What is the most obvious sign of a chemical change in this reaction.

a. a gas was produced.

b. the powder mixed with the water.

c. there was a change in temperature. eliminate

d. the powder dissolved in the water.?

Consider the group 1A elements sodium (period 3), potassium (period 4), and rubidium (period 5). What would you predict about the ionization energies of these elements? Na <K K> Rb C. Rb < Na < K D. Na = K = Rb

Summary of a trade-off between. Potential and kinetic energy

In the formation of an ionic compound, electrons are shared between atoms. a. true b. false

A water molecule consists of an oxygen atom and two hydrogen atoms covalently bonded in a bent shape. Oxygen however, attracts the shared electrons more strongly than the hydrogen atoms. This structure leads to which important property of water? a.

What is the volume of 1.5 moles of oxygen gas at standard temperature and pressure (STP) ?

Can the nature of a reactant be altered to speed up reaction

What describes the basis of the band theory of metallic bonding

Why isn't air travel based on hydrogen popular today? A. Hydrogen is very expensive B. Hydrogen is difficult to find C. Hydrogen is flammable and dangerous D. Hydrogen is too cold for travelers to stand on long trips

How to get 1m solution to 0.001m solution?

If something is in high resolution you can see and object but not very clearly. True or False.