Chemistry Concepts Quiz

Absolute Temperature

• A temperature reading relative to absolute zero
• Uses the unit of Kelvins

Absolute Zero

• The lowest possible temperature
• Atoms stop moving completely at this point (though bonds still vibrate slightly)

Accuracy

• How close a measured value is to the true value
• Example: If someone is six feet tall, measuring them as six feet one inch is fairly accurate. Measuring them as twelve feet is inaccurate.

Acid

• Substances releasing H+ ions in water
• Has a pH less than 7
• Dissolves metals like in water
• Turns litmus paper red and phenolphthalein colorless

Acid Anhydride

• An oxide that produces an acid when added to water
• Example: SO3 forms sulfuric acid (H2SO4) when combined with water

Acid Dissociation Constant (Ka)

• Ratio of conjugate base and acid concentrations when weak acid dissociates in water
• Example: if conjugate base is 0.5 M and acid is 10 M, Ka = 0.05

Activated Complex

• Intermediate state in a chemical reaction
• Reactants join together before becoming products

Activation Energy

• Minimum energy needed for a chemical reaction to occur
• Can be very small (like sparking gasoline) or very high (like burning magnesium)

Activity Series

• Arranging elements in order of their reactivity with water and acids

Actual Yield

• Amount of product actually produced in a chemical reaction
• Represents the amount you can weigh.

Addition Reaction

• Atoms add to a carbon-carbon multiple bond

Adsorption

• One substance collecting on the surface of another

Alcohol

• Organic molecule containing an -OH group

Aldehyde

• Organic molecule containing a -COH group

Alkali Metals

• Group I elements in the periodic table

Alkaline Earth Metals

• Group II elements in the periodic table

Alkane

• Organic molecule with only single carbon-carbon bonds

Alkene

• Organic molecule containing at least one C=C double bond

Alkyne

• Organic molecule containing at least one C≡C triple bond

Allotropes

• Different forms of an element in the same state
• Example: White and red phosphorus

Alloy

• Mixture of two or more metals
• Often stronger and harder than pure metals

Alpha Particle

• Radioactive particle equivalent to a helium nucleus (2 protons, 2 neutrons)

Test your knowledge on fundamental chemistry concepts including temperature, acidity, and chemical reactions. This quiz covers topics such as absolute temperature, acid dissociation constants, and the concept of activated complexes. Perfect for high school students or anyone looking to refresh their chemistry knowledge.