All of the following are signs that a chemical reaction may have taken place in a piece of glass except. a. the shape of the glass changes. b. energy is used or given off. c. new substance besides glass are formed. d. the glass changes color.

How many moles of oxygen are in 3.7 moles of C8H11NO2?

HI decomposes to H2 and I2 by the following equation: 2HI (g) → H2 (g) + I2 (g); Kc = 1.6 * 10-3 at 25∘C If 1.

True or false: The elements in a group of the periodic table have similar characteristics

The atmospheres of the jovian planets are made of primarily: a. liquid metallic hydrogen b. methane and ammonia c. oxygen and nitrogen d. hydrogen and helium

Describe the type and nature of the bonding that often occurs between two nonmetals

Which is the correct formula for phosphorus pentachloride? PCl4 because a subscript of 4 indicates four Cl atoms PCl5 because a subscript of 5 indicates five Cl atoms P5Cl because a subscript of 5 indicates five P atoms P5Cl3 because a subscript of

Why are the elements in groups 3 to 12 often used to make dyes?

What is not needed for corrosion of metals? a. oxygen c. water b. ions d. sunlight

What force can move the oceans

How many moles of NO3 are there in 6.2g