1.
The charge of beryllium is:
Correct Answer
A. +2
Explanation
Beryllium is a group 2 element in the periodic table, meaning it has 2 valence electrons. In order to achieve a stable electron configuration, it tends to lose these 2 electrons, resulting in a charge of +2. This charge allows beryllium to form compounds with other elements by donating its 2 electrons. Therefore, the correct answer is +2.
2.
The charge of hydrogen is:
Correct Answer
C. +1
Explanation
The charge of hydrogen is +1 because hydrogen has one electron in its outermost shell. It tends to lose this electron to achieve a stable configuration, resulting in a positive charge of +1.
3.
The charge of silver is:
Correct Answer
D. +1
Explanation
The charge of silver (Ag) in most of its common compounds is +1. This is because silver typically loses one electron to form a positively charged ion, Ag⁺.
4.
The charge of aluminum is:
Correct Answer
A. +3
Explanation
The charge of aluminum is +3 because it belongs to Group 13 in the periodic table, also known as the boron group. Elements in this group typically have three valence electrons, and when aluminum loses these electrons, it forms a cation with a charge of +3.
5.
The charge of carbonate is:
Correct Answer
C. -2
Explanation
The charge of carbonate is -2 because carbonate is a polyatomic ion that consists of one carbon atom and three oxygen atoms. The charge on the carbon atom is +4, while each oxygen atom carries a charge of -2. Since there are three oxygen atoms, the total negative charge is -6. To balance the charges, the carbon atom must have a charge of +4 to neutralize the -6 charge. Therefore, the overall charge of carbonate is -2.
6.
The symbol for zinc is
Correct Answer
A. Zn
Explanation
The correct symbol for zinc is Zn. This is because the symbol for an element is based on its atomic name, and in the case of zinc, the atomic name starts with the letter "Z." Therefore, the symbol "Zn" accurately represents the element zinc.
7.
The symbol for lead is
Correct Answer
A. Pb
Explanation
The correct symbol for lead is Pb. This is derived from the Latin word "plumbum," which is the origin of the element's name. Pb is the internationally recognized chemical symbol for lead in the periodic table.
8.
The symbol for ammonia is:
Correct Answer
D. NH3
Explanation
The symbol for ammonia, a compound composed of nitrogen and hydrogen, is NH3. It consists of one nitrogen atom bonded to three hydrogen atoms. Ammonia is a colorless gas with a pungent odor and is commonly used in household cleaning products, fertilizers, and industrial processes.
9.
The charge for Li is:
Correct Answer
A. +1
Explanation
The charge for Li is +1. This is because lithium is a Group 1 element, which means it has one valence electron. In order to achieve a stable electron configuration, lithium tends to lose this valence electron, resulting in a +1 charge.
10.
The symbol for tin is:
Correct Answer
A. Sn
Explanation
The symbol for tin is Sn. It comes from the Latin name for tin, stannum. The other symbols listed correspond to different elements or do not exist.
11.
B is what element?
Correct Answer
E. Boron
Explanation
The correct answer is boron because the question is asking for the element represented by the letter B. Among the given options, boron is the only element that starts with the letter B.
12.
The symbol for strontium is
Correct Answer
B. Sr
Explanation
The correct answer is Sr. Strontium is a chemical element with the symbol Sr on the periodic table. It is an alkaline earth metal that is commonly used in fireworks and flares due to its bright red color when ignited.
13.
The symbol for sulfide is
Correct Answer
A. S
Explanation
The symbol for sulfide is S. This is because the symbol represents the chemical element, and S is the symbol for sulfur. Sulfide refers to a compound that contains sulfur and has a negative charge, often represented as S2-. The other options, SO3, SO4, and Sn, represent different compounds or elements and are not the correct symbols for sulfide.
14.
Cl is the symbol for _____.
Correct Answer
chlorine, Chlorine
Explanation
Cl is the symbol for chlorine. Chlorine is a chemical element with atomic number 17, found on the periodic table in the group of halogens. It is a reactive gas under standard conditions and is commonly used for disinfection and in the production of various chemicals.
15.
The symbol for iron is____.
Correct Answer
Fe
Explanation
The symbol for iron is Fe. This is derived from its Latin name "Ferrum". The symbol Fe is used internationally to represent iron in the periodic table and in chemical equations.
16.
C2H3O2 is the chemical formula for _________.
Correct Answer
acetate
Acetate
Explanation
The chemical formula C2H3O2 represents the compound acetate. Acetate is a negatively charged ion that is derived from acetic acid. It is commonly found in many organic compounds and is used in various industries, such as pharmaceuticals and textiles. The formula can be written as either lowercase or uppercase, as both represent the same compound.
17.
