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
B It releases hydroxide ions
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
(a) all chemical changes that take place in an organism
Molecules that control inherited characteristics are called nucleic acids steriods nitrogen molecules lipids
A nucleic acids
The smallest particle of an element that has the element’s properties is a(n) compound molecule atom nucleus
C atom
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
(c) a different number of neutrons
What are molecules units formed by ionic bonds units formed by covalent bonds compounds pairs of negative ions
B units formed by covalent bonds
A substance with a pH of 11 is a(n) acid base ion salt
B Base
An atom that has an unstable nucleus is Radioactive not radioactive (c) a molecule (d) an ion
A Radioactive
Proteins that speed up the chemical reactions in a cell are called Enzymes Sites (c) Casein (d) a complex substance
A Enzymes
Fats, oils, and waxes are all Foods Carbohydrates (c) human energy sources (d) lipids
(d) lipids
Which of the following describes what happens during a chemical reaction? balance sheet reactant (c) chemical equation (d) formula
(c) chemical equation
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
(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
A energy storage
Which of the following is the dissolving substance in a solution? solute mixture solvent dissolvant
C solvent
Organisms use feedback loops to maintain pheromones homeostasis metamorphosis growth
B homeostasis
What are the building blocks of protein? nucleic acids enzymes amino acids bases
C amino acids
Which of the following chemicals do insects use to communicate? honey pollen antibodies pheromones
D 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
(d) protons, neutrons and electrons
The tendency to maintain a stable internal conditions
Homeostasis
Sum of all chemical reactions in a body
Metabolism
Two or more elements chemically bonded
Compound
A compound that releases Hydrogen ions in water
Acid
Types of Uranium with a different number of neutrons
Isotope
Uniform mixture
Solution
How do enzymes help maintain homeostasis
Final Question
Final question How many amino acids are there.
20
Differences and similarities of compounds.
Terms to know Ionic bond Hydrogen bond Covalent bond Amino Acid Nucleic Acid Chemical Reactions pH scale