1. Explain the following terms i. Design ii. Possible solution iii. Specification. 2. Give the association of the following colour in nature. i. White ii. Green iii. Red iv. Black ​

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

Compare and contrast physical changes with chemical changes.

The tilt of the earth's axis of rotation is responsible for the a) ocean's tides. b) size of the moon. c) brightness of stars. d) earth’s seasons.