Matter & Chemistry
Which state of matter has a fixed shape and fixed volume?
Solid
A student pushes a box with 15 N right while friction pushes 5 N left. What is the net force?
10 N right
What energy transformation occurs in a wind turbine?
Kinetic → electrical
What season occurs in the Northern Hemisphere when the North Pole tilts toward the Sun?
Summer
Which force always acts opposite motion and slows objects down?
Friction
A mixture where the parts are not evenly mixed and can be easily seen is called what?
Heterogeneous mixture
At terminal velocity, what are the forces acting on the skydiver?
Balanced forces
What type of energy does a stretched rubber band have?
Elastic potential energy
What alignment causes spring tides?
Sun, Moon, Earth in a straight line
When you choose to do something hard now to make life easier later
(like studying before scrolling, saving money instead of spending it, or going to bed on time),
you are using this powerful psychology skill that helps you reach long-term goals.
delayed gratification
self-control
Which observation is the strongest evidence of a chemical change?
Formation of a new substance (gas, precipitate, color change)
A car travels 45 m in 9 seconds. What is its speed?
5 m/s
If 75 J of 100 J becomes mechanical energy, where did the other 25 J go?
Converted to heat (thermal energy)
Salt dissolves slower when stirring is ________.
Decreased
How many atoms are in H₂SO₄?
7 total atoms
What is the difference between an element and a compound?
Elements have one type of atom; compounds have two or more chemically combined.
What is the key difference between speed and velocity?
Velocity includes direction, speed does not.
Heating a substance increases the ______ of its particles.
Kinetic energy
Which is the solvent in a saltwater solution?
Water
what you use when you feel overwhelmed, angry, or upset and choose to pause, breathe, or take space before reacting.
It’s the ability to manage your emotions so they don’t control your behavior.
Self-regulation
emotional regulation or managing your emotions
A scientist dilutes a solution by adding water. What happens to the concentration?
It decreases.
If all forces on an object are equal and opposite, what happens to its motion?
It continues at constant velocity (no acceleration).
Styrofoam keeps ice cold because it is a good:
Insulator
Which information is more useful for locating a missing hiker: speed or velocity?
Velocity (because it includes direction)
Which best describes convection?
Warm fluid rises, cool fluid sinks.