Which of the following processes are physical changes?

a) drying wet clothes

b) lighting a match from a matchbook

c) cutting snowflakes out of paper

d) melting butter for popcorn

What type of reaction is this? Choose all correct answers. a) Acid-Base Reaction b) Precipitation Reaction c) Oxidation-Reduction Reaction d) Double Replacement Reaction

3.80 moles of oxygen are used up in the reaction. How many moles of water are produced?5. How many grams of oxygen does it take to produce 9.60 moles of carbon dioxide?6. How many moles of carbon dioxide are produced with using 5.

If an atom has 17 electrons and its mass number is 35, calculate the following: - number of protons - number of neutrons - atomic number

Explain the difference between atomic numbers and atomic mass

If a leaf is fossilized, it would most likely form what type of fossil? A. Petrified fossil B. Imprint fossil C. Trace fossil D. Amber fossil

Balloon A started with a volume of 1.76 L. The temperature of the room the balloon was in was 295 K. The balloon was heated to a temperature of 253.15 K. What is the new volume?

The standard internal energy change for a reaction can be symbolized as ΔU°rxn or ΔE°rxn. For the following reaction equations, calculate the energy change of the reaction at 25 °C and 1.00 bar. Sn (s) + Cl2 (g) - - - > SnCl4 (l) + H (KJmol) - 511.3.

You transfer a sample of a gas at 17°C from a volume of 5.67 L and 1.10 atm to a container at 37°C that has a pressure of 1.10 atm. What is the new volume of the gas?

What is true about the energy involved in a chemical reaction? A. The amount of energy is constant, but it is converted from one form to another. B. The amount of energy decreases as it is converted from one form to another. C.

Which state of matter is highly compressible, is made of particles moving independently of each other, and is present in large quantities near Earth's surface?