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### 42 Cards in this Set

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 5.21 cm is the same distance as ________. A) 0.0521 m The number 680 000 000 expressed correctly using scientific notation is ________. C) 6.8 x 10 8 The measurement 0.000 043 m, expressed correctly using scientific notation, is ________. D) 6.8 x 10 -5 Significant figures are important because they indicate ________. D) the accuracy of a measurement Which of the following measurements are NOT equivalent? B) 183 L = 0.183 kL A calculator answer of 423.6059 must be rounded off to three significant figures. What answer is reported? B) 424 Which of the following is the largest unit? E) kilometer What is the metric relationship between grams and micrograms? B) 1 g = 1 000 000 μg The ratio of the mass of a substance to its volume is its ________. B) density D=M/V Which one of the following substances will float in gasoline, which has a density (d) of 0.66 g/mL? B) balsa wood (d = 0.16 g/mL) Compounds can be broken down into their elements by ________. E) chemical processes a firecracker explodes, giving off light and heat, and breaking the wrapper into many pieces, ________. C) both a physical and a chemical change are taking place An example of kinetic energy is ________. B) running water Which of the following is an example of potential energy? B) water stored in a reservoir In which of the following would the particles move most rapidly? C) steam at 110 °C The energy stored in the chemical bonds of a molecule is ________. C) potential energy The specific heat of a substance is the amount of heat needed to B) raise the temperature of 1 g of the substance by 1 °C. One calorie is required to raise the temperature of A) 1 g of water by 1.0 °C. Which of the following is a characteristic of the modern periodic table? C) The elements in each group have similar chemical properties. What is the symbol of the element in Period 4 and Group 2A(14)? C) Ca In an atom, the nucleus contains ________. B) all the protons and neutrons Which of the following gives the correct numbers of protons, neutrons, and electrons in a neutral atom of 118 50 SN ? C) 50 protons, 68 neutrons, 50 electrons The elements lithium, sodium, and potassium ________. D) are in the same group Isotopes are atoms of the same element that have ________. D) the same atomic number but different numbers of neutrons All electromagnetic radiation travels at the same ________. A) velocity Atomic emission spectra are due to electrons C) in an atom dropping from one energy level to a lower one. When energy is absorbed by an atom, an electron A) moves from a lower to a higher energy level. An s orbital can hold ________ electrons. D) 2 Any p orbital can hold up to ________ electrons. A) 6 Any d orbital can hold up to ________ electrons. D) 10 According to the Pauli exclusion principle, any orbital can hold at most ________ electrons A) 2 What element has the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d6 ? A) Fe Add coefficients or count across periodic table What is the electron configuration for aluminum? A) 1 s2 2 s2 2 p6 3 s2 3 p1 Add coefficients or count across periodic table The atomic radius of potassium is smaller than the atomic radius of ________. A) cesium Valence electrons are electrons located A) in the outermost energy level of an atom One element that has 7 valence electrons is ________. A) bromine The number of electromagnetic waves that travel past a certain point in a given time is the ________ of the radiation. A) frequency A nugget of gold with a mass of 521 g is added to 50.0 mL of water. The water level rises to a volume of 77.0 mL. What is the density of the gold? E) 19.3 g/mL 521/27 D=M(grams) / V(ML)= A dose of aspirin of 5.0 mg per kilogram of body weight has been prescribed to reduce the fever of an infant weighing 8.5 pounds. The number of milligrams of aspirin that should be administered is ________ *Note: 1kg= 35.28 oz and 1lb = 16 oz. A) 19 mg 136oz x 1kg ---------- ------- =3.85 kg x5 = 19.27 1 35.28oz What is the mass of 2.00 L of a solution with a density of 1.15 g/mL? B) 2.30 kg 1.15=x/2000 d=M(g)/V(ml) 2.00 L = 2000 ml 2x1000 1.15x2=2.30 kg How many kilojoules are required to raise the temperature of a 150. g sample of silver from 25 °C to 135 °C? Silver has a specific heat of 0.235 J/g °C. SH = ___energy___ Mass x ∆T C) 3.88 kJ delta T=T2-T1=135-25 .235=Energy(J)/150x110 38.77.5J/1000= 3.8KJ The electromagnetic spectrum is a continuum which has low energy radio waves on one end and high energy gamma rays on the other. Compared to gamma rays, radio waves have A) lower frequencies and higher wavelengths.