Ch 1.4 Changes in Matter

Which of the following is a chemical change?

• folding a paper airplane

• making kool-aid

• rust forming on a car

• chewing gum

Which of the following is a physical change?

• glue vapor test for fingerprints

• rocks falling down a cliff

• photosynthesis

• burning matches

The mass of steel wool & vinegar in a closed flask is 125 g. After 30 minutes of reacting, the mass is still 125 g. What is the name of the law?

• Law of conservation of mass

• Law of conservation of density

• Law of collateral matter

• Law of stuff staying the same

When there is a physical change, which of the following is NOT true?

• they are the same substances

• they have the same properties

• the shape or appearance changes

• they have new properties

Water turns to ice on a lake in the winter. Which of the following is true?

• it's a physical change, energy is released

• it's a physical change, energy is absorbed

• it's a chemical change, energy is released

• it's a chemical change, energy is absorbed

The total energy of the motion of all of the particles in an object is called

• chemical energy

• kinetic energy

• thermal energy

• dancing energy

Which of the following is an example of an endothermic change?

• condensation

• freezing

• a candle burning

• melting

Which of the following is an example of an exothermic change?

• freezing

• baking bread

• evaporation

• melting

Which of the following is an example of thermal energy?

• energy gained when in warm mud pit

• energy gained when eating burgers

• energy stored in an apple

• energy used to run a 5K

Which of the following is an example of chemical energy?

• dynamite

• exploding dynamite

• jumping into icy water

• cooking eggs on blacktop on hot day