Describe the characteristics that identify a sample of

matter as a substance.

8.000 moles of Cl2 (g) react with excess P4 (s) to produce 0.5741 mol of phosphorus trichloride. What is the percent yield for this reaction? P4 (s) + 6 Cl2 (g) → 4 PCl3 (l)

Solid ZnCl2 and liquid ZnCl2 have different (1) empirical formulas (3) ion ratios (2) formula masses (4) physical properties

Which two elements have similar characteristics? indium, lithium, francium, niobium

Which of the following is an example of a mechanical wave? O A. A light ray B. A seismic wave C. A radio wave D. An X-ray

A diamond contains 5. 1021 atoms of carbon. What amount (moles) of carbon are in this diamond?

35mL of acid with an unknown concentration is titrated to completion using 63mL of 3.0 MNaOH. What is the concentration of the acid?

What is the number of lone electron pairs on the central atom of a molecule having a linear molecular geometry, such as clf2-?

Look carefully at Kw expression. If the [H+] changed from [1 x 10-7] to [1 x 10-4], the [OH-] will: A. remain the same B. increase C. decrease

What on a bird, besides it's feet, is chemically similar to scales? A. beak B. feathers C. wings

What are the carbon (C) and oxygen (O) in carbon dioxide (CO2) ? (select all that apply) A) Atoms B) Compounds C) Elements D) Molecules