Respiration and Air Pollution
What is the term for the process by which living things obtain energy from the food they eat
Respiration
World Health Organization defines this as conditions and practices that help to maintain health and prevent the spread of diseases.
Hygiene
Give one example of a simple machine OTHER than a lever
Pulley, Inclined Plane, Wedge, Screw, Wheel and Axle, Gear
What two conditions are needed for rusting to occur?
If substance A has a pH of 12 and substance B has a pH of 2. Which is an acid and which is a base?
A is a base and B is an acid
What are the two types of respiration
Aerobic and Anaerobic
A thin sticky layer form over our teeth due to food remains.
Plaque
Three classes of levers are
First, Second and Third
The process by which metals react to form their oxides. Rusting is an example of this process
Corrosion
Which substance feels slippery to touch? Acids or Bases?
Burning fuels in a limited supply of air is known as
Incomplete Combustion
Wingless insects that live in head or pubic hair of humans
Lice
What is the equation for mechanical advantage?
Load / Effort
What are the two types of plastics
Thermoplastics and Thermosetting Plastics
What gas is produced when an acid reacts with a metal?
Hydrogen gas
Substances that can cause lung cancer when inhaled are called
Carsinogens
A microorganism that lives on, or in, and feeds on another living organism
Parasite
What three things do levers have in common?
Pivot (Fulcrum), Load and Effort
Brass is an alloy of which two metals?
Copper and Zinc
When an acid reacts with a base, what type of reaction is it termed as?
Neutralization Reaction
This accumulates in the lungs and destroys the alveoli causing emphysema
Tar
Sewage is flushed into an underground pit called
A Septic Tank
What property of a machine is the ratio between the useful energy output and the total energy input
Efficiency
Plastics are polymers formed from smaller molecules called
monomers
What three products are made when hydrochloric acid is reacted with sodium carbonate?
Sodium Chloride, Carbon Dioxide and Water