| Date | November 2020 | Marks available | 1 | Reference code | 20N.1.sl.TZ0.9 |
| Level | SL | Paper | 1 | Time zone | TZ0 |
| Command term | Deduce | Question number | 9 | Adapted from | N/A |
Question
Which formula is correct?
A.
B.
C.
D.
Markscheme
C
Examiners report
64% of candidates picked the correct formula for ammonium phosphate with (NH4)2PO4 being the incorrect answer chosen most frequently. NH4PO4 or (NH4)3(PO4)2 was rarely selected.
Syllabus sections
-
18M.2.sl.TZ1.2a:
Describe the nature of ionic bonding.
- 18M.1.sl.TZ2.9: What is the formula of magnesium nitride? A. MgN B. Mg2N3 C. Mg3N D. Mg3N2
-
22M.2.sl.TZ1.1g:
State the types of bonding in magnesium, oxygen and magnesium oxide, and how the valence electrons produce these types of bonding.
-
18M.1.sl.TZ1.9:
What is the formula of ammonium phosphate?
A. (NH3)3PO4
B. (NH4)3PO4
C. (NH4)2PO4
D. (NH3)2PO3
-
17M.2.sl.TZ1.2e.i:
State the type of bonding in potassium chloride which melts at 1043 K.
-
22M.1.sl.TZ2.9:
Which statement best describes the intramolecular bonding in HCN (l)?
A. Electrostatic attractions between H+ and CN− ions
B. Hydrogen bonding
C. Van der Waals forces and hydrogen bonding
D. Electrostatic attractions between pairs of electrons and positively charged nuclei
- 17M.1.sl.TZ1.9: A substance has the following properties: What is the most probable structure of this...
- 22M.1.sl.TZ1.9: A compound consists of the ions Ca2+ and PO43–. What are the name and formula of the...
-
17M.1.sl.TZ2.10:
Which bonds cause the boiling point of water to be significantly greater than that of hydrogen sulfide?
A. London (dispersion)
B. Covalent
C. Ionic
D. Hydrogen
- 22M.1.sl.TZ1.10: What is the explanation for the high melting point of sodium chloride? A. The covalent bond...
- 22M.1.hl.TZ2.9: In which of the following compounds does ionic bonding predominate? A. HCl B. NaF C. ...
- 19N.1.sl.TZ0.9: Which is correct for all solid ionic compounds? A. High volatility B. Poor electrical...
-
19M.1.hl.TZ1.10:
What is the IUPAC name of NiCO3?
A. nickel(II) carbonate
B. nickel carbonate
C. nickel(I) carbonate
D. nitrogen(I) carbonate
-
18M.2.hl.TZ1.2a:
Describe the nature of ionic bonding.
-
17M.1.sl.TZ2.19:
Which of the following does not react with dilute HCl(aq)?
A. Na2CO3
B. Cu
C. Zn
D. CuO
- 21N.1.sl.TZ0.10: Which combination would create the strongest ionic bond?
- 21N.1.sl.TZ0.11: Which compound contains both ionic and covalent bonds? A. CH3COONa B. CH3COOH C. ...
- 18N.2.sl.TZ0.4b.ii: State a physical property of sodium oxide.
- 19M.1.hl.TZ2.9: How does a lithium atom form the most stable ion? A. The atom gains a proton to form a...
-
19M.2.hl.TZ1.3c:
Describe the structure and bonding in solid sodium oxide.
- 19M.1.sl.TZ2.9: How does a lithium atom form the most stable ion? A. The atom gains a proton to form a...
-
17M.2.sl.TZ2.1c.ii:
Explain the electrical conductivity of molten Na2O and P4O10.
-
22M.1.sl.TZ2.11:
What is the name of the compound with formula Ti3(PO4)2?
A. Titanium phosphate
B. Titanium(II) phosphate
C. Titanium(III) phosphate
D. Titanium(IV) phosphate
- 16N.2.sl.TZ0.4f: Describe the structure and bonding in solid magnesium oxide.
-
16N.3.hl.TZ0.22c:
(i) Uranium hexafluoride, UF6, is used in the uranium enrichment process that produces fuel for nuclear reactors.
State the molecular shape of uranium hexafluoride.
(ii) Explain why uranium dioxide, UO2, has a very high melting point whereas uranium hexafluoride vapourises easily into gas.
-
19M.2.sl.TZ2.5b(iii):
Identify the type of bonding in sodium hydrogencarbonate.
Between sodium and hydrogencarbonate:
Between hydrogen and oxygen in hydrogencarbonate:
-
21M.1.sl.TZ2.11:
What is the formula of the compound formed from Ca2+ and PO43−?
A. CaPO4
B. Ca3(PO4)2
C. Ca2(PO4)3
D. Ca(PO4)2
-
19M.2.sl.TZ1.3a(i):
Describe the structure and bonding in solid sodium oxide.
-
19N.3.sl.TZ0.17b:
Aspirin, C6H4(OCOCH3)COOH, is only slightly soluble in water.
Outline, including an equation, how aspirin can be made more water-soluble. Use section 37 in the data booklet.
-
17M.3.sl.TZ1.6b:
Lanthanum has a similar electronegativity to group 2 metals. Explain, in terms of bonding and structure, why crystalline lanthanum bromide is brittle.
-
19M.2.hl.TZ2.5d(i):
Identify the type of bonding in sodium hydrogencarbonate.
Between sodium and hydrogencarbonate:
Between hydrogen and oxygen in hydrogencarbonate:
- 21M.1.sl.TZ1.11: Which substance is most likely to be ionic?
-
21M.1.sl.TZ1.10:
Which compound contains both ionic and covalent bonds?
A.
B.
C.
D.
- 21M.2.hl.TZ1.1d(v): Suggest why chemists find it convenient to classify bonding into ionic, covalent and metallic.
- 21M.2.hl.TZ1.3a: Deduce the ratio of Fe2+:Fe3+ in Fe3O4.
- 21M.1.hl.TZ2.12: Which atom has an expanded octet? A. C in CO2 B. S in SCl4 C. O in H2O2 D. P in PCl3
- 21M.2.sl.TZ1.1c(i): Describe the bonding in this type of solid.
- 21M.2.sl.TZ1.3a: Deduce the ratio of Fe2+:Fe3+ in Fe3O4.
-
22M.2.hl.TZ1.1g:
State the types of bonding in magnesium, oxygen and magnesium oxide, and how the valence electrons produce these types of bonding.
- 21M.2.sl.TZ1.1c(iv): Suggest why chemists find it convenient to classify bonding into ionic, covalent and metallic.
- 22M.1.sl.TZ2.10: What is the type of bonding in a compound that has high boiling and melting points, poor...
- 21M.2.hl.TZ1.1d(i): Describe the bonding in this type of solid.
