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Ch 2 Chem of Life

QuestionAnswer
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