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| 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 |
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| discarding data inconsistent with the hypothesis |
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| All of the following are examples of units (weight, kilometer, gram, teaspoon) except |
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| All but one of these units are SI base units (kilogram, second, liter, Kelvin). The exception is the ________ |
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| A quantity that describes the concentration of matter is |
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| A measure of the Earth's gravitational pull on matter is |
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| Two variables are directly proportional if their _______ has a constant value. |
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| The graph of a direct proportion is a(n) ________ |
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| The las of conservation of mass follows the concept that |
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| matter is composed of atoms |
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| The law of multiple proportions can be partly explained by the idea that ______ |
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| elements in a compound always occur in a 1:1 ration |
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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. |
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| Atoms of the same element may have different masses. |
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| Experiments with cathode rays led to the discovery of the ________ |
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| The discovery of the electron resulted from experiments using |
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| Who discovered the nucleus by bombarding gold foil with positively charged particles and noting that some particles were widely deflected? |
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| An atom is electrically neutral because ________ |
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| the numbers of protons and electrons are equal |
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| Isotopes of an element contain different numbers of |
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| As the mass number of the isotopes of an element increases, the number of protons ______________ |
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| As the atomic number increases, the number of electrons in an atom |
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| All atoms of the same element have the same __________________ |
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| The period of an element can be determined from its _____________ |
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The first member of the noble gas family, whose highest energy level
consists of an octet of electrons, is |
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| The alkali metals belong to the _________________ -block in the periodic table. |
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| Valence electrons are those _____________ |
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| in the highest energy level |
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| The number of valence electrons in Group 1A elements iS |
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| A metallic bond forms when positive ions attract |
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| The electron-sea model of the metallic bond helps to explain why metals are |
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| The oxidation number of fluorine is |
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| An electrically neutral atom of mercury has |
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| 80 protons and 80 electrons |
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An atom of potassium has 19 protons and 20 neutrons. What is its mass
number? |
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| What is the oxidation number of carbon in C1 4 ? |
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| In a polyatomic ion, the algebraic sum of the oxidation numbers of all atoms is equal to ___________________ |
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| The most reactive group of the nonmetals are the ________________ |
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| In a row in the periodic table, as the atomic number increases, the atomic radius generally |
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| A negative ion is known as ______________. |
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| A positive ion is known as ________________. |
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| When an electron is acquired by a neutral atom, the energy change is called ______________. |
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| The energy required to remove an electron from an atom is the atom's ___________. |
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A measure of the ability of an atom in a chemical compound to attract
electrons is called ____________. |
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| The element that has the greatest electronegativity is ______________. |
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| One-half the distance between the nuclei of identical atoms that are bonded together is called __________________. |
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| In the alkaline earth group, atoms with the smallest radii ______________. |
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| have the highest ionization energies |
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| The electrons available to be lost, gained, or shared when atoms form molecules are called _______________. |
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| The chemical bond formed when two atoms share electrons is called a(n) |
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| A chemical bond resulting from the electrostatic attraction between positive and negative ions is called an) |
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| Most chemical bonds are ________________. |
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| partly ionic and partly covalent |
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| A neutral group of atoms held together by covalent bonds is a ______________. |
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| All of the following are true statements about a molecule except _______________. |
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| 1t may consists of two or more atoms of different types |
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What principle states that atoms tend to form compounds so that each atom
can have eight electrons in its outermost energy level? |
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