A cube of salt is crushed before being stirred into water.

Physical Change? Chemical Change? Both?

In a voltaic cell based on the Cu-Zn reaction Zn (s) + Cu2 + (aq) - -> Cu (s) + Zn2 + (aq) there is exactly 1 mole of each reactant and product.

How many moles of Na2CO3 are in 100.0ml of a 2.0M solution?

What element has three electrons in its 5d sublevel? Select one: a. Nd b. Nb c. Ta d. U

Why is burning propane gas a chemical reaction? a) The atoms in propane and oxygen rearrange to form other substances after the reaction. b) The atoms that make up propane and oxygen change into different atoms after the reaction.

How many moles of h2o will be produced from 2.9 g of HCl reacting with Ca (OH) 2?

Prevailing winds peru

Foods labeled "fat free" can actually contain less than 0.5 grams of fat.

Plants make their own food. The chemical reaction for this process is shown in the equation below. CO2 + H2O + energy → C6H1206 + O2 What are the products in this chemical reaction? O A. C6H1206 + energy O B. H20 + energy O C. CoH1206+02 O D.

Using ohm's law, explain how voltage changes in relation to current, assuming that resistance remains constant.

An average copper penny minted in the 1960s contained about 3.000 g of copper. how much chalcopyrite had be mined to produce 100 pennies?