True or False. Label each of these statements as true or false. 1. New designs are always complicated.

2. Changes in design can make products easier to use.

3. Cost has no influence on the way objects are designed.

Compare: Answer the following question in 1-3 sentences.

4. The round broom was redesigned into a flat broom. How does the flatter design make sweeping the floor easier?

(Science 7th grade)

The forensic examination of substances involve a preliminary flame test.

Explanation:

The forensic chemical analysis of samples involves the flame testing which is one of the preliminary test. The materials are burned on a flame and the color of the flame is considered indicative of the elements present in the material.

The substances like Borax (sodium borate), Copper(II) sulfate, and boric acid burn with a characteristic green flame.