Which of the following is a physical change?

A) burning a piece of paper

B) lighting a match

C) chopping a piece of wood

D) a rusting nail

The size of a minerals crystals depends on what?

Which of these describes the flow of energy as rock salt is dissolved in water? Choose the correct answer. A) Energy is absorbed by the reaction, and the temperature of the surroundings decreases.

Which of the following when dissolved in deionized water would make a good conducting solution? a) methanolb) sugarc) baking soda

What is the number of valence electrons in each of the main groups on the periodic table?

A standard drink of beer is _ ounces.

What are the pros of using steel?

Cation a has a + 3 charge and is small. cation b has a + 1 charge and is large. which is more likely to occupy negatively charged sites on a clay mineral given equal concentrations in solution? cation a cation b they are the same

Show your work, including units, for the following series of calculations: a. How many moles of Al are in 1.25 g of Al? b.

An aqueous solution at 25 °C has a pOH of 12.42. Calculate the pH. Round your answer to 2 decimal places

A student records the mass of a piece of iron. The iron is then left outside until it rusts. What type of reaction occurs, and how does the mass of the object after rusting compare with its original mass?