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

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