2. What is the name of the

system of measurement used by

the United States?

Which of the following summertime activities consists solely of physical change? a. making a sandcastle out of water and sand b. letting the sun turn your skin a toasty brown c. eating and digesting a sandwich at a picnic d.

Which of these is a molecule? a. Ca c. Na b. Mg d. H2O

Given the balanced equation representing a reaction: CH4 (g) + 2O2 (g) - - > 2H2O (g) + CO2 (g) + heat Which statement is true about energy in this reaction? (1) The reaction is exothermic because it releases heat.

What is "plastic" rock and how does it move?

What is the chemical equation for nicotine?

Gas y effuses half as fast as o2. what is the molar mass of gas y?

A sample of gas has a mass of 0.555g. volume is 117 mL at a temperature of 85 degrees Celsius and a pressure of 0.99 atm. What is the molar mass of the gas?

What is the molar mass of potassium

A chemist determined by measurements that 0.050 moles of aluminum participated in a chemical reaction. Calculate the mass of aluminum that participated in the chemical reaction. Be sure your answer has the correct number of significant digits.

In 1901, Thomas Edison invented the nickel-iron battery. The following reaction takes place in the battery. Fe (s) + 2 NiO (OH) (s) + 2 H2O (l) Fe (OH) 2 (s) + 2 Ni (OH) 2 (aq) How many mole of Fe (OH) 2, is produced when 5.35 mol Fe and 7.