11/20/20

i need help on this

Consider a different chemical reaction, with different chemicals, than the one carried out in this experiment. If you ran this new chemical reaction and found that the temperature change was... more
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11/20/20

chemistry/thermodynamics/calorimetry
A 2.50 g sample of powdered zinc is added to 100.0 mL of a 2.00 M aqueous solution of hydrobromic acid in a calorimeter. The total heat capacity of the calorimeter and solution is 448 J/ºC . The... more
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11/20/20

thermochemistry problem (please help if u can!)
When 0.467 g of sodium metal is added to an excess of hydrochloric acid, 4950 J of heat are produced. What is the enthalpy of the reaction as written?2Na (s) + 2 HCL (aq) → 2NaCL (aq) + H2 (g)
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11/20/20

calorimetry / thermodynamics problem

Potassium nitrate, KNO3, has a molar mass of 101.1 g/mol. In a constant-pressure calorimeter,  26.5g of KNO3 is dissolved in 243 g of water at 23.00ºC.KNO3 (s) → K+ (aq) + NO3- (aq)The temperature... more
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11/20/20

Write the chemical formulas for the products formed in each of the following reactions
If it is an acid-base reaction, label the acid, the base, the conjugate acid and the conjugate base.HCO3- + H3PO4 ---->CH3NH2 +HCI ---->Zn + HBr ----->
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11/20/20

In the following equilibrium reactions, label the stronger acid (SA), the stronger base (SB), the weaker acid (WA), the weaker base (WB),
AND tell whether the equilibrium lies towards the right or the leftHCO3- + H20 ---> H3CO3 + OH-H2S + CH3COO- ---> HS- + CH3COOH
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11/20/20

A mixture of xenon and nitrogen gases, at a total pressure of 749 mm Hg, contains 16.8 grams of xenon and 5.54 grams of nitrogen. What is the partial pressure of each gas in the mixture?
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11/20/20

What are the molar concentrations of H3O+ and OH- in a solution that has a pH of 9.85?

What are the molar concentrations of H3O+ and OH- in a solution that has a pH of 9.85? Show your work. 
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11/20/20

What is the pH of a solution having a H3O+ concentration of 3.50 X 10-5 M?

Show your work (write the equation you use).
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11/20/20

What shape will a molecule have if there are 2 bonding electron pairs and 1 non-bonding electron pair around a central atom? What is the orbital hybridization on the central atom?
What shape will a molecule have if there are 2 bonding electron pairs and 1 non-bonding electron pair around a central atom?  What is the orbital hybridization on the central atom?
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11/20/20

A pure gold coin contains 0.134 mol of gold. What is its mass?
I need help fast for my mastering chemistry assignment. Lol my grade is dropping and I don't understand this.
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11/20/20

calorimetry / thermodynamics problem

1 a. Assume that it is possible to heat water with perfect insulation (all the heat from combustion of ethanol is transferred to water).How much energy (in joules) is needed to heat 200.0 g of... more
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11/20/20

What is the final concentration of chloride ions?
A chemist dilutes 20.0 mL of 0.902 M solution of calcium chloride into 680.0 mL of a 0.328 M solution of sodium chloride. What is the final concentration of chloride ions?
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11/20/20

Consider the reaction: 2 Al (s) + 3 H2SO4 (aq) ----Al2(SO4)3 (aq) + 3 H2 (g)
What mass (in micrograms) of aluminum would completely react with 26.5 mL of 0.542 M sulfuric acid?
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11/20/20

The charges and sizes of the ions in an ionic compound affect the strength of the electrostatic interaction between the ions and thus the strength of the lattice energy of the ionic compound.
Arrange the compounds according to the magnitudes of their lattice energies based on the relative ion charges and sizes.: KBrMgSMgCl2NaCl
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11/20/20

Calorimetry/Thermodynamics problem. Please help if you can!
If you have 0.266 m3 of water at 25°C in an insulated container and add 0.112 m3 of water at 95°C, what is the final temperature Tf of the mixture? Use 1000 kg/m3 as the density of water at... more
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11/20/20

What is the lewis dot structure of sodium hypochlorite?
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11/20/20

Chemistry Question

You have a glass of water with a volume of 250 mL and a temperature of 12 degrees Celsius. You add a piece of dry ice, CO2(s), which has a mass of 25 g, to cool down his water. If dry ice has an... more
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11/20/20

 Would changing the volume a solutions and the incremental dilution volumes affect the successive concentrations?
 Would changing the volume a solutions and the incremental dilution volumes affect the successive concentrations?
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11/19/20

How do i make a 200ml inoculation solution?
Stocks: 250mM MgCl2 and 1% SilwetSolution needs: 10mM MgCl2 and 0.02% Silwet
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11/19/20

steps to solve for new % (m/v) concentration and new molarity ?

a. What is the new % (m/v) concentration when water is added to 25.0 mL of 20.0% (m/v) NaOH to make 300.0 mL of a diluted NaOH solution?b. What is the new molarity of the solution when water is... more
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11/19/20

What element is designated by the orbital diagram below?
What element is designated by the orbital diagram below?2s ↓↑ 2p ↓↑ ↓↑ ↑1s ↓↑a) Nb) Oc) Fd) Nee) Cl
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11/19/20

In an ionic compound, the size of the ions affects the internuclear distance (the distance between the centers of adjacent ions), which affects lattice energy

Based on ion sizes, arrange these compounds by their expected lattice energy.Note that many sources define lattice energies as negative values. Please arrange by magnitude and ignore... more
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11/19/20

Sodium Hydroxide NaOH Solution

I am electroplating a bracelet and this solution calls for a post treatment of a 50*C warm dilute sodium hydroxide solution (50 g/l)How do I make this solution in a 500ml beaker?
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11/19/20

Calculate the total internal energy of the N2 nitrogen gas molecules moving at an average speed of 450 m/s. Assume ideal gas behavior.
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