*Question*
Q: What is the term for a process that changes some chemical substances into others? Read this paragraph and choose the correct option from the provided answers: A chemical reaction is a process that changes some chemical substances into others. During a chemical reaction, the reactants are used up to create the products. Choices: - acid reaction - toxic reaction - chain reaction - chemical reaction A:
**Answer**
chemical reaction

*Question*
Q: What do you call the patterns and groups of stars in the sky that ancient people observed and made stories about? Read this paragraph and choose the correct option from the provided answers: The stars that make up a constellation appear close to each other from Earth. In reality, they may be very distant from one another. Constellations were important to people, like the Ancient Greeks. People who spent a lot of time outdoors at night, like shepherds, named the constellations. They told stories about them. Pictured below is one of the most easily recognized constellations ( Figure below ). The ancient Greeks thought this group of stars looked like a hunter. They named it Orion, after a great hunter in Greek mythology. Choices: - planets - meteors - asteroid fields - constellations A:
**Answer**
constellations

*Question*
Q: What can be used to accelerate the rate at which chemical reactions occur? Read this paragraph and choose the correct option from the provided answers: Enzymes increase the rate of chemical reactions by reducing the amount of activation energy needed for reactants to start reacting. One way this can happen is modeled in the Figure below . Enzymes aren't changed or used up in the reactions they catalyze, so they can be used to speed up the same reaction over and over again. Each enzyme is highly specific for the particular reaction is catalyzes, so enzymes are very effective. A reaction that would take many years to occur without its enzyme might occur in a split second with the enzyme. Enzymes are also very efficient, so waste products rarely form. Choices: - hormones - protein - components - enzymes A:
**Answer**
enzymes

*Question*
Q: Drilling wells into hot rocks to release hot water or steam is an example of what kind of power plant? Read this paragraph and choose the correct option from the provided answers: At a geothermal power plant, engineers drill wells into the hot rocks. Hot water or steam may come up through the wells. Alternatively, water may be put down into the well to be heated. It then comes up. The hot water or steam makes a turbine spin. This makes electricity. Pictured below is an example of a geothermal power plant ( Figure below ). Choices: - hydroelectric - solar - fossil fuel - geothermal A:
**Answer**
geothermal