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NbSci Chem Raections

QuestionAnswer
What is a physical change? A physical change is when a substance changes its appearance (eg a state change) and a new product is NOT formed.
What type of reaction is cutting a piece of paper? Physical
What is a chemical change? Is when a new substance is made.
What type of change is baking a cake? Chemical
State the three states of matter solid, liquid and gas
How can we increase the rate of a chemical reaction? Increasing the temperature, Decreasing the particle size, Using a catalyst, increasing concentration
What type of change is corrosion? Chemical
Give two examples of physical change. Ice melting, kettle boiling, lava cooling down to a rock
What are the signs of chemical change? Change in energy, change in colour, gas being produced and formation of precipitate
True or false, a chemical change can easily be reversed? FALSE
Increasing the temperature should _____ the rate of a reaction. Increase
Increase particle size should _____ the rate of a reaction. Decrease
Adding a catalyst should ______ the rate of a reaction. Increase
What is produced when aluminium reacts with oxygen? Aluminium oxide
In a chemical reaction, products are placed _________ the arrow after
In a chemical reaction, reactants are placed _________ the arrow before
Why does food cook faster at a higher temperature? Increasing the temperature increases the rate of reaction
Why is undiluted more effective at killing microorginisms? Increasing the concentration increasing the rate of reaction
Why does sawdust burn faster than a lump of wood? Decreasing the particle size increases the rate of reaction
Why does hydrogen peroxide breaks down faster when a catalyst is used. A catalyst speeds up the rate of reaction,
In industry which catalyst is used in the production of margarine? nickel
What is an enzyme? A biological catalyst
What enzyme if used to break down starch during digestion? amylase
What is a variable in a science investigation a factor that can be changed.
Why should variables be controlled in an investigation? To ensure a fair test
What is lipase used for in the body To break down fat during digestion
What catalyst is used in the production of ammonia iron
Created by: user-2019887
 

 



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