Jlabs Exam Questions and Answers
100% Pass
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? -
✔✔Solvent
How many electrons does the iron ion have when it forms the ionic compound FeCl3? -
✔✔23
What is the volume of the water in this graduated cylinder? - ✔✔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? - ✔✔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? - ✔✔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? - ✔✔67.2 L
Which substance will release the greatest amount of heat when 1.00 mol is frozen? -
✔✔Benzene
A student hypothesizes that bromine (Br) has different chemical properties from
krypton (Kr). The periodic table supports this hypothesis by indicating that - -
✔✔bromine and krypton have different numbers of valence electrons
© EMILY CHARLENE YEAR 2025-2026, ALL RIGHTS RESERVED 1
, 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? -
✔✔80 mmHg
Zn(s) + 2HCl(aq) → ZnCl2 + H2(g)
What type of reaction is shown? - ✔✔Single Replacement
Hydrogen chloride is a covalent compound. Which is a correct Lewis dot structure for
HCl? - ✔✔..
H:Cl:
.. All dots surrounding Cl none around H
Which is the best use for a fume hood? - ✔✔Removing toxic vapors
Which of the following equations is balanced? - ✔✔2Na + Cl2 → 2NaCl
The picture shows a small section of elements from the periodic table. Which element
has one more proton than element X? - ✔✔4
An example of a chemical property is - ✔✔tendency to undergo oxidation
What is the name for the compound CaSO4? - ✔✔Calcium sulfate
Which of these best describes the basis on which new scientific ideas are accepted or
rejected? - ✔✔Compelling evidence
The number of molecules in 48.0 grams of oxygen gas (O2) is - ✔✔9.03 × 1023
Al(s) + 3AgNO3(aq) → Al(NO3)3(aq) + 3Ag(s)
© EMILY CHARLENE YEAR 2025-2026, ALL RIGHTS RESERVED 2
100% Pass
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? -
✔✔Solvent
How many electrons does the iron ion have when it forms the ionic compound FeCl3? -
✔✔23
What is the volume of the water in this graduated cylinder? - ✔✔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? - ✔✔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? - ✔✔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? - ✔✔67.2 L
Which substance will release the greatest amount of heat when 1.00 mol is frozen? -
✔✔Benzene
A student hypothesizes that bromine (Br) has different chemical properties from
krypton (Kr). The periodic table supports this hypothesis by indicating that - -
✔✔bromine and krypton have different numbers of valence electrons
© EMILY CHARLENE YEAR 2025-2026, ALL RIGHTS RESERVED 1
, 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? -
✔✔80 mmHg
Zn(s) + 2HCl(aq) → ZnCl2 + H2(g)
What type of reaction is shown? - ✔✔Single Replacement
Hydrogen chloride is a covalent compound. Which is a correct Lewis dot structure for
HCl? - ✔✔..
H:Cl:
.. All dots surrounding Cl none around H
Which is the best use for a fume hood? - ✔✔Removing toxic vapors
Which of the following equations is balanced? - ✔✔2Na + Cl2 → 2NaCl
The picture shows a small section of elements from the periodic table. Which element
has one more proton than element X? - ✔✔4
An example of a chemical property is - ✔✔tendency to undergo oxidation
What is the name for the compound CaSO4? - ✔✔Calcium sulfate
Which of these best describes the basis on which new scientific ideas are accepted or
rejected? - ✔✔Compelling evidence
The number of molecules in 48.0 grams of oxygen gas (O2) is - ✔✔9.03 × 1023
Al(s) + 3AgNO3(aq) → Al(NO3)3(aq) + 3Ag(s)
© EMILY CHARLENE YEAR 2025-2026, ALL RIGHTS RESERVED 2
