C1.3 Chemical Reactions Flashcards
(30 cards)
What is a chemical reaction?
When atoms are rearranged to make new substances
What happens to the atoms in a chemical reaction?
They are arranged in a different way.🌌🌌
What are three pieces of evidence a chemical reaction has taken place.
See, hear, smell, temperature change👂
Why are chemical reactions useful?
They make useful substances, transfer energy.🌩
What do you call something that can speed up a chemical reaction without being used up?
A catalyst.🚤
What is the difference between a chemical reaction and a physical reaction?
A chemical reaction can’t be reversed; a physical reaction can.👎
What is a reactant?
The starting substances in a chemical reaction.🥇
What is a product?
The substances made from a chemical reaction🥈
What is a word equation?
Represents a chemical reaction.👓
What do you call a material that burns to transfer energy by heating?
A fuel.⛽️⛽️
Give three examples of fuels
Petrol, diesel, coal hydrogen⛽️ .
What is the scientific term for burning??
Combustion🔥🔥
What are the products of combustion?
Carbon dioxide and water.💧
What is oxidation?
When a substance reacts with oxygen.📖
What do we call a fuel made from the remains of animals and plants that died millions of years ago?
Fossil fuels.⛽️
What does non-renewable mean?
Cannot be replaced.🥖
Give 3 examples of fossil fuels
Petrol diesel coal methane ⛽️ .
What is the name given to a chemical reaction where a compound breaks down to form simpler compounds to form simpler compounds and/or element.
Decomposition▫️
What is thermal decomposition?
When a substance breaks down on heating.🔥
Give an example of thermal decomposition reaction, stating the products.
Copper carbonate breaks down to copper oxide and carbon dioxide.
🤒
What does conservation of mass mean?
The total mass of the reactant is equal to the total mass of the products.🏋♀️
What is a balanced symbol equation?
By knowing that the total mass of reactants is equal to the total mass of products.🏋♂️
What is a balanced symbol equation?
They show the formulae of reactants and products, the relative amounts of each as well as how the atoms are rearranged.⚛️
What do the big numbers in front of elements/compound in a balanced equation represent?
The number of atoms of that element/compound.1️⃣
