Atoms
What part of an atom has a positive charge and what part of an atom has a neutral charge?
A proton & A neutron
2/3 of the elements on the periodic table are ___________.
Metals
Scientists have created a table to organize the elements according to their______________.
atomic number
_______________ is when a substance changes from a solid into a gas
Sublimation
Evaporation is a substance changing from a gas to a liquid.
FALSE
It's liquid to a gas
Molecules are made up of ____________
Atoms
________________ have negative charges and arrange themselves in _____________ around the nucleus.
Electrons & Shells(levels)
What is the scientific formula for Carbon Dioxide?
CO2
According to the Periodic Table, elements are arranged according to the number of ____________ and ____________.
Protons and electrons
A piece of clay is moulded into a teddy bear.
Is this a physical or chemical change?
A physical change
A liquid cannot have a fixed shape.
TRUE
Liquids take on the shapes of their container
What particle is responsible for the atomic mass not always being a whole number?
Neutrons
Chemical reactions only involve these particles of an element.
Electrons
What is the name of the electrons on the outer shell of an element?
Valence
What are two alkali metals?
lithium, sodium, potassium, rubidium, cesium, francium
An ice cube melts in your soft drink.
Is this a physical or chemical change?
A physical change
A positive and a negative ion are attracted to each other and this is called an ionic compound
TRUE
What is the chemical formula for Sodium oxide?
Na2O
Two or more atoms chemically combined are called __________________
Molecules or Compounds
What is a pure substance that cannot be broken down more?
An element
This family of elements are not reactive under regular chemical situations.
Noble gases
Is the colour of an iron bar changing as a result of rusting a physical or chemical change?
A chemical change
The hotter something is, the more molecules it has and the more crowded they get.
FALSE
What is the chemical formula for magnesium chloride?
MgCl2
What is a charged atom called?
An ion
When a metal and a non-metal combine, this is called ....
an ionic compound
What are the letters that represent an element on the periodic table called?
Atomic Symbols
TRUE or FALSE:
Three indicators of a chemical change are:
light is produced, shape changes, new substances are produced
FALSE
shape changing is not evidence of a chemical change
Physical changes can change the chemical properties of a substance.
FALSE
Polyatomic ions are held together with these kinds of bonds.....
Covalent bonds!