HEAT CURVE
What happens to temperature during a phase change in a heat curve?
It stays the same.
What is the formula for molarity?
M = moles / liters
What type of energy does the sun mostly give off?
Radiant energy (light)
Name one noble gas
Helium, Neon, Argon, etc.
What does kinetic energy mean?
Energy of motion.
On a heat curve, what phase change is occurring at the flat line between solid and liquid?
Melting (fusion)
What is the molarity of 2 moles of NaCl in 1 liter of water?
2 M
True or False: Radiant energy can travel through space.
True
Why are noble gases nonreactive?
They have full outer electron shells.
When molecules move faster, what happens to temperature?
It increases
What is the heat formula used to calculate temperature change (not during a phase change)?
q = mcΔT
If you have 0.5 moles of solute in 2 liters of solution, what is the molarity?
0.25 M
True or False: Gamma rays have more energy than ultraviolet and visible light.
True
Which noble gas has the smallest atomic radius?
Helium
What is chemical equilibrium?
When the forward and reverse reactions happen at the same rate.
What does "q" stand for in the equation q = mcΔT?
Heat energy
How many moles are in 3 L of a 2 M solution?
6 moles
What happens to atoms when they absorb radiant energy?
Electrons get excited or move to higher energy levels.
Which noble gas has the highest atomic number?
Radon
What happens to a system at equilibrium when you add more reactant?
The system shifts to the right (makes more products).
If a substance is boiling, what type of energy is being added without changing the temperature?
Potential energy
What volume (in L) of 1.5 M solution contains 3 moles of solute?
2 L
What happens when an excited electron returns to its ground state?
It releases energy as light.
Why don’t noble gases form bonds easily?
They are already stable and don’t need electrons.
According to Le Chatelier’s Principle, what happens if pressure is increased in a gas reaction?
The system shifts to the side with fewer gas particles.