Chemistry Quiz - Level 2
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Questions and Answers
- 1.
Atoms are neutral because they have _______________ ?
- A.
The same number of protons and neutrons
- B.
The same number of electrons and neutrons
- C.
The same number of protons and electrons
- D.
Different numbers of protons and neutrons
Correct Answer
C. The same number of protons and electronsExplanation
Atoms are neutral because they have the same number of protons and electrons. Protons have a positive charge, while electrons have a negative charge. Since the charges of protons and electrons are equal in magnitude, the atom as a whole has no net charge and is therefore neutral.Rate this question:
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- 2.
Atoms or groups of atoms with a charge are called ions.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Ions are atoms or groups of atoms that have a charge. This means that they have gained or lost electrons, resulting in a positive or negative charge. Therefore, the statement that atoms or groups of atoms with a charge are called ions is true.Rate this question:
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- 3.
Ions are created by gaining or losing _________________?
- A.
Electrons
- B.
Protons
- C.
Neutrons
- D.
Atoms
Correct Answer
A. ElectronsExplanation
Ions are created by gaining or losing electrons. When an atom gains or loses electrons, it becomes electrically charged and forms an ion. If an atom gains electrons, it becomes negatively charged and forms a negative ion (anion). If an atom loses electrons, it becomes positively charged and forms a positive ion (cation). Therefore, the correct answer is electrons.Rate this question:
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- 4.
By using the Periodic Table, we can predict the charge of an ion that a particular atom will create. What information on the periodic table helps with this prediction?
- A.
Atomic Number
- B.
Mass Number
- C.
Period Number
- D.
Group Number
Correct Answer
D. Group NumberExplanation
The group number on the periodic table helps with predicting the charge of an ion that a particular atom will create. This is because elements in the same group have similar chemical properties and tend to form ions with the same charge. For example, elements in Group 1 (such as sodium and potassium) tend to form ions with a +1 charge, while elements in Group 2 (such as magnesium and calcium) tend to form ions with a +2 charge. Therefore, knowing the group number of an atom can provide information about the charge of the ion it will form.Rate this question:
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- 5.
Flourine, Chlorine and Bromine will all form ions with what charge?
- A.
+1
- B.
+2
- C.
-1
- D.
-2
Correct Answer
C. -1Explanation
Fluorine, chlorine, and bromine are all halogens, which belong to Group 17 of the periodic table. Halogens have a tendency to gain one electron to achieve a stable electron configuration, resulting in the formation of an ion with a charge of -1. Therefore, the correct answer is -1.Rate this question:
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- 6.
The formula for Magnesium Chloride is *Number in the answers below should be sub-script (ie small and below the letters)
- A.
MgCl
- B.
Mg2Cl3
- C.
MgCl2
- D.
Mg2Cl
Correct Answer
C. MgCl2Explanation
The correct answer is MgCl2. This is because the formula for Magnesium Chloride consists of one magnesium ion (Mg2+) and two chloride ions (Cl-), resulting in the formula MgCl2.Rate this question:
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- 7.
Avagadro's Number is based on which element?
- A.
Carbon
- B.
Nitrogen
- C.
Oxygen
- D.
Hydrogen
Correct Answer
A. CarbonExplanation
Avogadro's Number is based on the element Carbon. This number represents the number of atoms or molecules in one mole of a substance. It is defined as 6.022 x 10^23 and is used in various calculations in chemistry, such as determining the number of atoms in a sample or calculating molar mass. Carbon is chosen as the basis for Avogadro's Number because it is a common element found in many compounds and has a relatively stable atomic mass.Rate this question:
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- 8.
Avogadros Number is
- A.
6.1023
- B.
6.02 x 10^23
- C.
6000000001023
- D.
6.10 x 23
Correct Answer
B. 6.02 x 10^23Explanation
Avogadro's Number is a fundamental constant in chemistry and physics that represents the number of atoms or molecules in one mole of a substance. It is approximately equal to 6.02 x 10^23 particles per mole. This value is derived from Avogadro's constant, which is the number of atoms in exactly 12 grams of carbon-12. Therefore, the correct answer is 6.02 x 10^23.Rate this question:
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- 9.
