What are the isotopes of hydrogen? 1 H, 2 H, and 3 H
The average mass of a boron atom is 10.81. Assuming you were able to isolate only one boron atom, the chance that you would randomly get one with a mass of 10.81 is 0%
Atoms of the same element having the same atomic number but different mass numbers are called isotopes
1. Which pair has approximately the same mass? A. a neutron and an electron B. an electron and a proton C. a hydrogen, 1 H, and a deuterium, 2 H, atom D. a proton and a neutron D. a proton and a neutron
The number of protons in the nucleus of an atom is called its atomic number
32 16 For the element sulfur, S, give the number of neutrons 16
What Kelvin temperature reading equals 98.6 F? 310. K
Round 0.006781 to two significant figures, and express it in scientific notation. 6.8 x 10-3
Convert: 801 K =? C. 528
Round 281,472 to three significant figures. 281,000
Convert: 4.96 kg =? mg. 4.96 x 10 6
Anything that has mass and volume is called matter
An element is a collection of a single kind of atom
Sand on the beach is an example of a heterogeneous mixture
A chemist needs 25.0 g of bromine for an experiment. What volume should she use? (Density of bromine = 3.12 g/cm 3.) 8.01 ml
Calculate the mass of a rectangular solid that has a density of 2.53 g/cm 3 and which measures 2.50 cm by 1.80 cm by 3.00 cm. 34.2 g
List the three main subatomic particles. electron; proton; neutron
The normal freezing point of water is A. 273 K B. 0 F C. 373 C D. 32 C E. None of the above A. 273 K
Which is larger, one calorie or one joule? one calorie
A chunk of sulfur has a volume of 7.73 cm 3. What is the mass of this sulfur? (Density of sulfur = 2.07 g/cm 3.) 16.0 g
The process of boiling off the water from a salt solution to recapture the salt is a process. physical
Calculate the heat given off when 177 g of copper cools from 155.0 C to 23.0 C. (The specific heat capacity of copper is 0.385 J/g C.) 9.00 x 10 4 J
If iodine melts at 114 C and boils at 184 C, what is its physical state at 98 C? solid
Assume that 372 J of heat is added to 5.00 g of water originally at 23.0 C. What would be the final temperature of the water? (Specific heat capacity of water = 4.184 J/g C.) 40.8 C
The heat of fusion of water is 334 J/g. Calculate the energy required to melt 46.8 g of water. 15.6 kj
Which of the following is a chemical change? A. paper burning B. sugar dissolving in water C. water boiling D. butter melting E. gasoline evaporating A. paper burning
What is the maximum number of electrons that can be put into the 4d subshell? 10
Identify the transition metal that has 24 electrons as a +3 ion Co
What is the maximum number of electrons that can be put into the 4f subshell? 14
Express the following in scientific notation. 0.00832 8.32 x 10-3
The element with the electron configuration [Kr]5s 2 4d 10 5p 3 is Sb
32 16 For the element sulfur, S, give the number of electrons 16
Express the following in scientific notation. 178,428 1.78248 x 10 5
How does magnesium compare with sodium in terms of the number of outer shell electrons? larger
Give the name and symbol for the element that has mass number 64 and 35 neutrons. copper, Cu
State the maximum number of electrons allowed in the third principal energy level 18
Which color of visible light has the most energy per photon? A. red B. yellow C. violet D. blue E. green C. violet
Which of the following is a reasonable criticism of the Bohr model of the atom? A. It does not adequately predict the ionization energy of the valence electron(s) for elements other than hydrogen. B. It does not adequately predict the line spectrum of hydrogen. C. It makes no attempt to explain why the negative electron does not eventually fall into the positive nucleus. D. It does not adequately predict the ionization energy of the firstenergy-level electrons for one-electron species for elements other than hydrogen. E. It shows the electrons to exist outside the nucleus. A. It does not adequately predict the ionization energy of the valence electron(s) for elements other than hydrogen.
The lowest possible energy state of an atom is called its state. A. neutral B. base C. excited D. ground E. None of the above D. ground
A packet of energy of electromagnetic radiation is called A. a wavelength B. a proton C. a photon D. a wave E. None of the above C. a photon
Write the electron configuration for Se. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 4 or [Ar]4s 2 3d 10 4p 4
What element has the electron configuration [Xe]6s 2 4f 14 5d 10 6p 2? A. Pb B. Sn C. Ba D. Po E. None of the above A. Pb
The maximum number of electrons allowed in each of the d orbitals is 2