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

A soil sample has 20% slit, 10% clay, and 70% sand. What kind of soil is it?

In which sample of water do the water particles have more energy : 5grams of ice cubes at - 10 C, or 5 g of liquid water at 20 C? How do you know?

How do you find the overall redox reaction

A bowling ball on earth weighs 11 pounds and has a mass of 5 kg the gravitational force on the moon is 1/6 of the gravitational force on earth what would the mass of the bumblebee on the moon 0.83kg 1.8lbs 5kg 11lbs

What characterizes a strong acid or base

A rigid cylinder with a movable piston contains a 2.0-liter sample of neon gas at STP. What is the volume of this sample when it's temperature is increased to 30 degrees Celsius while its pressure is decreased to 90 kilopascal

Write a speech aimed at year 7 to explain why some metals lose their shine over time but gold does not.

How many moles of co2 could fit in a 475 ml bag at - 22c and 1.125 atm?

How mant atoms are in 3N2

The type of nuclear decay an unstable nucleus will undergo depends on its ratio of neutrons to protons. The radioisotope cobalt-65 has a ratio of neutrons to protons of 1.41, which is too high for a nucleus of this size.