Chem Ans Flashcards
Carbon dioxide is soluble in water and forms an acidic solution
Which ion makes the solution?
Hydrogen
Name an indicator that could be used to test if the solution is acidic and give the result of the test
Indicator: universal indicator
Result :green to red
How does the solubility of carbon dioxide change as the temperature of the water increases?
The solubility deacreases
Carbon dioxide dissolves in water to form an acidic solution
How does the ph of the solution change as the temperature of the water increases?
pH of the solution increases
CaCO3(s) + 2 HCL(aq) —> CaCl2(aq) + CO2(g) + H2O(x)
Which state symbol is x?
l (liquid)
The student investigated the volume of carbon dioxide produced when different masses of calcium carbonate react with hydrochloric acid
Describe a method the student could use
.Measure a mass of calcium carbonate
.use the weighing scales to weigh the calcium carbonate
. Put the calcium carbonate into the flask
. Measure the hydrochloric acid into the measuring cylinder
. Add the hydrochloric acid to the flask
2LiOH + H2SO4 —> Li2SO4 + 2 H2O
What type of reaction is this
Neutralisation
Calculate the relative formula mass of sulphuric ac H2SO4
H = 1 O = 16 S =32
2 x 1 + 32 + 4 x 16 = 98
Calculate the percentage by mass of oxygen in lithium sulfate (Li2SO4)
Relative atomic atomic mass of O = 16
Relative formula mass of Li2SO4 = 110
16 x 4 = 64
% of O = 64/110 x 100= 58.1% = 58% to 1sf
VALUES FOR BALANCING EQUATION QUESTION
4
2
Explain what happens to sodium atoms and to oxygen atoms when sodium reacts with oxygen to produce sodium oxygen
First sodium looses 1 electron and oxygen gains 2 electrons this makes Na + and O2-
2 observations seen during the reaction
. Yellow flame
. White powder
2 different observations if potassium is used
. Different colour flame
. Quicker burning
