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Chemistry

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Solon Thompson

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Cards in this guide (14)
What is a base

In chemistry, a base is the opposite of an acid. It has a pH higher than 7. When mixed with an acid it forms a neutral solution with a pH of 7.

acid + base = water + salt.

properties include: bitterness, slimy or soapy, and turns litmus paper blue.

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A base is also an article on which something stands or a military installation.

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In sports, a base is one of four plaques fixed to the ground (or other object designated for this function) that must be touched by a runner, without being touched by the ball that is in play, before he or she can score a point in the game.
Base: a substance which when added to water produces hydroxide ions [OH-].

Base Properties: When dissolved in water, bases Conduct electricity Change red litmus to blue Have a slippery feeling React with acids to neutralize their properties."

What does equilibrium mean

Total amounts of products and reactants are not changing.-- Apex

How would a catalyst change the reaction energy diagram
Answer

a catalyst speeds up the reaction

A catalyst can change the reaction energy diagram is that a catalyst speeds up the reaction.

What is the difference between a strong base and a weak base

A "strong" acid (or base) is one that dissociates completely in dilute aqueous solution. One which does not is a "weak" acid (or base). An acid with a pKa (or a base with a pKb) lower than about -2 is considered to be a "strong" acid.

Weak acids and bases can still be quite corrosive. HF is a "weak" acid with a pKa of around 3.2 (which corresponds to only about one molecule out of every 38 or so being dissociated), but it's pretty terrible stuff and will dissolve even glass.

How can meat be cooked

Meat can be cooked with anything that produces heat. Other methods for cooking meat can include "curing" which is done with salt rather than heat.

An increase in temperature will cause the rate of a chemical reaction to

increased temperture causes rate or reaction to increase.

What is always true of a weak acid

It will not dissociate 100% in water.

What is true of a Lewis base

A Lewis base donates electron pairs.

What is Ka for H2CO3 aq H aq HCO3 aq

Ka= [h+][HCO3-]/[H2CO3]

How does increasing the molality in th cells protect the animals

By increasing molality in certain chemicals within their cells they are protecting themselves from freezzing

A concentration unit expressed in units of moles of solute per kilogram of solvent

This is called molality.

What is the pOH of a solution whos OH- is 9.31 x 10-2 M

pOH = -log [OH-] = -log 9.31x10^-2 = 1.03 = pOH

What are the phase change processes taking place when a substance is in equlibrium between liquid and gas phase

This is boiling - liquid transformation in gas.

What equation shows how rate depends on concentrations of reactions

The equation is called the rate law equation. For the reaction aA+bB =>cC+dD the rate law would be rate = k[A]^m[B]^n where k is the rate constant and m and n are the "order" with respect to each reactant. m and n must be determined experimentally and may or may not be the same as the coefficients a and b.

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