SURFACE FEATURES
What surface feature is formed by the accumulation of sediment at the mouth of a river?
A delta.
What happens to water when it freezes?
It changes from a liquid to a solid (ice).
What is a sign that a chemical change has occurred?
gas production, formation of a new substance.
What type of electricity is naturally occurring and can be seen in lightning?
Static electricity.
What is a permanent magnet?
A magnet that retains its magnetism over time.
Name one process that can cause mountains to form
Tectonic plate movement (collision or uplift).
Name a physical change that occurs when you mix sugar into water.
The sugar dissolves but does not change chemically.
Describe an investigation to determine if a substance has undergone a chemical change
Burning a piece of paper and observing the formation of ash, smoke, and heat.
Name the components needed to create a simple electric circuit.
A power source (battery), wires, and a load (light bulb or motor)
Describe how an electromagnet works.
It is created when electric current flows through a coil of wire wrapped around a metal core.
What is the term for the wearing away of rocks and soil by wind or water?
Erosion.
How does temperature change affect the state of water?
It causes water to change states—freezing when cooled, evaporating or boiling when heated.
What observable evidence might indicate that a gas has been produced during a chemical reaction?
Bubbles or fizzing, such as in vinegar and baking soda reactions.
What is the difference between conductors and insulators?
Conductors allow electricity to flow (e.g., metals), while insulators prevent it (e.g., rubber, plastic
What happens when a magnetic object is placed in a magnetic field?
It is either attracted, repelled, or experiences a force.
Describe a delta and how it is formed.
A delta is a landform created when a river deposits sediment as it flows into a larger body of water, such as an ocean or lake.
Describe an investigation to observe a physical change using common materials. ex. Ice cubes
Melting ice cubes and observing how they return to liquid form demonstrates a physical change.
What is the difference between a physical change and a chemical change?
A physical change alters appearance without changing composition, while a chemical change results in a new substance.
What is the purpose of a switch in an electric circuit?
A switch controls the flow of electricity by opening or closing the circuit.
What factors affect the strength of an electromagnet?
The number of coils, the strength of the electric current, and the type of core material.
How are sand dunes created?
Sand dunes are created by erosion and deposition as wind carries and deposits sand particles over time.
Provide an example of a physical change that does not involve a change in state.
Breaking a glass or tearing paper.
Why is rusting considered a chemical change?
Rusting involves a reaction between iron, oxygen, and water, forming a new substance (iron oxide) with different properties.
Explain how human-harnessed electricity is different from static electricity.
Static electricity is a buildup of charge, while current electricity flows continuously in a circuit.
How can you show that a magnetic field exists around a magnet?
By sprinkling iron filings around the magnet and observing the pattern they form.