Q&A Hero

Q: Isotopes have the same number of ________ but different numbers of ________ in their nuclei.

Q: Atoms of the same element always have the same number of ________ in their nuclei.

Q: Sodium is an example of an ________ metal that reacts with water to form hydrogen gas and an ________ solution.

Q: The element Se can be found in period ________ and group ________ of the periodic table.

Q: The symbol for mercury is ________.

Q: In addition to a beta particle, what is the other product of beta decay of I?A) SbB) TeC) XeD) Cs

Q: Beta decay of 32P produces a beta particle and A) 28Al. B) 31P. C) 32Si. D) 32S.

Q: The number of nucleons in a Th nucleusis A) 90. B) 144. C) 234. D) 324.

Q: Copper has 2 naturally occuring isotopes, copper-63 with an atomic mass of 62.9296 and copper-65 with an atomic mass of 64.9279 amu. What is the percent abundance of copper-63? A) 69.2% B) 30.8% C) 51.8% D) 48.2%

Q: Identify the chemical symbol of element Q in Q. A) As B) Cl C) P D) S

Q: How many electrons are in a neutral atom of iodine-131? A) 1 B) 53 C) 54 D) 131

Q: What is the element symbol for an atom that has 33 protons and 41 neutrons? A) As B) Nb C) O D) W

Q: How many protons (p) and neutrons (n) are in an atom of calcium-46? A) 20 p, 26 n B) 20 p, 46 n C) 26 p, 20 n D) 46 p, 20 n

Q: How many protons (p) and neutrons (n) are in an atom of Tc? A) 43 p, 55 n B) 43 p, 98 n C) 55 p, 43 n D) 98 p, 43 n

Q: Which of the following represent isotopes? A: [ ] B: [ ] C: [ ] D: [ ] A) A and B B) A and C C) A and D D) C and D

Q: Which are isotopes? An atom that has an atomic number of 34 and a mass number of 76 is an isotope of an atom that has A) an atomic number of 32 and a mass number of 76. B) an atomic number of 34 and a mass number of 80. C) 42 neutrons and 34 protons. D) 42 protons and 34 neutrons.

Q: Elements A and Q form two compounds, AQ and A2Q3. The mass ratio (mass Q)/(mass A) for AQ is 0.286. What is the mass ratio (mass Q)/(mass A) for A2Q3? A) 0.191 B) 0.429 C) 2.33 D) 5.24

Q: A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium. How much calcium is contained in 30.0 g of calcium fluoride? A) 1.71 g B) 7.70 g C) 15.0 g D) 15.4 g

Q: A sample of pure lithium chloride contains 16.4% lithium by mass. What is the % lithium by mass in a sample of pure lithium carbonate that has twice the mass of the first sample? A) 8.20% B) 16.4% C) 32.8% D) 65.6%

Q: All of the following elements are nonmetals except A) arsenic. B) carbon. C) hydrogen. D) oxygen.

Q: Which one of the following elements is a poor conductor of heat and electricity? A) copper B) phosphorus C) iron D) lead

Q: Which of the following elements is a good conductor of heat and electricity? A) carbon B) chlorine C) neon D) silver

Q: Which of the following elements is classified as a semimetal? A) calcium B) silicon C) fluorine D) uranium

Q: Which of the following elements is not a solid at room temperature? A) Ag B) Al C) Ne D) Fe

Q: Which of the following elements is a gas at room temperature? A) bromine B) iron C) krypton D) sodium

Q: Which of the following elements has chemical properties similar to oxygen? A) fluorine B) hydrogen C) nitrogen D) sulfur

Q: Radium belongs to the ________ group of the periodic table. A) alkali metal B) alkaline earth metal C) halogen D) noble gas

Q: Xenon belongs to the ________ group of the periodic table. A) alkali metal B) alkaline earth metal C) halogen D) noble gas

Q: Fluorine belongs to the ________ group of the periodic table. A) alkali metal B) alkaline earth metal C) halogen D) noble gas

Q: Sodium belongs to the ________ group of the periodic table. A) alkali metal B) alkaline earth metal C) halogen D) noble gas

Q: Which element has the chemical symbol, Au? A) aluminum B) argon C) gold D) silver

Q: Which element has the chemical symbol, P? A) lead B) phosphorus C) platinum D) potassium

Q: What is the chemical symbol for platinum? A) P B) Pa C) Pt D) Pu

Q: What is the chemical symbol for manganese? A) Hg B) Mg C) Mn D) Na

Q: What is the chemical symbol for antimony? A) At B) Sb C) Sn D) Am

Q: What kind of decay process is occurring in the decay of isotope D to isotope E in the figure shown above?A) emissionB) emissionC) emissionD) electron capture or positron emission

Q: What kind of decay process is occurring in the decay of isotope C to isotope D in the figure shown above?A) emissionB) emissionC) emissionD) electron capture or positron emission

Q: What kind of decay process is occurring in the decay of isotope B to isotope C in the figure shown above?A) emissionB) emissionC) emissionD) electron capture or positron emission

Q: What kind of decay process is occurring in the decay of isotope A to isotope B in the figure shown above?A) emissionB) emissionC) emissionD) electron capture or positron emission

Q: Tell the type of decay process occurring in the following nuclear reaction.A) emissionB) emissionC) emissionD) electron capture or positron emission

Q: Tell the type of decay process occurring in the following nuclear reaction.A) emissionB) emissionC) emissionD) electron capture or positron emission

Q: Tell the type of decay process occurring in the following nuclear reaction.A) emissionB) emissionC) emissionD) electron capture or positron emission

Q: Tell the type of decay process occurring in the following nuclear reaction.A) emissionB) emissionC) emissionD) electron capture or positron emission

Q: Tell the type of decay process occurring in the following nuclear reaction.A) emissionB) emissionC) emissionD) electron capture or positron emission

Q: Tell the type of decay process occurring in the following nuclear reaction.A) emissionB) emissionC) emissionD) electron capture or positron emission

Q: Which of the following figures represents N? Unshaded spheres represent neutrons and shaded spheres represent protons. A) figure (1) B) figure (2) C) figure (3) D) figure (4)

Q: Which of the following figures represents B? Unshaded spheres represent neutrons and shaded spheres represent protons. A) figure (1) B) figure (2) C) figure (3) D) figure (4)

Q: The quantity 1.0567 qt rounded to two significant figures is ________ qt.

