A pure substance that cannot be broken into simpler substances by physical or chemical means

Examine the equation. 23490Th→23088Ra+42He What kind of barrier would you need to block the radioactive particles from this reaction? a sheet of aluminum foil a solid concrete block a two-inch block of lead a piece of paper

A student dissolves 12. g of sucrose C12H22O11 in 300. mL of a solvent with a density of 1.01/gmL. The student notices that the volume of the solvent does not change when the sucrose dissolves in it.

Zinc + lead (II) nitrate yield zinc nitrate + lead what's the chemical equation for this?

What is the definition of thermal expansion

Polar solvents dissolve solutes and nonpolar solvents solutes. nonpolar polar Non-polar/polar Polar/non-polar

What fuel is produced by the electrolysis of water? chlorine gas hydrogen gas natural gas oxygen gas

Model describe how you would show j. j. thomson's model of the atom using small beads and clay

Switching one substance for another is called ... ? a) displacement b) synthesis c) decomposition d) oxidation

C2h4 + O2 - CO2 + H2O If we start with 20 grams of CH4, how many moles of CO2 will form?

How does chemical energy relate to the atom and how can we use it?