1. Which is conduction?
A. energy transfer from a reaction system to its surroundings
B. energy transfer as electromagnetic waves
C. energy transfer by currents of moving liquid or gas
D. energy transfer by direct contact
2. What is a chemical reaction system?
A. the reactants and products in a reaction
B. a diagram used to show energy changes in a reaction
C. everything outside the reaction
D. a container in which chemical reactions take place
3. In photosynthesis within one plant, other plants would be considered the _____
A. products.
B. system.
C. reactants.
D. surroundings.
4. The products of a particular reaction have more energy than the reactants. Which type of reaction has occurred?
A. convection
B. exothermic
C. radiation
D. endothermic
5. Which type of reaction is occurring during a fireworks show? How do you know?
A. It is an endothermic reaction. Fireworks are bright, indicating a release of light energy.
B. It is an exothermic reaction. Fireworks are bright, indicating a release of light energy.
C. It is an exothermic reaction. Heat must be added to light the fuses of the fireworks.
D. It is an endothermic reaction. Heat must be added to light the fuses of the fireworks.
PLZ HELP