Q&A Hero

Physic

Q: The major division of chemistry that deals with what substances are present and in what quantities is called ______________chemistry.
Q: H3PO4 is the formula for _______________acid.
Q: The formula for sulfuric acid is _________________.
Q: The element ______________ is a soft, active metal and forms a compound called lye.
Q: The element ______________ is a purple-black solid that sublimes readily.
Q: Elements in which the outer shell contains 8 electrons are known as the ______________.
Q: The alkali metals have ______________ valence electron(s).
Q: The elements that hardly ever react with other elements to form compounds are called the ______________.
Q: The element ______________ displays some chemical properties of both Group 1A and Group 7A elements.
Q: The elements of Group ______________ are the most chemically active metals.
Q: The element ______________ was the gas used in the Hindenburg.
Q: The pale-green, gaseous element named ______________ was used as a poisonous gas in World War I.
Q: The compound BeF2 is named ______________.
Q: An atom or chemical combination of atoms with a net electric charge is called a(n) ______________.
Q: The numerals that follow the symbols in chemical formulas are called ______________.
Q: An aqueous solution of the colorless gas HCl is called ______________.
Q: The common name for NH3 is ______________.
Q: For an atom of 12Mg, the number of shells containing electrons is ______________.
Q: The vertical columns in the periodic table are called ______________.
Q: The electrons in the outermost shell are called ______________ electrons.
Q: The horizontal rows of the periodic table are called ______________.
Q: The second period of the periodic table is composed of ______________ (how many?) elements.
Q: Elements have similar chemical properties because they have the same number of electrons in their ______________.
Q: The amount of energy necessary to remove an electron from an atom is called that atom's ______________.
Q: The major credit for the development of the periodic table goes to a scientist named ______________.
Q: An element that tends to gain or share electrons during chemical reactions is classified as a(n) ______________.
Q: An element that tends to lose its valence electrons during chemical reactions is classified as a(n) ______________.
Q: Elements that display some properties of both metals and nonmetals are called ______________.
Q: In a given period, the element of Group ______________ has the lowest ionization energy.
Q: Over 99.9% of dry air at sea level is composed of the gases N2, O2, and ______________.
Q: The three allotropes of carbon are graphite, the fullerenes, and ______________.
Q: In a neutral atom, the number of protons is equal to the number of ______________.
Q: Hydrogen, nitrogen, and chlorine are among the elements that occur as molecules made up of ______________ atoms.
Q: Earth's atmosphere is 78% ______________.
Q: An electrically neutral particle composed of two or more atoms chemically combined is called a(n) ______________.
Q: O3 and O2 are the two ______________ of the element oxygen.
Q: The molecular formula of "buckyball" is ______________.
Q: Humphry Davy was able to discover six elements by using a new invention called the ______________.
Q: A(n) ______________ is a nonchemical combination of two or more substances in variable proportions.
Q: A(n) ______________ is a substance composed of two or more elements chemically combined in a definite, fixed proportion by mass.
Q: Matter can be defined as anything that ______________ ______________ and ______________ ______________.
Q: A solid solution of two or more metals is called a(n) ______________.
Q: Homogeneous mixtures are also called ______________.
Q: All specimens of a pure ______________ have identical properties and composition.
Q: Homogeneous mixtures are those mixtures that have variable but ______________ composition.
Q: ______________ are substances that cannot be decomposed by chemical processes.
Q: ______________ chemistry is the most fundamental of the five major divisions of chemistry.
Q: The shell electron configuration for an argon atom is ______________.
Q: Group ______________A elements have two valence electrons.
Q: The ______________ of a given solute is the amount of solute that will dissolve in a specified mass of solvent at a given temperature to produce a saturated solution.
