Upgrade to remove ads
Only $35.99/year

questions for book

Terms in this set (31)

Why is sodium chloride soluble in water, but methane is not soluble in water?
Sodium chloride is an ionic compound and ionic compounds dissolve in polar solvents, but methane is a non-polar solute so it does not dissolve in a polar solvent.
Why does 1 mole of carbon dioxide have the same average kinetic energy as 1 mole of hydrogen gas at 298 K?
At the same temperature all samples of gas have the same kinetic energy, because average kinetic energy is determined by temperature.
Why does methane have a lower melting point than octane?
Octane is a larger molecule and thus it has greater London dispersion forces than methane which is a much smaller molecule.
Why does water have a higher boiling point than carbon dioxide?
Water has hydrogen bonding between its molecules, which is a strong intermolecular force and therefore it has a higher boiling point than carbon dioxide, which has London dispersion forces.
Why is Carbon-14 radioactive?
Carbon-14 is radioactive, because it has neutron proton ratio which is greater than 1:1, which makes the atom unstable and thus it undergoes beta decay.
Why is Br2 a liquid at STP, while I2 is a solid?
Molecules of I2 have stronger intermolecular
forces than molecules of Br2 because I2 has stronger London dispersion forces.
Why is a molecule of CH4 nonpolar?
CH4 is nonpolar because although there are polar bonds between hydrogen and carbon, the CH4 molecule is symmetrical, which makes the molecule nonpolar.
Why are electrons in a carbon dioxide molecule closer to the oxygen atoms in the molecule?
Oxygen has a greater electron negativity than carbon so it a covalent bond the Oxygen atoms attract the valence electrons more than the carbon atom.
Why is a salt bridge needed in a voltaic cell?
A salt bridge is needed to allow free flowing ions to travel between each half cell to maintain a balance of charge.
Why does water boil at lower temperatures at higher altitudes?
At higher altitudes there is less atmospheric pressure less vapor pressure is needed for the water to equal atmospheric pressure and thus water boils boils at lower temperatures at higher altitude?
Why does 1 mole of methane gas have a larger mass than 1 mole of helium gas?
Methane has a larger molar mass than helium gas and therefore 1 mole of methane will have a larger mass than 1 mole of helium.
Why does HCl have a lower pH than CH3COOH?
HCl has a lower pH than CH3COOH because HCl ionizes almost completely and thus it is a strong acid, while CH3COOH does not ionize completely and thus it is a weak acid.
Why are metals malleable?
Metals malleable because they have a mobile sea of electrons, and they have metallic bonds, which have the ability to roll over each other.
Why are halogens diatomic?
The halogens are extremely reactive and they only need one electron to form a complete octet and thus they covalently bond with each other to form a stable molecule.
Why is carbon dioxide expected to deviate more from ideal gas behavior than helium?
Carbon dioxide has a larger mass and a larger radius than helium and since it has a larger mass and volume it is more polarizable and thus it has greater intermolecular forces than helium and thus the molecules have greater attraction for one another, which deviates from ideal behavior.
I reduce the activation energy of a chemical reaction
I am not consumed or produced during the reaction
I do not change equilibrium concentrations in a reaction
I am a catalyst
I am an aqueous solution that consists of a weak acid and its conjugate base
I resist large changes in Ph
I am a buffer solution
What is produced when a hydrocarbon is burned?
carbon dioxide and water
What are the products formed if AgNO3 (aq) and NaCl (aq) are reacted together?
AgCl (s) + NaNO3 (aq)
At what conditions do ideal gases deviate from ideal behavior?
At high pressure and low pressure.
I have the highest frequency of all radiation
I have the shortest wavelength of all types of radiation
I have the most energy of all radiation
I am Gamma radiation
What is the currently accepted atomic model?
The quantum-mechanical model of the atom
What wavelengths is the visible light spectrum between?
390 and 700 nm
What is the most electronegative element?
Flourine
What is the molar mass of calcium sulfate?
136.14 g/mol
What is the electron configuration of copper in noble gas notation?
[Ar] 3d¹⁰4S¹
What is the electron configuration of boron?
1S² 2S² 2P¹
What is the electron configuration of silicon in noble gas notation?
[Ne] 3S² 3P²
What is the mass of 3 moles of pure water?
54 grams
What is the mass of 2 moles of carbon ?
24 grams
What is the volume of 2 moles of gas at STP?
44.8 L