Why did the scientist use 2 different methods to create NaCl? 1. They wanted to create a more than just sodium chloride

2. They wanted to see the erlenmeyer flask glow

3. They wanted to obtain a purer product

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

Which of these statements best explains why space exploration should be encouraged? it prepares humans to live without oxygen. it dispel myths about objects in space. it prevents comets and asteroids from striking earth. it creates technology to absorb harmful radiations in space.

What causes the appearance of lines in a emission spectrum