Why has the arrangement of the periodic table changed over time? A. Mendeleev had not placed the elements in any particular order.

B. The atomic number of an element changes so the table is frequently rearranged.

C. The table was rearranged to show elements in order of increasing atomic number rather than increasing atomic weight.

D. Elements are removed from the table once they can no longer be found in nature.

Which of the following is a physical change? a. burning a piece of wood b. sawing a piece of wood in half c. rust forming on an iron fence d. a copper roof changing color from orange to green

Alice did an experiment to find the relationship between the angle at which a ray of light strikes a mirror and the angle at which the mirror reflects the light. she placed a ray box in front of a mirror. she changed the angle at which the light from the ray box struck the mirror and noted the corresponding angle at which the mirror reflected the light. which of the following is the dependent variable in this experiment? the mirror used to reflect the light the ray box used as the source of light angle at which the light from the ray box strikes the mirror angle at which the mirror reflects the light from the ray box

Convert a speed of 201 cm/s to units of inches per minute. also, show the unit analysis by dragging components into the unit‑factor slots.