Which of the following is an example of a physical change but not a chemical change?
a) the log gives off heat and light as it burns
b) a tree stores energy from the sun in its fruit
c) a penny lost in the grass slowly changes color
d) a water pipe freezes and cracks on a cold night

Sort the images based on whether there's a force of attraction or repulsion between the magnets shown. attraction repulsion

Which best describes what forms in nuclear fission? a. two smaller, more stable nucleib. two larger, less stable nucleic. one smaller, less stable nucleusd. one larger, more stable nucleus

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.