Vocabulary & Definitions
What is Matter?
Anything that has mass and takes up space
Is color a physical or chemical property?
physical
Is melting ice a physical or chemical change?
Physical
What tool measures mass?
Balance scale
What’s the formula for density?
D=m/v
What is a Physical Property?
A property that can be observed without changing the substance’s identity
is flammability a physical or chemical property?
chemical
Is burning wood a physical or chemical change?
Chemical
What tool measures liquid volume?
Graduated cylinder
What’s the Law of conservation of mass
Matter cannot be created or destroyed; total mass of reactants = products.
Define Reactivity
How a substance reacts with other materials
Name 2 physical properties and 2 chemical properties
Physical properties: color, density, melting point, solubility, malleability, or conductivity.
Chemical properties: flammability, reactivity, oxidation (rusting), or ability to react with oxygen/acids/bases.
Name 3 signs that a chemical change has occurred
Color change, gas production, temperature/light change, precipitate, odor change.
What’s the unit for length in the metric system?
cm or mm
Why is density considered an intensive property?
it doesn’t depend on how much of the substance you have
What does malleability mean?
Ability to be hammered or shaped
What property describes a metal’s ability to conduct heat or electricity
Conductivity
Explain why iron rusting is a chemical change
it reacts with oxygen and forms a new substance
How do you find the volume of an irregular solid?
Use water displacement
If an object has a mass of 20 g and a volume of 4 mL, what’s its density?
5 g/ml
What is an intensive property? give an example
a property that does not depend on amount, like density, color, temperature, melting point, or hardness
Which property describes a metal’s ability to be drawn into a wire?
ductility
Give one example of a change that might look chemical but is actually physical.
Dissolving sugar into water - no new substance
Why must you subtract the mass of an empty container when measuring a liquid’s mass?
So you only get the liquid’s mass, not the container’s too
During a chemical reaction, 50 g of reactants form 50 g of products. What law does this demonstrate?
law of conservation of mass