Revision 2-Chemical Reaction Flashcards
Name five ways that you can notice a chemical reaction
Temperature change Colour change New substance formed Gas is being produced (fizzing) A bright light
What is a controlled variable?
Something that is unchanged
What is an independent variable?
Something that you are changing
What is a dependant variable?
Something that you are measuring
What is a physical change?
When two elements can be changed to one thing and back to its original state e.g. water 👉ice👉water
What is a chemical change?
When you see, smell a change to the substance
What is a mixture?
When two or more elements are mixed together
What is the equation for iron sulphide?
iron+sulpher=iron sulphide
Is iron sulphide magnetic and why?
Yes because they react together when they are burned and melt together, so the whole compound becomes a magnetic
Is iron and sulphur magnetic when mixed together and why?
No because they are still two separate elements
Does the mass change during a chemical reaction and how?
Yes. The mass goes down because when they react a gas is produced which lowers the weight of the compound
How many elements are there in the compound MgO and what are their names?
- Magnesium and Oxygen=Magnesium Oxide
How many elements are there in the compound CaOH and what are their names?
- Calcium, Oxygen and Hydrogen=Calcium Hydroxide
How many elements are there in the compound CaCO3 and what are their names?
- Calcium, Carbon and Oxygen3=Calcium Carbonate
What is NaCl in a word equation?
Sodium+Chlorine=Sodium Chloride
