Shared Flashcard Set

Details

Study Cards for Physical Science
Study Cards for Physical Science
50
Science
9th Grade
12/14/2012

Additional Science Flashcards

 


 

Cards

Term
All of the following are steps in the scientific method (Observing and recording data, forming a hypothesis, discarding the data inconsistent with the hypothesis, developing a model) except
Definition
discarding data inconsistent with the hypothesis
Term
All of the following are examples of units (weight, kilometer, gram, teaspoon) except
Definition
weight
Term
All but one of these units are SI base units (kilogram, second, liter, Kelvin). The exception is the ________
Definition
Kelvin
Term
The symbol mm represents
Definition
millimeter
Term
A quantity that describes the concentration of matter is
Definition
mass
Term
A measure of the Earth's gravitational pull on matter is
Definition
weight
Term
Two variables are directly proportional if their _______ has a constant value.
Definition
product
Term
The graph of a direct proportion is a(n) ________
Definition
straight line
Term
The las of conservation of mass follows the concept that
Definition
matter is composed of atoms
Term
The law of multiple proportions can be partly explained by the idea that ______
Definition
elements in a compound always occur in a 1:1 ration
Term
Which of the following statements is true?

a) Atoms of the same element may have different masses.
b) Atoms may be divided in ordinary chemical reactions.
c) Atoms can never combine with any other atoms.
d) Matter is composed of large particles called atoms.
Definition
Atoms of the same element may have different masses.
Term
Experiments with cathode rays led to the discovery of the ________
Definition
proton
Term
The discovery of the electron resulted from experiments using
Definition
alPha particles
Term
Who discovered the nucleus by bombarding gold foil with positively charged particles and noting that some particles were widely deflected?
Definition
Rutherford
Term
Protons have
Definition
no mass
Term
An atom is electrically neutral because ________
Definition
the numbers of protons and electrons are equal
Term
Isotopes of an element contain different numbers of
Definition
neutrons
Term
As the mass number of the isotopes of an element increases, the number of protons ______________
Definition
remains the same
Term
As the atomic number increases, the number of electrons in an atom
Definition
increases
Term
All atoms of the same element have the same __________________
Definition
atomic number
Term
The period of an element can be determined from its _____________
Definition
electron configuration
Term
The first member of the noble gas family, whose highest energy level
consists of an octet of electrons, is
Definition
helium
Term
The alkali metals belong to the _________________ -block in the periodic table.
Definition
s
Term
Valence electrons are those _____________
Definition
in the highest energy level
Term
The number of valence electrons in Group 1A elements iS
Definition
1
Term
A metallic bond forms when positive ions attract
Definition
nObile electrons
Term
The electron-sea model of the metallic bond helps to explain why metals are
Definition
malleable
Term
The oxidation number of fluorine is
Definition
-1 in all compounds
Term
An electrically neutral atom of mercury has
Definition
80 protons and 80 electrons
Term
An atom of potassium has 19 protons and 20 neutrons. What is its mass
number?
Definition
39
Term
What is the oxidation number of carbon in C1 4 ?
Definition
+4
Term
In a polyatomic ion, the algebraic sum of the oxidation numbers of all atoms is equal to ___________________
Definition
the charge of the ion
Term
The most reactive group of the nonmetals are the ________________
Definition
halogens
Term
In a row in the periodic table, as the atomic number increases, the atomic radius generally
Definition
decreases
Term
A negative ion is known as ______________.
Definition
anion
Term
A positive ion is known as ________________.
Definition
cation
Term
When an electron is acquired by a neutral atom, the energy change is called ______________.
Definition
electron affinity
Term
The energy required to remove an electron from an atom is the atom's ___________.
Definition
ionization energy
Term
A measure of the ability of an atom in a chemical compound to attract
electrons is called ____________.
Definition
electronegativity
Term
The element that has the greatest electronegativity is ______________.
Definition
fluorine
Term
One-half the distance between the nuclei of identical atoms that are bonded together is called __________________.
Definition
atomic radius
Term
In the alkaline earth group, atoms with the smallest radii ______________.
Definition
have the highest ionization energies
Term
The electrons available to be lost, gained, or shared when atoms form molecules are called _______________.
Definition
valence electrons
Term
The chemical bond formed when two atoms share electrons is called a(n)
Definition
covalent bond
Term
A chemical bond resulting from the electrostatic attraction between positive and negative ions is called an)
Definition
ionic bond
Term
Most chemical bonds are ________________.
Definition
partly ionic and partly covalent
Term
A neutral group of atoms held together by covalent bonds is a ______________.
Definition
molecule
Term
All of the following are true statements about a molecule except _______________.
Definition
1t may consists of two or more atoms of different types
Term
An octet is equal to
Definition
8
Term
What principle states that atoms tend to form compounds so that each atom
can have eight electrons in its outermost energy level?
Definition
octet rule
Supporting users have an ad free experience!