Q: ________ refers to how well a number of independent measurements agree with one another, whereas ________ refers to how close to the true value a given measurement is.

Q: The density of mercury is 13.6 g/cm3. The mass of 38.0 cm3 of mercury is ________ g.

Q: The density of lead is 11.3 g/cm3. The volume occupied by 227 g of lead is ________ cm3.

Q: The quantity 3.00 cm3 is the same as ________ mL.

Q: Volume is a derived unit having the dimensions (unit length)x, where x = ________.

Q: The differencebetween the boiling point and freezing point of water is 100C, which is ________ kelvins.

Q: Because of the high heat and low humidity in the summer in Death Valley, California, a visitor requires about one quart of water for every two miles traveled on foot. Calculate the approximate number of liters required for a person to walk 20. kilometers in Death Valley.A) 5.9 LB) 23 LC) 61 LD) 93 L

Q: A fishing boat accidentally spills 9.0 barrels of diesel oil into the ocean. Each barrel contains 42 gallons. If the oil film on the ocean is 2.5 102 nm thick, how many square meters will the oil slick cover? A) 5.7 10-3 m2 B) 5.7 106 m2 C) 5.7 107 m2 D) none of these

Q: Round off 807509 to four significant figures. A) 0081 B) 8076 C) 8100 D) 8.075 105

Q: A methane molecule contains 1 atom of carbon. The number 1 represents how many significant figures? A) one B) two C) three D) infinite

Q: How many significant figures are there in the answer for the following problem? = ? A) one B) two C) three D) four

Q: How many significant figures are there in the answer for the following problem? 57.5 + 0.9933 + 32 = ? A) one B) two C) three D) four

Q: How many of the following numbers contain 3 significant figures? 0.206 7.020 0.0200 7.03 1024 A) one B) two C) three D) four

Q: Which of the following numbers has the greatest number of significant figures? A) 0.8010 B) 0.504 C) 742000 D) 9.05 1024

Q: Calculate the kinetic energy of a 150-g baseball moving at a speed of 36. m/s (81 mph). K. E. = 1/2. A) 5.4 J B) 9.7 101 J C) 5.4 103 J D) 9.7 104 J

Q: A mass of mercury occupies 0.650 L. What volume would an equal mass of ethanol occupy? The density of mercury is and the density of ethanol is 0.789 g/mL. A) 0.0378 L B) 0.0896 L C) 11.2 L D) 26.4 L

Q: A laboratory procedure requires 4.67 g of a liquid whose density is 1.034 g/mL. What volume of liquid should be used for this procedure? A) 4.83 mL B) 4.52 mL C) 0.221 mL D) 5.70 mL

Q: A piece of metal ore weighs 9.00 g. When a student places it into a graduated cylinder containing water, the liquid level rises from 21.25 mL to 26.47 mL. What is the density of the ore? A) 0.340 g/mL B) 0.580 g/mL C) 1.72 g/mL D) 2.94 g/mL

Q: The factor 101 corresponds to which prefix? A) centi B) deci C) deka D) milli

Q: The factor 10 corresponds to which prefix? A) centi B) deci C) deka D) milli

Q: What symbol is used to represent the factor 10-2?A) MB) mC) D) c

Q: Which of the following is the smallest volume? A) 11 cm3 B) 0.25 dL C) 1.4 103 mL D) 2.5 107 nL

Q: Convert 45 m3 to liters. A) 4.5 10-2 L B) 4.5 L C) 4.5 102 L D) 4.5 104 L

Q: Convert 1000 cm3 to m3. A) 1 10-3 m3 B) 1 101 m3 C) 1 105 m3 D) 1 109 m3

Q: Which of the following volumes is equal to 20 mL? A) 20 cm3 B) 20 dm3 C) 0.20 L D) 0.00020 kL

Q: Which of the following is the lowest temperature? A) 72C B) 75F C) 348 K D) All of these temperatures are all equal.

Q: If the melting point of tungsten metal is 3422C, what is its melting point in Kelvin temperature? A) 1869 K B) 3149 K C) 3695 K D) 6192 K

Q: The diameter of the nucleus of an atom is approximately 1 10-15 m. If 1 nm is equal to 10 what is the diameter of the nucleus in A) 1 10-23 B) 1 10-8 C) 1 10-7 D) 1 10-5

Q: The diameter of an atom is approximately 1 10-10 m. What is the diameter in decimeters? A) 1 10-24 dm B) 1 10-21 dm C) 1 10-9 dm D) 1 10-6 dm

Q: The average distance between nitrogen and oxygen atoms is 115 pm in a compound called nitric oxide. What is this distance in decimeters? A) 1.15 10-10 dm B) 1.15 10-9 dm C) 1.15 1011 dm D) 1.15 1015 dm

Q: Convert 5 μm to meters. A) 5 10-9 m B) 5 10-6 m C) 5 10-3 m D) 5 106 m

Q: A student weighed 3000. μg of sulfur in the lab. This is the same mass as A) 3.000 10-6 g. B) 3.000 10-3 kg. C) 3.000 10-3 mg. D) 3.000 106 ng.