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Density

Density. Solve the following problems: A block of maple wood with a volume of 405 cubic centimeters and a density of .67 g/cm 3 is sawed in half. The density of the two smaller blocks is now — A one-fourth the original density B one-half the original density

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Density

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  1. Density Solve the following problems: • A block of maple wood with a volume of 405 cubic centimeters and a density of .67 g/cm3 is sawed in half. The density of the two smaller blocks is now — A one-fourth the original density B one-half the original density C two times the original density Dthe same as the original density 2. What is the mass of a 500.00 mL sample of seawater with a density of 1.025 g/mL? • 487.8 g • 500.0 g • 512.5 g • 625.0 g 3. What is the density at 20°C of 12.0 milliliters of a liquid that has a mass of 4.05 grams? • 0.338 g/mL • 2.96 g/mL • 16.1 g/mL • 48.6 g/mL

  2. Lab Management 1. A student spills a chemical in the laboratory. What should he/she do first? A Clean it up. B Tell the teacher. C Let it evaporate. D Dilute the spill with water. 2. Eating in the laboratory — • is not permitted • is permitted if it is purchased in the cafeteria • is permitted if the lab experiment does not involve chemicals • is permitted as soon as the lab experiment is finished 3. What should be used to put out a fire in a person’s hair or clothing? A your hands B a fire blanket C a fire extinguisher D water from the sink faucet

  3. Matter 1. Which of the following is considered to be a chemical property of matter? • viscosity • reactivity • texture • density 2. Which of the following is a CORRECT statement regarding mixtures? • Mixtures are composed of a single substance. • Mixtures are composed of more than one substance. • Mixtures have a fixed composition. • All substances in a mixture are visible at all times. 3. An object is observed to have a silver color and a metallic appearance. The object is also found to have a mass of 11.34 grams and melts at 327.46°C. Of the observed properties listed below, which is considered to be an extensive property? • silver • metallic • mass • melting point

  4. Atomic Structure 1. The alpha particles in Rutherford’s experiments were used to — A identify chemical properties B identify the melting point C determine molecular mass D bombard sheets of gold 2. Which family correctly represents the elements in Group 1 on the periodic table? A transition metals B alkali series C lanthanide elements D actinide series 3. As the atomic number increases within a group of elements, the atomic radius usually — A. decreases B. remains the same as the one above it C. increases D. decreases, then increases

  5. Chemical Bonding 1. What is the electron configuration for manganese, atomic number 25? A 1s2 2s2 2p6 3s2 3p6 4s2 3d5 B 1s2 2s2 2p6 3s2 3p6 4s2 3d10 C 1s2 2s2 2p6 3s2 3p6 4s2 D 1s2 2s2 2p6 3s2 3p6 2. A property of some metals is the ability to be drawn into a wire. This is called — A malleability B ductility C permeability D conductivity 3. Which of the 2 outermost orbitals MUST BE FILLED to satisfy the octet rule? A d and f orbitals B d and p orbitals C s and d orbitals D s and p orbitals

  6. Chemical Formulas 1. What is the formula for barium nitrate? • Ba(NO3)2 • BaNO2 • Ba2NO3 • Ba(NO4)2 2. What is the name of the compound AlPO4? A aluminum phosphide B aluminum phosphate C aluminum phosphite D aluminum phosphoroxide 3. What is the name of the compound N2O3? • sodium dioxide • dinitrogen oxide • nitrous oxide • dinitrogen trioxide

  7. The Mole 1. How many Mg2+ ions are found in 1.00 mol of MgO? A. 3.01 x 1023 B. 12.04 x 1023 C. 6.02 x 1023 D. 6.02 x 1025 2. How many grams of NaCl are present in 11.00 moles? • 0.4500 g • 156.6 g • 331.0 g • 642.9 g 3. What is the molar mass of MgSO4? A 116.13 amu B 272.83 amu C 111.21 amu D 120.37 amu

  8. Chemical Reactions 1. Which coefficients are required to correctly balance the equation, C2H2 + O2 → CO2 + H2O? • 1, 2, 3, 2 • 2, 5, 4, 2 • 2, 4, 5, 2 • 2, 3, 5, 2 2. According to the Law of Conservation of Matter, the total mass of all the reacting substance is — • more than the mass of all the products • more than the total mass of all the products and the reactants • less than the total mass of all the products • equal to the mass of all the products 3. Which of the following reactions involves one element replacing an element in a compound that is from the same activity series? A combustion reaction B decomposition reaction C single replacement reaction D double replacement reaction

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