The charge of iron is:
Correct Answer
D. +2 and +3
Explanation
Iron can exist in different oxidation states, meaning it can gain or lose electrons to form ions with different charges. In the case of iron, it commonly forms ions with a charge of +2 and +3. This is because iron can lose two electrons to form a Fe2+ ion, or it can lose three electrons to form a Fe3+ ion. Therefore, the correct answer is +2 and +3.
18.
The symbol F represents ________.
Correct Answer
fluoride, fluorine, Fluoride, Fluorine
19.
What is the name of NO2?
Correct Answer
nitrite
Nitrite
Explanation
The name of NO2 is nitrite. Nitrite is a compound that contains one nitrogen atom and two oxygen atoms. It is commonly used in various industrial processes and can also be found in some food products as a preservative. The capitalization of the first letter does not affect the chemical name, as both "nitrite" and "Nitrite" refer to the same compound.
20.
What is the name of OH?
Correct Answer
hydroxide
Hydroxide
Explanation
The correct answer for the question is "hydroxide" and "Hydroxide". In chemistry, OH- is called hydroxide ion. The lowercase "hydroxide" refers to the ion itself, while the uppercase "Hydroxide" refers to the name of the ion. Both spellings are correct and widely used in scientific literature.
21.
The symbol for sodium is ____.
Correct Answer
Na
Explanation
The symbol for an element is a shorthand representation used in chemistry to identify the element. In this case, the correct symbol for sodium is Na. This symbol is derived from the Latin word "natrium," which is the origin of the element's name. Sodium is a highly reactive metal that is commonly found in compounds such as table salt (sodium chloride). Its symbol, Na, is widely recognized and used in chemical equations and formulas.
22.
The symbol for potassium is _______.
Correct Answer
K
Explanation
The correct answer is K. The symbol for potassium on the periodic table is K. Each element is represented by a unique symbol, and in the case of potassium, it is represented by the letter K. This symbol is derived from the Latin word "kalium," which is the origin of the element's name.
23.
The name for ClO4 is ____.
Correct Answer
perchlorate
Perchlorate
Explanation
The correct answer for the name of ClO4 is "perchlorate" or "Perchlorate". The prefix "per-" indicates that there are four oxygen atoms bonded to the chlorine atom in the compound. Therefore, the name "perchlorate" accurately represents the composition of ClO4.
24.
The name for PO3 is ___.
Correct Answer
phosphite
Phosphite
Explanation
The correct answer for the name of PO3 is "phosphite" or "Phosphite." Phosphite is an ion that consists of one phosphorus atom bonded to three oxygen atoms. The name "phosphite" is derived from the element phosphorus, indicating its composition. The capitalization of the first letter in "Phosphite" is optional, as it does not affect the correctness of the answer.
25.
The charge of phosphate is:
Correct Answer
B. -3
Explanation
Phosphate is a polyatomic ion with a chemical formula of PO4^3-. The superscript 3- indicates that the ion has a charge of -3. This means that phosphate has gained three electrons, resulting in a negative charge.
26.
The name for ClO is ___.
Correct Answer
hypochlorite
Hypochlorite
Explanation
The correct answer is "hypochlorite" or "Hypochlorite." ClO is the chemical formula for hypochlorite, which is a negatively charged ion. It is commonly known as the hypochlorite ion and is used in various applications, such as disinfection and bleaching.
27.
The name for Cu is_____.
Correct Answer
copper
Copper
Explanation
The correct name for the element with the symbol Cu is copper. Copper is a chemical element with atomic number 29 and is known for its excellent electrical conductivity and corrosion resistance. It is commonly used in electrical wiring, plumbing, and various industrial applications. The capitalization of the word "Copper" in the answer does not affect its correctness as both "copper" and "Copper" refer to the same element.
28.
The name for Ba is ____.
Correct Answer
barium
Barium
Explanation
The correct answer is "barium" or "Barium". Ba is the chemical symbol for barium, which is a chemical element.
29.
The charge of Copper is __.
Correct Answer
E. +1 and +2
Explanation
Copper can have multiple charges depending on the chemical compound it is present in. It commonly forms compounds with a +2 charge, such as CuO or CuSO4. However, it can also form compounds with a +1 charge, such as CuCl or Cu2O. Therefore, the charge of copper can be both +1 and +2.
30.
The name of SO3 is __.
Correct Answer
sulfite
Sulfite
Explanation
The correct answer is sulfite. Sulfite is the name of the compound SO3. It is a polyatomic ion that consists of one sulfur atom and three oxygen atoms. Sulfite is commonly found in various chemical reactions and is used in industries such as food preservation and wine making. It is important to note that the answer is case-insensitive, so both "sulfite" and "Sulfite" are correct.
31.
The name of I is ___.
Correct Answer
iodide
Iodide
Explanation
The correct answer for this question is "iodide" or "Iodide". Both options refer to the same thing, which is the name of the element with the symbol "I". In chemistry, iodide refers to the negatively charged ion of iodine, which is commonly found in compounds and salts. Therefore, either "iodide" or "Iodide" can be used to correctly answer the question about the name of the element I.
