Define a physical change

Consider the elements of group 4a (the "carbon family") : c, si, ge, sn, and pb. what is the trend in metallic character as one goes down this group?

The magnitude of a force is

A sample of oxygen gas occupies a volume of 250. mL at a pressure of 740. torr. What volume will the gas occupy at a pressure of 800. torr if temperature is held constant?

What is the molarity of a saline solution that contains 0.900 g NaCl (58.44 g/mol) dissolved in 100.0 mL of solution?

10. Elements listed in order of increasing electronegativity are A) oxygen, nitrogen, fluorine. B) fluorine, nitrogen, oxygen. C) fluorine, oxygen, nitrogen. D) nitrogen, oxygen, fluorine. E) nitrogen, fluorine, oxygen.

Which of these is a covalent compound? 1. AICI3 2. CO 3. MgO 4. LiCI

What is a protein used for

Atoms of the halogen family typically steal two electrons from other atoms when they react true or false

Looking at the periodic table, which group consists of elements that will not form an acid when combine with hydrogen? A) radon, neon, calcium B) neon, bromine, barium C) beryllium, iodine, krypton D) lithium, potassium, fluorine

Mixtures have (exact, relative) amounts of the same substances