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Questions (166)

HOw much energy is required to ionize a mole of Hydrogen atoms?
1. 1 answer
2. 1,691 views
Calculate the wavelength of light that must be absorbed by hydrogen atom in its ground state to reach the excited ste of
1. 1 answer
2. 2,696 views
What happened if you put the Elodea leaf cells in a solution of 0.5% NaCl,1.8% NaCl and 0.9%NaCl?
1. 0 answers
2. 784 views
In your own words, explain the second law of thermodynamics and explain why it is not violated by living organisms?
1. 1 answer
2. 523 views
Draw the condensed structural formulas of ethyl alcohol
1. 1 answer
2. 479 views
If 39.2 of 0.177 is required to neutralize completely 22.0 solution, what is the molarity of the acid?
1. 1 answer
2. 628 views
what is the meaning of the numeral represented by X in the general formula for hydrate salt * XH2O
1. 1 answer
2. 4,360 views
How many milliliters of 3.60 {\rm M} {\rm HCl} are required to react with 140 {\rm mL} of 1.60 {\rm M}{\rm Al}({\rm OH})_{3}?
1. 2 answers
2. 588 views
If Tums is added to 55.0 {\rm mL} of 0.750 {\rm M}{\rm HCl}, how many grams of {\rm CO}_{2} gas are produced?
1. 0 answers
2. 414 views
If you placed the stethoscope on the patient's bracial artery, but did not put the BP cuff on the patient, you wouldnt hear
1. 1 answer
2. 627 views
Calculate each of the following quantities in 0.183 mole {\rm (C_3H_5)_2O}: Find the Atoms of H and C
1. 0 answers
2. 484 views
A sample of propane, \rm C_3H_8, contains 12.8 moles of carbon atoms. How many total moles of atoms does the sample contain?
1. 1 answer
2. 749 views
Why is it important to clear a neurotransmitter quickly from the synaptic cleft? What might happen to the target muscle cell if
1. 0 answers
2. 685 views
The 16th term of an Arithmetric Progression is four times the 36th term, and exceeds it by 32. Finda the numbers.
1. 0 answers
2. 560 views
Parathyroid hormone and calcitonin are synthesized where?
1. 1 answer
2. 511 views
What condition triggers its release(e.g., glucose in blood)1.Thyroid hormone 2.ADH 3. Aldosterone 4. Epinephrine 5. Melatonin 6.
1. 1 answer
2. 471 views
Compare and contrast the activity of acetylcholine, dopamine, serotonin, and norepinephrine. If the statement applies to more
1. 0 answers
2. 550 views
There may be more than one region in which the neurotransmitter is active. Choose one, and make sure your answer in column 4
1. 0 answers
2. 613 views
Match the poison/drug to the effect.a. curare b. tetanus toxin c. a-bungarotoxin d. strychnine e. botulinum toxin f. neostigmine
1. 0 answers
2. 604 views
Fill in the table with information about the action of pharmaceutical drugs on neurological disorders.Name of drug 1.Valium
1. 0 answers
2. 509 views
For the reaction: C4H10 + O2 �¨ CO2 + H2O ( is this balanced?) , how many moles of CO2 is formed when 5.00 moles C4H10 reacts
1. 1 answer
2. 1,131 views
Classify each of the eight living things listed below into one of the two groups according to an important physical
1. 1 answer
2. 1,268 views
If a man’s ideal weight is 165 lbs. and he weighs 185 lbs., how many pounds above his ideal weight is he? What percent above
1. 1 answer
2. 1,412 views
Obesity is defined medically as 20% above a person’s ideal weight. If a person’s idealweight is 72 kg, when (above what
1. 1 answer
2. 686 views
A patient’s blood cell count shows 15,000 white blood cells (WBCs) per µL of blood. A normal WBC count is about 9,000
1. 1 answer
2. 634 views
how many molecules of CH4 gas are present in a 1.00 L flask of CH4 gas at STP?
1. 3 answers
2. 1,382 views
What volumes will each of the following occupy at STP?a. 1.80 x 10^24 molecules of SO3 b. 7.5 mol C2H6 c. 25.2 grams chlorine
1. 2 answers
2. 1,411 views
Which one in this pair has the larger radius? Explaina. Calcium atom or calcium ion b. Aluminum ion or Magnesium ion
1. 1 answer
2. 1,928 views
A sample of propane gas, C3H8, was collected over water at 25 degree Celsius and 745 torr. The volume of the wet gas is 1.25 L.
1. 3 answers
2. 1,762 views
A sample of propane gas, C3H8, was collected over water at 25 degree Celsius and 745 torr. The volume of the wet gas is 1.25 L.