Calculate the number of moles in 36.8 grams of Oxygen
Correct Answer
2.3Explanation
To calculate the number of moles in a substance, we use the formula: moles = mass / molar mass. The molar mass of oxygen is approximately 16 g/mol. Therefore, we can calculate the number of moles by dividing the given mass of 36.8 grams by the molar mass of oxygen. The result is 2.3 moles.Rate this question:
- 10.
Calculate the mass of 3.6 moles of Iron (units NOT required in answer)
Correct Answer
201.06Explanation
The molar mass of iron (Fe) is 55.845 g/mol. To calculate the mass of 3.6 moles of iron, we can multiply the molar mass by the number of moles: 55.845 g/mol * 3.6 mol = 201.06 g.Rate this question:
- 11.
What is the Molecular Mass of NaCl? (units NOT required in answer)
Correct Answer
58.44Explanation
The molecular mass of NaCl is 58.44. This is the sum of the atomic masses of sodium (Na) and chlorine (Cl) in one molecule of NaCl. Sodium has an atomic mass of 22.99 and chlorine has an atomic mass of 35.45. Adding these two values together gives us a total of 58.44.Rate this question:
- 12.
Non-Metal atoms join together with which type of bond?
- A.
Covalent
- B.
Metallic
- C.
Ionic
- D.
Strong
Correct Answer
A. CovalentExplanation
Non-metal atoms join together with a covalent bond. In a covalent bond, non-metal atoms share electrons in order to achieve a stable electron configuration. This type of bond occurs between two non-metal atoms or between a non-metal and a hydrogen atom. Covalent bonds are typically strong and result in the formation of molecules.Rate this question:
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- 13.
In metallic bonds, the electrons are often free to move through the material. This relates to which property of metals?
- A.
Strength
- B.
Luster
- C.
Electrical Conductivity
- D.
Malleability
Correct Answer
C. Electrical ConductivityExplanation
The property of metals that relates to the given statement is electrical conductivity. In metallic bonds, the outer electrons of metal atoms are delocalized, meaning they are not bound to any specific atom and are free to move throughout the material. This allows metals to conduct electricity as the free electrons can carry electric current.Rate this question:
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- 14.
Bonding occurs as it helps make the atoms more stable?
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Bonding occurs between atoms to make them more stable by filling their outer electron shells. When atoms bond, they share, gain, or lose electrons to achieve a full outer shell, which is the most stable electron configuration. This stability is achieved by reducing the energy of the system, making bonding a favorable process. Therefore, the statement that bonding helps make atoms more stable is true.Rate this question:
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- 15.
Ionic bonds occur between ________________?
- A.
Metal atoms
- B.
Non-Metal atoms
- C.
Metal and Non-Metal atoms
- D.
Atoms of the same element
Correct Answer
C. Metal and Non-Metal atomsExplanation
Ionic bonds occur between metal and non-metal atoms. This is because ionic bonds involve the transfer of electrons from the metal atom to the non-metal atom, resulting in the formation of ions with opposite charges. The attraction between these ions creates a strong bond.Rate this question:
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- 16.
Covalent Molecular substance have weak inter-molecular bonds. This results in which property?
- A.
Low melting and boiling points
- B.
High melting and boiling points
- C.
Brittle materials
- D.
Strong materials
Correct Answer
A. Low melting and boiling pointsExplanation
Covalent molecular substances have weak intermolecular bonds, which means that the molecules are held together by relatively weak forces. These weak intermolecular bonds result in low melting and boiling points for covalent molecular substances. When heat is applied, the weak forces between the molecules are easily overcome, causing the substance to melt or boil at relatively low temperatures. Therefore, the correct answer is low melting and boiling points.Rate this question:
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Mar 18, 2023Quiz Edited by
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