Chemical Changes

You can tell a chemical reaction because it always produces _________

• A different substance

• Reactants

• A change of state

• Water

Which one of the following represents a physical change _______

• Iron rusting

• Water burning

• Paper burning

• Dynamite exploding

What kind of chemical reaction is where one substance is broken down into two substances?

• Photosynthesis

• Combustion

• Synthesis reaction

• Decomposition reaction

To balance a chemical equation, you should change only the __________

• Location of the narrow

• Chemical formulas

• Subscripts

• Coefficients

In the following are types of chemical change, interaction between matter and oxygen ____

• Oxidation and combustion

• Synthesis and oxidation

• Decomposition and photosynthesis

• Decomposition and combustion

Combustion of sulfur occurs in power stations and factory, which one on the following is called pollutant _____

• Sulfur

• Sulfur dioxide

• Oxygen

• Dihydrogen oxide

What is electrolysis _______

• Chemical decomposition of substances with light

• Chemical synthesis of substances with light.

• chemical decomposition of substances with an electric current

• Chemical synthesis of substances with an electric current

Decorative pattern can be carved onto metal objects using technique called ______

• Electroplating

• Electrolysis

• Acid etching

• Carbonates

On the following are indacators, except ____

• Litmus paper

• Universal indicator

• Purple cabbage solution

• Neutral solution

Harmful effect of chemical changes in burning, except _____

• Acid rain

• Air pollutants

• Iron rust

• Particulate material