Energy & Matter
Give 2 examples of a chemical property.
Flammability, ability to rust/reactivity with oxygen
When baking soda and vinegar fizz, is that a physical or chemical change?
Chemical change
Why are aerosol cans labeled “Do not expose to heat”?
Heat increases pressure inside the can, which can make it burst/explode
What is an ion?
An atom or group of atoms with a charge because it gained or lost electrons
Which tool should you use to measure 10 mL of vinegar?
Graduated cylinder
What is the difference between physical and chemical properties of matter?
Physical properties can be observed without changing the substance; chemical properties describe how a substance can form a new substance
If a glass cup shatters, is that a physical or chemical change?
Physical change
In Boyle’s Law, which variable stays constant?
Temperature
Isotopes have the same number of what: protons, neutrons, or electrons?
Protons
What is the difference between ionic and covalent bonds?
Ionic = electrons transferred; covalent = electrons shared
How does heat from the sun reach Earth?
Radiation
If a penny oxidizes and turns green, is that a physical or chemical change?
Chemical change
Compare how molecules move in a liquid and in a gas.
Liquid: close together and slide past each other; gas: far apart and move freely/quickly
What does valence electrons mean?
Electrons in the outermost energy level
What does the Law of Conservation of Mass state?
Matter is not created or destroyed
What is radiation and how does it travel?
Heat transfer by electromagnetic waves; it can travel through empty space
Is solubility a physical or chemical property?
Physical
In air, which is 78% nitrogen and 21% oxygen, which is the solvent?
Nitrogen
What charges do protons, neutrons, and electrons have?
Proton = positive, neutron = neutral, electron = negative
What side of a chemical equation are the reactants on?
Left side
What is the difference between conduction and convection?
Conduction = direct contact; convection = movement of liquids/gases
Is describing the state of matter a physical or chemical property?
Physical
What is solubility?
The amount of solute that can dissolve in a solvent
What is the atomic number?
The number of protons
When balancing chemical equations, what can you modify?
Coefficients only