1. 1 answer
2. 712 views
Which one in this pair has the larger radius? Explaina. Calcium atom or calcium ion b. Aluminum ion or Magnesium ion
1. 0 answers
2. 577 views
As one descends group 6A of the periodic table, the number of valence electronsfound in each element? A. Increases B. Decreases
1. 1 answer
2. 975 views
Which is not a ground state electron configuration?A. 1s2 B. 1s2 2p1 C. 1s2 2s2 D. 1s2 2s2 2p1
1. 0 answers
2. 467 views
A 21.18 mL of 0.250 M NaOH is titrated with a H2SO4 solution. The initialvolume of H2SO4 was 13.28 and the final volume of H2SO4
1. 1 answer
2. 1,214 views
You know the solution forms a precipitate when?(A) when it changes color (B) when you can’t see through it (C) because it
1. 2 answers
2. 403 views
Which is not a ground state electron configuration?A. 1s2 B. 1s2 2p1 C. 1s2 2s2 D. 1s2 2s2 2p1
1. 5 answers
2. 2,246 views
As one descends group 6A of the periodic table, the number of valence electronsfound in each element? A. Increases B. Decreases
1. 0 answers
2. 581 views
A 21.18 mL of 0.250 M NaOH is titrated with a H2SO4 solution. The initialvolume of H2SO4 was 13.28 and the final volume of H2SO4
1. 0 answers
2. 589 views
What is the mole of oxalic acid?Equation:H2C2O4 + 2NaOH---> Na2C2O4 + 2H2O *Moles of oxalic acid dihydrate is 0.032 mole. *
1. 0 answers
2. 1,316 views
What is the mole of oxalic acid?Equation:H2C2O4 + 2NaOH---> Na2C2O4 + 2H2O *Moles of oxalic acid dihydrate is 0.032 mole. *
1. 1 answer
2. 1,587 views
What mass of silver nitrate is dissolved in 40.0 mL of a 0.400 M solution of silver nitrate?
1. 1 answer
2. 2,938 views
What is the molarity of the resulting solution when 300. mL of a 0.400 M solution is dilutedto 800. mL?
1. 1 answer
2. 6,034 views
What is the concentration of a H2SO4 solution if 10.0 mL of the solution is neutralized by7.8 mL of a 0.20 M NaOH solution?
1. 1 answer
2. 4,335 views
What is the concentration of a HCl solution if 20.0 mL of the solution is neutralized by15.0 mL of a 0.10 M Ca(OH)2 solution?
1. 0 answers
2. 688 views
A 120. mL sample of a gas is at a pressure of 1.50 atm. If the temperature remains constant,what will be its volume at 3.50 atm
1. 1 answer
2. 1,152 views
As one descends group 6A of the periodic table, the number of valence electronsfound in each element? A. Increases B. Decreases
1. 0 answers
2. 851 views
Which is not a ground state electron configuration?A. 1s2 B. 1s2 2p1 C. 1s2 2s2 D. 1s2 2s2 2p1
1. 1 answer
2. 470 views
A 21.18 mL of 0.250 M NaOH is titrated with a H2SO4 solution. The initialvolume of H2SO4 was 13.28 and the final volume of H2SO4
1. 2 answers
2. 1,148 views
Why was there condensation of the beaker of cold water when a blue flamewas passes underneath? This experiment is from the Gas
1. 1 answer
2. 1,369 views
Determine if the reaction produces a precipitate. For aprecipitate mark ‘a’ and if there is no precipitate mark ‘b’. 8.
1. 1 answer
2. 646 views
A 19.18 mL of 0.125 M Oxalic Acid (H2C2O42H2O) is titrated with a Ca (OH)2solution. The initial volume of Ca(OH)2 was 14.38
1. 2 answers
2. 577 views
After subtracting the weight of the container, the Vanadium metal inside isfound to weigh 8.34 grams. After reacting with Oxygen
1. 1 answer
2. 551 views
Your length measurement was 21.34 cm. The ‘accepted value’ was 21.77cm. What is the percent error of your measurement?
1. 1 answer
2. 572 views
An unknown metal, heated to an unknown temperature until a liquid is droppedinto a calorimeter that has 250 ml of water. The
1. 1 answer
2. 830 views
An unknown metal has a volume of 5.25 mL and a density 2.71 g/mL. What isthe weight of the metal in grams?
1. 1 answer
2. 555 views
1. If 25 grams of Iron (III) hydroxide is dissolved in a 500mL volumetric flask, what is the Molarity of the solution?2. An
1. 1 answer
2. 1,380 views
balance molecular formula, total ionic formula and net ionic formula of Sr(NO3)2 + Al2(SO4)3. Thank you
1. 1 answer
2. 1,690 views
balance molecular formula, total ionic formula and net ionic formula of Sr(NO3)2 + Al2(SO4)3. Thank you
1. 1 answer
2. 545 views
Consider the following equation:4NH3(g) + 5O2(g)----> 4NO(g)+6H2O(g) a. How many liters of oxygen are required to react with 2.5
1. 1 answer
2. 4,390 views
1. What is the Kelvin temperature of a system in which 4.50 mol of a gas occupy 0.250 L at 4.15 atm?2. In the lab, students
1. 1 answer
2. 1,391 views
1. What volume will a mixture of 5.00 mol of H2 and 0.500 mol of CO2 occupy at STP?
1. 2 answers
2. 819 views
Other than a specific confirmatory test, give a simple test that would allow you to distinguish between the following pairs of
1. 1 answer
2. 657 views
which illustrates in an increase in potential energy?a. a firecracker explodes b. a person climbs a set of stairs c. a wind-up
1. 1 answer
2. 1,059 views
1. Lead (Pb), has a density of 11.35 g/ml. If I have 3.45 cc of lead, what is the weight ingrams? 4. I am traveling at 100 mph
1. 1 answer
2. 972 views
A cobble-sized sediment is naturally broken off the steep sides of a valley in a mountainous region. The sediment falls onto a
1. 2 answers
2. 2,815 views
Write the equation of the tangent at (2,2) to the curve x^2-2xy+y^2+2x+y-6=0Can anyone please give me some ideas to do
1. 3 answers
2. 582 views

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