Calculation
In an experiment, 30.0 g of glucose was fermented. Calculate the number of moles of glucose in 30.0 g. Given that the Mr of glucose is 180g/mol.
0.167
Which statement is not correct?
A.) When a base reacts with an ammonium salt, ammonia is given off.
B.) When an acid reacts with a base, neutralisation takes place.
C.) When an acid reacts with a carbonate, carbon dioxide is given off.
D.) When the acidity of a solution increases, the pH increases.
D.) When the acidity of a solution increases, the pH increases.
Photosynthesis is another example of a photochemical reaction. Green plants can make simple carbohydrates, such as glucose. These can polymerise to make more complex carbohydrates, such as starch.
Write a word equation for photosynthesis.
carbon dioxide + water → glucose + oxygen
What team will win in the UCL Finals?
A.) AC Milan
B.) Manchester United
C.) Borussia Dortmund
D.) Manchester City
E.) Real Madrid
C.) Borussia Dortmund
What is the relative molecular mass, Mr, of nitrogen dioxide?
A.) 15
B.) 23
C.) 30
D.) 46
D.) 46
Explain the term amphoteric.
Able to react both as a base and as an acid
Give the name of an element from Period 3 (sodium to argon), which matches the description.
An element that is added to water to kill bacteria.
Chlorine
Who was the first person to be eliminated from the following?
A.) My great grandfather
B.) Osama bin Laden
C.) Rosa Parks
D.) John Fitzgerald Kennedy
E.) Billy the Kid
E.) in 1881
A compound X contains carbon, hydrogen, and oxygen only. X contains 54.54% of carbon by mass, 9.09% of hydrogen by mass, and 36.37% of oxygen by mass. Calculate the empirical formula of compound X.
C2H4O
lithium oxide + sulphuric acid lithium sulphate +water
Change into a symbol equation.
Li2O + H2SO4 --> Li2SO4 + H2O
The student then adds sodium hydroxide solution to the copper(II) sulfate solution to produce copper(II) hydroxide. Describe what the student would observe and write an ionic equation for this reaction.
Blue precipitate, Cu2+ + 2OH → Cu(OH)2
Who delivered the public speech "I Have a Dream" in 1963?
Martin Luther King Jr.
In an experiment, 25cm3 of aqueous sodium hydroxide, 0.4mol/dm3, was neutralised by 20cm3 of aqueous oxalic acid H2C2O4.
2NaOH + H2C2O4 → Na2C2O4 +2H2O
Calculate the number of moles of NaOH in 25cm3 of 0.4mol/dm3 solution.
0.01
Dilute sulfuric acid is a typical acid. A student adds excess dilute sulfuric acid to a sample of solid copper(II) carbonate in a test-tube.
Give three observations the student would make.
1.) bubbles / effervescence/ fizzing
2.) dissolves /disappears / forms a solution
3.) blue (solution)
The reaction between magnesium and carbon dioxide is represented by the following equation.
2Mg + CO2 → 2MgO + C
Which statement describes what happens in this reaction?
A.) Carbon is oxidised.
B.) Magnesium is reduced.
C.) The carbon in carbon dioxide is reduced.
D.) Neither oxidation nor reduction happens.
C.) The carbon in carbon dioxide is reduced.
What did Abraham Lincoln do in 1863?
He freed the slaves.
d) Calculate the overall energy change for the reaction between iodine and chlorine using the bond energy values shown. I2 + Cl2 → 2ICl
Bond Energy/kJ per mol
I-I 151
Cl-Cl 242
I-Cl 208
-23
An alloy contains copper and zinc. Some of the zinc has become oxidised to zinc oxide. What is the result of adding an excess of dilute sulfuric acid to the alloy?
A.) The alloy dissolves completely to give a blue solution.
B.) A blue solution and a white solid remains.
C.) The alloy dissolves completely to give a colourless solution.
D.) A colourless solution and a pink /brown solid remains.
D.) A colourless solution and a pink /brown solid remains.
Based on the reactivity series of metals chart, name the most 3 reactive metals.
Potassium, sodium, lithium.
What does the Australian slang "bogan" mean?
A person whose speech, clothing, attitude and behaviour are unrefined or unsophisticated.