447 Answered Questions for the topic chem
A vessel contains 10.4 g of oxygen gas and 16.3 g of carbon dioxide. If the partial pressure of carbon dioxide gas is 1.84 atm, what is the partial pressure of oxygen gas (in atm)?
Put the following in order of increasing intermolecular force:
H2O, Li2O, CO2
At 150 degrees Celsius, four of these substances are gases, and one is a liquid. Which one is the liquid?
A) CH4B) HOCH2CH2OHC) CH3OHD) CH3CH3E) CH3OCH3
Morality and Mass percent of Vinegar
A 10.00 -mL sample of vinegar, an aqueous solution of acetic acid (HC2H3O2), is titrated with .5073M NaOH, and 17.64 mL is required to reach the equivalence point.What is the molarity of the acetic... more
Identify the following reaction, label the acid, conjugate acid, base , and conjugate base: H2SO4 + H2O = HSO4 + H3O+
What is the molarity of a solution that contain 3.25 moles of NaCl in 250 mL of water? A.) 76.9m B.) 13.0 m C.) 0.813m D.) 0.013 m
Which substance will most affect the freezing point of water if 1 mole of the substance is added to 1 kilogram of water? A.) LiF B.) Ca(NO3)2 C.) Mg3N2 D.) C6H12O6
For the reaction CH4(g) + 2O2(g)CO2(g) + 2H2O(g) H° = -802.3 kJ and S° = -5.2 J/K
For the reactionCH4(g) + 2O2(g)CO2(g) + 2H2O(g)H° = -802.3 kJ and S° = -5.2 J/KThe maximum amount of work that could be done when 2.25 moles of CH4(g)react at 322 K, 1 atm is _____ kJ.Assume... more
Formula for this please
If 16.8 L of carbon dioxide gas is produced at STP in the following reaction, how many grams of methane (CH4) were burned?
Why is a calcium atom larger than a magnesium atom?
Please help explain in terms of not just periodic trends.
The major function of fermentation in our muscle cells is
A. to reduce NAD+ to NADHb. to generate lactic acid, which is later converted into fatty acid, which is a form of stored chemical energyc. not really known, and in fact it is believed fermentation... more
What process below would speed up a reaction by lowering the activation energy?
A. Adding heatB. Adding a catalystC. Increasing the amounts of reactantsD. Increasing the entropyE. All of the above would speed up a reaction by lowering the activation energy
How many calories are required to change 17.5 g H2O from 27 degrees celcius to ice at 0 degrees celsius?
Chemistry heat exothermic question. Calories/ water.
If 1000. g of calcium carbonate reacts with 750. g of hydrochloric acid, what is the theoretical yield of calcium chloride according to this reaction?
____CaCO3 + _____HCl ---> _____CaCl2 + _____H2O + _____CO2
Chorine and fluorine react to form gaseous chlorine trifluoride. In an experiment, you started with 1.75 moles of chlorine and 8.68 moles of fluorine.
___Cl2 + ____F2 ---> ___ClF2a. What is the limiting reactant?b. What mass of chlorine triflouride can be made?c. Which reactant is in excess?d. What mass of the excess reactant remains unused?
Copper (II) oxide solid and hydrogen gas react to form elemental copper and water.
a. Write a balanced equation for the reaction.b. How many grams of Cu can be produced when 19.9g of CuO react with 2.02g of H2?
Is nitrogren (N) or sulfur (S) more nonmetallic?
Is nitrogen (N) or sulfur (S) more nonmetallic? Please explain reasoning.
Which element is more nonmetallic between chlorine (Cl) and nitrogen (N) ?
Which element is more nonmetallic between chlorine (Cl) and nitrogen (N)? I know nonmetallic characteristics consist of a high ionization energy, high effective nuclear charge, small size, and high... more
Which element is more metallic between Sn or As and why?
Which element is more metallic between Sn or As and why? I know metallic characteristics consist of low effective nuclear charge, low ionization energy, low electron affinity, and large size,... more
Elements A ([core]ns2) and B ([core]ns2np5) react to form ionic compound AxBy. Select the false statement below:
Elements A ([core]ns2) and B ([core]ns2np5) react to form ionic compound AxBy. Select the false statement below: 1) x + y = 32) the first ionization energy of B is probably lower than the first... more
In two separate experiments, researchers used laser beams to confine 400 atoms (each) of Na and K in a volume 1.0 x 10-15 m3 (for a fraction of a second) at a temperature of 0.00024K. How
In two separate experiments, researchers used laser beams to confine 400 atoms (each) of Na and K in a volume 1.0 x 10-15 m3 (for a fraction of a second) at a temperature of 0.00024K. How many... more
How can dissolved materials be moved from the outside to the inside of a cell when the inside concentration of the material is higher than the outside concentration?
a. Molecules can be moved into a cell against their concentration gradient if that transport is coupled with osmotic transport of water into the cell.b. Substances can be moved against a... more
What is the minimum volume of 0.20 M lead(II) nitrate solution required to react with all of the iodide ion in 16.6 grams of potassium iodide dissolved in a solution?
A) 1.0 LB) 0.75 LC) 0.10 LD) 0.50 LE) 0.25 LPlease explain and show work!!
0.10 mole of solid calcium hydroxide is added to 1.00 liter of a 0.50 M solution of hydrochloric acid. After the reaction is complete, the hydrogen ion concentration of the solution will be:
A) 0.40 MB) 0.10 MC) 0.20 MD) 0.050 ME) 0.30 MPlease explain and show work! I've been stuck on this problem for ages