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Chemical Reactions
| Question | Answer |
|---|---|
| WHAT IS A PHYSICAL CHANGE? | A physical change is a change that can be reversed and no new substance is formed Examples include: Crushing can Breaking glass Chopping wood |
| WHAT IS A CHEMICAL CHANGE? | A chemical change is a change that cannot be reversed and NEW substances are formed Examples include: Baking a cake Rusting of iron Burning of wood |
| WHAT ARE THE SIGNS OF A CHEMICAL CHANGE | Colour change Temperature change Production of light Change in taste or smell Formation of bubbles Change in volume |
| WHAT IS A CHEMICAL REACTION? | A chemical reaction is a change that results in the formation of one or more NEW substances |
| WHAT FACTORS AFFECT RATE OF REACTION | Types of reactants Surface area Concentration Temperature Catalysts |
| HOW DO WE KNOW HYDROGEN IS PRESENT? | If hydrogen is present you will hear a ‘squeaky pop’ sound when you place a lit splint into the test tube |
| WHAT IS ACTIVATION ENERGY | Activation energy is the minimum amount of energy that reactant particles must have in order for a reaction to occur |
| WHAT IS A BIOCHEMICAL REACTION | A biochemical reaction is a chemical reaction that occurs in living things (organisms) |
| EXAMPLES OF BIOCHEMICAL REACTIONS | Photosynthesis Respiration Digestion |
| WHAT ARE ENZYMES | Enzymes are biological catalysts They speed up biochemical processes |
| WHAT FACTORS THAT AFFECT RATE OF BIOCHEMICAL REACTION | Concentration Temperature pH |
Created by:
JMahango
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