447 Answered Questions for the topic chem

10/21/19

Put the following in order of increasing intermolecular force:

H2O, Li2O, CO2

10/20/19

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
Chem Chemistry

07/26/19

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
Chem Chemistry

06/16/19

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.

04/14/19

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

03/28/19

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.

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?
Chem Chemistry

03/17/19

Is nitrogren (N) or sulfur (S) more nonmetallic?

Is nitrogen (N) or sulfur (S) more nonmetallic? Please explain reasoning.
Chem Chemistry

03/17/19

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
Chem Chemistry

03/17/19

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
Chem Chemistry

03/12/19

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
Chem Chemistry

03/11/19

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

03/05/19

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!!
Chem Chemistry

03/05/19

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
Chem Chemistry

03/03/19

reaction vessel remaining?

For the following balanced chemical equation:     2 Mg (s)   +  O2 (g)   →  2 MgO (s)   3.6 moles of Mg are put into a reaction container with 1.4 moles of O2 gas. The reaction is run until all of... more

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