Atoms, Elements and Compounds

Which of the following is not evidence that a chemical reaction has occurred?
1. Change of state
2. Colour change
3. Heat, light, sound produced
4. Formation of a precipitate
Use the following information and image to answer the next 2 questions.

Thermite is a mixture of aluminum metal and iron oxide. When the mixture is ignited (usually with a magnesium fuse), a chemical reaction occurs resulting in extremely high temperatures, aluminum oxide and iron. This reaction has been used where welding equipment is not available to repair steel, such as in this railroad track repair.

Which of the following is a product in the thermite reaction?
1. Aluminum oxide
2. Aluminum metal
3. Magnesium
4. Intense heat
Which of the following is a reactant in the thermite reaction?
1. Iron oxide
2. Magnesium
3. Aluminum oxide
4. Iron
This apricot hanging in a orchard in Creston, B.C. is in an advanced state of rot.

Which of the following statements regarding the rotting of the apricot is true?
1. Rotting is a chemical change because of a colour change and the production of gas
2. Rotting is a physical change because of a colour change and the production of gas
3. Rotting is a chemical change because of the formation of a precipitate
4. Rotting is a physical change because of the formation of a precipitate
Which of the following is a physical change?
1. Solid iron ingots melting into molten iron
2. Egg white turning solid white in a frying egg
3. Vinegar added to baking soda produces bubbles
4. The wood of a burning campfire producing heat and light
Which of the following statements regarding physical changes is false?
1. A physical change occurs when two or more materials react and create new materials
2. A physical change can involve a change of state
3. A physical change sometimes occurs when a substance is heated
4. A physical change can involve a substance changing from solid to gas
What type of chemical reaction involves the overall release of energy?
1. Exothermic reaction
2. Endothermic reaction
3. Physical reaction
4. Sublimation reaction
What type of chemical reaction involves the overall absorption of energy?
1. Endothermic reaction
2. Exothermic reaction
3. Physical reaction
4. Sublimation reaction
Which of the following is a chemical change?
1. A rusting bicycle
2. Glass breaking
3. Melting butter for popcorn
4. Mixing sand into water
Which of the following is a physical change?
1. Mixing lemonade powder into water
2. Rotting meat
3. Bleaching brown hair to make it blonde
4. Exploding fireworks

Atoms, Elements and Compounds - Section 3.3 Quiz