Sharping a pencil leaves behind pencil shavings. Is sharpening pencil a physical or chemical change

The p K a of acetic acid is 4.76, and the p K a of trichloroacetic acid, which is used to remove warts, is 0.7. Calculate the dissociation constant of each acid. Which is the stronger acid?

The nervous system consists of the brain, spinal cord, and nerves that run throughout the entire body. Which of these is one function of the nervous system?

Describe the color seen in each test tube in terms of amount of starch present. explain why the difference exist

The surface temperature on Venus may approach 757 K. What is this temperature in degrees Celsius? 757 K = The temperature on Mercury may drop to - 261 °F at night. What is this temperature in degrees Celsius? - 261 °F =

7. What is the difference between a measured value and an accepted value? How are these values used to determine the precision of your answer?

How many moles of lithium are in 83 grams of lithium?

Ocean constitutes most of ___ of water a) Evaporation b) Precipitation c) Condensation d) Transpiration e) Sublimation Don't choose a random letter.

In the reaction, Zn + HCl-> ZnCl2 + H2, 25 grams Zn are reacted with 17.5 grams HCl. How many grams of H2 will be produced? A. 0.382 g of H2 B. 0.479 g of H2 C. 0.7865 g of H2 D. 0.484 g of H2

Is nail varnish soluble?

What is the periodic trend for atomic size from top and bottom in a group? From left to right in a period?