32.
The charge of Ca is:
Correct Answer
D. +2
Explanation
The charge of a calcium (Ca) ion depends on the context. Calcium typically forms a Ca²⁺ ion, which means it loses two electrons to achieve a stable electron configuration.
The electron configuration of neutral calcium (Ca) is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s². By losing two electrons, it becomes Ca²⁺ with the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶, which is the same as the noble gas argon (Ar).
So, the charge of a typical calcium ion (Ca²⁺) is +2.
33.
The charge of ClO3 is:
Correct Answer
A. -1
Explanation
The charge of ClO3 is -1 because the overall charge of the ion is determined by the sum of the charges of its constituent atoms. In the case of ClO3, oxygen has a charge of -2 and there are three oxygen atoms, giving a total charge of -6. Since the overall charge of the ion is -1, the charge of the chlorine atom must be +5 to balance out the negative charge from the oxygen atoms, resulting in a net charge of -1 for the ClO3 ion.
34.
The name of O is ___.
Correct Answer
oxide
Oxide
Explanation
The correct answer is "oxide" or "Oxide" because the question is asking for the name of O, which is the chemical symbol for oxygen. When oxygen combines with another element, it forms an oxide compound. Hence, "oxide" or "Oxide" is the correct answer.
35.
The symbol of magnesium is:
Correct Answer
C. Mg
Explanation
The symbol of an element is a unique abbreviation used to represent it in the periodic table and chemical formulas. In this case, the correct symbol for magnesium is Mg.
36.
The charge of Zinc is:
Correct Answer
B. +2
Explanation
Zinc is a transition metal that belongs to Group 12 in the periodic table. The charge of zinc is commonly +2 because it loses two electrons to achieve a stable electron configuration. This is because zinc has two valence electrons in its outermost energy level, and it is energetically favorable for it to lose these two electrons and attain a full d subshell. Therefore, the correct answer is +2.
37.
The name of ClO3 is ___.
Correct Answer
chlorate
Chlorate
Explanation
The correct answer is "chlorate, Chlorate." The name of ClO3 is chlorate, which is spelled with a lowercase "c" and an uppercase "C". Chlorate is a polyatomic ion that consists of one chlorine atom bonded to three oxygen atoms. It has a -1 charge and is commonly found in compounds such as sodium chlorate (NaClO3) and potassium chlorate (KClO3).
38.
The charge of acetate is:
Correct Answer
C. -1
Explanation
Acetate is a polyatomic ion with a chemical formula of CH3COO-. The charge of acetate is -1 because it has gained one electron to achieve a stable octet configuration. The negative charge indicates an excess of electrons, making it an anion.
39.
The charge of NO3 is:
Correct Answer
D. -1
Explanation
The charge of NO3 is -1 because NO3 is a polyatomic ion called nitrate. It consists of one nitrogen atom (with a charge of +5) and three oxygen atoms (each with a charge of -2). In order for the overall charge of the nitrate ion to be neutral, the nitrogen atom must have a charge of -3. Therefore, the charge of NO3 is -1.
40.
The charge of ammonium is:
Correct Answer
B. +1
Explanation
Ammonium is a positively charged ion, consisting of one nitrogen atom and four hydrogen atoms. The nitrogen atom donates one electron to each of the four hydrogen atoms, resulting in a positive charge of +1 for the entire ammonium ion.
41.
The name of Br is __.
Correct Answer
bromide
Bromide
Explanation
The correct answer for the name of Br is bromide or Bromide.
42.
The name of Mg is ___.
Correct Answer
magnesium
Magnesium
Explanation
The correct answer is magnesium or Magnesium. Magnesium is the name of the element with the symbol Mg on the periodic table. It is a chemical element with atomic number 12 and is commonly found in various minerals. Magnesium is known for its lightness and is an essential element for many biological processes in plants, animals, and humans.
43.
The symbol for silver is ___.
Correct Answer
Ag
Explanation
The symbol for silver is Ag. This is derived from the Latin word "argentum," which means silver. The symbol Ag was chosen as an abbreviation for argentum to represent silver in the periodic table and chemical equations.
44.
The charge of Sr is:
Correct Answer
B. +2
Explanation
The charge of Sr is +2 because Sr is an alkaline earth metal and belongs to Group 2 of the periodic table. Group 2 elements have a valence electron configuration of ns2, meaning they lose two electrons to achieve a stable octet configuration. Therefore, Sr tends to lose two electrons and form a 2+ cation.
45.
The name for Li is ___.
Correct Answer
lithium
Lithium
Explanation
The correct answer is "lithium" or "Lithium". This is because "Li" is the chemical symbol for the element lithium. In the periodic table, chemical elements are represented by their symbol, and "Li" specifically refers to lithium. Therefore, "lithium" or "Lithium" is the correct name for "Li".