Chapter 8 Flashcards
What are chemical reactions
When reactants combine to form products
What are exothermic reactions
Reactions that release energy from chemicals to surrounding, increasing room temp
What is fuel
Substances that react with oxygen , they have stored chemical energy
What are fossil fuels
Formed from dead animals and plants that didn’t rot and have stored carbon
What are the 3 types of fossil fuels
Oil, coal and natural gas
What is burning/combustion
Chemical reactions where a substance reacts with oxygen
What 3 things are needed for combustion to occur
Fuel, heat, oxygen
What’s another word for spread
Dissipate
Write a word equation for burning magnesium
Magnesium + oxygen==> magnesium oxide
What is burning hydrogen used for
Fuel in model rockets
What energy does chemical energy turn into when fuel burns
Thermal and sound energy
What sound is made when carbon dioxide is produced?
Fizzing
What sound is made when hydrogen is produced
Pop sound
What is an example of an exothermic reaction with water
Potassium + water ==> potassium hydroxide + hydrogen
What is anither example of exothermic reaction with acid
Magnesium + hydrochloric acid==> magnesium chloride + hydrogen
What is endothermic reaction
Chemical reactions where thermal energy from surrounding is transferred to chemical energy stiredij chemical bonds
What is an example of an exothermic reaction
Sodium hydroxide + citric acid==> sodium citrate + water + carbon dioxide
What’s a snack that contains an endothermic reaction
Sherbet lemons
Waht makes endothermic process different from reaction
- No product
- No Chemical reaction
An example of an endothermic process
Potassium chloride+ water
How is ice melting an endothermic process
Chemical energy stored in chemical bonds make particles vibrate more, overcoming the force and changing to liquid state
What are 2 daily uses of endothermic reaction/ processes
- Self heating cans(reaction)
- Ice packs(proccess)
What word equation is present in self heating cans
Calcium oxide + water==> calcium hydroxide
What 2 types of ice packs are there
- Ammonia nitrate + water
- Ice and water
