Science Flashcards
What is a chemical reaction?
Reaction which takes place when there is a change that is ireversible.
List three things that help you know a chemical change has occurred.
- A gas has been given off. Bubbles
- Change in colour
- Change in temperature
What does conservation of mass mean?
Atoms can’t disappear or reappear out of nowhere.
List the reactivity series in order of most reactive to least reactive.
Potassium, sodium, calcium, magnesium, aluminium, carbon, zinc, iron, lead, hydrogen, copper, silver, gold.
Two reactants can react to form a substance called the what?
Product
What does MASH stand for?
Metal+acid - Salt+hydrogen
What does BAWS stand for?
Base+acid - Water+salt
What does CAWCS stand for?
Carbonate+acid - Water+carbon dioxide+salt
What are the different kinds of energy stores?
Nuclear, chemical, elastic, kinetic, electrostatic, magnetic, thermal, gravitational.
What are the different ways of transferring energy?
Radiation, mechanically, heating, electrically.
Metal oxides dissolve in water to form what?
An alkali solution called a hydroxide.
Define element.
Materials made up of one type of atom only.
Define compound.
A substance produced when two or more elements are chemically combined in a chemical reaction.
Define mixture.
Contains two or more substances that have not reacted with each other. They can be separated back into the elements or molecules they contain.
Define atom.
One particle of a substance. It can be joined to other atoms or it can be on its own.
Define molecule.
Two or more atoms which are chmeically joined together (bonded). They can be made from the same type of atoms or different atoms.
What is the periodic table?
Presents all the known elements into a pattern according to their properties.
What is a group and period on the periodic table.
Group- vertical columns in the periodic table.
Period- horizontal rows in the periodic table.
Combustion=
Fuel+Oxygen=Water+Carbon Dioxide.
What are the products of incomplete combustions?
Water and Carbon Monoxide.
When white light is passed through a prism it is dispersed into a spectrum of which colours?
ROYGBIV.
What is an acid? What is an alkali?
An acid is a chemical which has a pH of less than 7 on the pH scale.
An alkali is a chemical which has a pH of more than 7 on the pH scale.
How many numbers are there on the pH scale?
14
When a base is soluble it is called a what?
An alkali solution.
