Aplant uses carbon dioxide and water to form food and oxygen. why is this a chemical change? the mass of the plant increases greatly. the properties of water and food are same. the plant increases in height as food is produced. the properties of carbon dioxide and oxygen are different.

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