Reactivity
Sound and space
Genes
Electricity
100
Which is the most reactive metal in the reactivity series.
Potassium (K)
100
What is a peak?
It's the amplitude from zero to the top of the graph.
100
The nucleus of every cell contains threads called....
Chromosomes.
Chromosomes carry DNA in cells. DNA is responsible for building and maintaining your human structure. Genes are segments of your DNA.
100
How do you measure voltage?
Using a voltmeter.
200
How can you make salts?
Metal + acid - > salt + hydrogen
200
What instrument do we use to measure waveforms?
An oscilloscope.
200
A gamete is...
A sperm cell or an egg cell.
200
The source of energy in a circuit is called...
A supply.
300
What happens when you place a clean iron nail in a beaker containing copper sulfate?
The blue copper sulfate solution changes to a paler color. The iron also changes color - it becomes copper colored. This is the foundation of a reaction called....?
300
Explain interference.
It's the effect produced when the waves meet each other.
300
TRUE OR FALSE:
All sperm cells contain an X chromosome.
FALSE.
Half of all sperm cells contain an X chromosome, and half contain a Y chromosome.
300
What is resistance?
Resistance is a measure of how easy or difficult it is for electrons to move through a material.
Example: Conductors, such as copper, have very low resistance.
400
Zinc + hydrochloric acid ->?????
- > zinc chloride + hydrogen
400
Which is the easiest nebula to see in the other hemisphere?
The Orion Nebula
400
Explain variation using scientific terms.
Differences between individuals belonging to the same species.
400
Ohm's law.
voltage = current x resistance
500
What is limestone made of?
Calcium carbonate.
500
What is the role of magnetic crystals in finding evidence for tectonic plates? (alignment)
Magnetic crystals in molten rocks line up to the point north in the same way as a compass needle (today the compass points to north, but it wasn't the same 700.000 years ago! Earth's magnetic poles have swapped position multiple times). When the rock solidifies, scientists can use these crystals to tell the direction of Earth's magnetic field at the time when the rock become solid. The direction that the crystals are pointing is called ALIGNMENT.
500
Use the example of peppered moths to explain the phenomenon of natural selection.
The peppered moth demonstrates natural selection through color variation. Before the Industrial Revolution, light-colored moths were common as they blended with lichen-covered trees, avoiding predators. As pollution darkened tree bark, darker moths had a survival advantage, while lighter ones were eaten more. Over time, the population shifted toward darker moths. This change illustrates how environmental pressures favor certain traits, leading to evolutionary adaptation.
500
What is a fixed resistor? Draw the circuit symbol.
A variable resistor is a component used to change resistance. The circuit symbol of a variable resistor is: