Identify the number of elements on the periodic table.
118
AB -> A + B is what type of reaction
Decomposition
HCL is a chemical formula for?
hydrochloric acid
Classify this type of reaction:
N2 (g) + H2O (g) + O2 (g) → NH4NO3 (s)
Synthesis or combination
A positively charges particle in the atomic nucleus. its mass is approximately 1 atomic unit.
proton
Identify the family name given to the elements of group 8.
nobel gases
When burning magnesium, it combines with oxygen to form what compound?
2 Mg(s) + O2(g) → 2 MgO(s)
magnesium oxide
Zn+S→ZnS
convert this to a worded equation.
zinc+sulfur→zinc sulfide
products of Acid-Base Reactions
salt and water
true or false protons have a similar mass to neutrons and hold a positive charge.
true
what position on the periodic table is phosphorous
period 3 group 5
rust is the product of what reaction?
corrosion or oxidation
Fe2O3 what is this a chemical formula for?
iron oxide
The process of transforming a dissolved substance into an insoluble solid.
Formation of a separable solid substance from a solution
precipitation reaction
what is the difference between a molecule and compound?
what is the chemical element for lead?
pb
Neutralisation is the reaction between a _____ and a _____
acid, base
Balance this equation
___ SnO₂ + ___ H₂ → ___ Sn + ___ H₂O
SnO₂ + 2 H₂ → Sn + 2 H₂O
What is the type of reaction for this chemical reaction:
AgNO₃ (aq) + NaCl (aq) → AgCl (s) + NaNO₃ (aq)
Double displacement & precipitation
double points for both
what are covalent bonds.
Covalent bonding is the sharing of electrons between atoms.
element with atomic number 40
zirconium
Zinc(s) + oxygen(g) -> zinc oxide(s)
Do the mass of the reactants on a crucible = products
No, heavier after
balance this equation ___ P4 + ___H2 ---> ___PH3
1P4+6H2---->4PH3
What do the products of a combustion reaction always include?
CO2 and H2O
how many electrons does magnesium have in its outer shell?
3 (altogether it has 12 electrons -> 2 in the first, 8 in the 2nd and 3 in the 3rd)true