Which sample is a pure substance?

a test tube of zinc oxide

a container of zinc and oxygen

a flask of pond water

a jar of soil

Solid potassium chromate is slowly added to 175 mL of a lead (II) nitrate solution until the concentration of chromate ion is 0.0366 M. The maximum amount of lead ion remaining in solution is

What's the formula for Lead (II) chlorite?

What must happen for fluorine to become stable

This balanced chemical equation represents a chemical reaction: 6no + 4nh3 → 5n2 + 6h2o what volume of nh3 gas, at standard temperature and pressure (stp), is required to react with 15.0 g of no?

Sodium hydroxide dissolves in water according to the equation below. if the original temperature of the solution is 50°c, which might be the temperature after a period of time? naoh (s) → naoh (aq) δh = - 445.1 kj. mol

Was the rock pulled apart, pushed together, or did it slide past another rock to make this formation what type of fault is this

What is Chronatography

Which of these describes an endothermic reaction? -Energy is absorbed by the reaction. -Energy is released by the reaction. -Energy is created in the reaction. -No energy is transferred by the reaction. What is the answer?

Oxygen and copper are examples of what? Two substances with identical atoms. Two different molecules. Two different elements. Atoms that can't combine to form compounds.

In this group, which percentage does the green seed represent? 25% 50% 75% 100%