Ideal Gas Markscheme

# Ideal Gas Markscheme - 13 12 11 10 5.0 10 15 20 P ×10 N m...

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Unformatted text preview: 13 12 11 10 5.0 10 15 20 P / ×10 N m 6 2 –2 PV / ×10 N m (a) suitable straight-line of best fit; 1 (b) A is the intercept on the y-axis consistent with line drawn (or by implication); = 12.6 = 1.3 × 10 3 Nm – the best fit line should give a 2 SD value of 1.3 × 10 3 Nm; B is the gradient; some evidence that reasonable values have been used ( y 2 – y 1 > 0.9, x 2 – x 1 > 8); = –1.0( ± 0.1) × 10 –5 ; 5 Accept answers based on using two data points on line. Award [3 max] if points not on line. Ignore any missing units and do not penalize if minus sign is omitted. Award [1] for determination of B if only one data point is used. (c) B = 0; 1 (d) (i) substitute into PV = A + BP PV = 1300 – (1.0 × 10 –5 × 6.0 × 10 7 ); = 700(640 → 760)Nm; 2 = 1.9( ± 0.5) × 10 3 Nm if BP is added instead of subtracted. Award [1] for ecf. (ii) recognize that the ideal gas value is the intercept on the y-axis; or from PV = RT ; or = constant A; difference 600(540 → 660) Nm; 2 (e) error bars constructed on two well separated points; attempt to draw reasonable extreme graph line / lines; reasonable estimate of uncertainty; V P 1 ∝ P V 1 ∝ T P T P ′ = 2 1 1 ; 1 2 1 T P T P = ′ Accept alternative approach....
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## This note was uploaded on 09/21/2009 for the course PHYSICS 2211 taught by Professor Uzer during the Fall '08 term at Georgia Tech.

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Ideal Gas Markscheme - 13 12 11 10 5.0 10 15 20 P ×10 N m...

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