Section 1
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What charge would you expect to find on a selenide ion?
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Cards (76)
Section 1
(50 cards)
What charge would you expect to find on a selenide ion?
-2
Mendeleev is given the most credit for the concept of a periodic table of the elements because:
He emphasized its usefulness in predicting the existence and properties of unknown elements.
The Greeks proposed that matter consisted of four fundamental substances:
fire, earth, water, air
In an experiment searching for the photoelectric effect, an incident beam of green light produced no ejected electrons from a metal. In order to eject electrons, the experimenter should
try blue light.
How many of the following postulates of Dalton's atomic theory are still scientifically accepted? I. All atoms of the same element are identical. II.Compounds are combinations of different atoms. III.A chemical reaction changes the way atoms are grouped together. IV. Atoms are indestructible.
2
How many protons and electrons are present in a Ca2+ ion?
20 protons, 18 electrons
In Bohr's atomic theory, when an electron moves from one energy level to another energy level more distant from the nucleus:
Energy is absorbed
What is the wavelength of a photon of red light (in nm) whose frequency is 4.56 × 1014 Hz?
657 nm
Generally, observed behavior that can be formulated into a statement, sometimes mathematical in nature, is called a(n)
natural law
What is the correct symbol for silver?
Ag
Consider the following two compounds: H2O and H2O2. According to the law of multiple proportions, the ratio of hydrogen atoms per gram of oxygen in H2O to hydrogen atoms per gram of oxygen in H2O2 is
2:1
Which of the following is NOT a feature of Thompson's "Raisin Pudding" model of the atom?
The presence of a nucleus
In a Millikan oil-drop experiment, the charges on several different oil drops were as follows: -5.92; -4.44; -2.96; -8.88. The units are arbitrary. What is the likely value of the electronic charge in these arbitrary units?
-1.48
Which of the following is not determined by the principal quantum number, n, of the electron in a hydrogen atom?
The shape of the corresponding atomic orbital(s).
The AM station KPUE plays your favorite music from the 20's and 30's at 1290 kHz. Find the wavelength of these waves.
232 m
How many protons and electrons are present in a Br- ion?
35p, 36 e
The first people to attempt to explain why chemical changes occur were
The Greeks
An element has the electron configuration [Kr] 5s24d105p2. The element is a(n)
metal
When ignited, a uranium compound burns with a green flame. The wavelength of the light given off by this flame is greater than that of
ultraviolet light
Electromagnetic radiation can be viewed as a stream of "particles" called __________.
photons
Wherever it is found, water always contains oxygen and hydrogen in the mass ratio of 8 to 1. Taken by itself, this fact demonstrates what natural law?
Definite Composition
Who was the first scientist to propose that the atom had a dense nucleus which occupied only a small fraction of the volume of the atom?
Rutherford
An iron-56 nucleus contains
26 protons and 30 neutrons
There are only three types of radioactivity known to scientists today.
There are only three types of radioactivity known to scientists today.
J. J. Thomson studied cathode ray particles (electrons) and was able to measure the mass/charge ratio. His results showed that
matter included particles much smaller than the atom.
True or false? A 2p orbital is more penetrating than a 2s; i.e., it has a higher electron density near the nucleus and inside the charge cloud of a 1s orbital
false
Rutherford's experiment with alpha particle scattering by gold foil established that
protons are not evenly distributed throughout an atom.
What keeps the electrons from leaving an atom in the Rutherford model of the atom?
strong electrostatic attraction to the nucleus
Which subatomic particle was found to be present in cathode rays?
electrons
How many electrons in an atom can have the quantum numbers n = 3, l = 2?
10
How many protons (p), neutrons (n) and electrons (e) are there, respectively, in a chlorine-39 isotope?
17 p, 22 n, 17 e
An atom containing 34 protons, 43 neutrons, and 34 electrons would have the symbol:
77Se
Given the following electronic configuration of neutral atoms, identify the element and state the number of unpaired electrons in its ground state. Example: [He]2s1 Answer: Li, 1
Cl, 1
A chemical theory that has been known for a long time becomes a law.
False
Which of the following experiments disproved Thompson's "raisin pudding" model of the atom?
Rutherford's Gold-Foil Experiment
Which of the following statements is/are CORRECT? 1. Atoms are the smallest particles of an element that retain the element's chemical properties. 2. Substances composed of only one type of atom are classified as elements. 3. Of the 118 known elements, only 48 occur naturally.
1 and 2
What component of atoms was discovered by Rutherford?
nucleus
An atom of the isotope chlorine-39 consists of how many protons, neutrons, and electrons? (p = proton, n= neutron, e = electron)
17 p, 22 n, 17 e
From the following list of observations, choose the one that most clearly supports the following conclusion: a) emission spectrum of hydrogen b) the photoelectric effect c)scattering of alpha particles by metal foil d)diffraction e)cathode "rays" Electromagnetic radiation has wave characteristics.
observation d
Who is credited with measuring the mass/charge ratio of the electron?
Thomson
Ti has __________ in its d orbitals.
2 electrons
According to the law of multiple proportions
none
What is the identity of element Q if the ion Q2+ contains 10 electrons?
Mg
The first chemist to perform truly quantitative experiments was
Boyle
Consider the following portion of the energy-level diagram for hydrogen: n = 4 -0.1361 × 10-18 J n = 3 -0.2420 × 10-18 J n = 2 -0.5445 × 10-18 J n = 1 -2.178 × 10-18 J For which of the following transitions does the light emitted have the longest wavelength?
n = 4 to n = 3
The chemist credited for inventing a set of symbols for writing elements and a system for writing the formulas of compounds (and for discovering selenium, silicon, and thorium) is
Berzelius
Who is credited with discovering the atomic nucleus?
Rutherford
A sample of chemical X is found to contain 5.0 grams of oxygen, 10.0 grams of carbon, and 20.0 grams of nitrogen. The law of definite proportion would predict that a 61 gram sample of chemical X should contain how many grams of carbon?
17 g
What is the mass number of an isotope of mercury, Hg, that has 122 neutrons?
202
True or False? Scientists believe that solids are mostly open space.
True
Section 2
(26 cards)