Question | Answer |
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 |