JLABS EXAM UPDATED Exam Questions
and CORRECT Answers
When 1 g of sodium chloride (NaCl) is placed in 100 g of water, a solution results. Once the
solution is prepared, water is now considered what part of the solution? - CORRECT
ANSWER - Solvent
How many electrons does the iron ion have when it forms the ionic compound FeCl3? -
CORRECT ANSWER - 23
What is the volume of the water in this graduated cylinder? - CORRECT ANSWER - 4.39
mL
The product in a balanced reaction is 4Al2O3. Which of the following shows the number of
aluminum and oxygen atoms in 4Al2O3? - CORRECT ANSWER - 8 atoms of aluminum
and 12 atoms of oxygen
For an equal mass of each substance, which one will require the least amount of heat to raise its
temperature from 20°C to 30°C? - CORRECT ANSWER - Glass
For an equal mass of each substance, which one will require the least amount of heat to raise its
temperature from 20°C to 30°C? - CORRECT ANSWER - 67.2 L
Which substance will release the greatest amount of heat when 1.00 mol is frozen? - CORRECT
ANSWER - Benzene
A student hypothesizes that bromine (Br) has different chemical properties from krypton (Kr).
The periodic table supports this hypothesis by indicating that - - CORRECT ANSWER -
bromine and krypton have different numbers of valence electrons
, A mixture of gases with a pressure of 800 mmHg contains 10% oxygen and 90% nitrogen by
volume. What is the partial pressure of the oxygen gas in the mixture? - CORRECT
ANSWER - 80 mmHg
Zn(s) + 2HCl(aq) → ZnCl2 + H2(g)
What type of reaction is shown? - CORRECT ANSWER - Single Replacement
Hydrogen chloride is a covalent compound. Which is a correct Lewis dot structure for HCl? -
CORRECT ANSWER - ..
H:Cl:
.. All dots surrounding Cl none around H
Which is the best use for a fume hood? - CORRECT ANSWER - Removing toxic vapors
Which of the following equations is balanced? - CORRECT ANSWER - 2Na + Cl2 →
2NaCl
The picture shows a small section of elements from the periodic table. Which element has one
more proton than element X? - CORRECT ANSWER -4
An example of a chemical property is - CORRECT ANSWER - tendency to undergo
oxidation
What is the name for the compound CaSO4? - CORRECT ANSWER - Calcium sulfate
Which of these best describes the basis on which new scientific ideas are accepted or rejected? -
CORRECT ANSWER - Compelling evidence
and CORRECT Answers
When 1 g of sodium chloride (NaCl) is placed in 100 g of water, a solution results. Once the
solution is prepared, water is now considered what part of the solution? - CORRECT
ANSWER - Solvent
How many electrons does the iron ion have when it forms the ionic compound FeCl3? -
CORRECT ANSWER - 23
What is the volume of the water in this graduated cylinder? - CORRECT ANSWER - 4.39
mL
The product in a balanced reaction is 4Al2O3. Which of the following shows the number of
aluminum and oxygen atoms in 4Al2O3? - CORRECT ANSWER - 8 atoms of aluminum
and 12 atoms of oxygen
For an equal mass of each substance, which one will require the least amount of heat to raise its
temperature from 20°C to 30°C? - CORRECT ANSWER - Glass
For an equal mass of each substance, which one will require the least amount of heat to raise its
temperature from 20°C to 30°C? - CORRECT ANSWER - 67.2 L
Which substance will release the greatest amount of heat when 1.00 mol is frozen? - CORRECT
ANSWER - Benzene
A student hypothesizes that bromine (Br) has different chemical properties from krypton (Kr).
The periodic table supports this hypothesis by indicating that - - CORRECT ANSWER -
bromine and krypton have different numbers of valence electrons
, A mixture of gases with a pressure of 800 mmHg contains 10% oxygen and 90% nitrogen by
volume. What is the partial pressure of the oxygen gas in the mixture? - CORRECT
ANSWER - 80 mmHg
Zn(s) + 2HCl(aq) → ZnCl2 + H2(g)
What type of reaction is shown? - CORRECT ANSWER - Single Replacement
Hydrogen chloride is a covalent compound. Which is a correct Lewis dot structure for HCl? -
CORRECT ANSWER - ..
H:Cl:
.. All dots surrounding Cl none around H
Which is the best use for a fume hood? - CORRECT ANSWER - Removing toxic vapors
Which of the following equations is balanced? - CORRECT ANSWER - 2Na + Cl2 →
2NaCl
The picture shows a small section of elements from the periodic table. Which element has one
more proton than element X? - CORRECT ANSWER -4
An example of a chemical property is - CORRECT ANSWER - tendency to undergo
oxidation
What is the name for the compound CaSO4? - CORRECT ANSWER - Calcium sulfate
Which of these best describes the basis on which new scientific ideas are accepted or rejected? -
CORRECT ANSWER - Compelling evidence
