Biological Systems
Name at least two of the four functions of the skeletal system.
support of the body
protection of vital organs
movement
storage of minerals (like calcium) and blood cells
Which measurement is always involved in an experiment around rates of reaction?
Time
What is the term used to describe atoms that have lost or gained electrons?
Ion
What is the unit for moment?
Nm
Which state of matter is least dense?
Gas
What is the name of the structure that connects bone to muscle?
Tendon
What is 'concentration'?
Number of particles in a given volume
Which charge do alkali metals have when they form an ion?
positive (+1)
What is the equation to calculate moment?
Moment = Force x distance
What is the unit for density?
g/cm3
kg/m3
What is the term used to describe two muscles working together?
Antagonistic pair
Name four factors that affect the rate of reaction.
concentration
surface area
temperature
catalyst
What is formed when an acid reacts with a metal?
salt and hydrogen
A lever consists of which three things?
Pivot, load and effort
What is the human hearing range?
20 to 20,000Hz
What are the reactants and products of anaerobic respiration.
Reactant: glucose
Product: lactic acid
How does a catalyst speed up the rate of reaction?
It lowers the activation energy
What is the name of the salt when calcium reacts with nitric acid?
Calcium nitrate
Name at least three simple machines.
Levers
Wheels / Gears
Axels
Pulleys
Screws
Wedges
What is the equation to calculate pressure?
Pressure = Force / area
What is the term used to describe different versions of the same gene?
allele
Give an example of an endothermic reaction
Photosynthesis
Thermal decomposition
Which element is typically used during a displacement reaction?
Carbon
What is the unit for the spring constant?
A microphone converts a __________ into an __________ .
A microphone converts a sound wave into an electrical current.