Unit 2 Flashcards
Glass Breaking
Physical
Reacts with water
Chemical
Dissovles in Acotne
Physical
is blue
Physical
does not react with hydrogen
Chemical
They show how many atoms of each element are in a unit of a substance
Chemical Formula
physical property/chemical property
A physical property can be observed without changing the identity of the matter. A chemical property can be observed only when a chemical change might occur that would change the matter into something new.
Which properties of a substance is affected by physical changes?
Shape,Size,Color,Position
When elements form compounds, the elements
react to form a new substance with new properties.
What is the mass of a bar of gold that measures 15cm×8cm×4cm and has a density of 19.32 g/cm3?
24.84 g
which of the following statements about density is TRUE?
Density is a chemical property.
What can describe an element
They have unique sets of properties.
All the particles are alike
They can join together to form compounds.
What is the density of a substance that has a mass of 5 g and a volume of 40 cm3?
0.125g/cm3
A lead ball has a mass of 454 g. The density of lead is 11.35 g/cm . What is the ball’s volume?
40 cm3
What is some physical properties of matter
ductility,thermal conductivity,color
Being able to burn wood is an example of wood’s
Chemical Property
Two substances that undergo a chemical change together are ____ with one another
reactive
Dissolving salt in water demonstrates
solubility,Physical Change
How is a mixture different from a compound?
Each substance in a mixture keeps most of its characteristic properties.
Which of the following results in a mixture?
dissolving salt
The mass of a 20 L sample of gas with a density of 0.04 mg/L is
0.8 mg.
Color, odor, mass, and volume are ____ of an object.
physical properties
You have 20 mL of liquid mercury. Liquid mercury has a density of 13.55 g/cm . What is the mass of the
mercury sample?
271g
You accidentally break your pencil in half. This is an example of
a physical change.
The melting of butter when it is left out in a warm room is an example of
a physical change.
A pure substance made of two or more elements that are chemically combined is called a
compound
A pure substance must be either a(n) ____________________ or a(n) ____________________.
element,compound
_____is the ability to transfer thermal energy from one area to another and is a physical property of matter.
thermal conductivity
Some objects float on fluids because of ____________________, the mass per unit volume of an object.
density
____________________ is the ability to burn.
Flammability
Cheese melting on a hamburger is an example of a ____________________ change.
Physical
Whether helium is in a large airship or in a small balloon floating right beside it, helium’s ____________________ will be the same.
density
When mixtures are not completely mixed they are ___________
heterorgenues
When mixtures mix well they are considered __________
miscible
The ability of a substance to be pounded into thin sheets is ____________________.
malleability
The ability of a substance to dissolve in another substance is ____________________.
solubility
