Other Chemistry Answers

The element platinum is commonly used as a catalyst to accelerate the rates of chemical reactions. How many atoms of platinum (Pt) are present in 85.50 grams of platinum? Report your answer to 3 significant figures.

A Photon has a wavelength of 698 nm. What is the frequency of the photon?

Calculate the concentration of all ionic species in a 0.25M solution of glutamic acid at pH 2.2, pH4. pH10. What is the net charge of glutamic acid at pH1, pH7 and pH 12? What is its isoelectric point? At what pH or pHs would this serve as a good buffer?

The rate constant of a first order reaction is 6.9×10^-3 s^-1. How much time will it take to reduce the initial concentration to it 1/8 th value?

The compound KCLO3 decomposes according to the following equation
@KCLO3-- 2KCL + 3O2
a) what is the mole ratio of KCLO3 to O2 in this reaction?
b) How many moles of O2 can be produced by letting 6.0 moles of KCLO3 react based on the above equation?
c) How many molecules of oxygen gas, O2, are produced in question 1b?
2. Magnesium combines with chlorine, Cl2 to form magnesium chloride, MgCl2 during a synthesis reaction.
a) write a balanced chemical equation for the reaction.
b) How many moles of magnesium chloride can be produced with 3 moles of chlorine?

A 0.10 M solution of HF has a pH of 2.10. Calculate the Ka of HF.

In a solution of glucose in water, what is the glucose?

A. Solvent. B. Suspension. C. Colloid. D. Solute

When a liquid in a closed container reaches a state of equilibrium with its vapor, which of the following is true?

A. The number of molecules in the vaper state and liquid state or equal.
B. The number molecules evaporating and condensing are equal.
C. The processes of the evaporation and condensation have ceased.
D. The liquid is at the boiling point.

Which of the following is true if two substances in the same phase are miscible?

A. They are completely soluble in each other.
B. They are partially suluble in each other.
C. They can be mixed together temporarily but settle out upon standing.
D. They do not dissolve in each other to any significant extent.