Definition of an ion, understanding atoms, understanding charge

An ion is (a) an atom that is electrically charged (b) an atom that has gained an electron (c) an atom that has lost an electron (d) all of the above (e) none of the above

Understanding covalent bonds, electrons, atoms, molecules

In forming a covalent bond, electrons are (a) shared by two atoms (b) given up by an atom (c) taken up by an atom (d) none of the above (e) all of the above

Determining how many moles are used?

In the laboratory you are instructed to add 2 drops of 0.15 M AlCl3 ( 3 is suppose to be subscript) to 2 drops of 0.15 M NaOH. If twenty drops makes one milliliter, determine how many moles of AlCl3 (subscript 3) are used. How many moles of NaOH are used?

Balanced Reaction

Show the complete, balanced reaction when 2.35 grams of Ti(OH)4 ( 4 needs to be subscript) reacts with excess sulfuric acid.

What is the limiting reagent?

In the lab you measure 0.65 g of aluminum foil and place it in a beaker under the hood. Very carefully you measure 2.0 mL of Br2 ( 2 needs to be subscript) (density 2.928 g/mL), aslo under the hood, and pour it into the beaker with the aluminum foil. A really cool reaction occurs. What is the limiting reagent? Show ALL necessary ...continues

Balance Reaction

In the lab you add excess hydrochloric acid (HCl) to 2.65 g of Na2CO3. Complete and balance the reaction, and identify the state of each substance.

Molar Masses

Complete each reaction. In(OH)3 (s) + HF (aq) ----> BaCO3 (s) + HNO3 (aq) ----> NH3 (aq) + H3PO4 (aq) ----> Nb(OH)2 (s) + HBr (aq) ---->

Concentration

What is the concentration of 25.0 mL of HCl if it is completely neutralized by 47.4 mL of 0.250 M NaOH?

Reactions

Balanced Reaction: Ti(OH)4 + 2H2SO4 ---> Ti(SO4)2 + 4 H20 Name each reactant,and product. What type of reaction is this? What is the limiting reagent? How many grams of water can be produced from this reaction? Show the calcuation of the molar masses of the necessary substances before showing the calculation for theoretic ...continues

when mult or dividing equation using squares or cubic measures what do you do with cm2 ?

2.0 x 10-3cm x 0.2cm2 (10 is to the -3power) or 2.00 x 10-3cm divided by 0.020cm2