Glucokinase is an quotisozymequot of hexokinase this means that they catalyze the same chemical reaction the phosphorylation of glucose depicted below The membrane transporters that move glucose...

Activity 3 Reactions on the Go The law of conservation of mass is a scientific law popularized and systematized by the 18 th-century French chemist Antoine Lavoisier According to this law matter cannot be created nor destroyed-it can only be changed This means that for substances undergoing chemical reaction its total mass before a chemical reaction takes place and after a chemical reaction had occurred are the same

1) Which of the following is NOT part of a chemical change or reaction a creation of new atoms and substances b formation of new bonds between atoms c breaking of bonds between atoms of reactants 2) How would you describe the chemical reaction depicted in the equation below NH3+ HCl leftharpoons NH4 C a It is a chemical reaction that is reversible a It is a chemical system yields a solid product c The reactants need to be subjected to heat to react d The chemical reaction requires a catalyst to proceed 3) The process of digestion breaks down protein from meat into its component amino acids What type of chemical reaction is this a synthesis c single displacement b decomposition d double displacement 4) Why is a change in intrinsic properties (such as color odor or taste) a sign that a material has undergone a chemical reaction a Changes in odor color or taste are associated with catalysts b The intrinsic properties always change during a physical change c It signifies that the substances in the material remained the same 5) Which of the following statements is NOT true about the chemical reaction depicted below 6 CO2( g)+6 H2 O( l) sunlight C6 H12 O6( s)+6 O2( g) a This chemical reaction is irreversible b The products are carbon dioxide and water c Sunlight is required for the reaction to happen d One of the products is in a solid physical state 6) Evaluate the chemical system below HCl+ NaOH arrow NaCl+ H2 O How should we categorize this reaction This should be categorized as a reaction a combustion b decomposition 7) Which of these does NOT involve a burning a stack of firewood c single displacement d acid-base neutralization hemical change c ice melting into liquid water d a seedling growing into a tree 21 Page 8) What best describes a catalyst a It is one of the reactants b A catalyst is a product of a chemical reaction c The chemical reaction may not happen without a catalyst 9) How do we know if a chemical reactions type is combustion It is a combustion type of chemical reaction if I it is a reversible reaction II it involves an acid and a base III its products include carbon dioxide and water ll a I and II b II and III hydrocarbon and oxygen gas 10) Which is a correct interpretation of the chemical equation below 2 Mg( s)+ O2( g) xrightarrow 2 MgO( s) a This reaction is reversible b The physical state of the product is liquid c Heat is needed for the reaction to proceed Oxygen gas is a catalyst for the chemical reaction 11) In mitosis a single parent cell divides into two daughter cells The starting material is a cell and the end products are two cells What type of change does this process involve and why This involves a qquad change because the qquad a chemical cells convert floating substances in the cytoplasm into new cell material b physical daughter cells have the same intrinsic properties as the original parent cell c chemical daughter cells have different intrinsic properties from the original parent cell d physical cell collect new cell material from the cytoplasm without rearranging their atoms 12) Why can a combustion reaction be loosely considered a decomposition reaction a This type of reaction needs a catalyst b The reaction requires oxygen gas as a reactant c A combustion reaction requires heat in order to proceed d It breaks down longer hydrocarbons into simpler substances 13) How do we describe a reversible chemical reaction It is a chemical reaction in which a reactants form products but the products cannot form back the reactants b reactants form products and the products react to form back the reactants c the molecules of the products are much smaller than those of the reactants d the molecules of the reactants are much smaller than those of the products 14) Why are phase changes considered physical changes a They do not exhibit any evidence of chemical change b The composition of a substance changes in a phase change c Only the form of the substance is changed and not its composition d A phase change involves a drop or rise in the temperature of a substance 22 Page 22 15) Which of the following is NOT an example of a single displacement chemical reaction a

An experimenter wishes to know if strong doses of glucose can improve performance on an intelligence test He gives an IQ test to a random sample of school children twice to each child One time with each child the test is taken after a large dose of glucose The other time with the same child the test is taken without a prior dose of glucose (The experimenter uses two equivalent forms of the same 1Q test) Which statistic should he use

The amount of precipitate formed will be less than expected In a chemical reaction involving the formation of a precipitate the stoichiometric ratio of the reactants is crucial to determine the amount of precipitate formed In a chemical reaction the reactants combine in specific ratios according to their chemical formula If the reaction is stoichiometric it means that the reactants combine in exact whole number ratios If there39s an excess of one reactant it may not fully react with the other leading to a difference in the amount of product formed This constitutes a random errorSimplify this slightly but keep core concepts