Biology
This is the process in which individuals with favourable characteristics survive and reproduce more successfully.
What is natural selection?
According to the solubility rules, this term describes sodium nitrate, NaNO₃, in water.
What is soluble?
This space technology helps people determine their location and navigate to a destination.
What is GPS?
This law states that acceleration increases with net force but decreases as mass increases.
What is Newton’s second law?
This variable belongs on the x-axis of a scientific graph.
What is the independent variable?
Drought, disease, predators and antibiotics are examples of this environmental factor that affects survival.
What is a selection pressure?
This insoluble solid forms when silver nitrate solution and sodium chloride solution are mixed.
What is silver chloride, AgCl?
This type of satellite monitors clouds, storms and cyclones to help scientists predict dangerous weather.
What is a weather satellite?
This is the acceleration of a 5 kg trolley experiencing a net force of 20 N.
What is 4 m/s²?
Calculation: a=F/m=20/5=4 m/s2
This variable belongs on the y-axis of a scientific graph.
What is the dependent variable?
Differences in characteristics such as colour, size or disease resistance among individuals in a population are described by this term.
What is variation?
This coefficient must be placed before KI to balance the equation:
Pb(NO₃)₂(aq) + _KI(aq) → PbI₂(s) + KNO₃(aq)
What is 2?
The balanced equation is:
Pb(NO₃)₂(aq) + 2KI(aq) → PbI₂(s) + 2KNO₃(aq)
his space technology can provide internet access to remote communities without fibre-optic cables.
What are communication satellites?
This is the net force acting on a 12 kg object accelerating at 3 m/s².
What is 36 N?
Calculation: F=ma=12×3=36 N
This graph should be used to show the relationship between ramp height and trolley acceleration.
What is a scatter graph with a line of best fit?
After trees become darker from pollution, dark moths are better camouflaged than pale moths. This explains why dark moths may produce more offspring.
What is greater reproductive success?
These two ions are the spectator ions in the reaction:
Pb(NO₃)₂(aq) + 2KI(aq) → PbI₂(s) + 2KNO₃(aq)
What are K⁺(aq) and NO₃⁻(aq)?
Evidence such as redshift and cosmic microwave background radiation supports this explanation for the origin and evolution of the universe.
What is the Big Bang theory?
When the same force acts on a 2 kg trolley and a 4 kg trolley, this trolley has twice the acceleration.
What is the 2 kg trolley?
Repeating each trial several times and calculating this value would improve reliability.
What is the average?
During a drought, only large, hard seeds remain. Birds with this beak characteristic are more likely to obtain food, survive and reproduce.
What is a large or strong beak?
This is the net ionic equation for the formation of lead(II) iodide.
What is Pb²⁺(aq) + 2I⁻(aq) → PbI₂(s)?
Radiation, limited oxygen, scarce liquid water and extreme temperatures are challenges humans would face while living in this location.
What is Mars?
A rocket pushes exhaust gases downward with 50,000 N. This equal and opposite force acts on the rocket.
What is an upward force of 50,000 N from the exhaust gases?
In an investigation of how concentration affects reaction rate, this is the independent variable.
What is the concentration of the reactant?