Flashcards
Chemistry I
Flashcards do conjunto (53)
- 1Label Parts
- 2Two variables are directly proportional if their___ has a constant valuequotient
- 3What is a quotient?a degree or amount of a specified quality or characteristic
- 4What does "k" represent?The constant of proportionality. It will be a number that relates the two variables together.
- 5What does "product" mean?The result of multiplying two or more numbers together
- 6What does "sum" mean?The result by adding two or more numbers
- 7y = kxThe x value is directly proportional to the y value
- 8xy = k or x = k/yThe equation(s) for inverse proportion. Therefore, to find the value of the constant "k," plug in the known values and use this formula to calculate all unknown values
- 9Two quantities that are in direct proportion will always produce a ____ graph that passes through the originstraight-line
- 10_______ show that the quantities are in inverse proportionHyperbola graphs
- 11Law of multiple proportionswhen two elements combine to form more than one compound, the combined, fixed, weights of the elements are in a ratio of small whole numbers
- 12Law of conservation of massmass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations
- 13Law of Definite Proportionsa chemical compound is always found to be made up of the same elements combined together in the same fixed proportion by mass
- 14Avogadro's number6.022 x 10^23
- 15Define Avogadro's numberThe number of elementary particles (molecules, atoms, compounds, etc.) per mole of a substance in any pure substance
- 16When dividing with scientific notation, you ____ the notationssubtract
- 17When multiplying with scientific notation, you ____ the notationsadd
- 18Grams to Moles
- 19Average Atomic Mass(of an element) the sum of the masses of its isotopes, each multiplied by its natural abundance
- 20Hyphen notation for Isotopes
- 21J.J. Thomson's experiments with cathode-ray tubes showed that all atoms contain tiny ______electrons
- 22After measuring the ratio of the charge of a cathode-ray particle (electron) to its mass, Thomson concluded that ___________the particles (electrons) had a very small mass
- 23The principles of atomic theory recognized today were conceived by ______Dalton
- 24Who discovered the nucleus in which experiment?Rutherford in the gold foil experiment
- 25A positively charged particle with mass 1.673x10-24g is a ______proton
- 26List the three isotopes of the element hydrogenhydrogen
deuterium
tritium - 27List the number of neutrons in the hydrogen isotopeshydrogen = 0
deuterium = 1
tritium = 2 - 28An atom is electrically neutral because ___the numbers of protons and electrons are equal
- 29The law of definite proportionsagrees with Dalton's atomic theory
- 30All hydrogen isotopes have ____one proton
and
one electron - 31In early experiments on electricity and matter, an electrical current was passed through a glass tube containinggas under low pressure
- 32In a glass tube attached to a voltage source, electrical current passes from the negative electrode, called the ____, to the other electrodecathode
- 33When an electrical current passed through a glass tube, it caused the surface of the tube directly across from the cathode to glow. Scientists concluded that _______the particles of the beam were negatively charged
- 34The rays produced in a cathode tube aredeflected away from a negative plate
- 35Experiments with cathode rays led to the discovery of theelectron
- 36The deflection of cathode rays in Thomson's experiments was evidence of the ____ nature of electronscharged
- 37In Rutherford's experiments, alpha particles _______were used to bombard thin metal foil
- 38In Rutherford's experiments, most of the particles _____passed through the foil
- 39Because a few alpha particles bounced back from the foil, Rutherford concluded that they wererepelled by densely packed regions of positive charge
- 40Rutherford's experiments led him to conclude that atoms contain massive central regions that have _______a positive charge
- 41Which part of an atom has a mass approximately equal to 1/2000 of the mass of a common hydrogen atom?electron
- 42Protons within a nucleus are attracted to each other by ______the nuclear force
- 43Nuclear forces exists because the particles in the nucleus are ____close together
- 44The most common form of hydrogen has _____no neutrons
- 45All isotopes of hydrogen containone proton
- 46The total number of protons and neutrons in the nucleus of an atom is its _____mass number
- 47The carbon-12 atom is assigned a relative mass of exactly12 amu
- 48The average atomic mass of an element ________may not equal the mass of any of its isotopes
- 49The atomic number of neon is 10. The atomic number of calcium is 20. Compared with a mole of neon, a mole of calcium contains ______an equal number of atoms
- 50To determine the molar mass of an element, one must know the element'saverage atomic mass.
- 51Molar Massis the mass in grams of one mole of a substance and is numerically equal to the average atomic mass of the element
- 52The mass of 2.0 mol of oxygen atoms (atomic mass 16.00 amu) is32 g
- 53The atomic mass of an element is measured in _____atomic mass unit (amu)
Informações
- Descrição
- 10th grade Chemistry FlashCards sobre Chemistry I, criado por Christmas Moore em 07-11-2020.
- Criado por
- Christmas Moore
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