Question

after reading lesson 1.3, answer the following questions.
an experimental approach to science

1. practical alchemy focused on ____________________.
2. alchemists developed processes for separating ______ and purifying ______.
3. how did lavoisier help to transform chemistry?
4. circle the letter of the word that completes the sentence. lavoisier demonstrated that ______ is necessary for materials to burn.

a. phlogiston
b. nitrogen
c. oxygen
d. metals
the scientific method

1. what is the scientific method?
2. complete the flowchart about the scientific method.

Explanation:

Question 4

To determine the correct answer, we recall the role of oxygen in combustion. Lavoisier's work showed that oxygen is required for materials to burn. Phlogiston was a discredited theory, nitrogen is not involved in combustion, and metals are not the substance needed for burning. So the correct option is c.

Answer:

c. oxygen