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61 Cards in this Set
- Front
- Back
There are exactly 2.54 centimeters in 1 inch. When using this conversion factor, how many significant figures are you limited to? |
infinite number of significant figures |
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Trailing zeros at the end of a number, but before an implied decimal point, are ambiguous. |
true |
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When the number 65.59 is rounded to contain 2 significant figures, it becomes 66.0 |
false |
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If you know the density of a liquid and its volume, the mass of the liquid may be calculated using the equation: m = V/d. |
faslse |
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Suppose a boat engine leaks 938 milliliters of oil into a lake. The mass of this spilled oil is The oil will not mix with the lake water. Which statement is true? |
The oil will float because its density of 0.877 g/mL is less than the density of water. |
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A lead ball has a mass of 55.0 grams and a density of 11.4 g/cm3. What is the volume of the ball? |
4.82 mL |
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Given the following list of densities, which materials would float in a molten vat of lead provided that they do not themselves melt? Densities (g/mL): lead = 11.4, glass = 2.6, gold = 19.3, charcoal = 0.57, platinum = 21.4. |
glass and charcoal |
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Gases are the only form of matter that is compressible. |
True |
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Which state of matter has atomic spacing that is close together and indefinite shape? |
liquid |
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Liquids have definite volume and indefinite shape. |
true. |
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Solids have indefinite shape and volume. |
false |
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Which state of matter has atomic spacing that is close together and definite shape? |
solid |
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In a solid substance, the atoms or molecules oscillate and vibrate about a fixed point. |
true |
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Both solids and liquids are incompressible while gases are compressible. A gas has neither definite volume nor definite shape. A liquid has a definite volume; but it has no definite shape. A solid has a definite shape and a definite volume.
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all statements are true |
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Which state of matter has atomic spacing that is far apart and definite shape? |
no of them |
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Water is a mixture. |
false |
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Which of the following items is a pure substance? |
ice, tin, sulfur, diamond, water, pure sugar (sucrose), table salt (sodium chloride) and baking soda (sodium bicarbonate). |
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Matter |
Anything that takes up space, has mass, and is made up of particles. |
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Pure Substance |
A material that is composed of only one type of particle; examples of a pure substance include gold, oxygen and water. |
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mixture |
A material made up of at least two different pure substances. |
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Homogeneous |
A material having only one set of properties. |
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Heterogeneous |
A mixture, made up of parts that retain their own properties, even if these properties are not visible to the unaided eye. |
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Skim milk is a heterogeneous mixture. |
false |
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examples of homogeneous mixture? |
stainless steel |
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A pure substance may either be an element or a compound. A mixture may be either homogeneous or heterogeneous. Mixtures may be composed of two or more elements, two or more compounds, or a combination of both. Matter may be a pure substance or it may be a mixture. |
all these statements are tru |
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How would you classify salt water? |
mixture-homogeneous |
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Chemical properties of a substance are those that can be observed without changing the composition of a substance. |
false |
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Flammability of gasoline is a chemical property. |
true |
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Physical properties are: |
those that a substance displays without changing its composition. |
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In a chemical reaction, the substances present after the chemical change are called reactants. |
false |
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The melting of ice is a physical change. |
true |
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The corrosion of iron is a physical change |
false |
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Phase changes are always physical changes. In a chemical change, matter changes its composition. Chemical reactions are chemical changes. In a physical change, matter does not change its composition. |
all these statements are true. |
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A chemical change occurs when matter does not change its composition |
false |
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Which type of energy is associated with motion? |
kinetic |
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What type of energy is associated with the burning of gasoline? |
chemical |
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common unit of energy? |
joule kilowatt-hour calorie |
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A kelvin degree is the same size as a Celsius degree. |
true |
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Absolute zero is equivalent to a temperature of -273 K. |
false |
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The boiling point of water is |
212 F 373 Kelvin 100 Celcius |
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Which statement below accurately describes the contributions of Dalton? |
proposed the modern Atomic Theory |
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Which statement below accurately describes the contributions of Thomson? |
discovered the existence of electrons |
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Because atoms are neutral, the existence of a negatively charged particle implied there must be a positively charged component of an atom. Thomson proposed that electrons were small particles held within a positively charged sphere. The negatively charged electron is located outside the nucleus. |
discovery of electrons |
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The plum pudding model proposed that negatively charged electrons were held in a sphere of positive charge. |
true |
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All atoms of a given element have the same mass and other properties that distinguish them from the atoms of other elements. Atoms combine in simple, whole-number ratios to form compounds. Each element is composed of tiny indestructible particles called atoms. |
Dalton's Atomic Theory |
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Which statement reflects the results of Rutherford's gold foil experiments? |
Almost all of the alpha particles passed directly through the foil. |
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J.J. Thomson discovered |
discovery of the first subatomic particle. |
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Ernest Rutheford prove that |
inside an atom there is a nucleus |
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The gold foil experiment proved that large regions of the atoms consisted of empty space. |
true |
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An atom containing 7 protons, 8 neutrons, and 7 electrons |
is charge-neutral. |
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Mendeleev is best remembered for his pioneering work on determining atomic structure. |
false |
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Mendeleev's early periodic table predicted the existence of elements that had yet to be discovered. |
true |
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Group 1A elements are also called: |
alkali metals. |
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In the modern periodic table, elements are listed in order of increasing atomic number rather than increasing relative mass. |
true |
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Metals are located on the left side of the periodic table |
true |
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Group 8A elements are also called: |
noble gas |
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A cation forms when an atom gains an electron. |
false |
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When an atom loses an electron, the resulting particle is called |
a cation. |
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Cations are positive ions and anions are negative ions. Cations are formed when an atom loses electrons. Anions are formed when an atom gains electrons. |
all true statements |
|
cations |
Cations are ions with a net positive charge. |
|
anions |
Anions are ions with a net negative charge |