Higher Tier
You must have: Total Marks
Ruler, calculator
Instructions
•• Use black ink or ball-point pen.
Fill in the boxes at the top of this page with your name,
centre number and candidate number.
•• Answer all questions.
Answer the questions in the spaces provided
– there may be more space than you need.
Information
•• The total mark for this paper is 100.
The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
• Inability
the questions marked with an asterisk (*), marks will be awarded for your
to structure your answer logically, showing how the points that you make
are related or follow on from each other where appropriate.
Advice
•• Read each question carefully before you start to answer it.
Try to answer every question.
• Check your answers if you have time at the end.
Turn over
, Answer ALL questions. Write your answers in the spaces provided.
Some questions must be answered with a cross in a box . If you change your mind about an
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
answer, put a line through the box and then mark your new answer with a cross .
1 A bomb calorimeter is used to measure the energy content of a food sample.
Figure 1 shows a bomb calorimeter.
ignition wires
stirrer
water
food
Figure 1
The mass of the food sample is measured at the start.
The food sample is burnt and the temperature rise of the water is measured.
(a) (i) Describe how the temperature rise of the water is measured.
(2)
, (ii) The energy content of the food is calculated using the equation:
mass of water (g) × temperature rise (°C) × 4.2
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
energy content (J/g) =
mass of food (g)
The bomb calorimeter was used to find the energy content of a biscuit.
The mass of water was 1 000 g, the temperature rise was 69.4 °C and the mass
of the biscuit was 14.7 g.
Which is the energy content of this biscuit?
(1)
A 291 480 J/g
B 19 829 J/g
C 69 400 J/g
D 4 721 J/g
(iii) A different biscuit with the same mass gave a temperature rise of 78.2 °C.
Give one reason why this biscuit gave a greater temperature rise.
(1)
, (b) Figure 2 shows the equipment used in a school laboratory to measure the energy
content of a food sample.
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
Figure 2
Explain why a bomb calorimeter gives a more accurate value than this equipment
for the energy content of a food sample.
(3)
Les clients de Stuvia ont évalués plus de 700 000 résumés. C'est comme ça que vous savez que vous achetez les meilleurs documents.
L’achat facile et rapide
Vous pouvez payer rapidement avec iDeal, carte de crédit ou Stuvia-crédit pour les résumés. Il n'y a pas d'adhésion nécessaire.
Focus sur l’essentiel
Vos camarades écrivent eux-mêmes les notes d’étude, c’est pourquoi les documents sont toujours fiables et à jour. Cela garantit que vous arrivez rapidement au coeur du matériel.
Foire aux questions
Qu'est-ce que j'obtiens en achetant ce document ?
Vous obtenez un PDF, disponible immédiatement après votre achat. Le document acheté est accessible à tout moment, n'importe où et indéfiniment via votre profil.
Garantie de remboursement : comment ça marche ?
Notre garantie de satisfaction garantit que vous trouverez toujours un document d'étude qui vous convient. Vous remplissez un formulaire et notre équipe du service client s'occupe du reste.
Auprès de qui est-ce que j'achète ce résumé ?
Stuvia est une place de marché. Alors, vous n'achetez donc pas ce document chez nous, mais auprès du vendeur premiumpapers. Stuvia facilite les paiements au vendeur.
Est-ce que j'aurai un abonnement?
Non, vous n'achetez ce résumé que pour 6,20 €. Vous n'êtes lié à rien après votre achat.