Chemical substances

All matter is made up of very small particles called

• Element

• Atom

• Molecule

• Solid

A pure substance made up of same kind of atoms called

• Element

• Molecule

• Mixture

• Compound

Chemical symbol for potassium is

• Br

• Mg

• K

• Cl

Chemical symbol for silver is

• Au

• Na

• Ag

• Cu

Which of the following shows correct charges on elements

Copper , chloride , Zn, Aluminium

• +2, -1 , +3, -1

• +2, -2,+3,-1

• +2,-1,+2,+3

• +1,-2,+3,-1

Chemical formula of calcium chloride is

• Cucl2

• Cacl2

• Zncl2

• Cacl

Blowing balloon is a

• Physical change

• Chemical change

• Both

• None of these

A chemical reaction in which one substance displaces another substance called

• Combination reaction

• Decomposition reaction

• Displacement reaction

• Neutralization reaction

CuSo4 solution has colour

• Pink

• Orange

• Blue

• Green

A chemical reaction in which new substances formed called

• Equation

• Reactant

• Product

• Element