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Nadia

Questions (315)

Critically discuss how you would teach place value in the foundation phase. Demonstrate with examples on how to teach hundreds,
1. 1 answer
2. 32 views
Why Is a gas at 1.3 atm pressure and 20 L volume, at -10 degrees Celsius and 1 mole the gas not ideal?
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2. 49 views
Is a gas at 0.69 atm pressure and 25 L volume, at -10 degrees Celsius and 1 mole the gas, an ideal gas, why or why not (Ideal
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2. 90 views
Is a gas at 1.3 atm pressure and 20 L volume, at -10 degrees Celsius and 1 mole the gas, an ideal gas, why or why not (Ideal gas
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2. 93 views
Is a gas at 1.3 atm pressure and 20 L volume, at -10 degrees Celsius and 1 mole the gas, an ideal gas, why or why not
1. 1 answer
2. 61 views
UserIs a gas at 1.4 atm pressure and 15 L volume, at -10 degrees Celsius and 1 mole the gas, an ideal gas, why or why not (Ideal
1. 1 answer
2. 103 views
UserIs a gas at 1.4 atm pressure and 15 L volume, at -10 degrees Celsius and 1 mole the gas, an ideal gas, why or why not
1. 1 answer
2. 68 views
Is a gas at 1.4 atm pressure and 15 L volume, at -10 degrees Celsius and 1 mole the gas, an ideal gas, why or why not
1. 1 answer
2. 60 views
Is the reaction N2 (g) —> 2N (g) endothermic or exothermic and why
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2. 53 views
The enthalpy of vaporization of substance e is smaller than that of substance f. Which has the higher boiling point?
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2. 73 views
You are camping out and wish to bake an apple crisp using your Butane cooker. The crisp needs 1.5x10^3 kJ of heat per kg to
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2. 69 views
Is H2O or CH3(CH2)4CH3 a better solvent for an NaCl solute?
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2. 74 views
Is CCl4 or H2O a better solvent for a CH3(CH2)4CH3 solute?
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2. 82 views
At 100 degrees Celsius. Heat of vaporization is 40.66 kj/mol for water. Calculate the quantity of heat that is absorbed/released
1. 1 answer
2. 91 views
What is the temperature, at thermal equilibrium, when a 2.55 g sample of cream, originally at 3.89 degrees Celsius, is added to
1. 1 answer
2. 55 views
The normal boiling point of ethanol is 78.4 degrees Celsius. At what temperature would ethanol boil at a pressure of 0.621 atm?
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2. 99 views
Liquid x is known to have a lower surface tension than liquid y. Small amounts of liquid x and liquid y are sprayed into the
1. 1 answer
2. 84 views
Liquid x is known to have a lower surface tension than liquid y. Small amounts of liquid x and liquid y are sprayed into the
1. 1 answer
2. 86 views
A mixture of nitrogen and argon gas is compressed from a volume of 70.0 L to a volume of 61.0 L, while the pressure is held
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2. 58 views
A mixture of nitrogen and argon gas is compressed from a volume of 70.0 L to a volume of 61.0 L, while the pressure is held
1. 1 answer
2. 64 views
The enthalpy of vaporization of substance X is 5.00 kJ per mole and its normal boiling point is -57°C. Calculate the vapor
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2. 65 views
35.0 mL of liquid an are poured into a beaker. 35.0 mL of liquid h are poured into another beaker. After 90 minutes have passed,
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2. 64 views
35.0 mL of liquid an are poured into a beaker. 35.0 mL of liquid h are poured into another beaker. After 90 minutes have passed,
1. 1 answer
2. 63 views
Calculate the amount of heat needed to melt 69.7 g of solid hexane (C6H14) and bring it to a temperature of 47.2 degrees
1. 1 answer
2. 64 views
A sample of an unknown compound is vaporize at 180°C. The gas produce has a volume of 1020 mL at a pressure of one atmosphere,
1. 1 answer
2. 87 views
Using the balanced chemical equation for the combustion of liquid dodecane into gaseous carbon dioxide and gaseous water, answer
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2. 74 views
Calculate to three significant digits the density of dinitrogen monoxide gas at exactly -15°C and exactly one atmosphere. You
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2. 79 views
A 9 L tank at 20.6°C is filled with 5.25 g of chlorine pentafluoride gas, and 8.81 g of carbon dioxide gas. you can assume both
1. 1 answer
2. 90 views
A gas storage container in an ordinary chemical laboratory measures 4.9 cm wide and 20 cm high. The label reads: N2 gas with
1. 1 answer
2. 71 views
A cylinder measuring 7.7 cm wide and 9.3 cm high is filled with gas. The piston is pushed down with a steady force measured to
1. 1 answer
2. 91 views
An arctic weather balloon is filled with 33.3 L of helium gas inside a prep shed. The temperature inside the shed is 9 degrees
1. 1 answer
2. 81 views
A cylinder measuring 7.7 cm wide and 9.3 cl high is filled with gas. The piston is pushed down with a steady force measured to
1. 1 answer
2. 89 views
Which gas effuses faster, Ne or Ar, and how much faster?
