Science 8, Test, Chapter 3 Flashcards Preview

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Flashcards in Science 8, Test, Chapter 3 Deck (15):
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Chemical Bond

-the combining of atoms to form molecules or compounds

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Ionic Compound

-a compound made of oppositely charged ions

2

Covalent Bond

-a chemical compound formed by the sharing of electrons

3

Acid

-any compound that increases the number of hydronium ions when dissolved in water

4

Indicator

-a compound that can reversibly change color depending on conditions such as pH

5

pH

-a value that is used to express the acidity and basicity (alkalinity) of a system

6

Neutralization Reaction

-the reaction of an acid and a base to form a neutral solution of water and a salt

7

Salt

-an ionic compound that forms when a metal atom replaces the hydrogen of an acid

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Organic Compound

-a covalently boned compound that contains carbon

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Hydrocarbon

-an organic compound composed of only hydrogen and carbon

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Lipid

-a type of biochemical that does not dissolve in water; fats and steroids are lipids

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Protein

-a molecule that is made up of amino acids and that is needed to build and repair body structures and to regulate precesses in the body

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Carbohydrate

-a class of energy-giving nutrients that includes sugars, starches, and fibers; composed of one or more simple sugars bonded together

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What are the properties of Ionic Compounds and why they act that way?

- Brittleness - Many Ionic Compounds are brittle at room temperature. Ionic Bounds break when they are shifted, the oppositely charged ions line up with other ions of the same charge. Since ions repel each other when they have the same charge, the substance breaks.
- High Solubility - Many Ionic Compounds are highly soluble due to the water molecules being attracted to the ions in the Ionic Compounds. Water also allows the ions to move freely around each other when dissolved.
- High Melting Points - Ionic Compounds/Bonds are very hard to separate because they attract each other since they have the opposite charges. These strong bonds help the Ionic Compound to stay bonded for high temperatures. This allows the Ionic Compound to have very high melting points.
- 3-Dimensional Formations - When Ionic Compounds are formed, they often form crystal lattices with that ion and ions with the opposite charge bond around it.

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What are the properties of Covalent Compounds and why they act that way?

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