Science 8, Test, Chapter 3

Question 0

Ionic Compound

Answer 0

-a compound made of oppositely charged ions

Question 1

Chemical Bond

Answer 1

-the combining of atoms to form molecules or compounds

Question 2

Covalent Bond

Answer 2

-a chemical compound formed by the sharing of electrons

Question 3

Acid

Answer 3

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

Question 4

Indicator

Answer 4

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

Question 5

pH

Answer 5

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

Question 6

Neutralization Reaction

Answer 6

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

Question 7

Salt

Answer 7

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

Question 8

Organic Compound

Answer 8

-a covalently boned compound that contains carbon

Question 9

Hydrocarbon

Answer 9

-an organic compound composed of only hydrogen and carbon

Question 10

Lipid

Answer 10

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

Question 11

Protein

Answer 11

-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

Question 12

Carbohydrate

Answer 12

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

Question 13

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

Answer 13

• 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.

Question 14

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

Answer 14

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