science revision yr 8 2024 exam Flashcards
science
what is a independent variable?
An independent variable is the cause.
what is a depended variable?
A dependent variable is the effect.
what is an hypothesis?
A hypothesis is an assumption that is made based on some evidence. An educated guess
what are the periodic table elements?
hydrogen
helium
lithium
beryllium
boron
carbon
nitrogen
oxygen
flourine
neon
sodium
magnesium
aluminium
silicon
Phosphorus
sulfur
chlorine
argon
potassium
calcium
what is controlled variable?
A control variable is anything that is held constant in a study to prevent it from interfering with the results.
what is a chemical change?
Chemical changes result in the production of a new substance and cannot be reversed.
what is a physical change?
Physical changes do not produce a new substance.
what is corrosion?
Corrosion is an all-too-common result of electrochemical reactions between materials and substances in their environment.
what is combustion?
Combustion, a chemical reaction between substances, usually including oxygen and usually accompanied by the generation of heat and light in the form of flame
What does the atomic number of an element represent?
number of protons
What is the element gold made of?
Gold atoms
What is the name given to elements that have features of both metals and non-metals?
Metalloids
How do compounds differ from elements?
Compounds contain atoms of more than one type of element.
What is a molecule?
a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
What is the difference between reactants and products?
Chemical reactions begin with reactants and end with products
