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46 Cards in this Set
- Front
- Back
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the region outside the nucleus where an electron can most probably be found is the... |
Electron cloud |
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How much energy is absorbed as head by 20. g of gold when it is heated from 25C to 35C? The specific heat of gold is 0.13J/g(C) |
26J |
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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? |
Octet Rule |
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As temperature increases, solubility of gases in liquids... |
Decreases. |
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If two covalently bonded atoms are identical, the bond is... |
non-polar covalent |
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The standard molar volume of a gas at STP (Standard Temperature Pressure) is... |
22.4 L |
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Mendeleec did not always list elements in his periodic table in order of increasing atomic mass because he grouped them together with similar... |
Properties |
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In the reaction N(base2) +3H(base2) -> 2NH(base3) what is the mole ratio of nitrogen to ammonia? |
1:2 |
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A volume of 1 cubic centimeter is equivalent to... |
1 Millimeter |
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If a gas occupies 950.0 mL at standard temperature, what volume does it occupy at 25.00 C if the pressure remains constant? What formula? |
1037 mL v1 over t1 equals v2 over t2 |
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These values were obtained as the mass of products from the same reaction: 8.83 g; 8.84 g ; 8.82 g . The known mass of products form that reaction is 8.60 g. These values are... |
Precise but not accurate |
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If [H3O+] of a solution is greater than [OH-], the solution is... |
always acidic. |
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Malleability and ductility are characteristic of substances with... |
metallic bonds. |
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For the reaction 2Na + 2H2O -> 2NaOH + H2, how many grams of sodium hydroxide are produced from 3.0 mol of water? |
120 g |
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with the quantum model of the atom, scientists have come to believe that determining an electron's exact location around the nucleus is... |
impossible |
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Millikan's experiment... |
measured the charge on the electron. |
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A pH scale in general use ranges from |
0-14 |
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A chemical bond from the electrostatic attraction between positive and negative ions is called a(n) |
ionic bond |
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The elements of the ____ group satisfy the octet rule without forming compounds. |
noble gas |
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In oxides of nitrogen, such as N2O, NO, NO2, N2O3, atoms combine in small whole number ratios. This evidence supports the law of.. |
multiple proportions |
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Atoms are ______ when they are combined. |
more stable |
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How many electrons are needed to completely fill the fourth energy level? What is the formula? |
32. The formula is 2n (squared) |
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What is the pressure exerted by 1.2 mol of gas with a temperature of 20c and a volume of 9.5 L? What is the formula? |
3atm PV=nRT R=0.0821 |
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The volume of a sample of oxygen is 300 mL when the pressure is 1 atm and the temperature is 27c. At what temperature is the volume 1L and the pressure 0.5 atm? What formula would you use? |
227c p1v1 over t1 = p2v2 over t2 |
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argon, krypton, and xenon are |
noble gases |
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a nuclear particle that has about the same mass as a proton, but with no electrical charge is called a(n) |
neutron |
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The periodic law allows some properties of an element to b e predicted based on its |
position in the periodic table |
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The algebraic sum of the oxidation numbers of the atom in a compound |
is always zero |
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Which expression represents the pH of a solution? |
-log[H3O+] |
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An Avogadro's constant amount of any element is equivalent to |
6.022 x 10 ^23 particles |
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An atom is electrically neutral because |
the numbers of protons and electrons are equal |
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Which of the following observations is quantitative? -The liquid turns blue litmus paper red. -The liquid boils at 100c. -The liquid tastes bitter. -The liquid is cloudy. |
The liquid boils at 100c. |
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In nature, alkali metals occur as... |
compounds |
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The most reactive group of the nonmetals are the |
halogens |
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The SI Standards units for length and mass are |
meter and kilogram |
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What is the formula for the compound formed be calcium ions and chloride ions? |
CaCl2 |
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What is the formula for aluminum Sulfate? |
Al(base2)(SO(base4))(base3) |
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Name the compound N2O3 |
di-nitrogen tri-oxide |
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What is the formula for di-phosphorous pent-oxide |
P2O5 |
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The equation AX + BY -> AY + B is the general equation for |
a double replacement reaction |
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The equation A + BX -> AX + B is the general equation for a |
single replacement reaction |
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The reaction 2Mg(s)+O2(g) -> 2MgO(s) is a |
synthesis reaction |
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Sugar water is an example of which solute-solvent combination? |
Solid-liquid |
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Colloids |
scattered light |
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to conduct electricity, a solution must contain |
ions |
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a substance whose water solution does NOT conduct a current is |
nonelectrolyte |
