Chapter 2 Physical Science Review
The mass of a 20 L sample of gas with a density of 0.04 mg/L is . . .
0.8 mg
How many hydrogen atoms are in a particle of sulfuric acid, H2SO4?
2
How many atoms are in a single molecule of Fe2O3
5
Which of the following is not a physical property of iron?
ability to rust
The smallest unit of an element that maintains the properties of that element is a(n) . . .
atom
Which of the following is not a potential sign of chemical change?
boiling
A change in color during a reaction is often a sign that a(n)_________change has occurred.
chemical
Aluminum, oxygen, and carbon are each . . .
elements
Which of the following is not a potential sign of chemical change?
evaporation of water
Which tool is best for separating a mixture of sand and water?
filter
Which of the following is not a pure substance?
mixture
A chemical change occurs whenever . . .
new substances form
Is crumpling a sheet of paper a physical of chemical change? Why?
physical because the paper is still paper and just changed shape
A chemical property of copper is its . . .
reactivity
Which of the following is not an example of a physical property?
reactivity
Which property of a substance is not affected by physical changes?
reactivity
Which of the following is an example of a chemical property?
reactivity with oxygen
What is the name of: Fe2O3
rust
Name the two types of pure substances.
silver and gold
What is the name of: C12H22O11
table sugar
The density of ________ is 1.00 g/cm cubed
water
Two or more liquids that can dissolve into each other are referred to as . . .
miscible
The components of a(n)___________can be separated because they are not chemically combined.
mixture
Flammability is a chemical property that tells whether a substance reacts in the presence of . . .
oxygen
The chemical element that is most abundant in the human body is . . .
oxygen
The chemical formula for water, H2O, means that each water molecule contains . . .
two hydrogen atoms and one oxygen atom
What is the name of: H2O
water
Each molecule of iron oxide (Fe2O3) contains_________ iron atom(s).
2
One molecule of hydrochloric acid (HCl) contains________atom(s)
2
Lead has a density of 11.3 g/cm cubed and a mass of 282.5 g. What is its volume?
25 cm cubed
Matter is defined as anything that . . .
has mass and takes up space
A substance has a mass of 360 g and a volume of 7.5 mL. What is its density?
48 g/mL
The chemical symbol for sulfuric acid is H2SO4, How many atoms are contained in each molecule of sulfuric acid?
7
Unlike a mixture, a pure substance has . . .
a fixed composition
A material that can be represented by a chemical formula is . . .
a pure substance
What is the density of a sample of liquid that has a volume of 125 mL and a mass of 200 g?
1.6 g/mL
The chemical formula for table sugar is C12H22O11. How many oxygen atoms are in each sugar molecule?
11
What is the name of: Cu
copper
Which of the following results in a mixture?
dissolving salt
Diamond is known for its . . .
hardness
You put 1 spoonful of salt into 1 liter of water and stir. The resulting liquid is an example of a(n) . . .
homogeneous mixture
Define chemical change.
When 2 different substances are changed into a new substance with different properties than the original substances
An object's volume can be found by dividing its mass by its . . .
density
The _________of a substance is defined as its mass divided by its volume.
density
Which of the following is a physical change?
dissolving, evaporating, and bending
Which of the following is an element?
iron
The different substances in a mixture . . .
keep their properties
Helium is used in balloons because it is . . .
lighter than air
A group of atoms that acts as a unit is called a(n) . . .
molecule
The chemical symbol O stands for the element . . .
oxygen
Which of the following causes a chemical change?
burning
Digesting food is an example of . . .
chemical change
A molecule of water (H20) is made from ______ combining two hydrogen atoms and one oxygen atom.
chemically
The science of what matter is made of and how it changes is called . . .
chemistry
A chemical change is a change in the_________of a substance.
composition
A substance that is made of atoms of more than one type chemically bound together is called a(n) . . .
compound
Copper is used to make electric wire because it is a good . . .
conductor
How is the density of an object calculated?
d=m/v