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Ch 2 Chem of Life
| Question | Answer |
|---|---|
| What is the Scientific Method? | Observe, ask questions, make inferences and hypotheses, conduct experiments, collect data and draw conclusions |
| What is a Hypothesis? | Possible explanations for a set of observations. |
| What is Observation? | The act of noticing and describing events or processes in an orderly way. |
| What is Inference? | A logical interpretation based on prior knowledge and experience. |
| What is a Theory? | Ties the hypothesis together. |
| What is a proton? | Macromolecule that contains carbon, hydrogen, oxygen and nitrogen needed by the body for growth and repair. |
| What is an electron? | Negatively charged particles, located in the space surrounding the nucleus. |
| What is an Ion? | An atom that has a positive or negative charge. |
| What is a solution? | A type of mixture in which all the components are evenly distributed. |
| Wha is a solvent? | Dissolving substances in the solution. |
| What is a solute? | Substance that is dissolved in a solution. |
| What is suspension? | Mixture of water and nondisolved material. |
| What is the maximum number of variables preferred with a controlled experiment? | Only ONE variable is changed. |
| What does the pH scale measure? | The concentration of H+ ions in a solution. |
| What does SI stand for? | Silicon |
| What is a buffer and what does it do? | It is a strong acid that reacts with strong acids. It prevents sharp, sudden changes in pH. |
| What is the smallest unit to be considered alive? | cells |
| Define Ionic bond. | Chemical bond formed when one or more electrons are transferred from one atom to another. |
| Define covalent bond. | Chemical bond in which electrons are shared between atoms. |
| Define hydrogen bond. | Chemical bond with a weak attraction between an hydrogen atom and any other atom. |
| Give an example of a lipid. | Oil |
| Give an example of a protein. | Meat |
| Give an example of a nucleic acid. | DNA or RNA |
| Give an example of a carbohydrate. | Potato |
| What is the manipulated variable of an experiment. | Independent Variable |
| What is the responding variable of an experiment. | Dependent Variable |
| What is the function of a nucleic acid? | Stores genetic information |
| Describe scientific data? | Detailed records of experimental observations. |
| What are the characteristics of all living things? | Genetic code, grow and develop, respond to environment, reproduction, stable internal environment, cells, evolve over time. |
| What is sexual reproduction? | Two parents unite to form the first cell of a new organism. |
| What is asexual reproduction? | A single organism produces offspring identical to itself. |
| What is the monomer of polysaccharides? | |
| What is the monomer of proteins? | |
| What is the monomer of lipids? | |
| What is the monomer of nucleic acids? | |
| Describe the properties of water molecules. | Water is one of the few compounds found in a liquid state of most of the Earth's surface. |
| Why is a water molecule considered polar? | Because it can changes its state of form from liquid to solid. |
| What is a catalyst? | A substance that speeds up the rate of a chemical reaction. |
| What does a catalyst do? | Lowers a reaction's activation energy. |
| What is an example of a biological catalyst? | An Enzyme is an example of.... |
| What is a chemical compound? | A substance formed by the chemical combination of two or more elements in definite proportions. |
| What is the main source of energy for all living things? | The sun. |
| Give at least 5 of the 8 characteristics of all living things. | 5 of the 8 are: Genetic code, grow and develop, respond to environment, reproduce, made of cells. |
| Describe and detail a chemical reaction. | Process that transforms one chemical into another. |
| How can cell cultures be used in scientific studies? | Scientists can watch cells grow, respond to the environment, and reproduce. |
| Describe the difference of an acidic and basic solution. | Alkaline solutions contain lower concentrations of H+ ions. |
| What are the differences between adhesion and cohesion? | Adhesion is an attraction between molecules of different substances. Cohesion is an attraction between molecules of the same substance. |
| How do you test a hypothesis? | Design an experiment that will track the variables. |
| Know a chart on measurements and be able to convert measurements. | |
| Know a chart over pH. |
Created by:
gmasters
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