Part I. (8 points) Multiple choice questions

Question 1: If the matter is uniform throughout, cannot be separated into other substances by physical processes, but can be decomposed into other substances by chemical processes, it is called a (an) ________.
A. heterogeneous mixture
B. mixture of elements
C. homogeneous mixture
D. compound

Question 2: Which of the following image(s) shows a high precision?

A. (1) and (2)
B. (2) and (3)
C. (3) and (4)
D. (4) and (1)

Question 3: What is the scientific notation of 1234?
A. 1.234 × 10³
B. 1.234 × 10^-3
C. 12.34 × 10²
D. 12.34 × 10^-2

Question 4: Which of the following numbers has three (03) significant numbers?
A. 151.0
B. 0.00150
C. 0.15
D. 0.015

Part II. (2 points) Long answer question
Question 5: What is the correct result (indicating the proper number of significant figures) of the following addition: (12 + 1.2 + 0.12 + 0.012)? Explain the result.