418 Answered Questions for the topic chem

Chem

08/27/18

08/27/18

#### what is the structure of glutamic acid and lysine at pH 2 and pH 11?

what is the structure of glutamic acid and lysine at pH 2 and pH 11?
Chem

08/14/18

#### Using density as a unit conversion, calculate the volume of one ounce (30.0)g of gold.

Calculateting the volume
Chem

07/11/18

#### a sulfide of an element A, contains 3 atoms of S per formula unit and is 43.71% S. A) What is the formula weight of the compound? B) AxS3

plsssss help meee I really need the answer.

06/01/18

pH=2  pH=4
Chem

05/16/18

#### What is the mass of a sample of O2 gas?

Which has a pressure of 740. mmHg, at a temperature of 25 degree Celsius, in a volume of 250. mL?
Chem

05/16/18

#### At STP, what is the mass of 11.2 liters of O2 gas?

I tried solving this myself and got 16.0 g, but wasn't quiet to sure if I did the problem right.
Chem

05/11/18

#### How do I find the formula of Copper(1) Sulfide?

Please explain in detail the steps in order to solve this equation.
Chem Chemisty

04/25/18

#### calculate the molarity of 1270g of K2PO4 in 4.0 L aqueous solution

i do not know how to d0 it at all help
Chem

04/15/18

#### HOMEWORK WITH CHEMISTRY

For the elements with the electron affinities given in the table in the introduction, which element is most likely to accept an electron?SBeP
Chem

04/13/18

#### HOMEWORK HELP

What wavelength λ should the astrophysicist look for to detect a transition of an electron from the n=7 to the n=3 level?   value..... ; Units......
Chem

04/13/18

#### HOMEWORK WITH CHEMISTRY

Calculate the energy of a photon of electromagnetic radiation at each of the following wavelengths.Part A488.0 nm (wavelength of argon laser) Part B12.24 cm (wavelength of microwave oven) Part... more
Chem Gas Laws

03/17/18

#### Calculate the volume of co2 in l, produced when 300 g of butane is burned is burned completely in oxygen. The gas volume is measured at slc

I don’t understand how to find the mole using only the kg of butane

02/25/18

#### Whats the correct way to approach this concentration question?

Part I. Preparation of a Fe(III)-oxalate complex: (4 pts) a) Recorded mass of Fe(NH4)2(SO4)2●6H2O used: 1.3807 (g) b) pH paper color upon addition of oxalic acid: Magenta c) Does this color... more

12/24/17

#### AP Chemistry Question

Which of the following statements best explains why phosphorus ions tend to have a charge of -3?   (A) Phosphorus atoms want to gain 3 electrons in order to fill their p-subshell (B) Phosphorus... more

12/24/17

#### Which type of radiation would be most useful in examining the dimensionality of molecules?

(A) Ultraviolet (B) Visible (C) Infrared (D) Microwave

12/10/17

#### At a certain temperature, this reaction establishes an equilibrium with the given equilibrium constant, Kc.

At a certain temperature, this reaction establishes an equilibrium with the given equilibrium constant, Kc. 3A(g) + 2B(g) <------> 4C(g) Kc= 2.13x 10^17 If, at this temperature, 2.40 mol of... more

12/10/17

#### Calculate the [Zn2 ] in the solution if the cell potential, Ecell, is -1.061 V.

A Zn wire and Ag/AgCl reference electrode (E° = 0.197 V) are placed into a solution of ZnSO4. The Zn wire is attached to the positive terminal and the Ag/AgCl electrode is attached to the negative... more

12/10/17

#### Calculate the potential for each cell as shown below

Calculate the potential for each cell as shown below and indicate whether the metal electrode in the half-reaction opposite the standard hydrogen electrode, S.H.E., would be the anode or the... more

12/01/17

#### Categorize these solids as pure substance or mixtures.Categorize the pure substances as elements vs compounds and metals vs non-metals.

Sulfur Wooden splint Copper Powder Charcoal Selenium powder Steel Wool

09/18/17

#### Scientific notation

How would i put these numbers into scientific notation ?    3, 200, 000 = ?    0.000 98 = ?    0.079 = ?    6, 000 , 000 , 000 = ?    750 = ?

09/18/17

#### Chemistry name stating ( Metric )

How would i state the name of the following metric prefixes    1000 (1 x 10^3)    0.001 (1 x 10^-3)   0.1 (1 x 10^-1)    1,000,000 (1 x 10^6)    0.000, 001 (1 x 10^-6)
Chem

08/16/17

#### A student is given the question: "What is the mass of a gold bar that is 7.379 × 10–4 m3 in volume? The density of gold is 19.3 g/cm3."

The student obtains the answer through the following calculation:answer=7.379×10^−4 m^3×(100 cm/1 m)^3×19.3 g/cm^3For the above calculation, identify each value as one that is uncertain or known... more
Chem Chemistry

07/04/17

#### Calculate the concentration of sodium (gramsLgramsL) in sea water if a 1.80 liter sample of water contains 2.07 grams of sodium.

i need help. i think the answer is 1.15 but that is not right. 2.07/1.80= 1.15

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