Moles and mass
What is the Avogadro’s Number?
6.02 x1023
CO+Fe2O2=Fe+CO2
3C0+Fe2O3=2Fe+3CO2
Which matter will turn the blue litmus paper red?
acids
List 4 types of chemical reaction?
Synthesis reaction, Decomposition reaction, Single replacement reaction, Double replacement reaction.
How many moles of oxygen atoms are there in 3.2g of Oxygen?
3.2g/16gmol=0.2 moles
Al+Cl=AlCl
Al+Cl=AlCl2
Which matter will make bromothymol blue turns yellow?
acids
NH3+HCl → NH4Cl
Synthesis reaction
How many Aluminum atoms in 113.5 moles of Aluminum?
113.5 x 6.02 x 1023=6.8327x1025
H2SO4+NaOH=NaSO4+H2O
H2SO4+NaOH=2NaSO4+2H2O
Which side on the ph scale shows the bases?
right
3C0+Fe2O3=2Fe+3CO2
Double Displacement Reactions
How many moles in 30g of MgCl2 ?
24+35*2=94g
HCl+Mg=MgCl2+H2
2HCl+Mg=MgCl2+H2
What colour is water on the ph scale？
green
2HCl2+Mg=MgCl2+H2
Single displacement
When 12 g of carbon is burned in air, 44 g of carbon dioxide is produced. What mass of carbon is needed to produce 11 g of carbon dioxide?
11 × (12 ÷ 44 g) = 3 g of carbon.
CH4+O2=CO2+H2O
CH4+2O2=CO2+2H2O
What’s the ph of coca-cola？
Around 3
H2CO3= H2O + CO2
Decomposition reaction