reactivity Flashcards
what is physical change ?
no need to products in a reaction
what is chemical reaction?
when a new product is formed in a reaction
what’s a word equation ?
represents a chemical reaction using the names of the substances involved
what’s the reactants ?
the left hand side of the word equation
what’s a product ?
the right hand side of the word equation
what are the 3 ways you could increase a gas pressure inside a container ?
- Increase number of gas particals
- Decrease size of container
- Increase temperature
what’s rust?
when metal comes in contact with air and water
what are the two methods to prevent rusting
using a physical barrier or adding a block of more reactive metals
why do smaller pieces of a substance react faster ?
because more surface area is exposed
what’s the role of an oxidising agent ?
provided oxygen needed
what’s exothermic ?
the temperature decreases in a reaction
what’s endothermic ?
the temperature increases in a reaction
what’s the test for oxygen?
the glowing splint test
what’s the word equation for the combustion of methane ?
methane + oxygen —> carbon dioxide + water
what’s the most reactive metal ?
potassium
what’s the least reactive metal ?
platinum
why are silver and gold used for jewellery?
because they are not very reactive
what’s an ore ?
a natural rock that comes from one or more valuable minerals
what’s a displacement reaction ?
when a metal is stronger than another metal and takes over in a reaction
what’s native state ?
when a metal is found in the earth as an elelment
