Chemical reaction Flashcards
What is a chemical reaction?
A chemical reaction is a change in which atoms are rearranges to make new substances
True or false? Chemical reactions are not easily reversible.
True
What do chemical reactions transfer?
Chemical reactions transfer energy to or from the surroundings
What are three pieces of evidence that may suggest that a chemical reaction is happening?
See huge flames or tiny sparks, notice a sweet smell, notice a foul smell, getting hotter, getting colder, hear a loud bang, hear a gentle fizz.
What are three examples of useful products made in chemical reactions?
Medicines, fabric and building materials
Are all changes a chemical reaction?
No, you see if you warm chocolate, it melts, but it is still chocolate
What is physical changes?
Changes of state, and dissolving, are reversible
What are Materials made of?
Materials are made up of tiny objects called particles
Can you see particles?
No, the particles are too small to see, even with a microscope
Are all particles the same?
No, some materials are mixtures and some are not.
What are non mixture materials?
They consist of just one substance. They include gold, pure water and oxygen
What is properties of a substance?
The properties of a substance describes what it looks like and how it behaves
What is a particle model?
The particle model is a way of thinking about how a substance behaves in terms of its tiny moving or vibrating sutbstance
What are three factors that give a substance of its properties?
1) What it’s particles are like
2) How it’s particles are arranged
3)How it’s particles move around
What can you use a particle model for?
You can use the particle model to explain properties of substances
