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Chemistry

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Cortney Runolfsdotti...

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Cards in this guide (15)
An experiment for a new medicine was tested by two groups of people One group was given the medicine The other group was given a sugar pill The sugar pill serves as the

Control group, or simply control. Please study.

According to zinn what is his main purpose for writing A people's history of the US

Zinn's main purpose for writing A People's History of the United States was to give an accurate and detailed account of American history from the victim's point of view.

What is the base-dissociation constant for a weak base

Suppose: B- is symbol for any (soluble) base.

Equilibrium of a base when diluted in water:

B- + H2O <==> HB + OH-

Equilibrium constant:

Keq = [HB] * [OH-] / [B-] * [H2O]

The base dissociation contant is defined by:

KB = [HB]*[OH-]/[B-]

So, KB = Keq*[H2O] = Keq*55.6 mol/L

Why is Mandela in hospital

He was in hospital for a respiratory infection.

What information does an acid or base equilibrium constant give

The information an acid or base equilibrium constant gives is that the acidity and base levels are equal to the equilibrium constant multi[plied by the water concentration.

What information does the pH of a solution give

pH of a solution tells us about the nature of a solution( i.e acidic or basic ) if pH of a solution is less than 7 tahn it's acidic if it's 7 then it's neutral and more than seven will make it base.

Which of these correctly lists the order of the engineering process

Identify a need, research the background, make a plan, do the work, evaluate the results, look for improvements. (APEX)

What will happen when a reactant is added to a system at equilibrium

The equilibrium of the system will be upset.

What is the acid dissociation constant for an acid at equilibrium HX H X

The dissociation constant is:
k = [H][X]/[HX]

How is the H fusion used to calculate the mass of solid that 1kJ of energy will melt

1kj x 1/H fusion x g/mol solid

A scientist is using his knowledge of statistics to determine whether test results show that a composite drug has effectively counteracted allergy symptoms. What is the scientist doing

evaluating test results.

Scientist wants to make advances in the way skin cancer patients are treated what is something she should do first

look at the success rate of the current treatments

What equation is used to calculate the pH of a solution

pH = -log [H+(aq)]. In words, pH is the negative logarithm (to the base 10) of the hydrogen ion concentration.

A scientist has just developed a composite drug to fight seasonal allergies. What is the next step in the engineering process before the drug is released

Testing the composite drug in a trial run.

What equation is for pH

pH=-log[H+]

Edited: it is also pH = 14 - pOH. That is certainly an equation for pH.

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