Which of the following will result in a chemical change?

A. Drying wood in a shed

B. Melting ice to obtain water

C. Burning coal in a furnace

D. Evaporating alcohol into vapor

In an experiment, an unknown gas effuses at one-half the speed of oxygen gas, which has a molar mass of 32 g/mol. which might be the unknown gas?

Write a net ionic equation to show that nitrous acid behaves as a brønsted-lowry acid in water.

Which statement describes compounds? Compounds are made of one type of atom. Compounds cannot be represented by models. Compounds are represented by chemical formulas. Compounds cannot be broken down into simpler forms.

A geological sample is found to have a Pb-206/U-238 mass ratio of 0.337/1.00. Assuming there was no Pb-206 present when the sample was formed, how old is it? The half-life of U-238 is 4.5 * 109 years. 1.4 * 1010 years2.1 * 109 years7.3 * 1011 years7.

What are translation metals

Explain the iodine clock reaction.

1 75 ml of lemon juice are added to 50 ml of water. What is the percent by vo of the solute?

How many moles of tungsten atoms are in 4.8 x 1025 atoms of tungsten?

At what speeds do you criuse down the track of a roller coaster

A sample of hydrogen gas is mixed with water vapor. The mixture has a total pressure of 755 torr and the water vapor has a partial pressure of 24 torr. What amount (in moles) of hydrogen gas is contained in 1.55 L of this mixture at 298 K?