How could you separate a mixture of rocks and sand?

What is 25mg in grams

What does the sign + mean in a chemical equation?

When a nonpolar liquid displays a convex meniscus, which of the following explains this behavior? A) It has a low surface tension, and therefore clings to the glass. B) The cohesive forces are stronger than the adhesive forces to the glass.

What is an atom? the smallest particle of matter a piece of an element the smallest molecule in the universe a combination of protons and neutrons

How many moles of oxygen are produced by decomposing 40.5 g of h2o2 (molar mass = 34.0 g/mol) according to the equation:h2o2 - - > h2o + o2 (unbalanced) ?

The first-order decomposition of n2o at 1000 k has a rate constant of 0.76 s-1. if the initial concentration of n2o is 10.9 m, what is the concentration of n2o after 9.6 s

When a catalyst lowers the activation energy of a reaction the rate of the reaction?

Liquids: A) must be contained to stay in one spot B) have a variable volume, but a fixed mass C) are usually more dense than solids and gases D) cannot be changed into gases

Given the following list from the activity series of metals (from most active to least active) K, Na, Al, Mn, Cr, Cd, Co, Pb, Hg which reaction would you NOT expect to occur? 1. Co²⁺ (aq) + Al (s) → Al³⁺ (aq) + Co (s) 2.

Chemical reactions that release energy A. will not occur. B. need catalysts to occur. C. will always explode. D. often occur spontaneously.