Chemical Reactions
What do you call a solid that forms when two liquids react?
Precipitate
What is the energy of motion called?
Kinetic energy
Which law says an object in motion stays in motion unless acted on by an outside force?
Newton’s First Law
What is the formula for speed?
Speed = distance / time
What is a substance made of two or more elements chemically combined?
Compound
What are the substances present before a chemical reaction called?
Reactants
What type of energy does food contain?
Chemical potential energy
What is the formula for force?
F = ma
A car goes 150 km in 3 hours. What is its speed? (Need correct units for correct answer!)
50 km/h
Give an example of a chemical property.
Reacts with acid, flammable
How can you tell a chemical change has occurred? (Give at least 2 signs)
Color change, temperature change, precipitate formation
A roller coaster has the most potential energy at what point?
The top of the hill
A truck and a bike are pushed with the same force. Which accelerates more and why?
The bike, because it has less mass
What’s the main difference between speed and velocity?
Velocity includes direction
What is CO2?
Compound/molecule
In the reaction 2H₂ + O₂ → 2H₂O, how many molecules of water are formed?
2
What energy transformation occurs when you eat food and go for a run?
Chemical energy to mechanical energy
Why do we lean backward when a bus moves forward suddenly?
Inertia, Newton’s First Law
A runner speeds up from 2 m/s to 6 m/s in 2 seconds. What is their acceleration? (Must have correct units!)
2 m/s²
This type of change doesn’t make a new substance.
Physical
What is this describing: mass is conserved; the total mass of reactants equals the total mass of products.
Law of Conservation of Mass
Describe how mechanical energy includes both kinetic and potential energy.
Mechanical energy is the total of an object's kinetic and potential energy
What is this referring to: For every action there is an equal and opposite reaction, e.g., balloon flying when air is released?
Newton's Third Law
What is happening to the motion of an object if its velocity is changing but speed stays the same?
Changing direction
Ca(NO₃)₂ contains how many atoms total?
9