help with applied research and physical/chemical change

Question

1.  what is an example of physical change in matter?

 

a.  grinding coffee beans into coffee grinds

b.  freezing water

c.  distilling salt water so that he water boild off and solt remains

d.  all of these

 

I think the answer is b?

 

2.  what is an example of a chemical change in matter?

 

a. burning wood until it becomes ashes

b.  combing nitrogen and oxygen gases to make ammonia (NH₂)

c.  adding baking soda to flour and water to make bubbles so that bread will rise

d.  all of these

 

I think the answer is a?

 

3.  what is an example of applied research

 

a. studying the chemical structure of a substance

b.  using the knowledge of the chemical structure of a substance to develope a new drug

c.  carrying out a common chemical reaction

d.  all of these

 

I know the answer b is a choice

 

thanks

Answer 1

B. Freezing water