Question
A list of substances is shown.
aluminium oxide carbon dioxide chlorine diamond ethanol
glucose iron(III) oxide limestone nitrogen oxygen
Answer the questions using the list of substances.
Each substance may be used once, more than once or not at all.
State which of the substances:
(a) is a reactant in photosynthesis [1]
(b) is the main constituent of bauxite [1]
(c) are two products of fermentation __________ and __________ [2]
(d) is used as a fuel[1]
(e) is a gas used to convert iron into steel[1]
(f) is a greenhouse gas[1]
(g) is a gas that is approximately 78% of clean, dry air1]
(h) is a form of carbon[1] [Total: 9]
Answer/Explanation
Ans:
1(a) carbon dioxide
1(b) aluminium oxide
1(c) ethanol (1)
carbon dioxide (1)
1(d) ethanol
1(e) oxygen
1(f) carbon dioxide
1(g) nitrogen
1(h) diamond
Question
The elements shown are gases at room temperature and pressure.
hydrogen
nitrogen
oxygen
chlorine
(a) State which one of these gases is green.
(b) The gases shown exist as diatomic molecules.
State the name of another element which has diatomic molecules and is a gas at room
temperature and pressure.
(c) When separate samples of each of these gases are placed in a container they will diffuse.
(i) Describe why these gases diffuse.
(ii) State which of these four gases has the highest rate of diffusion.
Explain your answer.
gas ……………………………………………………………………………………………………………………..
explanation ………………………………………………………………………………………………………….
(d) Nitrogen, oxygen and other substances are found in clean, dry air.
(i) State the percentage of nitrogen in clean, dry air.
(ii) Other than nitrogen and oxygen, identify another element found in clean, dry air.
(iii) Identify a compound found in clean, dry air.
(iv) Nitrogen and oxygen can be separated from liquid air.
State the name of this process.
Answer/Explanation
Answer:
(a) chlorine
(b) fluorine
(c) (i) random motion of molecules/particles
(ii) hydrogen
lowest (relative) molecular mass
(d) (i) 78
(ii) argon/Ar
(iv) fractional (1)
distillation (1)
Question
(a) The table gives information about some atoms or ions, A, B and C.
Complete the table.[4]
(b) (i) Carbon is an element.
Define the term element. [1]
(ii) \(_{6}^{12}\textrm{C}\), \(_{6}^{13}\textrm{C}\) and \(_{6}^{14}\textrm{C}\) are isotopes of carbon.
Complete the table.[2] [Total: 7]
Answer/Explanation
Ans:
2(a)
2(b)(i) element
EITHER (substance) made of atoms with the same atomic number / number of protons / proton number
OR a substance that cannot be split up / broken down into two or more simple(r) substances by chemical means
2(b)(ii) M1 6 protons in all three rows(1)
M2 6,7 and 8 neutrons(1)