1.
What is the formula for Magnesium Oxide?
Explanation
The formula for Magnesium Oxide is MgO. This is because Magnesium (Mg) has a +2 charge, while Oxygen (O) has a -2 charge. To balance the charges, one Mg atom combines with one O atom, resulting in the formula MgO.
2.
What is the formula for Aluminum Nitride?
Explanation
The formula for Aluminum Nitride is AlN.
3.
What is the formula for Lithium Iodide?
Explanation
The formula for Lithium Iodide is LiI because Lithium is a metal with a +1 charge and Iodide is a non-metal with a -1 charge. When these two ions combine, they form a compound with a neutral charge. Therefore, one Lithium ion and one Iodide ion are needed to balance the charges, resulting in the formula LiI.
4.
What is the formula for Sodium Fluoride?
Explanation
The formula for Sodium Fluoride is NaF.
5.
What is the formula for Beryllium Oxide?
Explanation
Beryllium oxide is represented by the chemical formula BeO.
6.
What is the name of the compound AlCl3?
Explanation
AlCl3 is the chemical formula for Aluminum Chloride. It is a compound composed of one aluminum atom and three chlorine atoms. Aluminum Chloride is commonly used as a catalyst in various chemical reactions and as an ingredient in the production of aluminum metal. It is a white solid that is highly soluble in water and has a strong odor.
7.
What is the name of the compound Mg3N2?
Explanation
The name of the compound Mg3N2 is Magnesium Nitride.
8.
What is the name of the compound CaO?
Explanation
Calcium Oxide is the correct name for the compound CaO. The compound is formed by the combination of the element calcium (Ca) and oxygen (O). In chemical nomenclature, the name of a compound is determined by the elements it contains. In this case, the compound contains calcium and oxygen, so it is named calcium oxide.
9.
What is the name of the compound MgI2?
Explanation
The name of the compound MgI2 is Magnesium Iodide.
10.
What is the name of the compound NiO?
Explanation
The correct answer is Nickel II Oxide. Nickel II Oxide is the name of the compound NiO.
11.
What is the name of the compound NaBr?
Explanation
The name of the compound NaBr is Sodium Bromide.
12.
What is the name of the compound KCl?
Explanation
Potassium chloride is the correct name for the compound KCl. This is because K represents the chemical symbol for potassium, and Cl represents the chemical symbol for chloride. When these two elements combine, they form the compound potassium chloride.
13.
What is the formula for Mercury II Oxide?
Explanation
Mercury II Oxide is represented by the chemical formula HgO. In this compound, one mercury atom is bonded with one oxygen atom. The symbol Hg represents mercury, and O represents oxygen. The subscript 2 in the name indicates that there are two oxygen atoms present in the compound. Therefore, the correct formula for Mercury II Oxide is HgO.
14.
What is the formula for Lithium Sulfide?
Explanation
The formula for Lithium Sulfide is Li2S. This means that a molecule of lithium sulfide consists of two lithium atoms and one sulfur atom. The subscript "2" indicates that there are two lithium atoms present in the compound, while the "S" represents the sulfur atom. This formula follows the rules of ionic bonding, where lithium, a metal, donates one electron to sulfur, a nonmetal, resulting in the formation of a stable compound.
15.
Which of the following types of ions is positive?
Correct Answer
A. Cation
Explanation
Cations are positively charged ions because they have lost electrons, resulting in an overall positive charge. Anions, on the other hand, are negatively charged ions because they have gained electrons, resulting in an overall negative charge. Therefore, the correct answer is cation.
16.
Which of the following ions is negative?
Correct Answer
B. Anion
Explanation
An ion is an atom or molecule that has gained or lost electrons, resulting in a positive or negative charge. A cation is a positively charged ion, meaning it has lost electrons. On the other hand, an anion is a negatively charged ion, meaning it has gained electrons. Therefore, the correct answer is anion, as it is the ion that carries a negative charge.
17.
