Chemical changes involve the breaking and making of chemical bonds.

a) always
b) never
c) sometimes

fill in the blank

Is a pencil falling to the floor anon contact force, a force, or a contact force

In a ball-and-stick molecular model, what do the sticks represent?

In what way do investigations build scientific knowledge? the results of investigations lead to questions that cannot be tested. they reflect the opinions and social values of scientists, ensuring valid information. the results of investigations lead to new questions, which lead to new investigations. they are not influenced by the research of earlier scientists, so they are able to address gaps in understanding. i