Apiece of metal with a length of 1.42 cm was measured using four different instruments. which of the following measurements is the most accurate?
1.433 cm
1.429 cm
1.415 cm
1.404 cm

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

How does the presence of oxygen affect the chemical pathways used to extract energy from glucose?