What are the three signs that a chemical change has taken place

Evaluate this exponential expression,8. (2 + 3)2 – 42

Why did southern business leaders want to increase the number of slaves

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.