Transcript chemistry tutoring session

Chemistry practice questions
When copper and oxygen chemically unite, they
form —
F an ion
G a gas
H a compound
J a mixture
When copper and oxygen chemically unite, they
form —
H a compound
Which of the following would most increase the
rate at which magnesium nitrate dissolves in a
liquid solvent?
F Increasing the pressure on the liquid
G Keeping the liquid still and undisturbed
H Lowering the temperature of the liquid
J Breaking the crystals into smaller pieces
Which of the following would most increase the
rate at which magnesium nitrate dissolves in a
liquid solvent?
J Breaking the crystals into smaller pieces
Two students added a piece of zinc to a solution of
hydrochloric acid in an open beaker. The mass of the
products was found to be less than the total mass of
the reactants. How should the students have
conducted their experiment to reflect the law of
conservation of mass?
A the students should have used a less reactive
metal in their experiment.
B The students should have conducted the
experiment in a closed system.
C The students should have left the beaker on the
scale during the entire reaction.
D The law of conservation of mass does not apply to
all chemical reactions, and the students’ results
properly reflect that.
Two students added a piece of zinc to a solution of
hydrochloric acid in an open beaker. The mass of the
products was found to be less than the total mass of
the reactants. How should the students have
conducted their experiment to reflect the law of
conservation of mass?
.
B The students should have conducted the
experiment in a closed system.
Two students added a piece of zinc to a solution of
hydrochloric acid in an open beaker. The mass of
the products was found to be less than the total
mass of the reactants. Which of the following
statements best explains the loss of mass?
A Zinc metal is more dense than the acid.
B The chemical activity of the acid
destroyed metal atoms.
C A gas was released during the reaction.
D Some of the zinc atoms failed to react.
Two students added a piece of zinc to a solution of
hydrochloric acid in an open beaker. The mass of
the products was found to be less than the total
mass of the reactants. Which of the following
statements best explains the loss of mass?
C A gas was released during the reaction.
__Fe + __O2 → __Fe2O3
Iron reacts with oxygen in the air to form iron
oxide. The unbalanced equation for this reaction
is shown above. What are the coefficients when
this equation is balanced?
F 2,2,1
G 2,3,1
H 4,3,2
J 4,2,2
__Fe + __O2 → __Fe2O3
Iron reacts with oxygen in the air to form iron
oxide. The unbalanced equation for this reaction
is shown above. What are the coefficients when
this equation is balanced?
H 4,3,2
An inventor claims to have created a wind turbine
that can convert 1 kilogram of water into 1 kilogram
of oxygen and 1 kilogram of high-energy hydrogen
fuel.
1 kg water → 1 kg oxygen + 1 kg hydrogen
This claim is false because it —
F violates the principle of constant
composition
G contradicts the law of conservation of matter
H ignores the strength of the theory of strings
J violates the rules of gravitational attraction
An inventor claims to have created a wind turbine
that can convert 1 kilogram of water into 1 kilogram
of oxygen and 1 kilogram of high-energy hydrogen
fuel.
1 kg water → 1 kg oxygen + 1 kg hydrogen
This claim is false because it —
G contradicts the law of conservation of matter
Which of these steps in the digestive process is a
physical change?
F Water being absorbed in the large intestine
G Enzymes breaking down proteins into amino acids
H Saliva changing starches into sugars
J Insulin breaking down simple sugars into smaller
molecules
Which of these steps in the digestive process is a
physical change?
F Water being absorbed in the large intestine
Which characteristic of water molecules makes
water a good solvent?
F Mass
G Polarity
H Potential energy
J Chemical energy
Which characteristic of water molecules makes
water a good solvent?
G Polarity
A student creates the above model of an atom. The overall
charge of the atom
represented in this model is
B. Neutral
Beryllium
Be
-
-
+++++
++++++
00000
-
-
-
-
Sodium (Na)
-
-
+++++
++++++
00000
-
-
-
-
Substance
Specific heat capacity (J/kg x oC)
Aluminum
899
Copper
387
Gold
129
Silver
234
Water
4,184
Wood
176
Which of the following conclusions can be drawn from the
information shown?