Which of the following are properties of ionic compounds
Correct Answer(s)
B. High boiling point
D. Brittle
E. Electrolyte in water
G. Does not conduct electricity as a solid.
Explanation
Ionic compounds have high boiling points because the strong electrostatic forces between the positively and negatively charged ions require a significant amount of energy to break the bonds and convert the solid into a liquid. They are brittle because the arrangement of ions in the crystal lattice is easily disrupted, causing the lattice to shatter. Ionic compounds can conduct electricity in water because the ions dissociate in the solution, allowing for the movement of charged particles. However, they do not conduct electricity as a solid because the ions are held in fixed positions and cannot move to carry a current.
18.
The goal of all atoms is to become _____
Correct Answer(s)
Stable, Balanced
Explanation
Atoms strive to become stable and balanced by achieving a full outer electron shell. This is because a full outer shell is energetically favorable and leads to a more stable configuration. Atoms can achieve this stability by gaining, losing, or sharing electrons with other atoms through chemical bonding. Once an atom achieves a stable and balanced state, it is less likely to undergo chemical reactions and is considered to be in a more favorable and energetically stable state.
19.
Which will have more lattice energy?
Correct Answer
A. LiF
Explanation
Lattice energy is the measure of the strength of the ionic bond in a crystal lattice. It depends on the charges of the ions and their sizes. In LiF, lithium (Li) has a +1 charge and fluoride (F) has a -1 charge. The charges are higher compared to the other compounds listed. Additionally, the size of the ions in LiF is smaller compared to the others. Both the higher charges and smaller size contribute to stronger electrostatic attraction between the ions, resulting in higher lattice energy in LiF compared to the other compounds.
20.
Which would have more lattice energy?
Correct Answer
D. AlCl3
Explanation
AlCl3 would have more lattice energy compared to the other compounds listed. Lattice energy is a measure of the energy released when ions in a crystal lattice arrangement come together to form a solid. It is influenced by factors such as the charge of the ions and their size. In AlCl3, aluminum (Al) has a +3 charge and chlorine (Cl) has a -1 charge, resulting in a strong electrostatic attraction between the ions. Additionally, the smaller size of aluminum and chlorine ions compared to the other ions listed further enhances the lattice energy in AlCl3.
21.
How many Valence Electrons does Chlorine have?
Correct Answer
7
Explanation
Chlorine has 7 valence electrons. The number of valence electrons is determined by the group number of the element in the periodic table. Chlorine is in group 17, also known as the halogens, which means it has 7 valence electrons. Valence electrons are the electrons in the outermost energy level of an atom and they play a crucial role in determining the chemical properties of an element.
22.
What is Zinc's oxidation number ALWAYS?
Correct Answer
+2
Explanation
Zinc's oxidation number is always +2 because it is a transition metal with two valence electrons. Transition metals typically lose these two electrons to form a stable +2 oxidation state. This is because the loss of these electrons fills the d orbital, resulting in a more stable configuration. Therefore, regardless of the compound or reaction, zinc will always have an oxidation number of +2.
23.
What is Sodium's Oxidation number?
Correct Answer
+1
Explanation
The oxidation number of an element represents the number of electrons that an atom can gain, lose, or share when it forms compounds. In the case of sodium, it belongs to Group 1 of the periodic table, which means it has one valence electron. Sodium readily loses this electron to achieve a stable electron configuration, resulting in an oxidation number of +1. This is because the loss of one electron gives sodium a complete outer shell, similar to the noble gas configuration of neon.
24.
When drawing lewis structures what do all of the ions need to have around it?
Correct Answer(s)
A. Brackets
B. Charges
Explanation
When drawing Lewis structures, all ions need to have brackets and charges around them. Brackets are used to enclose the ion and indicate that it carries a charge. Charges are necessary to represent the overall charge of the ion. This helps in accurately representing the electron distribution and understanding the bonding and structure of the compound.
25.
What is the symbol for Potassium
Correct Answer
A. K
Explanation
The symbol for Potassium is K.