Which of the following observations likely describes a physical change?

Formic acid (HCO2H) has a dissociation constant of 1.8 _ 104 M. The acid dissociates 1:1. What is the [H+] if 0.1 mole of formic acid is dissolved in 1.0 liter of water? Use a scientific calculator. 0.9 _ 10^-3 M 4.2 _ 10^-3 M 7.

Explain organic chemistry

If oxygen is removed from a sample of air as iron rust, what happens to the particle pressure of oxygen in the air?

Which of the following is not an atom A. Nitrogen B. copper C. Carbon dioxide D. Aluminum

A compound has an empirical formula of C2H5. What is true about this empirical formula? A. It models the structure of the compound. B. It shows the ratio of elements in the compound. C. It gives the mass of each atom in the compound. D.

What is the best name for the molecule below? a compound with 10 total carbons with a double bond and the rest single bonds.

What Word means the gradual change and build up of organisms in an enviroment

If you see the Sun is high in the sky, what can you say about the SUN as viewed from the opposite side of Earth at the same moment?

What element has 8 valence electrons

Which of the following best describes a metal? Brittle, shiny, and solid Brittle, dull, and low density Malleable, shiny, and able to conduct heat or electricity Malleable, dull, and solid, liquid, or gas at room temperature?