Which of the following is an example of a physical change in matter?

a. fizzing produced when magnesium metal is added to acid

b. bending of sodium metal

c. sodium metal exploding in water

d. magnesium metal burning with a bright white flame

Which of the following presented the first alteration of natural resources? A) industry B) agriculture C) building waterways D) hunting and gathering

How many grams of water (H2O) are produced if I burn 4 moles of octane (C8H18) in excess oxygen? 2C8H18 + 25O2  16CO2 + 18H2O

A gas at 255 kilopascals and 45°C has an initial volume of 2.00L. The pressure of the gas increases to 805 kilopascals as the temperature is raised to 255°C. What will be the new volume? 1.05 liters 2.28 liters 1.25 liters 0.44 liters 1.50 liters

How many atoms are in 12 grams of NaOH

Which is the electron configuration for lithium? 1s2 2s3

The mixing of which pair of reactants will result in a precipitation reaction? the mixing of which pair of reactants will result in a precipitation reaction?

A balloon has 18.9 moles of hydrogen gas at a volume of 428 L. What would the volume of the gas be if the balloon had 14.0 moles of hydrogen gas left after 1 day?

An analytical chemist is titrating 242.5 mL of a 1.200 M solution of hydrazoic acid HN3 with a 0.3400 M solution of NaOH. The pKa of hydrazoic acid is 4.72. Calculate the pH of the acid solution after the chemist has added 1006.

A gas stream contains 18.0 mol% hexane and the remainder nitrogen. the stream flows to a condenser, where its temperature is reduced and some of the hexane is liquefied. the hexane mole fraction in the gas stream leaving the condenser is 0.0500.

What type of solution is aerated water. why is it so.