WorksheetsChemical Equations
Total questions: 10
Worksheet time: 15mins
Element or Compound?
H2
H2O
Zn
O2
Fe
CBr4
SiO2
CO2
The elements in a formula are identified by their (a) .
Lowercase letters are (a) part of a 2-letter symbol.
Chemical formulas describe the number of (a) of each element in the substance.
2Al + 6HCl2 ---> AlCl3 + 3H2
How many different elements are taking part in the chemical reaction shown above?
(a)
2Al + 6HCl2 ---> AlCl3 + 3H2
How many atoms are represented in the reactants of the chemical equation that has been written above?
3
10
30
20
2Al + 6HCl2 ---> AlCl3 + 3H2
The products shown in the chemical reaction above would best be classified as –
Two elements
An element and a compound
Two compounds
A compound and a mixture
2Al + 6HCl2 ---> AlCl3 + 3H2
The reactants shown in the chemical reaction above would best be classified as –
Two elements
An element and a compound
Two compounds
A compound and a mixture
Element or Compound?
Na
Cl
NaCl
He
Zn
Fe2O3
SF6
Al2S3
In a chemical formula, the large number in front is called the (a) , and the small numbers at the bottom are called (b) .
