Chemical Changes II

Chemical changes involves the ____________ of atoms such that _______ is ___________.

• rearrangement, mass, conserved

• mass, rearrangement, conserved

• conservation, mass, rearranged

• mass, conservation, rearranged

What is the colour of universal indicator for strong acids (e.g., concentrated hydrochloric acid)?

• Blue

• Green

• Orange

• Red

What is the colour of universal indicator for strong alkalis (e.g., concentrated sodium hydroxide)?

• Blue

• Purple/Violet

• Orange

• Red

What is the colour of universal indicator for neutral substances (e.g., pure water)?

• Blue

• Green

• Orange

• Red

Name a chemical change that involves heat

Name a chemical change that involves light

Name a chemical change that involves oxygen

Name a chemical reaction that involves electric current.

Name a chemical reaction that involves mixing of substances.

Name a beneficial chemical change.