Describe the characteristics that identify a sample of

matter as a substance.

The isotope of hydrogen that has two neutrons is called A. hydrogen. B. deuterium. C. tritium. D. dihydrogen.

Determine the pH of a 0.28 M solution of pyridinium nitrate (C5H5NHNO3) at 25°C. [Pyridinium nitrate dissociates in water to give pyridinium ions (C5H5NH+), the conjugate acid of pyridine (Kb = 1.7 * 10-9), and nitrate ions (NO3-).]

How many times bigger is the earth than a nucleus?

Which of the following is a property of a base? A taste sour (B slippery feel (c produces hydrogen gas when reacting with a metal D produces carbon dioxide when reacting with carbonates

How many moles of sodium iodide are needed to remove 5.95*10-6 mol of o3?

Using the kinetic theory what happens to oxygen particles as they are cooled

Identify the following: 1. The only 2 liquid elements. 2. The element in period 4, group 0. 3. The second metalloid in period 4. 4. The first element in group 4A.

You are about to open a container of soy milk but notice that there are instructions to "shake well before serving." the soy milk is most likely a

Give reason: a. Fractionating columns with beads are used for fractional distillation b. Crystallisation is a better technique than evaporation

How can a gardener remedy soil that is overly acidic?