25,963 Answered Questions for the topic chemistry

Chemistry

10/01/23

How many milliliters of 2 M NaCl solution are required to make 1 L of 0.4 M NaCl solution?

How many milliliters of 2 M NaCl solution are required to make 1 L of 0.4 M NaCl solution?
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Chemistry

09/30/23

Convert a CaCL2 standard with a concentration of 8.40 mg/dL to mEq / L.
You added 400 mg of NaHCO3 to 500 mL of diluent, what is the molarity of this solution? Convert a CaCL2 standard with a concentration of 8.40 mg/dL to mEq / L.
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Chemistry

09/30/23

An assay requires a 70 % (v/v) solution of EtOH but your lab only has a 99.3 % (v/v) stock solution of EtOH. How much of the stock solution will you need to make 3.0 L of the assay EtOH solution?
An assay requires a 70 % (v/v) solution of EtOH but your lab only has a 99.3 % (v/v) stock solution of EtOH. How much of the stock solution will you need to make 3.0 L of the assay EtOH solution?
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Chemistry

09/30/23

You are working with a stock NaCl solution that contains 6.00 g of NaCL for every liter of solution. If you want to make 650.0 mL of solution, how much NaCl will you need?
You are working with a stock NaCl solution that contains 6.00 g of NaCL for every liter of solution. If you want to make 650.0 mL of solution, how much NaCl will you need?
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Chemistry

09/29/23

Sodium Thiosulfate Attacking Metal Surface
Can anyone help why sodium thiosulfate with typical Ph of 8, being hydrophilic, creates severe corrosion on metal surfaces like steel. Does water activate the sulfur content in it? Is there... more
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Chemistry

09/29/23

What is the chemical formula for the limiting reactant in the reaction shown? Write the balanced chemical equation for the reaction, using lowest whole-number coefficients.
What is the chemical formula for the limiting reactant in the reaction shown?chemical formula: ?Write the balanced chemical equation for the reaction, using lowest whole-number... more
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Chemistry

09/29/23

What is the maximum mass of S8 that can be produced by combining 83.0 g of each reactant?
What is the maximum mass of S8 that can be produced by combining 83.0 g of each reactant?8SO2+16H2S⟶3S8+16H2O mass of S8: ? g
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Chemistry

09/29/23

A sample of 6.50 g of liquid 1‑propanol, C3H8O, is combusted with 37.1 g of oxygen gas. Carbon dioxide and water are the products.
A sample of 6.50 g of liquid 1‑propanol, C3H8O, is combusted with 37.1 g of oxygen gas. Carbon dioxide and water are the products.Write the balanced chemical equation for the reaction.... more
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Chemistry

09/29/23

Using the data in the table, calculate both the mass and volume of n‑butyl alcohol required to completely react with 220.0 L of acetic acid.
As part of a team of chemists at a food flavoring company, you need to produce n‑butyl acetate (C6H12O2), a sweet-smelling food additive that occurs naturally in apples, pears, and bananas. Your... more
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Chemistry

09/29/23

Complete the table below.

Conjugate acid Conjugate Base formula Ka formula Kb ______ _____ C5H5N 1.7 x 10-9 H2CO3 4.5 x 10-7 _____ _____ HCN 4.9 x 10-10 _____ _____ Round each of your entries... more
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Chemistry

09/28/23

How many moles of CO2 are emitted into the atmosphere when 17.6 g C8H18 is burned?
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Chemistry

09/28/23

Determine the mass of 5.82 x1023 atoms CI. Answer in units of g.
Determine the mass of 5.82 x1023atomsCI.Answer in units of g.
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Chemistry

09/28/23

Combustion analysis of an unknown compound containing only carbon and hydrogen produced 2.277 g of CO2 and 1.161 g of H2O. What is the empirical formula of the compound?
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Chemistry

09/28/23

Determine the mass of 3.95 x 10^23 atoms Cl. Answer in units of g.
Determine the mass of 3.95 x 10^23 atoms Cl. Answer in units of g.
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Chemistry

09/28/23

complete the table below, Round each of your entries to 2 significant digits. You may assume the temperature is 25 C
Conjugate acid Conjugate Base formula Ka formula Kb H3BO3 5.8 x 10-10 ______ _____ H BrO 2.3 x 10-9 ______ _____ _____ _____ HCO3- 2.2 x 10-8
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Chemistry

09/28/23

Calculate the pH at 25 °C
Calculate the pH at 25 °C of a 0.99 M solution of trimethylammonium chloride ((CH3)3 NHCI): Note that trimethylamine ((CH3)4N) is a weak base with apKb of 4.19.Round your answer to 1 decimal... more
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Chemistry

09/28/23

what mass of (CH3)2 NH2 CI should the student dissolve in the (CH3)2NH solution

A chemistry graduate student is given 500. mL of a 0.90M dimethylamine ((CH3)2 NH) solution. Dimethylamine is a weak base with Kb = - 5.4 × 10-4 what mass of (CH3)2 NH2 CI should the student... more
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Chemistry

09/28/23

What mass of KCN should the student dissolve in the HCN solution
A chemistry graduate student is given 125. mL of a 0.90M hydrocyanic acid (HCN) solution. Hydrocyanic acid is a weak acid with K, = 4.9 x 10-10. What mass of KCN should the student dissolve in the... more
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Chemistry

09/28/23

Calculate the pH of the solution.
A solution is prepared at 25 °C that is initially 0.33 M in methylamine (CH3, NH2), a weak base with Kb = 4,4 x 10-4,, and 0.074 M in methylammonium bromide (CH3NH3Br). Calculate the pH of the... more
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Chemistry

09/28/23

Calculate the pH of the solution
A solution is prepared at 25 °C that is initially 0.42M in chlorous acid (HCIO2), a weak acid with Ka = 1.1 × 10-2, and 0.26M in potassium chlorite (KCI02)Calculate the pH of the solutionRound your... more
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Chemistry

09/27/23

Write the balanced complete ionic equation for the reaction when BaCl2 and Na2CO3 are mixed in aqueous solution
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09/27/23

What has a bigger nucleus a simple squamous epithelium or a stratified squamous epithelium? And why? What are the nucleus sizes of both simple and stratified squamous epithelium in micrometers?
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Chemistry

09/27/23

How many grams of iron (II) oxide can be produced from 3.4 g of iron in this balanced equation? 4Fe + 3O2 🡪 2Fe2O3
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Chemistry

09/27/23

Investigating Solution Concentration Using an Oscillating Reaction

You will prepare 100.00 mL of a solution with final concentration of 0.150 moles/L malonic acid solution CH2(COOH)2 and 0.0200 moles/L MnSO4You are provided: Solid malonic acid, CH2(COOH)2 0.145... more
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Chemistry

09/27/23

Investigating Solution Concentration Using an Oscillating Reaction
You will prepare 50.00 mL of a solution with final concentrations of 0.200 mole/L KIO3 and 0.0800 mol/L H2SO4 You are provided: • Solid potassium iodate, KIO3 • 0.625 moles/L H2SO4 stock solution.... more
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