Changes of Matter in the presence or absence of oxygen: Propert

Oxygen is very ______ gas.

• attractive
• reactive
• abundant
• unused

Triangle of fire includes Heat, Oxygen and _______.

• Rust
• Flame
• Fuel
• Fire

Combustion is also known as _____.

• Spark
• Burning
• Electricity
• Explosion

Formed when iron and oxygen react with water or air moisture.

• Combustion
• Rusting
• Fire
• Oxidation

this is the process of any chemical reaction that involves the moving of electrons.

• Reactive Process
• Electolytes
• Oxidation
• Apple process

What will happen if the apple will be left expose with air?

• It will become black
• It will be smelly
• It will stay the same
• *It will turns brown

Reaction or process accompanied by the replace of heat

• Energy
• Combustion
• Heat
• Chemical Bond

Apple turns brown when cut due to the exposure in_____.

• Nitrogen
• Oxygen
• Carbon Dioxide
• Carbin Monoxide

Rust is a substance called

• Ferrous Monoxide
• Ferrous Oxide
• Ferrous
• Ferrous Sulfate

Why the apple soaked in water with vitamin C does not turn brown?

• because vitamin C is an antioxidant
• because it has oxygen
• becausenit has carbon dioxide
• because vitamin C changes the color