Energy Changes
What form of energy is stored in a skater about to drop down the ramp?
Gravitational potential energy
Is melting ice a physical or chemical change?
Physical
True or false:
Energy cannot be created.
True
Which particle has a negative charge?
Electron
What piece of equipment is used to measure temperature?
Thermometer
What energy transformation occurs in a torch?
Chemical energy --> light energy
Name one sign that a chemical reaction has occurred.
Any of:
Colour change, gas produced, light produced, temperature change.
According to the Law of Conservation of Energy, energy can be:
a) Created and destroyed
b) Lost in a system
c) Transferred or transformed
c
Where are protons and neutrons found?
In the nucleus
What do we call results that are consistent when repeated?
Reliable
A saucepan is heated by touching a hot stove. What type of heat transfer occurs?
Conduction
When magnesium reacts with hydrochloric acid, bubbles are produced. Is this a physical or chemical change?
Chemical
What sort of system is a pot of boiling water without a lid?
What is atomic number equal to?
Number of protons
What do we call a result that is close to the true value?
Accurate
A camper feels the warmth of a campfire whilst sitting nearby. What type of heat transfer is this?
Radiation
How could you test for hydrogen?
The pop test.
Can matter or energy enter and leave a closed system?
Energy
Alloys are a ________ of metals and nonmetals.
Mixture
In an experiment testing the effects of light intensity of rate of photosynthesis, what is the DEPENDENT variable?
Rate of photosynthesis
A rollercoaster runs down and up a U-shaped track. When is kinetic energy highest?
At the bottom of the U.
A student burns steel wool, which creates iron oxide. The mass increases after the reaction. Why does this NOT break the Law of Conservation of Mass?
Oxygen from the air joined with the steel wool, increasing its mass.
Provide a valid example of a closed system.
Ms Bowyer to decide :)
What is the electron configuration of Magnesium?
2.8.2
A student wants to test whether magnesium or zinc is more reactive with acid. Identify a controlled variable for this experiment.
Any of:
Volume of acid, concentration of acid, temperature, mass of metal, equipment