Question

Two glasses labeled A and B had equal amounts of water. Ted heated the water in one of the glasses. He then put two drops of food coloring into each of the two glasses. The table shows the time taken by the food coloring in the two glasses to spread out. Food Coloring Experiment Glass Time A 25 seconds B 6 seconds Which of the following statements is correct? The water in Glass B was heated; therefore, the particles in Glass B have greater kinetic energy and move faster. The water in Glass A was heated; therefore, the particles in Glass A have greater kinetic energy and move faster. The water in Glass B was heated; therefore, the particles in Glass B move slower. The water in Glass A was heated; therefore, the particles in Glass A move slower.

Answer 1

The correct option is this: THE WATER IN GLASS B WAS HEATED; THEREFORE, THE PARTICLES IN GLASS B HAVE GREATER KINETIC ENERGY AND MOVE FASTER.

When heat is added to a liquid such as water, the heat energy transferred to the liquid usually weaken the attractive forces holding the water molecules together making it possible for the water molecules to overcome the chemical bonds and to move freely and faster with higher kinetic energy.

From the information given in the question, you can see that it takes only 6 seconds for the food coloring particles in glass B to travel round compare to glass A, which takes 25 seconds. This implies that, the water particles in glass A have been heated, they have higher kinetic energy and thus, they are able to carry the food coloring particles round the water in a very short time.