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2. 36 views
Which gas excuses faster, Ne or Ar, and how much faster?
1. 1 answer
2. 45 views
Methane (CH4) diffuses 1.458 times as fast as a certain closely related gaseous compound. Which of the following could be the
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2. 77 views
Determine the relative root mean square speeds of O2 and SF6 at a given temperature
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2. 38 views
What would cause a high percent error when determining the molar mass of a metal using gas law determination
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2. 44 views
% error formula
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2. 38 views
What is the relative percent error of the experiment if your molar mass of magnesium metal is 88.21 g/mol
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2. 46 views
Based on your starting amount of metal (0.052g) , the net ionic equation of the reaction (Mg(s) + 2H+ (aq) —> Mg2+(aq) + H2
1. 1 answer
2. 76 views
Based on your starting amount of metal (0.052g) , the net ionic equation of the reaction (Mg(s) + 2H+ (aq) —> Mg2+(aq) + H2
1. 1 answer
2. 87 views
Based on your starting amount of metal (0.052g), the net ionic equation for the reaction (Mg(s) + 2H+ (aq) —> Mg2+ (aq) + H2
1. 1 answer
2. 85 views
What is magnesium’s molar mass
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2. 46 views
How can the molar mass of the metal be determined using the mole ratio between the metal acted and the hydrogen gas generated
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2. 74 views
Net ionic equation of magnesium forming H2 gas
1. 1 answer
2. 48 views
How many moles of H2 (g) are there if Ph2 is 0.565 atm, volume is 50.4 mL, and temperature is 20.9 degrees Celsius?
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2. 46 views
If the water level in the eudiometer is lower than the water level in the beaker at the end of the reaction, how would this
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2. 50 views
If you notice that the magnesium metal used appeared to be oxidized, the metal surface was black and full rather than silver and
1. 1 answer
2. 103 views
If you hadn’t added quite enough hydrochloric acid to consume all of your metal sample, what would the effect of this error be
1. 1 answer
2. 95 views
If an undetected bubble of air were trapped inside the gas collection tube at the start of the reaction, what would be its
1. 1 answer
2. 109 views
A fence is to be built to enclose a rectangular area of 800 square feet. The fence along three sides is to be made of material
1. 1 answer
2. 101 views
A 26 foot ladder is placed against a wall. If the top of the ladder is sliding down the wall at 2 feet per second, at what rate
1. 1 answer
2. 69 views
A 10 foot ladder is placed against a vertical all. Suppose the bottom of the ladder slides away from the wall at a constant rate
1. 1 answer
2. 92 views
A 10 foot ladder is placed against a vertical wall. Suppose the bottom of the ladder slides away from the wall at a constant
1. 1 answer
2. 87 views
A 25 foot ladder is placed against a vertical wall. Suppose the bottom of the ladder slides away from the wall at a constant
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2. 92 views
When is -8/(x+6)^2 equal to zero or undefined
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2. 44 views
Find the intervals on which f(x) is increasing, decreasing and local extrema for f(x)=x^3-3x+7
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2. 81 views
Find the intervals on which f(x) is increasing, decreasing and local extrema for f(x)=x^3+5x+7
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2. 78 views
Should the introduction section of a lab report begin with a broad statement of general principles, and then slowly focus in on
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2. 73 views
Should the discussion section of a lab report begin with a broad statement of general principles, and then slowly focus in on
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2. 86 views
Possible source of error that would cause a lower percentage of acid in a titration experiment and how to minimize this error
1. 1 answer
2. 93 views
Volume of NaOH titrated if the initial buret reading was 19.2 mL and the final buret reading was 35.48 mL
1. 1 answer
2. 95 views
Molarity of dilute NaOH made if the stock NaOH molarity was 6.0 M at 5 mL and the final volume of diluted NaOH was 250 mL
1. 1 answer
2. 89 views
Phenolphthalein changes from clear to pink near a pH of 8, but acids are exactly neutralized at a pH of 7. Does this discrepancy
1. 1 answer
2. 62 views
A student is titrating an acidic solution of unknown concentration with sodium hydroxide. They do not know what the acid is, and
1. 1 answer
2. 95 views
There was difficulty in determining the end point in the titration due to the color of the food sample and the titration was
1. 1 answer
2. 89 views
The pipet used for transferring the pickle juice to the flask was dirty and consequentially some of the pickle juice stuck to
1. 1 answer
2. 80 views
When diluting the pickle juice food sample for titration, is it important to know the final volume exactly? Why or why not?
