J.R. S.

Chemistry

09/02/22

acetone is a common solvent and has a density of 0.7899 g/ml. What volume of acetone, in mL has a mass of 37.0 g?

Answer with steps

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Biology Chemistry Biochemistry

09/02/22

Identifying Bond Type Lab Write up

Identifying Bond Type Lab Write upChoose one of the substances that you tested. Then, answer all the following questions. Your answer should include at least five complete sentences. Which... more

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Chemistry

09/02/22

Chemistry reaction (NAOH + HF --> NAF + H2O)

Experts, i'll need some help over this question please: Calculate the pH of a solution obtained by adding 4.0 g of NaOH (s) to 1.0 L of 0.1 M HF solution (ignore volume changes).A. 13.0B. 9.8C.... more

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Chemistry

09/02/22

Chemistry Gas Question

Dear experts,I'm having issue answering this question, any help will be appreciatedA solution of H2 (1.00 g) and He (5.00 g) occupies a volume of 5.00 dm3 at 20 ° C. Indicate thetotal moles of the... more

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Chemistry

09/02/22

A specific brand of gourmet chocolate candy contains 7.00 g of dietary fat in each 22.7- g piece. How many kilograms of dietary fat are in a box containing 4.00 lb of candy?

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Chemistry

09/02/22

Chemistry of nursing student

A 10.0 ml solution contains 0.75 mg of drug per ml of solution. The recommended dosage of this drug is 0.15 mg per kg of body weight. How many milliliters of this solution do you need to administer... more

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Chemistry

09/02/22

One component of a metal sculpture consists of a solid cube with an edge of lenth 29.cm. The alloy used to make the cube has density of 7210 kg/m^3. Find the cube's mass

I have been given a formula but I calculated wrong

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Chemistry

09/01/22

Into to Chemistry

Iron has a density of 7.86 g/cm37.86 g/cm3 (1 cm3=1 mL1 cm3=1 mL). Calculate the volume (in dLdL) of a piece of iron having a mass of 4.96 kgkg . Note that the density is provided in different... more

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Science Chemistry Biochemistry

09/01/22

A pharmacist is to prepare 300 g of an ointment containing 50 mL of glycerin. The density of glycerin is 1.25 g/mL.

What is the % w/w of this preparation?

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Chemistry Biochemistry Organic Chemistry

09/01/22

A pharmacist is asked to compound a 200 mL mixture containing maldroxyl 50 mL, diphenydramine elixir 50 mL, and viscous lidocaine 2%.

How much viscous lidocaine 2% is needed to prepare the order?

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Chemistry Biochemistry Organic Chemistry

09/01/22

What is the final concentration (w/w) of zinc oxide ointment when 250 g of a 2.5% zinc ointment and 300 g of a 5% zinc oxide ointment are mixed?

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Chemistry

09/01/22

Need help with this

Write the empirical formula for at least four ionic compounds that could be formed from the following ions:PO4^3-, Fe^3+, Pb^4+, CN^−

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Chemistry

08/31/22

Chemical reactions question

Dear experts,Im having trouble answering this question:In a balanced chemical reaction the weighttotal of reagents compared to that of products:1) is lower if gaseous products are formed2) may be... more

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Chemistry

08/31/22

Confused on how to do this

Write the empirical formula for at least four ionic compounds that could be formed from the following ions: NO−3, Fe3+, Fe2+, ClO−3

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Chemistry

08/31/22

Confused on this question

Read each description in the first column of the table below. If any chemical element with atomic number of 92 or less matches the description, check Yes and enter the chemical symbol of an element... more

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Chemistry Organic Chemistry

08/30/22

Chemistry 301: Separate the Valence electrons from the core electrons.

Specify which of the chlorine orbitals are core and valence electrons. You may select more than one choice for each item.1s12s23s22p63p5

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Chemistry

08/28/22

What is the Theoretical Yield of Caffeine Salicylate if we start with 50 mg of Caffeine and an excess of Salicylic Acid.

