Which of the following is a physical change?

explosion

rotting of food

evaporation

rusting of iron

How to remember first 20 elements of the periodic table

What relationship does Charles law describe?

Check all that apply to sugar. does not conduct electricity is an electrolyte forms ions in water is a nonelectrolyte

In which list are the elements arranged in order of increasing atomic mass? A) CI, K, Ar B) Fe, Co, Ni C) Te, I, Xe D) NE, F, Na

Which substance is a primary source of hydrocarbons? A. cotton B. metals C. petroleum D. soil

Which earth cycle does the suns energy drive

How many moles are in 10 grams of CaCl2?

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