input with options: Answer the following question given this paragraph: 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. Q: Chemical equations in which heat is shown as either a reactant or a product are called what? A:
OPTIONS:
- hydroelectric equations
- thorium equations
- feedstock equations
- thermochemical equations
output: thermochemical equations

Q: Answer the following question given this paragraph: Remember that a phase change depends on the direction of the heat transfer. If heat transfers in, solids become liquids, and liquids become solids at the melting and boiling points, respectively. If heat transfers out, liquids solidify, and gases condense into liquids. Q: What type of direction does a phase change depend on? A:

OPTIONS:
- weight transfer
- power transfer
- humidity transfer
- heat transfer

A: heat transfer

input: OPTIONS:
- liquid
- parameters
- metals
- indicators Now, answer this question: Answer the following question given this paragraph: Certain compounds, called indicators, change color when bases come into contact with them, so they can be used to detect bases. An example of an indicator is a compound called litmus. It is placed on small strips of paper that may be red or blue. If you place a few drops of a base on a strip of red litmus paper, the paper will turn blue. You can see this in the Figure below . Litmus isn't the only detector of bases. Red cabbage juice can also detect bases, as you can see in this video: http://www. youtube. com/watch?v=vrOUdoS2BtQ . Q: What kind of compounds change color when bases come into contact with them, so they can be used to detect bases? A:
A:
output: indicators

Answer the following question given this paragraph: Fragmentation occurs when a parent organism breaks into fragments, or pieces, and each fragment develops into a new organism. Starfish, like the one in Figure below , reproduce this way. A new starfish can develop from a single ray, or arm. Starfish, however, are also capable of sexual reproduction. Q: What occurs when a parent organism breaks into fragments, or pieces, and each fragment develops into a new organism? A:

OPTIONS:
- erosion
- absorption
- sollution
- fragmentation

Answer: fragmentation

Problem: OPTIONS:
- topographic
- basic
- country
- bathymetric
Q: Answer the following question given this paragraph: Oceanographers use bathymetric maps to show the features of the bottom of a body of water. Q: What kind of map can show the features of the bottom of a body of water? A:
Answer: bathymetric

Answer the following question given this paragraph: Metals such as iron are useful for many purposes because of their unique properties. For example, they can conduct electricity and bend without breaking. However, pure metals may be less useful than mixtures of metals with other elements. For example, adding a little carbon to iron makes it much stronger. This mixture is called steel. Steel is so strong that it can hold up huge bridges, like the one pictured above. Steel is also used to make skyscrapers, cargo ships, cars, and trains. Steel is an example of an alloy. Q: Adding carbon to iron makes what type of metal? A:

OPTIONS:
- ions
- titanium
- plastic
- steel

Answer:
steel