Chemical Elements
"Au" stands for which period element?
gold
Chemical formula of carbon dioxide
CO2
What are the three states of matter?
Liquid, solid and gas
Is car getting rusty is a type of chemical or physical change?
Elements in the Periodic Table are listed in order of their ________.
atomic number
NaCl is also known as?
Table salt
What can cause a change of state?
increase or decrease in temperature
Can a chemical transformation be reversed?
no
What state of matter describes Mercury and Bromine?
liquid
Chemical formula of calcium dichloride?
CaCl2
What type of pH does a neutral substance have?
7
What kind of properties can only be observed when a substance changes into a different substance? (physical, chemical, liquid)
chemical
Elements of the periodic table can be divided into which three sub groups?
metals, non-metals, semi-metals (metalloids)
When an oxygen molecule and an oxygen atom collide, what does it form?
When heat is added to a substance, the molecules and atoms vibrate faster or slower?
faster
What causes an apple to turn brown? (type of chemical change)
oxidation
What scientist is usually credited with inventing the Periodic Table? Newton, Mendeleyev, Einstein or Nobel
Mendeleyev
What is the chemical formula of ozone?
O3
Which expand most upon heating: liquids, solids or gases?
gases (greater intermolecular space )
When solids become liquids and liquids become gases energy is (lost, gained, stays the same)
gained (energy is absorbed)