Energy from Feuls

Question 1

what is the definition of a feul

Answer 1

chemicals which burn and release energy

Question 2

what is an exothermic reaction

Answer 2

chemical reactions that release energy. This means that energy is being released into the surroundings

Question 3

what is an endothermic reaction

Answer 3

chemical reactions which take in energy

Question 4

what does hydrocarbon + oxygen make

Answer 4

carbon dioxide + water

Question 5

what type of reaction is combustion

Answer 5

exothermic

Question 6

attempt this exam style question:

1. what mass of carbon dioxide is produced when 5g of propane burns in good air supply?

or

2. calculate the mass of propanol required to produce 3g of carbon dioxide on complete combustion

Answer 6

1. = 15g

2. = 1.38g

Question 7

what is the general equation for measuring energy changes

Answer 7

Eh=cm^T

Question 8

what does the ^T stand for

Answer 8

the temperature change in C

Question 9

what does the m stand for

Answer 9

the mass of water heated in kg

Question 10

what does the c stand for

Answer 10

the specific heat capacity of water (4.18kj)

Question 11

what does the Eh stand for

Answer 11

the energy released

Question 12

why do some results of the experiament loose energy

Answer 12

most of the heat produced is being lost to the surroundings

Question 13

what is it called when heat is being lost to the surroundings

Answer 13

incomplete combustion

Question 14

how do we improve the experiment

Answer 14

use a bomb colorimeter

Question 15

try this practice question:

1. calculate the energy released by a feul when the teperature of 100g of water is raised by 6C by heating

Answer 15

2.508kj

working in jotter 3

Question 16

What is produced when there is an incomplete combustion

Answer 16

Carbon monoxide + carbon (soot)