general Flashcards
What is an alloy?
An alloy is a mixture of two or more metals, or a metal and another element, designed to have specific properties. eg steel is an alloy made from iron and carbon.
What is a mixture
A mixture is a combination of two or more substances that are not chemically bonded. components of a mixture can be physically separated and retain their individual properties.
What is an element
an element is a pure substance made up of only one type of atom.
What is a compound
compound is a substance formed when two or more different types of atoms bond together in a fixed ratio. Compounds have properties different from the individual elements that compose them. eg water (H₂O) is a compound.
What is an atom
An atom is the smallest unit of matter that retains the properties of an element. It consists of a nucleus made of protons and neutrons, surrounded by electrons.
pop tests used for
hydrogen
bubbling gas through lime used for
carbon dioxide
What is a molecule
a group of two or more atoms bonded together
What are columns in periodic table
groups- determine similar chemical properties
What are periods in periodic table
rows- indicate similar energy
how to find amount of neutrons in element
atomic mass minus atomic number
what causes radioactive decay
instability in the nucleus
