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WorksheetsEOC Chemistry 2020 (Practice Exam)
Total questions: 40
Worksheet time: 10hrs 0mins
A ____________ reaction is a process in which some substances change to other substances as chemical bonds break and reform.
chemical
statistical
physical
physiological
Anytime a hydrocarbon burns, like a candle or wood, a combustion reaction takes place. What happens in a combustion reaction?
H2O and CO2 turn into O2 and a Hydrocarbon
H2O and O2 turn into a Hydrocarbon and CO2
A Hydrocarbon and H2O turn into O2 and CO2
A Hydrocarbon and O2 turn into H2O and CO2
Using proper significant digits, what is the rounded correct answer for:
12.00 m + 15.001 m =
27.001
27.0
27.00
27
Which of the following is standard notation to represent
6 x 10-2
60
600
0.06
0.006
How many mL are measured?
(Use proper sig figs)
24.0 mL
25.0 mL
24 mL
25 mL
One of your classmates ask you, "Why does an ice cube melt in water?"
The ice cube transfers energy to the water
The water transfers energy to the ice cube
Energy is transferred from the ice to the water and from the water to the ice
The ice cube transfers energy to the air
When you hold a hot mug with your hands, the temperature of your hands begins to increase due to a transfer of thermal energy. Which of the following is responsible for this energy transfer on a microscopic level?
Collisions among atoms increase
Space between atoms increases
Size of atoms increase
Size of atoms decrease
The heating curve below shows what happens as heat is added to a piece of ice at a constant rate. What is occurring during the portion of the heating curve labeled E?
liquid water is freezing
liquid water is evaporating
water vapor is condensing
water vapor is warming up
Each of the substances are at room temp. If you heat 10 gram samples of each substance in the table below, which sample will reach 75 °C last?
Methanol
Air
Aluminum
Brass
The substances in a beaker are at room temperature before a chemical reaction takes place. What do you know if you touch a beaker during the chemical reaction and it feels hot?
The reaction is exothermic. Heat transfers from my hand to the beaker
The reaction is endothermic. Heat transfers from my hand to the beaker
The reaction is exothermic. Heat transfers from the beaker to my hand.
The reaction is endothermic. Heat transfers from the beaker ot my hand.
How much energy is required to raise the temperature of 85g of glass (cglass= 0.16 cal/g°C) from 25°C to 64°C?
Hint: q=mcΔT
340 cal
530 cal
540 cal
870 cal
Which is an example of matter?
a cloud
an opinion
sound
a concept
The nucleus of an atom can be described as:
having a negligible mass
dense and positively charged
dense and negatively charged
spacious and negatively charged
According to Rutherford, most of the mass of the atom is:
In the nucleus
In the form of electrons
Contained in the orbital clouds
In the form of electricity
How many valence electrons does Oxygen have?
(Type in ONLY the number)
(a)
From the elements below, which is the largest
Li (Lithium)
F (Fluorine)
Cs (Cesium)
At (Astantine)
What is the chemical formula for:
Copper (II) Oxide
Cu2O
CuO
CuO2
Cu2O3
Electronegativity is the tendency for atoms to:
give up electrons
to become electrical
have metallic character
attract a shared pair of electrons
Fluorine is ________ electronegative than Lithium
less
the same
more
Which element would you expect to have chemical properties most similar to the chemical properties of Chlorine?
Oxygen
Sulfur
Argon
Iodine
Which group of elements is the MOST electronegative?
Alkali Metals
Alkali Earth Metals
Halogens
Noble Gases
Which is the group than contains compounds that will all emit a similar color if heated in a flame?
Group 1: CuSO4, BaSO4, MgSO4
Group 2: BaSO4, BaCl2, Ba(NO3)2
Group 3: K2SO4, KCl, BaCl2
Group 4: Li2SO4, BaSO4, LiCl
Name this compound:
MgO
(Spelling counts!)
(a)
Out of the choices below, what could the Lewis structure be?
Oxygen
Helium
Lithium
Aluminum
What is the charge of the CATION in:
CaS
-2
+2
+1
-1
Name this compound by covalent naming rules:
H2O
Hint: The answer is not water
1. mono-
2. di-
3. tri-
4. tetra-
(a)
How many total valence electrons does
HCl
have?
(Type in just the number)
(a)
True or false:
London dispersion forces are the strongest of the intermolecular forces
True
False
Which is the correct Lewis structure of CH3Cl
A
B
C
D
Ionic compounds are a result of
Metal-metal bonding
Metal-nonmetal bonding
Nonmetal-nonmetal bonding
Minimal electronegativity differences
Use the table to determine the color of the flame produced in a flame test by a sample of Barium hydroxide
Ba(OH)2
yellow-orange
pink-lilac
green
yellow-green
Above is the spectra of 3 gases and an unknown. What could the unknown be?
Gas A only
Gas A and B
Gas A and C
Gas C
When do electrons jump to higher energy levels?
As they absorb energy
As they emit energy
As they lose energy
As they bump into one another
Motor oil does not easily dissolve in water. Which is the correct explanation for this?
Motor oil is Polar, Water is Nonpolar; they attract
Motor oil is Nonpolar, Water is Polar; they attract
Motor oil is Nonpolar, Water is Polar; they do not attract
Motor oil is Polar, Water is Nonpolar; they do not attract
Use the periodic table. Which of the following elements has the largest number of protons?
Cobalt, Co
Nickel, Ni
Scandium, Sc
Titanium, Ti
Which of these are the correct labels for the two Bohr models below?
Fluorine atom (Left); Fluoride Ion with charge -1 (Right)
Fluorine atom (Left); Fluoride Ion with charge +1 (Right)
Fluorine atom (Left); Neon Atom (Right)
Neon Ion with charge +1 (Left), Neon Atom (Right)
Which of these elements has 3 valence electrons
Carbon
Boron
Beryllium
Lithium
Which of these particles is involved in bonding?
Electrons
Neutrons
Nuclei Particles
Protons
Polar bonds are a result of:
Electronegativity differences
London Dispersion Forces
Electrons absorbing energy
Equal electronegativity
Which of these 3 molecules is nonpolar?
H2O
CH4
HCl
