Changes in Matter

Amare, Aaron, Jace, Vivian, and Michael are planning a Thanksgiving dinner together. They start by gathering ingredients for the main course and dessert. They discuss how most ingredients go through both physical and chemical changes as they cook. One of the ingredients for their main course undergoes chemical changes. Which of the following is a chemical change?

• chopping the celery

• cooking the turkey

Nina and Ryan are helping Mr. Harding prepare a Thanksgiving dinner. They start by gathering ingredients for the main course and dessert. They notice that most ingredients go through both physical and chemical changes as they cook. One of the ingredients for their main course undergoes physical changes. Which of the following is a physical change?

• heating sugar to make caramel

• dicing (slicing) an apple

Jace, Nina, Derek, Vivian, and Amare are going on a snowboarding trip with their teacher, Mrs. May, during winter break. On a particularly cold day, Mrs. May prepares a large thermos of hot chocolate for the group. However, after spending a long day outside, they find that the hot chocolate has become only slightly warm. How did the thermal energy move?

• From the cold air to the thermos, and then to the hot chocolate

• From the hot chocolate to the thermos, and then into the cold air

Mrs. Murray wants to teach her students, Jace, Derek, and Vivian, about chemical changes. She decides to use a real-life example in her kitchen. Which of the following demonstrations should she use?

• making two pieces of toast

• boiling water in a pot

Amare wants to make sure he has enough energy for his hike through the woods. He decides to eat plenty of protein and some carbohydrates. What kind of change is going on in his body as he digests the food?

• physical

• chemical

When Ryan cooked dinner for his friends Amare, Vivian, Sienna, and Jace, they were able to gain energy from the food they ate. Where is the energy stored in the food?

• it is not stored in the food

• it is stored in the bonds between the atoms

Vivian and Derek are discussing thermal energy in their science class. They use the terms endothermic and exothermic to explain the change in thermal energy from one substance to another. Vivian puts several ice cubes into a cup of warm tea to show an example of an______ change, and Derek lights a match to show an ______ change.

• exothermic, endothermic

• endothermic, exothermic

11. Aaron saw a homeless person on the street and decided to buy them a meal. This act of kindness is an example of good ________.

• grades

• character

Amare mixed sugar into his coffee. This is an example of a _____ change.

• chemical

• physical

Ryan accidentally dropped his favorite coffee mug in the school cafeteria, and it shattered into many pieces. What kind of change occurred?

• chemical

• physical

• no change