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This chapter review covers the process of sodium hydroxide dissolving in water, the concept of metabolism, the role of molecules in inherited characteristics, isotopes, molecules and compounds, pH, chemical reactions, proteins, solutions, homeostasis, and the structure of atoms.
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Chapter 2 Review
What happens when sodium hydroxide dissolves in water? • It releases hydrogen ions • It releases hydroxide ions (c) It turns into a salt (d) It becomes more concentrated
What is metabolism? (a) all chemical changes that take place in an organism (b) the way organisms store energy (c) the way organisms release energy (d) a control system
Molecules that control inherited characteristics are called • nucleic acids • steriods • nitrogen molecules • lipids
The smallest particle of an element that has the element’s properties is a(n) • compound • molecule • atom • nucleus
Isotopes are atoms of the same element with the same number of protons and ? • a different number of electrons • a different number of molecules (c) a different number of neutrons (d) the same number of neutrons
What are molecules • units formed by ionic bonds • units formed by covalent bonds • compounds • pairs of negative ions
A substance with a pH of 11 is a(n) • acid • base • ion • salt
An atom that has an unstable nucleus is • Radioactive • not radioactive (c) a molecule (d) an ion
Proteins that speed up the chemical reactions in a cell are called • Enzymes • Sites (c) Casein (d) a complex substance
Fats, oils, and waxes are all • Foods • Carbohydrates (c) human energy sources (d) lipids
Which of the following describes what happens during a chemical reaction? • balance sheet • reactant (c) chemical equation (d) formula
During a chemical reaction, substances become new substance by the (a) appearance of new isotopes (b) breaking apart of atoms (c) elimination of isotopes (d) breaking or forming of chemical bonds
Which of the following is not a basic function of proteins in living things? • energy storage • defense against disease • movement • nutrition
Which of the following is the dissolving substance in a solution? • solute • mixture • solvent • dissolvant
Organisms use feedback loops to maintain • pheromones • homeostasis • metamorphosis • growth
What are the building blocks of protein? • nucleic acids • enzymes • amino acids • bases
Which of the following chemicals do insects use to communicate? • honey • pollen • antibodies • pheromones
What are three particles that make up an atom? • Protons, Neutrons and isotopes • neutrons, isotopes and electrons (c) positives, negatives, and electrons (d) protons, neutrons and electrons