowest? Why?. Q: Phosphorus exists as several allotropes, the most common being red, black, and what? A:
****
A: white phosphorus

Problem:OPTIONS:
- cycles table
- phases table
- species table
- periodic table

Answer the following question given this paragraph: A period is a horizontal row of the periodic table. There are seven periods in the periodic table, with each one beginning at the far left. A new period begins when a new principal energy level begins filling with electrons. Period 1 has only two elements (hydrogen and helium), while periods 2 and 3 have 8 elements. Periods 4 and 5 have 18 elements. Periods 6 and 7 have 32 elements because the two bottom rows that are separated from the rest of the table belong to those periods. They are pulled out in order to make the table itself fit more easily onto a single page. Q: A period is a horizontal row of the what? A:
****
A: periodic table

Problem:OPTIONS:
- atmospheres
- diversity
- biospheres
- landforms

Answer the following question given this paragraph: As we view the land around us we see landforms. Landforms are physical features on Earth's surface. Landforms are introduced in this section but will be discussed more in later chapters. Constructive forces cause landforms to grow. Lava flowing into the ocean can build land outward. A volcano can be a constructive force. Destructive forces may blow landforms apart. A volcano blowing its top off is a destructive force. The destructive forces of weathering and erosion change landforms more slowly. Over millions of years, mountains are worn down by rivers and streams. Q: Physical features on the earth's surface are known as ______ A:
****
A:
landforms