STAAR Science

A student conducts an investigation using caramel candy, paper plates, and a stopwatch. The student places a piece of the caramel candy on each of three plates. The student puts the plates in different locations around the school. The student will record the time it takes for each piece of caramel candy to change state and other observations in the table below.  Which question is the student most likely trying to answer with this investigation?

• In which location does the caramel candy change state the fastest?
• What causes the caramel candy to keep its shape?
• Why does the caramel candy change state?
• At what temperature does the caramel candy melt?

A student observed liquid wax dripping down the side of a burning candle. After putting out the candle’s flame, the student left the room. Several hours later the student observed that there was no longer any liquid on the side of the candle. Which statement explains what most likely happened to the liquid wax?

• The heat given off by the flame caused the candle wax to evaporate.
• The liquid wax changed back into a solid as it cooled.
• The liquid wax condensed and was absorbed by the candle.
• None of the above

How could you show evaporation in the water cycle?

• Place a half cup of water inside a baggie. Tape it to a sunny window. Observe what happens to the water in the cup.   
• Place a thermometer in a sunny window and record the temperature at the same time for 7 days in a row.    
• Record the rainy days and temperature on those days for at least 30 days to get a pattern.    
• Place ices cubes in a baggie. Set the baggie in the freezer. Observe what happens after 7 days.    

The steam seen when water boils is an example of – 

• a gas changing into another gas
• a liquid changing into a gas
• a gas changing into a soli

Ice can be changed to a liquid by which of the following?

• freezing    
• melting    
• boiling    
• stirring    

Which of the following will change liquid water into a gas?

• boiling 
• melting    
• freezing
• stirring   

Water can be changed to a solid by

• heating    
• boiling    
• freezing
• shaking    

Emir mixed 5 drops of blue food coloring in 100 mL of water. He left the container uncovered on a sunny windowsill and checked on it each afternoon. What can Emir conclude happened to the water?

• The amount of water stayed the same.    
• There is more water than when he started the experiment
• The amount of water stayed the same, but it became clear
• There is less water than when he started the experiment

Liquid water can be changed to a gas by which of the following?

• freezing 
• boiling
• melting       

Water in the gas state can be cooled into a liquid by which of the following?

• Melting
• Freezing
• Condensing
• Boiling