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C2h4f2 molar mass periodic table4/22/2024 and heat absorbed d) mass, density and final temperatureĪTOMIC STRUCTURE The nucleus of an atom: a) is composed of protons and neutrons b) is composed of protons and electrons c) occupies a large volume of the atom d) has no charge What is the smallest particle of an element that retains the properties of the element? a) an atom b) a molecule c) a proton d) an electron The sum of the protons and neutrons in an atom equals the: a) atomic number b) nucleus number c) mass number d) atomic mass Hydrogen-3 has _protons, _neutrons, and _electrons. 66 g/cm3 In order to find the specific heat of a substance, what information is required? a) mass and amount of heat absorbed b) amount of matter and temperature change c) mass, change in temp. a) both equal the value of 1 b) is a ratio of equivalent measurements c) has the same units d) all of the above How would the heat flow of 16.0 cal/sec be expressed in joules per hour? a) 241 J/hr b) 241 000 J/hr c) 2410 J/hr d) 2 410 000 J/hr e) 24 100 J/hr How many significant figures are in the measurement 0.0235 grams? a) 5 b) 4 c) 3 d) 2 What is the density of 3.0 grams of a substance with a volume of 2.0 mL? a) 1.5 g b) 1.5 g/cm3 c) 1.5 cm3 d). 0040cm b) 403m c) 92.00L d) 6.01g A temperature reading of -4.0oC corresponds to a Kelvin reading of a) 297.6 K b) 238 K c) 269 K d) 271 K Which of the following metric prefixes means 1000 times larger? a) kilo b) milli c) deka d) mega Express the following measurement in scientific notation, 0.005202g a) 5.20 x 102g b) 52.02 x 10-4g c) 5.202 x 10-3g d) 5.2 x 10-3g Express the product of 4.00 x 10-2 m X 8.1 x 102 m using the correct number of significant digits. SCIENTIFIC MEASUREMENT Which of the following measurements contains 2 significant figures? a). MATTER, ENERGY AND CHANGE According to the law of the conservation of atoms, the total mass of the reacting substances is a) always greater than the total mass of the products b) always less than the total mass of the products c) sometimes greater than the total mass of the products d) always equal to the total mass of the products Chemical equations : a) describe chemical reactions b) show how to write chemical formulas c) give directions for naming chemical compounds d) describe only biological changes Which of the following is a chemical property? a) color b) density c) freezing point d) reactivity with oxygen Chemistry is chiefly concerned with the study of which of the following types of changes in substances? a) changes in composition b) changes in shape c) changes in volume d) changes in mass If 14 atoms of carbon react with 28 atoms of oxygen to form the product carbon dioxide, how many atoms are contained in the carbon dioxide that is produced? a) 14 b) 21 c) 28 d) 42
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