Chemistry Ka1 Flashcards
What are the reactants from this equation? :
Citric acid + sodium carbonate –> sodium citrate + water + carbon dioxide
Citric acid + sodium carbonate
What are the products from this equation? :
S + O2 –> SO2
SO2
Balance this equation :
CH4 + O2 –> CO2 + H2O
CH4 + (2)O2 –> CO2 + (2)H2O
What does the Mr mean?
Relative formula mass
What is the Mr of NH3
1x14 + 1x3 = 17
What is the Mr of : Ba(OH)2
1x137 + 17x2 = 171
What is the Mr of Ca(NO3)2
40x1 + 2 (14+(3x6)) = 164
Sodium hydrogencarbonate –> carbon dioxide + water + ???
Sodium carbonate
What does thermal decomposition mean?
Using heat to break something down
What is oxidation?
When something reacts or joins with oxygen
What is uncertainty?
Some doubt with a measurement
The volume of a gas produced in a reaction was measured 5 times. The results are 82, 77, 78, 96 and 80cm3. Find the mean value and it’s uncertainty
Anomalous = 96
Mean volume= (82+77+78+80) /4 = 79
Highest value= 82 (three values bigger than 79
Lowest value= 77 (2 values lower than 79
Uncertainty = +_ 3cm3
= 79 +_ 3cm^3
If the Mr of CaCO3 = 100, then how many moles are there?
100g
How do u work the Mr, no. Moles and mass of a substance
Mass of substance = no.moles x Mr
If the mass of 2Mg + O2 and 2MgO is 80g then what does this state
The law of conservation of mass states the mass of reactants = mass of products
Find the mass of ammonia when 7g of nitrogen reacts with hydrogen gas : N2+3H2 –> 2NH3
N2 + 3H2 —> 2 NH3
Q. 7g(k) ?mass
M. 1 2
Mr. 28 17
M. 1x28=28 17x2 = 34
R. 28/28= 1 34/28= 1.2142857
A. 1x7 = 7 1.2142857 x 7 = 8.5g
Find the mass of zinc needed to react with oxygen to make 8.1g of zinc oxide : 2Zn + O2 –> ZNnO
6.5g