A.
B.
C.
D.
Most types of matter heat up at the same rate.
Most types of matter cool down at the same rate.
It takes less energy to heat 1 g of silver then 1 g of gold.
It takes more energy to heat 1 g of water then 1 g of copper.
Substance
Specific heat capacity (J/kg x oC)
Aluminum
899
Copper
387
Gold
129
Silver
234
Water
4,184
Wood
176
Which of the following conclusions can be drawn from the
information shown?
A.
It takes more energy to heat 1 g of water then 1 g of copper.
Which of the following elements would be the
best conductor?
A. Au
B. C
C. Ne
D. S
Which of the following elements would be the
best conductor?
A. Au
Which two elements are most similar?
F. H and O
G. Fe and Co
H. Li and F
J. Mg and Sr
Which two elements are most similar?
J. Mg and Sr
The formula that represents sodium
chloride, commonly known as salt, is –
A.
B.
C.
D.
H 2O
NaCl
SaLt
SoCh
The formula that represents sodium
chloride, commonly known as salt, is –
B. NaCl
This Bohr model represents the element –
F. Carbon
G. Fluorine
H. Oxygen
J. Neon
This Bohr model represents the element –
G. Fluorine
What part of the oxygen atom contains
neutral particles?
A.
B.
C.
D.
Electrons
Electron clouds
Isotopes
Nucleus
What part of the oxygen atom contains
neutral particles?
D. Nucleus
Which of the following must be the
same for every atom of the element
hydrogen?
F. Atomic mass
G. Number of electrons
H. Number of neutrons
J. Number of protons
TAKS 3
8.8A, 8.8B
TEKS
Which of the following must be the
same for every atom of the element
hydrogen?
J. Number of protons
TAKS 3
8.8A, 8.8B
TEKS
You find an object that is shiny and solid. It
conducts heat and electricity. How would
the object be classified?
A.
B.
C.
D.
noble gas
non-metal
metal
halogen
TAKS 3
8.9B
TEKS
You find an object that is shiny and solid. It
conducts heat and electricity. How would
the object be classified?
C. Metal
TAKS 3
8.9B
TEKS
Which of the following is not a property of
an atom?
F. Color
G. Electric charge
H. Mass
J. Number of protons
TAKS 3
8.8A, 8.8B
TEKS
Which of the following is not a property of
an atom?
F. Color
Which of the following changes is not a
physical change?
A.
B.
C.
D.
Beating an egg
Making a tossed salad
Boiling water
Frying an egg
Which of the following changes is not a
physical change?
D. Frying an egg
Which of the following would be a poor
conductor of heat?
a. F
b. Ca
c. Au
d. Fe
Which of the following would be a poor
conductor of heat?
a. F
Which of the following is a naturally occurring
chemical
a. Salt
b. Nylon
c. Plastic
d. Tylenol
Which of the following is a naturally occurring
chemical
a. Salt
According to the Periodic Table of the
Elements, which element is most similar to
magnesium (Mg)?
A
B
C
D
calcium (Ca)
iodine (I)
sodium (Na)
sulfur (S)
According to the Periodic Table of the
Elements, which element is most similar to
magnesium (Mg)?
A calcium (Ca)
When Chemical X is added to a certain liquid,
the chemical breaks into Substances Y and Z. It
is not possible to break Substances Y and Z into
simpler particles.
Which statement is best supported by this
evidence?
A Chemical X is an element.
B Chemical X is soluble in water.
C Substances Y and Z are elements.
D Substances Y and Z are compounds.
When Chemical X is added to a certain liquid,
the chemical breaks into Substances Y and Z. It
is not possible to break Substances Y and Z into
simpler particles.
Which statement is best supported by this
evidence?
C Substances Y and Z are elements.
The graph shows the relationship between mass and time for a
radioactive element during radioactive decay.
What is the half-life (time it takes for half of the element) to break
down?
A. 20 billion years
B. 60 billion years
C. 125 billion years
D. 180 billion years
The graph shows the relationship between mass and time for a
radioactive element during radioactive decay.
What is the half-life (time it takes for half of the element) to break
down?
A. 60 billion years