Atoms & Matter
What are the 3 main parts of an atom?
Protons, neutrons, electrons
Ice melting is an example of what kind of change?
Physical change
A shiny appearance is called what property of metals?
Luster
In the reaction C + O₂ → CO₂, what is the product?
Carbon dioxide (CO₂)
The number of protons in an atom determines what?
The element
Burning wood is an example of what kind of change?
Chemical change
Silver tarnishing in air is an example of what kind of property?
Chemical property
What law says matter cannot be created or destroyed in a reaction?
Law of Conservation of Mass
Which subatomic particles are found in the nucleus?
Protons and neutrons
Which of these is evidence that a chemical change occurred? A) water boiling, B) iron rusting?
Iron rusting
Density is a physical property. What is the formula for density?
Density = Mass ÷ Volume
Which equation shows exactly 10 oxygen atoms on the reactant side?
A.) 2H₂ + O₂ → 2H₂O,
B.) C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
B. C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
The chemical formula for aspirin is C₉H₈O₄. How many atoms total are in one molecule?
✅ Answer: 21 atoms
When yeast is added to hydrogen peroxide and bubbles form, what gas is being produced?
Oxygen (O₂)
Which property describes how well a substance lets heat or electricity pass through it?
✅ Answer: Conduction
Which best shows cohesion and adhesion?
A. Droplets on waxy leaf & water sticking to towel
B. Water running off a leaf, and water evaporating into the air
✅ Answer: Droplets on waxy leaf (cohesion) & water sticking to towel (adhesion)