1.The reaction C + O₂ CO₂ is an example of a _______________reaction

Metal + halogen -> halide 
b. Metal + oxygen -> metal oxide 
c. Metal + sulphur -> sulphide 
d. Non-metal + oxygen -> non-metal oxide 
2.Rust is an example of which type of reaction?

Metal + halogen -> halide 
b. Metal + oxygen -> metal oxide 
c. Metal + sulphur -> sulphide 
d. Non-metal + oxygen -> non-metal oxide 
3.All halogens are-------

. electronegative 
b. coefficient 
c. diatomic 
d. multivalent 
4.In 4(NH₃)₂SO₄ there are a total of ________atoms.

a. 25 
b. 37 
c. 21 
d. 52 
5.It is OK to modify a chemical formula to balance a chemical equation.??

6.In a synthesis reaction, metals tend to _________ electrons and non-metals tend to ________ electrons.

a. lose; gain 
b. gain; gain 
c. gain; lose 
d. lose; lose 
7.In 4(NH₄)₂SO₄ there are a total of ________atoms.

a. 25 
b. 35 
c. 45 
d. 60 
8.The balanced equation for sulphur (VI) oxide + water --> sulphuric acid is

SO₄ + H₂O -> 2H₂SO₄ 
b. SO₃ + H₂O -> H₂SO₄ 
c. 2SO₃ + 4H₂O -> 4H₂SO₄ 
d. SO₃ + 2H₂O -> H₂SO₄ 
9.The formula for gallium iodide is