Miscellaneous

Question 1

State the law of Conservation of Mass in a reaction

Answer 1

The mass of the reactants must always equal the mass of the products

Question 2

write the word equation for incomplete combustion

Answer 2

Hydrocarbon + Oxygen –> Carbon Monoxide + Soot (Carbon) + Water

Question 3

write the word equation for complete combustion

Answer 3

Hydrocarbon (fuel) + Oxygen –> Water + Carbon Dioxide

Question 4

be able to label the bunsen burner

Answer 4

1. Gas Jet (where the gas from the gas inlet comes in)
2. Collar (the tube you twist with the air hole)
3. Barrel (where the flames comes out of)
4. Air Hole (the hole on the collar)

Question 5

know how to light and use a bunsen burner safely

Answer 5

When lighting it, light it on the safety flame with the air hole fully closed.

When heating something, use the heating flame with the air hole fully open.

Question 6

know the difference between a control, independent and dependent variable

Answer 6

A control variable is always the same throughout the experiment.

An independent variable it the one you change.

A dependent variable is the variable that is influenced by the independent variable and control variable.

Question 7

what is thermal decomposition

Answer 7

the breaking down of a substance using heat

Question 8

what is the equation for thermal decomposition

Answer 8

element 1 element 2…ate → element 1 oxide + element 2 dioxide
e.g. copper carbonate → copper oxide + carbon dioxide