Glencoe 7th Grade Chapter 21 Substances Mixtures and Solubility

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Vocabulary South Carolina Standard Course of Study 7-5 The student will demonstrate an understanding of the classifications and properties of matter and the changes that matter undergoes. (Physical Science)

Substance

(p. 592) - Matter that has the same composition and properties throughout.

Heterogeneous Mixture

(p. 593) - Type of mixture where the substances are not evenly mixed.

Homogeneous Mixture

(p. 594) - Type of mixture where two or more substances are evenly mixed on a molecular level but are not bonded together.

Solution

(p. 594) - Homogeneous mixture whose elements and/or compounds are evenly mixed at the molecular level but are not bonded together.

Solute

(p. 594) - substance that dissolves and seems to disappear into another substance.

Solvent

(p. 594) - Substance that dissolves the solute.

Precipitate

(p. 594) - solid that comes back out of its solution because of a chemical reaction or physical change.

Aqueous

(p. 598) - solution in which water is the solvent.

Solubility

(p. 601) - measure of how much solute can be dissolved in certain amount of solvent.

Saturated

(p. 602) - describes a solution that holds the total amount of solute that it can hold under given conditions.

Concentration

(p. 603) - describes how much solute is present in a solution compared to the amount of solvent.

Acid

(p. 606) - Substance that releases H+ ions and produces hydroxide ions when dissolved in water.

Hydronium ions

(p. 606) - hydrogen ion combines with a water molecule to form a hydronium ion, H3O+.

Base

(p. 609) - substance that accepts H+ ions and produces hydroxide ions when dissolved in water.

pH

(p. 610) - Measure of how acidic or basic a solution is, ranging on a scale from 0 - 14.

Indicator

(p. 612) - Compound that changes color at different pH values when it reacts with acidic or basic solutions.

Neutralization

(p. 612) - Reaction in which an acid reacts with a base and forms water and a salt.

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