conservation of mass
A chemical substance that is present at the start of a chemical reaction
what is a reactant
water
what is H2O?
each horizontal row on the periodic table represents
what is a period?
HNO3
what is 63.02?
list physical changes when making a pizza
flattening the dough and putting on the sauce
A number in a formula written lower and smaller than the symbol to indicate the number of atoms of an element in a molecule
what is a subscript
carbon dioxide
what is CO2?
each vertical column on the periodic table is called
what is groups?
KCl
what is 74.55?
what is a chemical change?
indicates the relative number of atoms of each kind in a chemical compound
what is a chemical formula
sucrose
what is C12H22O11?
group number of helium and neon
what is group 18?
BaCO3
what is 197.34?
cooking an egg
what is a chemical change?
a way to describe a chemical reaction using chemical formulas and other symbols
what is a chemical equation
what is NaCl?
group 17 name
what is halogens?
LiCl
what is 42.39?
chopping wood
what is a physical change?
the new substances that are formed in a chemical reaction; to the right of the yield sign
what is a product
oxygen
what is O2
nickel, copper and gold all belong in the
what are transition metals?
NaOH
what is 40?
breaking glass