Which of the following provides evidence that a chemical change has taken place?

What is the best description of weathering? building up earth's surface through deposition processes that make it difficult to determine the age of rocks breakdown of rocks through mechanical or chemical processes when rock layers form horizontally

Which of the following acids should be used to prepare a buffer with a pH of 4.5? A. HOC6H4OCOOH, Ka = 1.0 x 10^-3B. C6H4 (COOH) 2, Ka = 2.9 x 10^-4C. CH3COOH, Ka = 1.8 x 10^-5D. C5H5COOH, Ka = 4.0 x 10^-6E. HBrO, Ka = 2.3 x 10^-9

Which component of a galaxy has other objects that revolve around it? (A) Dust (B) Star (C) Gas (D) Universe

If 445 ml of 6.0 M HNO3 is diluted to 2.5 L, what is the molarity of the diluted solution?

Which hypothesis led to discovery of the proton?

How to solve determine the final temperature when 450.2 grams of aluminum at 95.2°c is placed in an insulated calorimeter with 60.0 grams of water at 10.0°c?

Which of the following is true about a scientific hypothesis? A. The hypothesis must form a scientific theory. B. The hypothesis must be testable. C. The hypothesis must predict the outcome of the experiment. D.

Convert 1.76 um to inches

Why is lewis electron-dot diagrams more suitable than electron-shell diagrams illustrating chemical bonds

What mass of sodium benzoate should be added to 150.0 ml of a 0.15 m benzoic acid solution in order to obtain a buffer with a ph of 4.25? (assume no volume change.) ?