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WorksheetsUnit Two (Relationships) Review
Total questions: 49
Worksheet time: 2hrs 38mins
Most things that contain _______ are considered to be organic.
Oxygen
Carbon
Nitrogen
What type of compound is salt?
Molecular
Ionic
What are the reactants in the neutralization reaction? (2 answers)
acid
water
base
salt
What is the formula for table salt?
(a)
What is the name of this type of reaction?
neutralization
decomposition
What is produced by the neutralization of an acid by a base?
sugar and oxygen
water and a salt
What type of ions are produced when an ACID is dissolved in water and what symbol do we use to show it?
Hydrogen (H+)
Hydroxide (OH-)
What type of ions are produced when a BASE is dissolved in water and what symbol do we use to show it?
Hydrogen (H+)
Hydroxide (OH-)
An unknown substance has a pH of 2. It is:
an acid
a base
a neutral substance
An unknown substance has a pH of 10. It is:
an acid
a base
a neutral substance
An unknown substance has a pH of 7. It is:
an acid
a base
a neutral substance
Which type of bond SHARES valence electrons?
ionic
covalent
Which type of bond TRANSFERS valence electrons?
ionic
covalent
When an atom loses or gains electrons, it becomes an-
egon
ion
What type of compounds are created by covalent bonds?
ionic
molecular
Examples of molecular compounds:
water
oil
methane
Table Salt
LiF (Lithium Flouride)
Examples of ionic compounds:
water
oil
LiF (Lithium Flouride)
Table Salt
MgO (Magnesium Oxide)
Properties of Ionic Compounds:
3-D crystal shape
low boiling/melting point
high melting point
conduct electricity as a solid
conduct electricity when dissolved in water
choose the substances that are organic (3 answers):
Cotton t-shirt
Salt
Sugar
Paper
Water
choose the substances that are inorganic (3 answers):
Cotton t-shirt
Salt
Sugar
Aluminum
Water
Water has a density of 1 g/cm3. If you drop an object that has a density of .05 g/cm3 into the water, what would happen?
the object would sink
the object would float
Water has a density of 1 g/cm3. If you drop an object that has a density of 5 g/cm3 into the water, what would happen?
the object would sink
the object would float
How many atoms of Hydrogen in ONE molecule of sugar?
6
12
24
How many atoms of Hydrogen in TWO molecules of sugar?
6
12
24
Identify the REACTANTS:
Identify the PRODUCTS:
An atom that loses an electron becomes a _______ ion.
positive
negative
An atom that gains an electron becomes a _______ ion.
positive
negative
The outermost electrons are called:
value electrons
valence electrons
How many Sodium (Na+) ions are needed to balance the charge of one Chloride (Cl-) ion? (*Hint* think about the formula for salt!)
1
2
Ionic bonds form between:
2 or more nonmetals
a metal and a nonmetal
Covalent bonds form between:
2 or more nonmetals
a metal and a nonmetal
True or False: Covalent bonds are easier to break than Ionic bonds.
(a)
The type of covalent bond where the atoms pull unequally on the shared electrons is called:
polar
nonpolar
The type of covalent bond where the atoms pull equally on the shared electrons is called:
polar
nonpolar
Choose the examples of molecular compounds that have polar bonds (2 answers):
water
oil
carbon dioxide
ammonia
Choose the examples of molecular compounds that have nonpolar bonds (2 answers):
water
oil
carbon dioxide
ammonia
Choose the examples that show a physical change (3 answers):
Choose the examples that show a chemical change (3 answers):
What things are examples of things we might observe that indicate a chemical change has occurred? (3 answers)
a color change
bubbles as a gas is created
tears, folds, or cuts
cracking or crumbling away of material
changing phase (boiling, freezing, etc.)
Type of chemical reaction that absorbs energy:
exothermic
endothermic
Type of chemical reaction that releases energy:
exothermic
endothermic
To have a complete outer shell, an atom (except H and He) needs to have (a) electrons. (type a number)
Number of Valence Electrons in Neon?
(a)
Number of Valence Electrons in Chlorine?
(a)
Number of Valence Electrons in Sodium?
(a)
Number of Valence Electrons in Oxygen?
(a)
What number goes in the box for the equation to be balanced?
(a)
A rock has a mass of 500g and a volume of 10 cm3. What is its density?
(a)
