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Chemistry DUT 1
Chemistry Test 1
Question | Answer |
---|---|
Matter is composed of extremely small particles, too small to be seen with a classroom microscope, called ____ | atoms |
Atoms | the smallest part of an element that has the chemical properties of the element. |
Matter | anything that has mass and takes up space. |
Matter can be classified on the basis of its ___ | composition |
Elements | pure substances that cannot be changed into simpler substances |
Elements are composed of ___ kind of atom | one |
Compounds | pure substances that are composed of two or more types of elements that are chemically combined. |
Compounds can only be changed into simpler substances called elements by ___ changes | chemical |
Molecule | formed by combining two or more atoms |
Mixture | composed of two or more different substances that retain their own individual properties and are mixed together. |
Mixtures can be separated by ___ means | physical |
Types of physical separation | filtration, sifting, or evaporation |
___ can be heterogenous or homogenous | Mixtures |
Heterogenous Mixture | a mixture that is not uniform throughout, the component substances can be visibly distinguished. |
Homogenous Mixture | a mixture that is uniform throughout, the substances are evenly mixed and cannot be visibly distinguished. |
Solution | another name for a homogenous mixture |
Luster, Conductors, Malleable, Ductile, High Density | Physical properties of metals |
Luster | Having a shiny surface or reflecting light brightly |
Conductors | Heat and electricity move through them easily |
Malleable | Ability to be hammered into different shapes |
Ductile | Ability to be drawn into a wire |
High Density | Heavy for their size |
Dull, Nonconductor, Brittle | physical properties of nonmetals |
Dull | not shiny |
Nonconductor | Heat and electricity do not move through them easily |
Brittle | solids that break or shatter easily |
Periodic Table | used to identify the basic organization of elements. |
Period | a horizontal row on the periodic table |
The elements on the periodic table are arranged numerically by ___ ___ | atomic numbers |
Family | vertical columns of elements on the periodic table (also called groups) |
Elements in the same ___ have similar properties | family |
Metals | A major classification of elements generally located on the left side of the zigzag line on the periodic table. |
Examples of metals | Sodium, Calcium, Iron, and Aluminum. |
Nonmetals | A major classification of elements generally located on the right side of the zigzag line on the periodic table |
Examples of nonmetals | Chlorine, Oxygen, Sulfur, and Iodine |
Chemical Symbol | shows the atoms of the elements composing a substance. |
___ are written with one, two, or three letters | Symbols |
Na | Sodium |
Cl | Chlorine |
H | Hydrogen |
O | Oxygen |
C | Carbon |
N | Nitrogen |
___ are made up of one kind of atom and the symbol for each element is unique | elements |
___ are composed of more than one element and their formulas have more than one type of symbol showing the different elements that compose the compound | Compounds |
Chemical Formula | constructed from the symbols of the elements composing the substances |
Subscript | a number that shows how many of each kind of atom are in the compound |
The subscript is written to the lower ___ of the element symbol | right |
NaCl | table salt |
H2O | water |
C6H12O6 | glucose |
O2 | oxygen gas |
CO2 | carbon dioxide |
N2 | Nitrogen |
Chemical reaction | When a substance is broken apart or when substances are combined and at least one new substance is formed. |
Chemical equation | Used to represent a chemical reaction that has occurred; it contains the chemical names or the chemical formulas of the substances that are involved in the reaction. |
In a chemical equation, the arrow can be translated as ______ or _______. | yields or makes |
Reactant | Substances broken apart or combined in a chemical reaction and are located on the left side of the arrow. |
Product | New substances formed in a chemical reaction and are located on the right side of the arrow. |
The law of conservation of matter | states that matter can neither be created nor destroyed, but can be changed in form. |
Balanced chemical equation | has the same number of each kind of atom on the reactant side as on the product side. |
Coefficient | the number that comes before the chemical formula and indicates the number of molecules that participate in the reaction. |