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Questions and Answers
Ice, H2O(s), is classified as?
Ice, H2O(s), is classified as?
a molecular compound
Compared to a 15-gram sample of Cu(s) at 25°C, a 25-gram sample of Cu(s) at 25°C has?
Compared to a 15-gram sample of Cu(s) at 25°C, a 25-gram sample of Cu(s) at 25°C has?
The kinetic molecular theory states that all particles of an ideal gas are?
The kinetic molecular theory states that all particles of an ideal gas are?
in random, constant, straight-line motion
To find atomic mass of multiple naturally occurring elements, use the formula: (atomic mass)(Natural abundance) + (atomic mass)(Natural abundance) / ____
To find atomic mass of multiple naturally occurring elements, use the formula: (atomic mass)(Natural abundance) + (atomic mass)(Natural abundance) / ____
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Compare the potential energy of the liquid water molecules to the potential energy of the water vapor molecules.
Compare the potential energy of the liquid water molecules to the potential energy of the water vapor molecules.
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Show a numerical setup for calculating the volume of the bubble at the bottom of the lake.
Show a numerical setup for calculating the volume of the bubble at the bottom of the lake.
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How many significant figures are in 104.0?
How many significant figures are in 104.0?
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Is a water molecule nonpolar?
Is a water molecule nonpolar?
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Identify the laboratory process described in this passage: A NaOH(aq) solution and an acid-base indicator are used to determine the molarity of an HCl(aq) solution.
Identify the laboratory process described in this passage: A NaOH(aq) solution and an acid-base indicator are used to determine the molarity of an HCl(aq) solution.
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State the change in oxidation number of oxygen during the reaction represented in equation 3: 2H2(g) + O2(g) → 2H2O(g) + energy.
State the change in oxidation number of oxygen during the reaction represented in equation 3: 2H2(g) + O2(g) → 2H2O(g) + energy.
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Identify one metal from Table J that is more easily oxidized than Zn.
Identify one metal from Table J that is more easily oxidized than Zn.
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Write the name of the process that occurs as the dry ice disappears and no liquid is observed in the flask.
Write the name of the process that occurs as the dry ice disappears and no liquid is observed in the flask.
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Study Notes
Ice Classification
- Ice (H2O(s)) is classified as a molecular compound.
Copper Sample Comparison
- A 25-gram sample of copper (Cu(s)) at 25°C has the same density and the same chemical properties as a 15-gram sample at 25°C.
Kinetic Molecular Theory
- States that all particles of an ideal gas are in random, constant, straight-line motion.
- Particles collide and transfer energy.
- The distances between particles are large relative to their sizes.
Electrochemical Cell Anode Change
- At the anode of an electrochemical cell, there is a loss of electrons.
Atomic Mass Calculation
- Atomic mass can be calculated using the formula: (atomic mass)(natural abundance) + (atomic mass)(natural abundance) ÷ 100.
- Remember, 15% = 15 when dividing by 100, and 15% = 0.15 otherwise.
Potassium Nitrate Classification
- Potassium nitrate is classified as an electrolyte because it releases ions in an aqueous solution.
pH Change with Hydrogen Ion Concentration
- When hydrogen ion concentration is decreased by a factor of ten, the pH increases by 1.
Potential Energy in Water States
- Liquid water molecules have less potential energy than water vapor molecules.
Volume Calculation for Gas Bubble
- Volume calculation formula: V = (KPa)(mL)(K) of surface / (KPa)(K) of bottom.
Significant Figures
- The number 104.0 contains 4 significant figures.
Density Change with Temperature
- A 10.0-gram sample of nitrogen at STP will have increased density when cooled to 72 K at standard pressure.
Equal Molecule Count at STP
- At STP, 3.0 liters of H2(g) contains the same number of molecules as 3.0 liters of CH4(g).
Water Molecule Polarity
- A water molecule is not nonpolar; it is polar.
Fastest Reaction Rate Factors
- Fastest reaction rate with 5.0-gram Fe(s) occurs by increasing surface area and HCl concentration.
Ideal Gas Behavior
- A sample of hydrogen gas behaves most like an ideal gas under low pressure and high temperature.
Equilibrium in Reversible Reactions
- At equilibrium, the rate of the forward reaction equals the rate of the reverse reaction.
Natural System Changes
- Systems in nature tend to undergo changes toward higher entropy and lower energy.
Heat of Reaction Definition
- The heat of reaction is defined as the difference between the potential energy of the products and reactants.
Identification of Electrolytes
- CH3COOH is an example of a compound that acts as an electrolyte.
Hydronium Ion Concentration Change
- When pH changes from 1 to 2, the concentration of hydronium ions decreases by a factor of 10.
Radioisotope Uses
- One beneficial use of radioisotopes is in the detection of disease.
Liquid Element at STP
- Bromine is the only liquid element at standard temperature and pressure (STP).
Compounds with Ionic and Covalent Bonds
- NaCN contains both ionic and covalent bonds.
Atom Count Equality at STP
- At STP, a 1-liter sample of Ne(g) and a 1-liter sample of Kr(g) have the same number of atoms.
Gas Volume Change
- A gas sample's volume changes to 52.5 mL when temperature is 150 K and pressure is 160 kPa.
Final Temperature after Heat Absorption
- A 100-gram sample of H2O(l) absorbs 8360 joules of heat, reaching a final temperature of 42.0°C.
Titration Process Identification
- The laboratory process described is titration/volumetric analysis, using MaVa = MbVb.
Oxidation Number Change
- In the reaction 2H2(g) + O2(g) → 2H2O(g), the oxidation number of oxygen changes from 0 to -2.
Oxidation Properties of Metals
- Any metal above zinc on Table J is more easily oxidized than Zn.
Sublimation Process
- The process occurring as dry ice disappears is known as sublimation.
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Test your knowledge with these flashcards covering various chemistry questions from the years 2014 to 2018. Explore concepts from molecular compounds to the properties of metals. Perfect for quick revision and enhancing your chemistry comprehension.
