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Chapter 4

Elements, Molecules, Compounds and Mixtures

QuestionAnswer
When matter changes form, like ice melting, but it stays the same substance that is a physical change
When matter is being described, such as it's density or shininess, then that is a physical property
When matter changes irreversibly, as in cooking, new chemical bonds can form, changing the substances and their properties, and it is a chemical change
Which type of compound helps us get and store energy? carbohydrates
Which type of compound are used to build new tissues, such as fingernails and muscle? proteins
What do carbohydrates, lipids, nucleic acids and proteins all have in common? they all contain carbon
Sugars and starches are the main types of ___? carbohydrates
In a chemical reaction, you start with ___A___ and end with ___B___. A - reactant(s) B - product(s)
True or False - When a powder is mixed with water, and it looks cloudy, it is a solution. False
Water is a good _____ since it can dissolve many substances. solvent
The three main elements that make up living things are: Carbon, Hydrogen, Oxygen
The four carbon compounds in living things are: Carbohydrates, lipids, proteins, and nucleic acids.
Many homes are heated with a compound called methane, or natural gas. Methane reacts with oxygen to produce carbon dioxide and water. The reactants in this reaction are _____________ and ____________. Methane and Oxygen
Many homes are heated with a compound called methane, or natural gas. Methane reacts with oxygen to produce carbon dioxide and water. The products in this reaction are _____________ and ____________. Carbon Dioxide and Water
Nucleic Acids are compounds made of long, repeating chains called nucleotides. _______ is a nucleic acid that contains the information cells need to make all of their proteins. DNA
The two basic forms of carbohydrates are sugar and starch
Created by: doakes27