Across
- 4. In Chemistry,a ________ is a material system made up of two or more different substances which are mixed but are not combined chemically.
- 6. what is a radioactive element?
- 8. what is the process that plants produce food?
- 10. what is the first element on the periodic table
Down
- 1. what is the colour of liquid oxygen?
- 2. what is the name of the phenomenon in which light rays are bent?
- 3. combinations of two or more elements
- 5. what are elements made of?
- 7. physical science that studies the composition, structure, properties and change of matter.
- 9. What is the study of matter and energy?