Homework week 1 26th Feb

• Science
• Lower Secondary (Key Stage 3)

Homework week 1, 26th Feb

The start of the reaction the chemicals are called...

1. Products
2. Reactants

The end of the reaction the chemicals are called...

1. Products
2. Reactants

Describe the conservation of atoms

Describe the conservation of mass.

What type of reaction absorbs heat from the surroundings?

1. Catalytic
2. Endothermic
3. Spontaneous
4. Exothermic

In an endothermic reaction, does the temperature of the surroundings increase or decrease?

1. Fluctuate
2. Decrease
3. Increase
4. Stay the same

In which type of reaction is heat released to the surroundings?

1. Combustion reaction
2. Exothermic reaction
3. Catalytic reaction
4. Endothermic reaction

Which reaction results in a temperature rise in the surroundings?

1. Spontaneous reaction
2. Exothermic reaction
3. Endothermic reaction
4. Reversible reaction

Describe thermal decomposition and include examples.

Describe combustion in terms of fuels and give examples.