Define a catalyst. [2 marks]

A student conducted an experiment and combined sodium chloride with magnesium hydroxide to produce sodium hydroxide and magnesium chloride. The student collected the 120 grams of NaOH.

Oxidation number of Cr (OH) 3?

What is the beta decay of uranium-237

Sewing quilts is an American tradition that dates from the pioneer days. Quilts are usually made with 100% cotton fabric.

A dehydration reaction releases a. hydrogen. c. hydroxide ions. b. water. d. carbon dioxide.

Find the number of moles of water that can be formed if you have 134 mol of hydrogen gas and 62 mol of oxygen gas

The amount of kinetic energy an object has depends on its. motion position gravity height

What is the empirical formula of Fe?

Small beads of iridium-192 are sealed in a plastic tube and inserted through a needle into breast tumors. If an Ir-192 sample has an initial activity of 560 dpm, how much time is required for the activity to drop to 35 dpm (t1/2 = 74 days) ?

Consider the following equation. 2H2 (g) + O2 (g) 2H2O (g); ΔH is negative. Which statement is true? The reaction is endothermic from left to right. Increased pressure would increase the rate of forming water vapor.