Name 3 some sources of CO2

What is the mass of a sample of copper that contains 4.78 x 1023 atoms?

One of the homework questions. I got the answer 2.48898 x 10 - 3 from my calculator. Would I put 2.49 x 10 - 3 as my answer ... is this correct? If a 120-lb woman uses five 2.

Order 10mm, 10km, 10m 10nm, 10cm from smallest to largest.

Given that the density of TlCl (s) is 7.00 g/cm3 and that the length of an edge of a unit cell is 385 pm, determine how many formula units of TlCl there are in a unit cell.

What is true of valence electrons? a) They exist in the outer orbital. b) they easily move from one orbital to another c) they have difficulty moving from one orbital to another d) they are always the lowest energy electrons of the atom

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.

Which metal exist in liquid state and can be cut with knife?