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17 Cards in this Set
- Front
- Back
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What is the definition for an element?
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An element is a substance that cannot be decomposed into simpler materials by chemical reactions. It is a substance which consists of only one type of atom.
(ex. hydrogen-H2, Oxygen O2) Note: consider numbers as subscripts in the example. |
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What is the definition of a compound?
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A substance formed by two or more different elements in which the elements are always combined in the same fixed proportion of mass. It is a substance which contains two or more ions that are chemically bonded.
(ex. water-h20, table salt NaCI). Note: consider numbers as subscripts in the example. |
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What is the definitions of a Mixture? What are some types of mixtures?
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Two or more compounds are added together in a way that their is no new chemical composition or reactions.
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What is the definition of a mechanical mixture? What are some examples?
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Mechanical mixtures contain two or more substances that may be in more than one state; the different parts are visible
(ex. marbles & sand, salt & sepper, silt & water). |
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What is the definition of a homogeneous mixture and what is another name for it?
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A homogeneous mixture are composed of two or more parts that appear uniform.
(ex. sport drink, tap water). |
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What is the definition of a heterogeneous mixture? What is an example of this using the compound H2O?
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A heterogeneous mixture consists of two or more regions called phases that differ in properties (ex. the oil floats on vinegar as a separated layer). This can also be true for a compound in different physical states
(ex. Ice floats on water). |
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What is a physical change?
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Any change that does not include rearrangement of atoms in a substance (chemical change).
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What is a summary of the Law of Definite Composition?
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A given compound always contains the elements in the same mass ratio.
ex. (A+B= AB) 1g + 3g= 4g 25g+ 75g= 100g always 25% of A and 75% of B |
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What are the statements in main points in Dalton's atomic Theory (1800) and what is no longer true in modern science?
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1. Matter is made of tiny particles known as atoms.
2. Atoms are neither created or destroyed during chemical change they are rearranged. 3. Atoms of one element are identical to atoms of other elements. 4.Atoms of different elements are different. 5. When atoms combine to form compounds they do so in small whole number ratios- atoms are indivisible. |
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What is a definition of atoms?
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Atoms are the smallest particle of an element which has the chemical identity of the chemical.
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What is the Law of Multiple Proportion?
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If two or more different compounds are composed of the same two elements. The masses of the second element combined with the given mass of the first can be expressed as ratios of small whole numbers.
(ex. carbon monoxide has 12g of Carbon and 16 grams of Oxygen. Carbon dioxide has 12 grams of Carbon and 32 grams of Oxygen. The ratio is 16/32= 1/2). (ex. #2 Sulfur dioxide has 32 grams of sulfur and 32 grams of oxygen. Sulfur trioxide has 32 grams of sulfur and 48 grams of oxygen). The ratio is 32/48= 2/3). |
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What are the seven diatomic elements?
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The diatomic elements are
1) hydrogen H2 2) oxygen O2 3) nitrogen N2 4) fluorine f2 5) bromine br2 6) iodine I2 7) Chlorine CI2 Note: consider numbers as subscripts in the answer. |
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What is the definition of Luster, Conductivity, ductility, and Malleability.
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Note: answers for this flashcard come from www.dictionary.com
Luster- the state or quality of shining by reflecting light; glitter, sparkle, sheen, or gloss: the luster of satin. Conductivity- Also called specific conductance. Electricity. a measure of the ability of a given substance to conduct electric current, equal to the reciprocal of the resistance of the substance. Ductility- capable of being hammered out thin, as certain metals; malleable. Malleability- capable of being extended or shaped by hammering or by pressure from rollers. |
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On the periodic table what separates metals from non-metals? What are some them?
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The non-metals and metals are separated from each other by metalloids.
The metalloids are as follows: Boron (B) Silicon (Si) Germanium (Ge) Arsenic (As) Antimony (Sb) Tellurium (Te) Polonium (Po) |
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What symbols are used in an equation when describing the physical property of a compound or element.
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These symbols are
(aq) aquious- in water (g) gas (s) solid (l) liquid |
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What is Matter?
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Matter is anything that has mass and occupies space.
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How are coefficients and subscripts used in equations?
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Coefficients multiply everything in front of it by its value.
(ex. 2h20) Note: the number two between the hydrogen and the oxygen is a subscript number. There are four hydrogen atoms and two oxygen atoms. The subscript value describe the number of atoms for the element left of itself. |
