25,963 Answered Questions for the topic chemistry

Chemistry

07/02/23

Calculating a molecular formula from mass of composition
2.24 g of iron combines with 0.96 g of oxygen to form an oxide of iron.Determine the formula of this oxide of iron and use it to complete the balanced equation.(relative atomic masses: Fe = 56.0, O... more
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Chemistry

07/01/23

Concentration of solution at precipitation point.
A solution has a concentration of .0035 for BOTH Ag3 and Cu3. If PbO4 is continuously added, which ion will precipitate first? What is the concentration of the first ion left in the solution after... more
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Chemistry

06/30/23

chemistry Problem
Calculate the concentration of each ion in the solutions made by mixing the following pairs of solutions. Assume no precipitate forms yet, and assume all volumes are additive. (a) 100.0 mL each of... more
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Chemistry

06/30/23

Chemistry Problem
A solution is 0.10 M Ba(NO3)2 and also 0.10 M AgNO3. Solid KIO3 is added slowly. (a) Calculate the concentration of iodate ion needed to saturate the solution with Ba(IO3)2(s) and with AgIO3(s).... more
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Chemistry

06/29/23

acid and base equilibria
1) Calculate the pH of the resulting solution when 100.0 mL of 0.2 M HNO2 is titrated by 0.1 M NaOH aftera) 0 mL of NaOH has been added.b) 100 mL of NaOH have been added.c) 150 mL of NaOH have been... more
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Chemistry

06/28/23

Calculate ΔH for the following reaction, which describes the production of syn-gas from carbon: H2O(g)+C(s)→CO(g)+H2(g).
Calculate ΔH for the following reaction, which describes the production of syn-gas from carbon:H2O(g)+C(s)→CO(g)+H2(g). The following enthalpy changes are known: H2(g)+1/2O2(g)→H2O(g)... more
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Chemistry

06/27/23

I’m asking 40 g into gas occupies a volume of 20 L at a temperature of 25°C. What is the pressure in fort of this gas
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Chemistry

06/24/23

The reaction C4H8(g)⟶2C2H4(g) has an activation energy of 262 kJ/mol. At 600.0 K, the rate constant, 𝑘, is 6.1×10−8 s−1. What is the value of the rate constant at 830.0 K?
The reactionC4H8(g)⟶2C2H4(g)C4H8(g)⟶2C2H4(g)has an activation energy of 262 kJ/mol.262 kJ/mol. At 600.0 K,600.0 K, the rate constant, 𝑘,�, is 6.1×10−8 s−1. What is the value of the rate constant... more
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Chemistry

06/24/23

Chemistry gas calculations
Three gases (8.00 g of methane, CH4, 18.0 g of ethane, C2H6, and an unknown amount of propane, C3H8) were added to the same 10.0-L container. At 23.0 ∘C, the total pressure in the container is... more
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Chemistry

06/24/23

chemistry questions
A 12.1912.19 g sample of a compound contains 3.893.89 g of potassium, K,K, 3.533.53 g of chlorine, Cl,Cl, and oxygen, O.O. Calculate the empirical formula. Insert subscripts as needed.Empirical... more
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Chemistry

06/23/23

what is the natural abundance of gallium-71 70.925amu?
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Chemistry Organic Chemistry

06/23/23

Is it possible to get A* in O' level chemistry just in 3 months preparations ?
Many of my students achieved this goal actually even after their mock examination. They were standing hardly at 30% in their level of understanding but right after working with me even for two... more
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06/23/23

The melting point of the re-crystallized salicylic acid has given a range of two or three.......
The melting point of the re-crystallized salicylic acid has given a range of two or three degrees, with upper limit of the range slightly below the (real) literature value of the melting point of... more
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06/23/23

If the material that you are re-crystallizing fails to precipitate out of the cold solvent, propose what would you do to recover the material from the solution?

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06/23/23

Draw the structural formula, IUPAC name and physical properties (color, mp, solubilities) of salicylic acid.

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Chemistry

06/23/23

How do you figure out the empirical formula between these two ions
How do I put Sn^4+ and ClO2- into an empirical formula.
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Chemistry

06/23/23

Determine the electron pair shape and molecular structure

Determine the electron pair shape and molecular structure of the following molecules. Also, indicate if the molecule is polar or nonpolar. A. PF3B. SeBr4C. H2SD. AsH3E. SiH4
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Chemistry

06/22/23

What is the complete balanced equation for copper metal plus silver nitrate produces silver metal and copper(II) nitrate?
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Chemistry

06/22/23

Why you can't you write the formula of the ionic compound that forms between Fe and S?

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Chemistry

06/22/23

Consider a metal bar with dimensions of l = 3.54 cm, w = 5.4 cm, and h = 10.1 cm. Calculate the volume of the bar (cm^3)
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Chemistry

06/22/23

Calculate the mass of(NH2)2CO that could theoretically be formed by this reaction.
Sorry, I could not add a comment,... more
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Chemistry

06/22/23

Identify 5 functions of proteins. Which would you argue is one of the more important functions? Why?
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Chemistry

06/22/23

Calculate the mass of(NH2)2CO that could theoretically be formed by this reaction.
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Chemistry

06/21/23

How do you figure out this question?
Gaseous butane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . suppose 2.32 g of butane is mixed with 14. g of oxygen. calculate the minimum mass of butane that... more
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06/21/23

Primary alcohols and secondary alcohols can be oxidized with chromic acid, but tertiary alcohols cannot. (i) How do the structural differences between the alcohols account for the observed reactions?
Primary alcohols and secondary alcohols can be oxidized with chromic acid, but tertiary alcohols cannot. (i) How do the structural differences between the alcohols account for the observed reactions?
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