Lights! Camera! Action!
What is light best described as in chemistry? (Hint 2 different things)
a wave and a particle
What's the difference between an ionic bond and a covalent bond?
When you decrease temperature (heat), what happens to entropy?
It decreases
___________________ is the property of water that causes water molecules to “stick” to other substances. Ex. Glass of water sweats and sticks to a coaster
Adhesion
What causes the circular motion of water as it boils?
Convection
What is a photon?
A packet of light energy
What are two properties of ionic compounds
- Dissolves in water
- Conducts electricity
Explain why thermal expansion happen.
Thermal expansion is caused by an increase in temperature which causes the particles to not only move faster, but also move farther away from one another.
__________describes how water moves against gravity and can travel up a plant’s roots into its stem and leaves.
Capillary action
What is the process called when a metal spoon placed in hot water heats up?
What are energy levels?
Energy levels are specific levels around the nucleus where electrons live
Rubber, plastic
Thermal energy is a type of _______ energy
kinetic
Water is called the ______________ ________________ because of its ability to dissolve so many different substances.
universal solvent
What type of heat transfer occurs when heat is given off by light?
Radiation
Before an atom that is in its ground state can give off (emit) light in the form of a photon, what must happen first?
The electron needs to first absorb energy and move to a higher energy level, then it will release that excess energy as a photon and drop back to its ground state.
What is the distinguishing factor between a conductor and insulator? (I'm not asking why they're different?)
How well electrons are able to move through the material
A block of aluminum weighing 140 g is cooled from 98.4°C to 62.2°C with the release of 1080 joules of heat. From this data, calculate the specific heat of aluminum.
0.213 J/g °C
Ice floats on water because:
Ice is less dense
Surface tension
How much heat is needed to raise the temperature of 10.0 g of aluminum from 22°C to 55°C, if the specific heat of aluminum is 0.90 J/g °C
297 J
According to the Law of Conservation of Energy, what kind of relationship does the energy an electron absorbs have with the the amount of energy the electron emits.
What is thermal conductivity?
What is the total amount of heat needed to change 2.25 kg of silver at 0.0°C to 200.0°C? heat of silver is 0.129 J/g∙°C
58,050 J
Capillary action of water in a tube is the result of _____ being stronger than _____.
Adhesion, cohesion
The specific heat(c) of copper is 0.39 J / g °C. What is the temperature change (∆T) when 100 Joules of heat is added to 20 grams of copper?
12.82 J