1.
State what is meant by atomic structure.
[1 mark]
- protons and neutrons in the nucleus, electrons in shells
JD SCIENCE
Core chemistry
Indicative marking points. Award marks for equivalent scientific or mathematical wording. Do not issue this sheet with the student worksheet.
2.
State what is meant by bonding.
[1 mark]
- ionic, covalent, metallic
3.
State what is meant by a mole.
[1 mark]
- 6.02 × 10²³ particles
4.
State what is meant by a balanced equation.
[1 mark]
- same atoms on both sides
5.
State what is meant by concentration.
[1 mark]
- moles or grams per dm³
6.
State what is meant by an acid–base reaction.
[1 mark]
- H⁺ + OH⁻ → H₂O
7.
State what is meant by rate of reaction.
[1 mark]
- change in amount / time
8.
State what is meant by an equilibrium.
[1 mark]
- forward and reverse rates equal in a closed system
9.
State what is meant by organic chemistry.
[1 mark]
- carbon compounds, functional groups
10.
State what is meant by chemical analysis.
[1 mark]
- identify or quantify a substance
11.
Noah is asked about atomic structure in a NCFE Science paper.
(a) [2 marks]
- atomic number and mass number
(b) [3 marks]
- ions form by electron transfer
12.
Noah is asked about bonding in a NCFE Science paper.
(a) [2 marks]
- explains MP, conductivity, solubility
(b) [3 marks]
- used when choosing materials
13.
Noah is asked about a mole in a NCFE Science paper.
(a) [2 marks]
- n = m/M = cV
(b) [3 marks]
- basis of all lab calculations
14.
Noah is asked about a balanced equation in a NCFE Science paper.
(a) [2 marks]
- gives mole ratios
(b) [3 marks]
- needed before a yield calculation
15.
Noah is asked about concentration in a NCFE Science paper.
(a) [2 marks]
- c = n/V
(b) [3 marks]
- prepare with a volumetric flask
16.
Noah is asked about an acid–base reaction in a NCFE Science paper.
(a) [2 marks]
- salt plus water
(b) [3 marks]
- followed by titration
17.
n in 8.0 g NaOH (M=40)
[3 marks]
- Final answer: 0.20 mol
18.
c if 0.025 mol in 250 cm³
[3 marks]
- Final answer: 0.10 mol dm⁻³
19.
Titre 24.80 cm³ of 0.100 mol dm⁻³. Moles?
[3 marks]
- Final answer: 0.00248 mol
20.
Mr of CaCO₃ (Ca40, C12, O16)
[3 marks]
- Final answer: 100
21.
Percentage yield 7.2 g from 9.0 g
[3 marks]
- Final answer: 80%
22.
Rate: 40 cm³ gas in 50 s
[3 marks]
- Final answer: 0.80 cm³/s
23.
Noah carries out a T-Level occupational task on T-Level core chemistry. This is a typical NCFE required-practical style question.
(a) [2 marks]
- Independent: the factor being investigated
- Dependent: the measured result or quality check
(b) [2 marks]
- follow the SOP and keep other variables constant
- so the test is fair / only one variable is changed
(c) [2 marks]
- not recording the batch/lot number or operator ID
24.
Noah carries out writing or following an SOP for T-Level core chemistry. This is a typical NCFE required-practical style question.
(a) [2 marks]
- Independent: a step in the method
- Dependent: whether the acceptance criteria are met
(b) [2 marks]
- same calibrated instrument
- so the test is fair / only one variable is changed
(c) [2 marks]
- skipping a verification check
25.
Noah carries out a COSHH / risk-assessment review for T-Level core chemistry. This is a typical NCFE required-practical style question.
(a) [2 marks]
- Independent: hazard
- Dependent: control measure effectiveness
(b) [2 marks]
- same PPE and waste route
- so the test is fair / only one variable is changed
(c) [2 marks]
- using expired reagents or the wrong waste stream
26.
Noah carries out data review in a LIMS or quality log for T-Level core chemistry. This is a typical NCFE required-practical style question.
(a) [2 marks]
- Independent: sample ID
- Dependent: result vs specification
(b) [2 marks]
- same calculation method
- so the test is fair / only one variable is changed
(c) [2 marks]
- transcription error between the instrument and the LIMS
27.
Compare atomic structure with a balanced equation.
[4 marks]
- protons and neutrons in the nucleus, electrons in shells
- same atoms on both sides
- state one workplace implication
28.
Compare bonding with concentration.
[4 marks]
- ionic, covalent, metallic
- moles or grams per dm³
- state one workplace implication
29.
Compare a mole with an acid–base reaction.
[4 marks]
- 6.02 × 10²³ particles
- H⁺ + OH⁻ → H₂O
- state one workplace implication
30.
Compare a balanced equation with rate of reaction.
[4 marks]
- same atoms on both sides
- change in amount / time
- state one workplace implication
31.
Apply your knowledge of rate of reaction to this situation: collision theory
[3 marks]
- collision theory
32.
Apply your knowledge of an equilibrium to this situation: Le Chatelier
[3 marks]
- Le Chatelier