Q: The second shell of an atom can hold a maximum of ______________ electrons.
Q: A solution that contains more dissolved solute than its normal solubility is called a(n) ______________ solution.
Q: A solution in which more of the solute could be dissolved at the same temperature is called a(n) ______________ solution.
Q: When salt is dissolved in water, the salt is called the ______________.
Q: The first shell of an atom can hold a maximum of how many electrons? A) 1 B) 2 C) 6 D) 8
Q: Which of the following is the shell electron configuration for carbon? A) 3, 3 B) 6 C) 2, 4 D) 1, 5
Q: An example of a diatomic molecule of an element is A) He B) N2 C) P4 D) CO
Q: The lesser amount of a substance in a solution is generally called the A) solute. B) salt. C) solvent. D) alloy.
Q: Which of the five major divisions of chemistry deals exclusively with carbon compounds? A) Physical chemistry B) Inorganic chemistry C) Analytical chemistry D) Organic chemistry E) Biochemistry
Q: An atom of chlorine has how many valence electrons? A) 1 B) 7 C) 4 D) 17
Q: Which of the following is the shell electron configuration for sulfur? A) 2, 4, 10 B) 10, 6 C) 2, 8, 6 D) None of these
Q: Generally, the solubility of gases in liquids increases with A) decreasing temperature and increasing pressure. B) increasing temperature and decreasing pressure. C) decreasing temperature and decreasing pressure. D) increasing temperature and increasing pressure.
Q: In a supersaturated solution, A) the solvent has become the solute. B) the normal solubility is exceeded. C) more solute than solvent is present. D) the dissolved and undissolved solute are in equilibrium.
Q: An equilibrium between solute dissolving and solute crystallizing is characteristic of which of the following solution types? A) Saturated B) Unsaturated C) Supersaturated D) Concentrated
Q: Homogeneous mixtures are A) heterogeneous mixtures. B) compounds. C) nonuniform mixtures. D) solutions.
Q: The element potassium should produce compounds most similar to those of A) Tc. B) Na. C) Al. D) Sr.
Q: Which of the following is the symbol for an alkali metal? A) Al B) Cl C) K D) Ca
Q: The Group 7A element astatine (85At) would be predicted to occur in what phase? A) Liquid B) Solid C) Plasma D) Gas
Q: Which element is used in safety flares and fireworks because it burns so brightly? A) Potassium B) Magnesium C) Carbon D) Chlorine
Q: Calcium carbonate is the major component of each of the following except A) limestone. B) seashells. C) stalagmites. D) bones.
Q: Hydrogen is generally classified as a A) semimetal. B) nonmetal. C) metal. D) noble gas.
Q: A compound of which element is used as a diet supplement to prevent thyroid problems? A) Chlorine B) Calcium C) Carbon D) Iodine
Q: The element barium should produce compounds most similar to those of A) sodium. B) nitrogen. C) carbon. D) calcium.
Q: The most reactive of all elements is A) hydrogen. B) fluorine. C) chlorine. D) sodium.
Q: Which group is the nearest neighbor to the noble gases in the periodic table? A) Noble gases B) Alkaline earth metals C) Halogens D) Alkali metals
Q: Atoms of which group of elements have seven electrons in the outer shell? A) Noble gases B) Alkali metals C) Alkaline earth metals D) Halogens
Q: Which of the following gases is monatomic? A) Nitrogen B) Argon C) Hydrogen D) Chlorine
Q: Which is the formula for baking soda? A) NaHCO3 B) NaOH C) (NH4)2 SO4 D) HC2H3O2
Q: What is the preferred name for Mg3N2? A) Magnesium trinitride B) Magnesium nitride C) Dimagnesium trinitride D) Manganese nitrate
Q: Which of the following polyatomic ions has a doubly negative charge? A) Acetate B) Sulfate C) Phosphate D) Ammonium
1 2 3 … 244

Subjects

Accounting Anthropology Archaeology Art History Banking Biology & Life Science Business Business Communication Business Development Business Ethics Business Law Chemistry Communication Computer Science Counseling Criminal Law Curriculum & Instruction Design Earth Science Economic Education Engineering Finance History & Theory Humanities Human Resource International Business Investments & Securities Journalism Law Management Marketing Medicine Medicine & Health Science Nursing Philosophy Physic Psychology Real Estate Science Social Science Sociology Special Education Speech Visual Arts