Questions #1 1.What happens to reactants during a chemical reaction? A. They are unaffected by the chemical reaction. B. They are created from the products of the reaction. C. They are used up to create the products of the reaction. D. They form catalysts that speed up the reaction.

#2 2. What is the general formula for an exothermic reaction? A. Reactants + Heat  Products. B. Reactants  Products + Heat. C. Reactants - Heat  Products. D. Reactants + Products  Heat.

#3 3. Any chemical that speeds up a chemical reaction is called a(n) A. catalyst B. product C. reactant D. activator

#4 4. Which statement about enzymes is true? A. Enzymes are reactants in the reactions they control. B. Enzymes are used up in the reactions they control. C. Enzymes are highly specific for particular reactions. D. Enzymes are not very efficient in speeding up reactions.

#5 5. Which statement is most correct about elements? A. Elements are made up of two or more atoms B. Elements only exists in a solid form C. Elements are made up of only one type of atom D. Elements are soluble

#6 6. Chemical reactions are usually faster A. in the presence of catalysts B. at higher concentrations of reactants C. when reactants are toxic chemicals D. in the absence of catalysts

#7 7. The four types of organic compounds that we studied are A. water, carbon dioxide, glucose, and DNA B. lipids, carbohydrates, saturated fatty acids, and amino acids C. monosaccharides, nucleotides, oils, and water D. lipids, carbohydrates, nucleic acids, and proteins

#8 8. Enzymes speed up chemical reactions by A. adding activation energy to the reactants B. removing the products that form in the reaction C. lowering the activation energy needed for the reaction D. doing all of the above

#9 9. An enzyme-substrate complex is formed when A. an enzyme attaches to tissues B. an enzyme binds with substrates C. an enzyme produces substrates D. an enzyme reacts with products

# The transparency of water is important for water organisms because it lets light pass through for A. condensation B. respiration C. neutralization D. photosynthesis

# A water molecule is polar because parts of the molecule have differences in A. electrical charge B. metabolism C. temperature D. density

# The tendency of water molecules to be cohesive explains why A. rain falls as drops B. water has a low boiling point C. ice is denser than liquid water D. water melts at 32°C

# BONUS TIME!!!!! List the four organic compounds and their monomers…. 1. carbohydrates  monosaccharides 2. lipids  fatty acids & glycerol 3. proteins  amino acids 4. nucleic acids  nucleotides

# Water molecules naturally dissociate to form A. hydrogen ions & oxygen ions B. hydrogen ions & hydroxide ions C. oxygen atoms & hydroxide ions D. hydroxide atoms & hydrogen ions

# What characteristic of a solution does pH measure? A. Water concentration. B. Base concentration. C. Hydronium or hydrogen ion concentration. D. Solvent concentration.

# A solution that is ten times as acidic as pure water has a pH of A. 70 B. 7 C. 6 D. 0.7

# OH NO???!!!!! BONUS TIME Label parts 1,2,and 3 and name the molecule… Phosphate group Nitrogenous base 5-C sugar

# A chemical compound may be very different from the substances that formed it. T = true F = false

# In organisms, exothermic reactions are reactions that absorb energy. T = true F = false

# Chemical reactions that consume energy are called endothermic reactions. T = true F = false

# Only endothermic reactions need activation energy to get started. T = true F = false

# The oxygen atom of a water molecule is positively charged. T = true F = false

# Solids cannot be solvents. T = true F = false

#24 24.Any process that changes some chemical substances into others is called a(n) __________ reaction. A. combustion B. chemical C. synthesis D. decomposition

# LAST ONE!!!!!!!! What properties of water allow it to have capillarity????? Cohesion & Adhesion

# Which substance is the least basic? A. Blood B. Hydrochloric acid C. Drain Cleaner D. Milk

#27 27.Chemical compounds that have the same chemical formula but are chemically structured differently A. Isotopes B. Isomers C. Ions D. Isotonics

# I carry the coded instructions for making proteins A. Amino acids B. Ribonucleic acids C. Deoxyribonucleic acid D. Nucleotides

#29 29.Hydrogen ions have a __________ electrical charge. A. positive B. negative C. neutral D. none of the above

#30 30.In a sugar water solution, sugar is the ________. A. solvent B. polar C. ion D. solute

#31 31.Oil does not mix with water because oil is strongly __________. A. polar B. nonpolar C. basic D. acidic

#32 32.Hydroxide ions have a __________ electrical charge. A. positive B. negative C. neutral D. none of the above

#33 33.A substance with a high hydroxide ion concentration is called a base. T = true F = false

# I am solid at room temperatures A. trans-fats B. unsaturated fats C. polyunsaturated fats D. saturated fats

# Another name for the lock-and-key model is ___________. A. capillary action B. activation energy C. enzyme-substrate complex D. enzyme-product complex

# This is why sugar molecules can dissolve in water…. A. sugar molecules are polar B. water molecules are nonpolar C. sugar molecules are nonpolar D. water molecules are solutes.

# The acidic side of the pH scale has more hydroxide ions. T = true F = false

# I am 10,000 times more basic than pure water, my pH is…. A. 11 B. 3 C. 12 D. 4

# The chemical equation for an endothermic reaction is….. A. Reactants + Heat  Products. B. Reactants + Products  Heat. C. Reactants - Heat  Products. D. Reactants  Products + Heat.

# In class we discussed ____ properties of water. A. 10 B. 3 C. 8 D. 5