1. 1 answer
2. 55 views
Molarity of CH3CO2H when there are 0.0019536 moles of CH3CO2H and the volume of NaOH tires red was 16.28 mL
1. 1 answer
2. 71 views
Information needed to determine Molarity of CH3CO2H
1. 1 answer
2. 51 views
Moles of NaOH titrated when 19.26 mL of a 0.12M solution of dilute NaOH
1. 1 answer
2. 67 views
Moles of NaOH titrated when 20.98 mL of a 0.12M solution of dilute NaOH
1. 1 answer
2. 74 views
What is the molarity of dilute NaOH made from an original molarity of concentrated NaOH of 6.0 M, a volume of concentrated NaOH
1. 1 answer
2. 119 views
Moles of NaOH titrated when 16.28 mL of a 0.12M solution of dilute NaOH
1. 1 answer
2. 62 views
Suppose 0.490g of lead(II) acetate is dissolved in 50 mL of a 57.0 m M aqueous solution of ammonium sulfate. Calculate the final
1. 1 answer
2. 114 views
Calculate the volume in liters of a 0.053M copper (II) sulfate solution that contains 4.00 mol of copper (II) sulfate (CuSO4).
1. 1 answer
2. 99 views
Is HSO4-(aq) + OH-(aq) —> SO42-(aq) + H20 (l) a redox reaction? What is the reducing agent and what is the oxidizing agent?
1. 1 answer
2. 86 views
Is 2Ca(s) + O2(g) —> 2CaO(s) a redox reaction? What is the reducing agent and what is the oxidizing agent?
1. 1 answer
2. 92 views
Is 2H2S(g) + O2(g)—> 2S(s) + 2H2O(l) a redox reaction? What is the reducing agent and what is the oxidizing agent?
1. 1 answer
2. 93 views
Oxidation state of Na in Na+
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2. 65 views
Oxidation state of Br in Br2
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2. 62 views
Oxidation state of O in OH-
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2. 47 views
Oxidation state of Cu in CuO
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2. 52 views
Calculate the volume in liters of a 0.0017 mmol/L calcium sulfate solution that contains 175g of calcium sulfate (CaSO4). Round
1. 1 answer
2. 99 views
A chemist prepares a solution of calcium bromide (CaBr2) by measuring out 0.54 kg of calcium bromide into a 350 mL volumetric
1. 1 answer
2. 101 views
An analytical chemist weighs out 0.291 g of an unknown diprotic acid into a 250 mL volumetric flask and dilutes to the mark with
1. 1 answer
2. 103 views
A chemist makes 460 mL of magnesium fluoride (MgF2) working solution by adding distilled water to 20.0 mL of a 18.8 umol/L stock
1. 1 answer
2. 130 views
A chemist makes 460 mL of magnesium fluoride (MgF2) working solution by adding distilled water to 20.0 mL of a 18.8 umol/L stock
1. 1 answer
2. 98 views
A chemist makes 460 mL of magnesium fluoride (MgF2) working solution by adding distilled water to 20.0 mL of a 18.8 umol/L stock
1. 1 answer
2. 95 views
Methods section for the SDS-Page portion of the lysozyme lab
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2. 76 views
What is in cell wall suspension
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2. 56 views
Discussion section for a lab report for the purifying enzymes lab using egg whites, testing of lysozyme activity at various
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2. 113 views
Introduction section for a lab report for the purifying enzymes lab using egg whites, testing of lysozyme activity at various
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2. 116 views
Introduction section for a lab report for the purifying enzymes lab using egg whites
1. 1 answer
2. 90 views
What is the shape of the hydrogen cyanide molecule
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2. 61 views
What is the shape of the nitrosyl hydride molecule
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2. 70 views
What is the shape of an HNO molecule
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2. 52 views
What is the angle between two of the carbon-hydrogen bonds in the methane (CH4) molecule
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2. 75 views
What is the angle between the carbon-chlorine bonds in the phosgene (COCL2) molecule
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2. 96 views
What is the angle between one of the carbon-hydrogen bonds and one of the carbon-chlorine bonds in the methylene chloride
1. 1 answer
2. 81 views

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