Jeopardy Lessons 16-18

Mole

100

What is the mole?

The SI unit for amount of substance.

200

For what is the percentage composition used?

Used to know the percentage by mass of a particular element in a chemical compound.

300

What is the percentage composition of carbon and oxygen in a carbon- oxygen compound, given that 95.2 g sample of the compound contains 40.8 g of carbon?

95.2g sample = 40.8 g carbon (40.8g/95.2g)*100= 42.9% carbon, 57.1%oxygen

400

What is Avogado´s number?

The number of particles in a mole, named by Amede Avogadro.

500

Calculate the percentage composition of phosphorus in P4O10

P=4 O=10 4( 30.97) = 123.9 10(16.00)=160+123.9=283.9 P=123.9/283.9 *100 = 43.6 % O=1607283.9*100=56.4%

Chemical Reactions

100

What are chemical reactions?

The process by which one or more substances change to produce one or more different substances.

200

What is the law of conservation of matter?

States that matter can´t be created nor destroyed in any ordinary chemical reaction.

300

NaCl+AgNO3→ NaNO3+AgCl is which type of reaction?

Double displacement.

400

Predict the products for the following reactions and balance the equation. C(s)+ O2 (g)-→???

CO2(g)

500

Predict if the following reaction will occur, if it doesn´t write NR (no reaction). Au (s) + NiSO4 (aq) → ???

NR

Stoichiometry

100

What is composition stoichiometry?

Mass relationship of elements in compounds . involving the mass relationship between reactions and products.

200

Pb + 2 HCL ---- Pb + Cl2 +H2 find moles of HCl if you have 0.36 mol of Pb

.36 moles Pb * 2 moles HCl / 1 mol Pb = .72 moles of HCl

300

2Al2O3(I)--- 4 Al (s)+ 302(g), you have 13.0 mol of Al2O3

13.0 mol Al2O3* 4 mol Al/2 mol Al2O3= 26.0 mol Al

400

O2+2h2----2h2O

O2= 1.22g H2= 1.05G 1.22g O2 * 1mol H2/ 32gO2 *2 mol H2O/1 mol O2= 0.076 mol H2O 1.05G H2 * 1 mol H2/2.02gH2 * 2 mol H2O/2 mol H2=0.519mol H2O

500

2Na+ O2 ----Na2O2

Na=3.74 O2=5.34 % yield of NaO2 (actual yield) *5.34g 3.74g Na*1 mol Na/22.99gNa*1 mol Na2O2/2 mol Na* 77.98g NaO2 /1 mol Na2O2= 6.343gNaO2 5.34/6.343*100= 84.2%

Life connection

100

When you want to measure the dosis of medicine you should take, you use?

Limiting reactant

200

The H in H2O stands for which element of the periodic table?

Hydrogen

300

Who discovered plutonium?

Glenn Seaborg

400

The 19th element of the periodic table is commonly found in bananas.

Potassium

500

This type of bond doesn´t share its electrons equally and its also the name of a bear that lives in the Artic.

Polar bond