UNE CHEM1010 Midterm Exam 2026 | Latest Update
2026 | 100% Correct Answers | Actual Exam Prep
1. How many neutrons does Vanadium 51 have?
29
28
51
4
2. What are the two key characteristics used to classify the performance of
measuring instruments in chemistry?
Volume and mass
Density and temperature
Accuracy and precision
Length and width
3. What is true about a generic gas?
Its volume is definite, its shape is not definite
Both its volume and shape are definite
Neither its volume, nor its shape is definite
Its volume is not definite, but its shape is definite
4. Molarity, M, is defined as:
moles of solute dissolved in 1 L of solvent.
moles of solute dissolved in 1 L of solution.
, moles of solute dissolved in 1 mol of solvent.
moles of solute dissolved in 1 kg of solvent.
moles of solute dissolved in the solution.
5. CaCO3 is a major chemical component in limestone and marble, materials
that can be damaged by acid rain. What is the chemical name for CaCO3?
calcium carbonate
calcium carbonite
calcium carbon trioxide
calcium carboxide
6. Describe the significance of the number of protons in determining the
identity of an isotope.
The number of protons determines the element's identity and its
position on the periodic table.
The number of protons indicates the number of electrons in a neutral
atom.
The number of protons affects the chemical reactivity of the element.
The number of protons determines the mass of the isotope.
7. Describe why an element is considered a fundamental substance in
chemistry.
An element can be created from simpler substances.
An element is a mixture of different substances.
An element is a fundamental substance because it cannot be
broken down into simpler substances by chemical means.
, An element can be separated into compounds through chemical
reactions.
8. The volume of a liquid is 26 mL. A student measures the volume and finds it to
be 26.2 mL, 26.1 mL, 25.9 mL, and 26.3 mL in the first, second, third, and fourth
trials, respectively. Which of the following statements is true for his
measurements?
They have poor accuracy.
They have poor precision.
They have good precision.
They are neither precise nor accurate.
9. Describe how isotopes of an element differ from each other.
Isotopes of an element differ in the number of protons they contain.
Isotopes of an element differ in the number of neutrons they
contain.
Isotopes of an element have the same number of neutrons but
different chemical properties.
Isotopes of an element differ in the number of electrons they contain.
10. The result of a multiplication or division should have how many significant
figures?
As many as the calculator returns to you
As many as the factor with the most amount of figures
As many as the factor with the least amount of figures
11. What charge does potassium typically have when it forms an ion?
, -1
+2
+1
-2
12. Standard Light Antarctic Precipitation (SLAP) is a common reference material
when making hydrogen isotope measurements. Analysis of SLAP shows that
it is 0.008917% 2H (mass 2.01410 amu) and the remainder is 1H (mass 1.00782
amu). What is the average mass of SLAP?
1.00791 amu
1.00797 amu
1.00783 amu
2.02994 amu
13. If a different Class-A pipette dispenses 10.00 mL of water consistently across
multiple trials, how would you classify this pipette in terms of accuracy and
precision?
Accurate, but not precise
Precise, but not accurate
Neither accurate nor precise
Accurate and precise
14. Describe the process of converting kilograms to milligrams using the
example of 405 kg.
To convert kilograms to milligrams, multiply the number of
kilograms by 1,000,000.
2026 | 100% Correct Answers | Actual Exam Prep
1. How many neutrons does Vanadium 51 have?
29
28
51
4
2. What are the two key characteristics used to classify the performance of
measuring instruments in chemistry?
Volume and mass
Density and temperature
Accuracy and precision
Length and width
3. What is true about a generic gas?
Its volume is definite, its shape is not definite
Both its volume and shape are definite
Neither its volume, nor its shape is definite
Its volume is not definite, but its shape is definite
4. Molarity, M, is defined as:
moles of solute dissolved in 1 L of solvent.
moles of solute dissolved in 1 L of solution.
, moles of solute dissolved in 1 mol of solvent.
moles of solute dissolved in 1 kg of solvent.
moles of solute dissolved in the solution.
5. CaCO3 is a major chemical component in limestone and marble, materials
that can be damaged by acid rain. What is the chemical name for CaCO3?
calcium carbonate
calcium carbonite
calcium carbon trioxide
calcium carboxide
6. Describe the significance of the number of protons in determining the
identity of an isotope.
The number of protons determines the element's identity and its
position on the periodic table.
The number of protons indicates the number of electrons in a neutral
atom.
The number of protons affects the chemical reactivity of the element.
The number of protons determines the mass of the isotope.
7. Describe why an element is considered a fundamental substance in
chemistry.
An element can be created from simpler substances.
An element is a mixture of different substances.
An element is a fundamental substance because it cannot be
broken down into simpler substances by chemical means.
, An element can be separated into compounds through chemical
reactions.
8. The volume of a liquid is 26 mL. A student measures the volume and finds it to
be 26.2 mL, 26.1 mL, 25.9 mL, and 26.3 mL in the first, second, third, and fourth
trials, respectively. Which of the following statements is true for his
measurements?
They have poor accuracy.
They have poor precision.
They have good precision.
They are neither precise nor accurate.
9. Describe how isotopes of an element differ from each other.
Isotopes of an element differ in the number of protons they contain.
Isotopes of an element differ in the number of neutrons they
contain.
Isotopes of an element have the same number of neutrons but
different chemical properties.
Isotopes of an element differ in the number of electrons they contain.
10. The result of a multiplication or division should have how many significant
figures?
As many as the calculator returns to you
As many as the factor with the most amount of figures
As many as the factor with the least amount of figures
11. What charge does potassium typically have when it forms an ion?
, -1
+2
+1
-2
12. Standard Light Antarctic Precipitation (SLAP) is a common reference material
when making hydrogen isotope measurements. Analysis of SLAP shows that
it is 0.008917% 2H (mass 2.01410 amu) and the remainder is 1H (mass 1.00782
amu). What is the average mass of SLAP?
1.00791 amu
1.00797 amu
1.00783 amu
2.02994 amu
13. If a different Class-A pipette dispenses 10.00 mL of water consistently across
multiple trials, how would you classify this pipette in terms of accuracy and
precision?
Accurate, but not precise
Precise, but not accurate
Neither accurate nor precise
Accurate and precise
14. Describe the process of converting kilograms to milligrams using the
example of 405 kg.
To convert kilograms to milligrams, multiply the number of
kilograms by 1,000,000.
