Across
- 3. During an endothermic reaction, energy is taken i___ from the surroundings.
- 5. When we mix two chemicals together, we say that this has occurred.
- 6. The symbol for oxygen is O2. We say that oxygen has two a________ of oxygen.
- 8. These are made from the reactants in a chemical reaction.
Down
- 1. During every chemical reaction, this is given out to or taken in from the surroundings.
- 2. We react two or more of these together to end up with products.
- 4. What holds two atoms of hydrogen (H2) together? Chemical _________.
- 7. When a chemical reaction occurs, old bonds b______ and new bonds are made.