01/12/21

How many moles are there in 1.505 X 1024 molecules of water, H2O?
A) 2.5 molesB) 2.50 molesC) 9.03 molesD) 9.03 x 1047 moles
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01/12/21

How many molecules of water are in a collection of snowflakes with a mass of 0.005 grams?
A) 5.43 x 1022B) 3.01 x 1024C) 1.67x 1020D) 2.17 x 1021
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01/12/21

4.8g of calcium is added to 3.6 g of water. The following reaction occurs. Ca + 2H2O → Ca(OH)2 + H2
(i) Which reagent is in excess? Explain your choice.(ii) Calculate the mass of the reagent named in (i) which remained at the end of the experiment.
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01/12/21

In another experiment, 0.020mol of sodium carbonate were reacted with excess hydrochloric acid. Calculate the maximum volume (at r.t.p.) of carbon dioxide gas that could be made in this reaction.
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01/12/21

Dilute hydrochloric acid was titrated with sodium carbonate solution. ( I am struggling with this kind of questions T_T)
• 10.0cm3 of 0.100mol/dm3 hydrochloric acid were placed in a conical flask. • A few drops of methyl orange indicator were added to the dilute hydrochloric acid. • The mixture was titrated with... more
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01/12/21

What is the percent composition of calcium chlorate?
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01/12/21

Two hydrogen atoms and oxygen atom are going through a chemical reaction to form water what would they say to each other as the chemical reaction occurs

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01/12/21

Question about vapor pressure
A flask containing nothing other than air at 100.0 kPa is filled partway with water and then sealed and left to sit at 20C. The total pressure of a mixture of gases is equal to the sum of the... more
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01/12/21

I am stumped on this chemistry
Methylamine, CH3NH2, is a weak base that is the building block of many commercially used organic substances.1.Write the equation for the dissociation of methylamine in water. Label the conjugate... more
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01/12/21

I need help with these problems
A solution of hypochlorous acid, HOCl, which has a known Ka of 3.5 x 10-8 is placed in a flask.1.Write the hydrolysis reaction of hypochlorous acid.2.Write the acid dissociation expression for this... more
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01/11/21

Ideal gas law combined gas law
A 3.20 L container holds 0.200 mols of oxygen gas at 325 K. What is the pressure inside the container?
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01/11/21

density of pure water
The density of pure water is 1 g/ml. Four students measured and calculated the density of pure water samples. The results are as follows: student 1 got 0.85 g/ml, student 2 got 0.94 g/ml, student 3... more
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01/11/21

How many grams of C2H2 are needed to produce 15 moles of CO2?
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01/11/21

enzyme denaturing
Incubation of an enzyme at 38 degrees denatures the enzyme however if you add a substrate at the same temperature the enzyme is active. Why is this?Thanks
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01/11/21

Amines as bases in comparison to ammonia
Hi!I wonder; why are amines stronger bases than ammonia, and why tertiary amines are stronger bases than primary amines?I can't really find an answer in the internet that uses the Bronsted-Lowry... more
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01/11/21

Six unknown organic compounds
Hi!I need help with a chemistry question:Question: You have six organic compounds in different test tubes. They are: Stearic acid 1-Cyclohexene 1-propanol Sodium acetate Heptane Benzoic acid You do... more
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01/11/21

PH calculation-chem
For a 0.01 M solution of formic acid at pH 4, calculate the concentrations of the conjugate base and acid. The pKa of formic acid is 3.77. thank you
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01/11/21

How much grams of calcium hydroxide is needed to make 1500mL of solution of calcium hydroxide with a pH of 12.50?

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01/11/21

4. (a) A lab analysis of a 10.00 g sample of benzene indicates that it contains 9.20 g of carbon.

What is the mass of hydrogen in the sample? Explain. (b) What is the percentage composition of benzene?
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01/10/21

Helpp plzz i need answers

1. 1.29 x 10^24 atoms of HF to grams2. 3.14g of H2O to molecules3. 2.79g NH3 to atoms4. 4.90 mol Al2O3 to grams. To atoms5. 3.56g of Cu to atoms6. Mass of a sample of NO2 with 1.54 x 10^24 atoms.
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01/10/21

A 5.431 m formic acid (HCO2H) solution in water has a density of 1.047 g/mL. Find the molarity of the solution and the percent by mass and mole fraction of formic acid
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01/10/21

A solution is made by dissolving solute B in solvent A. Consider the A-A attractive forces, the B-B attractive forces, and the A-B attractive forces.
If the solution process is exothermic, what can you say about the relationships between these attractive forces?
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01/10/21

Put these four molecules in INCREASING order (from lowest to highest) of predicted melting and boiling point temperatures:
Methane (CH4), ethane (C2H6), propane (C3H8) and butane (C4H10) are all substances that are used as combustible fuels. Put these four molecules in INCREASING order (from lowest to highest) of... more
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01/10/21

Which compound has the lowest normal boiling point? Why?
Which compound has the lowest normal boiling point? Why?a) HCIb) H2Sc) NH3d) CH4Which of the following substances is the best conductor of electricity? Why?a) H2O (g)b) H2O (s)c) NaCI (s)d) NaCI (l)
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01/09/21

Question about lewis diagrams and its relationship to boiling point of atoms
a) Sketch Lewis diagrams for H2 and F2.b) Boiling point is related to the structure of a substance. What, if anything, about the structures of H2 and F2you drew could account for the differences in... more
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