Atoms & Ions Properties of Water Carbon- based Chemical Reactions Enzymes

Question What distinguishes one element from another?

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

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

Answer 1 – 20 Electrons

Question 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 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 What is formed when an atom gains or loses electrons?

Answer 1 – 50 An Ion

Question What causes hydrogen bond to form between polar molecules?

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

Question 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 What term describes the sugar in the glass of lemonade?

Answer 2 – 30 solute

Question What is the pH of a neutral solution?

Answer 2 – 40 7

Question What is an acid?

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

Question How can you describe a polymer?

Answer 3 – 10 Poly means “Many” ---like a chain of paper clips Go to: ml#

Question 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 What kinds of bonds link the monomers in a protein?

Answer 3 – 30 Hydrogen bonds

Question What is the relationship between a momomer and a polymer?

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

Question In what kind of molecule are the instructions for building proteins stored?

Answer 3 – 50 Nucleic acid

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

Answer 4 – 30 Activation energy ssetGuid=90e3b996-b49f-4b86-8f7b- 4d83cf3a815c&fromMyDe=0&isPrinterFriendl y=0&provider=&isLessonFromHealth=0&prod uctcode=US&isAssigned=false&includeHeader =YES&homeworkGuid= ssetGuid=90e3b996-b49f-4b86-8f7b- 4d83cf3a815c&fromMyDe=0&isPrinterFriendl y=0&provider=&isLessonFromHealth=0&prod uctcode=US&isAssigned=false&includeHeader =YES&homeworkGuid

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

Answer 5 – 10 Enzyme and substrates

Question What happens to a catalyst during a chemical reaction?

Answer 5 – 20 It is not changed

Question How does a catalyst affect the activation energy of a chemical reaction?

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

Question What term describes the reactants that an enzyme acts on?

Answer 5 – 40 product

Question Which conditions are likely to affect the shape of an enzyme?

Answer 5 – 50 Both temperature and pH