Which of the following indicates that a chemical change has happened during cooking? a. butter melts. b. energy is transferred from the stove to a pan. c. bubbles form in boiling water. d. the food darkens.

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same

Which statement correctly identifies the scientific question and describes why the question is scientific? question 1 refers to the supernatural. question 2 reflects a moral or social value. question 3 refers to something that can be measured. question 4 reflects a question that can’t be observed.