Ask Chemistry Expert

Fundamentals of chemistry.

1. Hydrogen bonding in water contributes to
1. a decreased boiling point
2. an increased vapor pressure
3. a decreased melting point
3. a decrease in volume on freezing
4. none of the above.

2. The conditions under which gases behave most ideally are
1. high temperature, high pressure
2. low temperature, low pressure
3. high temperature, low pressure
4. low temperature, high pressure

3. Under the Bronsted?Lowry definition a base is
1. a source of hydroxide ions.
2. a proton donor
3. a proton acceptor
4. a nonelectrolyte

4. The gas in a cylinder at 20.0 oC exerts a pressure of 200 atm. The cylinder is heated to a temperature of 200 oC. To what value will the pressure rise assuming the cylinder volume does not change?
1.484 atm.
2. 223 atm.
3. 2000 atm.
4. 20 atm.
5. none of the above.

5. Which pressure does not correspond to 1.25 atm? ( 1 in. = 2.54 cm)?
1. 950 torr
2. 950 cm Hg
3. 37.4 in. Hg
4. all of the above.
5. none of the above

6. A solution is found to have a pH 3.20. What is its pOH?
1. 3.20
2. 8.80
3. 14.00
4. 10.80

7. The pH of many cola ? type drinks is about 3.0. How many times greater is the hydronium ion concentration in these drinks than in neutral water?
1. 10,000 times
2. 1,000
3. 7,000 times
4. 100,000 times
e. none of the above, pH of water and most colas are the same.

8. At constant temperature the volume of a gas is inversely proportional to its pressure. This is known as (the)
1. Boyle's law.
2. Dalton's law.
3. Charles` law.
4. ideal gas law.

9. Changing the temperature of 4.0 mol of hydrogen gas at constant pressure from 100 oC to 200 K will
1. increase its mass by a factor of three.
2. decrease the volume that the gas occupies.
3. increase the kinetic energy of the hydrogen molecules.
4. decrease the density by a factor of two.

10. In one experiment, a dry sample of an unknown gas was collected. Its volume at 745 mm Hg and 63.0 oC was 815.5 mL. How many moles of this gas was obtained?
1. 0.0290 moles
2. 2.90 moles
3. 29.0 moles
4. 2310 moles
5. none of the above.

11. A weak electrolyte generates
1. a high percentage of ionization in solution.
2. a low percentage of ionization in solution.
3. essentially zero ionization in solution.
4. low solubility in a basic solution.

12.The possible consequences of the greenhouse effect were seen in recent data suggesting a correlation with the onset of spring in North American and all of Europe Recent satellite date shows spring plants emerging a full seven days early on average in the 1986?1996 period as compare with data for the 1960?1980 period. Fossil fuel use contributes to the greenhouse effect by increasing the concentration of which of the following gases.
1. ozone
2. carbon monoxide
3. carbon dioxide
4. all of the above.
5. none of the above.

Chemistry, Academics

  • Category:- Chemistry
  • Reference No.:- M918845

Have any Question?


Related Questions in Chemistry

Question 1bonding energyi draw an energy level diagram for

Question 1: Bonding Energy i. Draw an energy level diagram for a single Na ion and Cl ion. ii. Explain what is happening to the energy level between these two ions in terms of the Potential Energy. iii. Which process uti ...

Wat is the molarity to the hundredths place of 50 g hpo3

What is the molarity, to the hundredths place, of 5.0 g HPO3 in 300. mL of solution?

Describe how to assign anbspoxidation number from

Describe how to assign a Oxidation number from the text: The oxidation number of an atom in an elemental substance is zero. The oxidation number of a monatomic ion is equal to the ion's charge. Oxidation numbers for comm ...

How many grams of h2so4 must be dissolved into 0709 l of

How many grams of H2SO4 must be dissolved into 0.709 L of solution to generate a concentration of 0.303 M?

What could a source of error be during a titration lab that

What could a source of error be during a titration lab that is not a humans fault?

How many moles of magnesium ion are present in 525g

How many moles of magnesium ion are present in 5.25g Mg 3 (PO 4 ) 2 ?

What is the volume of a solution with a concentration of 12

What is the volume of a solution with a concentration of 1.2 M that contains 12 g of NaOH?

What is the molarity of a solution made by dissolving 200 g

What is the molarity of a solution made by dissolving 20.0 g of CrCl2 in 0.150 L of solution?

What is the mass of naoh present in grams given that a 100

What is the mass of NaOH present in grams, given that a 100. mL solution has a concentration of 0.125 M?

What is the volume of a solution in milliliters that

What is the volume of a solution, in milliliters, that contains 1.5 g LiNO3 and has a concentration of 0.40 M?

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Why might a bank avoid the use of interest rate swaps even

Why might a bank avoid the use of interest rate swaps, even when the institution is exposed to significant interest rate

Describe the difference between zero coupon bonds and

Describe the difference between zero coupon bonds and coupon bonds. Under what conditions will a coupon bond sell at a p

Compute the present value of an annuity of 880 per year

Compute the present value of an annuity of $ 880 per year for 16 years, given a discount rate of 6 percent per annum. As

Compute the present value of an 1150 payment made in ten

Compute the present value of an $1,150 payment made in ten years when the discount rate is 12 percent. (Do not round int

Compute the present value of an annuity of 699 per year

Compute the present value of an annuity of $ 699 per year for 19 years, given a discount rate of 6 percent per annum. As