physical science PS.3 - Properties of Matter

Name the 4 states of matter

solid, liquid, gas, plasma

What are these examples of?

* melting/boiling point
* temperature
* color
* state
* texture
* odor

physical properties

What is a pure substance?

matter that contains only one type of atom

What are these examples of?

* reactivity
* acidity/basicity
* flammability

chemical properties

True/false:

New substances are created during a physical change

false

True/false:

Matter can change states during physical changes

true

Is salt dissolving a physical or chemical change?

physical change

True/false:

Ruse forming is a physical change

false

Do chemical changes create (at least one) new substance(s)?

yes

Exothermic OR endothermic:

more total energy is required to break bonds in the substance than the total energy is released when new bonds are formed

endothermic

Exothermic OR endothermic:

less energy is required to break bonds than the amount of energy that is released when new bonds are created

exothermic

Is cooking an example of a chemical change or a physical change?

chemical

Define “elements”

they are a pure substance containing only one type of atom

Define “compounds”

pure substances that contain at least two types of atoms that are chemically combined by fixed ratios

Define “mixture”

when two or more different substances that are **not** chemically combined

Define “solution”

when one substance (the solute) dissolves evenly into another substance (the solvent)

Solvents are usually a ___

liquid

what can compounds be classified as?

ionic or covalent

What is it called when a metallic element reacts with a nonmetallic element?

ionic bonds are formed

What is it called when two nonmetals react?

covalent molecular bonds are formed

How do atoms become chemically stable?

Atoms lose, gain, or share electrons to have a completely filled outer shell (valence level)

What do chemical formulas show?

The number of atoms that each element has that form compounds

What do chemical equations show?

The changes that happen during a chemical reaction

What does the law of conservation of matter say?

That even if a substance goes through chemical or physical changes, the total mass remains the same