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Chemistry

08/28/22

How much energy in kilocalories would combustion of 0.740 ounces of methane release?

I need to express it in 3 significant figures

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Chemistry

08/27/22

the study of gas behavior helped establish early chemistry as a legitimate field of science

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Chemistry Biochemistry

08/26/22

Given the information that follows, calculate the concentrations of all molecular and ionic species, and the pH in aqueous solutions

Given the information that follows, calculate the concentrations of all molecular and ionic species, and the pH in aqueous solution.A) 0.01M acetic acid B) 0.25M ammonium chloride I don't even know... more

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Chemistry Biochemistry

08/26/22

Calculate the pH of an aqueous solution of the following:

2 x 10^-8 M KOHSo, for this I am getting the -log(2x10^-8) and I am getting 7.69 but the answer is suppose to be 7.1?Could anyone show how they get to the correct answer? I think I am doing... more

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Chemistry

08/25/22

Multiply or divide the following measurements. Be sure each answer you enter contains the correct number of significant digits.

20.9476 mol/L X 25. L= [ ] mol250.21 m /34.34 s= [ ] m/s.934 mol/L X .40L= [ ] mol

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Chemistry

08/25/22

Multiply or divide the following measurements. Be sure each answer you enter contains the correct number of significant digits.

20.9476 g/mL X 40. mL = [ ] g2.09476 cm X 2.25 cm = [ ] cm^2806.18 mol / 0.54 L = [ ] mol/L

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Chemistry

08/25/22

Calculate the rate constant, 𝑘 , for a reaction at 52.0 °C that has an activation energy of 79.6 kJ/mol and a frequency factor of 1.05×1011 s−1.

K=

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Chemistry

08/25/22

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 825.0 K? 𝑘=

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 825.0 K?𝑘=

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Answers •1

acetone is a common solvent and has a density of 0.7899 g/ml. What volume of acetone, in mL has a mass of 37.0 g?

Identifying Bond Type Lab Write up

Chemistry reaction (NAOH + HF --> NAF + H2O)

Chemistry Gas Question

A specific brand of gourmet chocolate candy contains 7.00 g of dietary fat in each 22.7- g piece. How many kilograms of dietary fat are in a box containing 4.00 lb of candy?

Chemistry of nursing student

One component of a metal sculpture consists of a solid cube with an edge of lenth 29.cm. The alloy used to make the cube has density of 7210 kg/m^3. Find the cube's mass

Into to Chemistry

A pharmacist is to prepare 300 g of an ointment containing 50 mL of glycerin. The density of glycerin is 1.25 g/mL.

A pharmacist is asked to compound a 200 mL mixture containing maldroxyl 50 mL, diphenydramine elixir 50 mL, and viscous lidocaine 2%.

What is the final concentration (w/w) of zinc oxide ointment when 250 g of a 2.5% zinc ointment and 300 g of a 5% zinc oxide ointment are mixed?

Need help with this

Chemical reactions question

Confused on how to do this

Confused on this question

Chemistry 301: Separate the Valence electrons from the core electrons.

What is the Theoretical Yield of Caffeine Salicylate if we start with 50 mg of Caffeine and an excess of Salicylic Acid.

How much energy in kilocalories would combustion of 0.740 ounces of methane release?

the study of gas behavior helped establish early chemistry as a legitimate field of science

Given the information that follows, calculate the concentrations of all molecular and ionic species, and the pH in aqueous solutions

Calculate the pH of an aqueous solution of the following:

Multiply or divide the following measurements. Be sure each answer you enter contains the correct number of significant digits.

Multiply or divide the following measurements. Be sure each answer you enter contains the correct number of significant digits.

Calculate the rate constant, 𝑘 , for a reaction at 52.0 °C that has an activation energy of 79.6 kJ/mol and a frequency factor of 1.05×1011 s−1.

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 825.0 K? 𝑘=

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