Question

D How many moles and how many molecules of zinc chloride are in a weighing 89.5 g? A) 0.432 mol, 2,60 x10-24 molecules B) 0,887 mol, 5.34 x 1023 molecules C)0657 mol, 4.0 x 1023 molecules D) 0.887 mol, 4.0 x 1024 molecules 8) Which of the following underlined items is not an intensive property? A)A chemical reaction requires 3.00 g of oxygen. )Solid copper hydroxide is blue colored C) The density of heliumm at 25 C is 1.64 x 10-4 g/em melting point of aluminum metal is 933 K D) The 9) The diameter 10 Angstroms w orthe nces of an atom is approximately 1 10-15 meters. If 1 nm is equal to A-2theaeter of the nucleus in Angstroms? A) 1 × 10-23 A B) 1 10-8 A C) 1 10-7A D) 1 x 10-5A 10) A gold ingot weighs 5.00 Ibs. If the density of gold is 19.31 g/em3, and the length and width y, what is the height of the ingot? of the ingot are 12.0 em and 4.00 cm respectivel A) 6.50 × 10-3 cm B) 3.59 cm C) 2.45 cm D) 1.34 x 103 cm 11) A student measured the diameter of a sphere and determined the average value. His measurements are 5.17 cm, 5.16 cm, 5.16 cm, and 5.17 cm. If the true diameter is 6.18 cm, what can be said about the student's results? A) It is accurate and precise. B) It is accurate but not precise. C) It is precise but not accurate. D) It is neither precise nor accurate. 12) What is the de Broglie wavelength of an electron (m-9,11 10-31 kg) moving at a velocity of3.0 x 107 m/s? de Broglie equation : λ-h/mv. where Planck's constant, h- 6.626 x 10 kg m/s. A) less than 3.9 × 10-12 m B) 2.4 x 10-11m C) 3.3 x 10-8 m D) greater than 1.1 x 10-4m

Answer 1

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