Biology – Chemistry of Life

Biology – Chemistry of Life

Question 1 - 10 • What distinguishes one element from another?

Answer 1 – 10 • The number of atoms in a sample of each element

Question 1 - 20 • What determines the properties of an element? • A) protons? • B) neutrons? • C) electrons?

Answer 1 – 20 • Electrons

Question 1 - 30 • How is an ionic bond formed between two atoms?

Answer 1 – 30 • An electrical force forms between oppositely charged ions. In other words—opposites attract to one another

Question 1 - 40 • What term describes a substance that is made when two or more different atoms bond together in a certain ratio? • A) element? • B) molecule? • C) compound?

Answer 1 – 40 • Compound

Question 1 - 50 • What is formed when an atom gains or loses electrons?

Answer 1 – 50 • An Ion

Question 2 - 10 • What causes hydrogen bond to form between polar molecules?

Answer 2 – 10 • The hydrogen atom in water molecules becomes negatively charged

Question 2 - 20 • Which of the following properties of water is not caused by hydrogen bonding? • A) pH • B) cohesion • C) adhesion • D) specific heat

Answer 2 – 20 • pH

Question 2 - 30 • What term describes the sugar in the glass of lemonade?

Answer 2 – 30 • solute

Question 2 - 40 • What is the pH of a neutral solution?

Answer 2 – 40 • 7

Question 2 - 50 • What is an acid?

Answer 2 – 50 • A compound that releases a hydrogen ion in water.

Question 3 - 10 • How can you describe a polymer?

Answer 3 – 10 • Poly means “Many” ---like a chain of paper clips • Go to: http://www.tvo.org/iqm/plastic/animations.html#

Question 3 - 20 • How is a saturated fatty acid different from an unsaturated fatty acid?

Answer 3 – 20 • Saturated fatty acids contain only carbon-carbon single bonds

Question 3 - 30 • What kinds of bonds link the monomers in a protein?

Answer 3 – 30 • Hydrogen bonds

Question 3 - 40 • What is the relationship between a momomer and a polymer?

Answer 3 – 40 • Monomers are linked together to form a polymer

Question 3 - 50 • In what kind of molecule are the instructions for building proteins stored?

Answer 3 – 50 • Nucleic acid

Question 4 - 10 • How do endothermic and exothermic reactions differ?

Answer 4 – 10 • Activation energy must be added to exothermic reations • Heat goes out in exothermic (ice cubes) • Heat goes in in endothermic (melting ice)

Question 4 - 20 • What are the reactants and the products in the following reaction? • 2H202 2H20 + O2

Answer 4 – 20 • Reactant is H202 • Products are: H20 and 02

Question 4 - 30 • What term describes the amount of energy that must be absorbed before a chemical reaction can start?

Answer 4 – 30 • Activation energy • http://app.discoveryeducation.com/player/?assetGuid=90e3b996-b49f-4b86-8f7b-4d83cf3a815c&fromMyDe=0&isPrinterFriendly=0&provider=&isLessonFromHealth=0&productcode=US&isAssigned=false&includeHeader=YES&homeworkGuid=

Question 4 - 40 • What is a catalyst?

Answer 4 – 40 • Substance that decreases activation energy and increases reaction rater in a chemical reaction without becoming part of the product.

Question 4 - 50 • What statement about chemical reactions and energy is correct? • Energy must be added to form new bonds • Or • Energy is released when new bonds are formed.

Answer 4 – 50 • Energy is released when new bonds are formed.

Question 5 - 10 • What are the parts that make up the lock-and-key model of enzyme function?

Answer 5 – 10 • Enzyme and substrates

Question 5 - 20 • What happens to a catalyst during a chemical reaction?

Answer 5 – 20 • It is not changed

Question 5 - 30 • How does a catalyst affect the activation energy of a chemical reaction?

Answer 5 – 30 • It lowers the activation energy of the reaction

Question 5 - 40 • What term describes the reactants that an enzyme acts on?

Answer 5 – 40 • product

Biology – Chemistry of Life