Which of the following is a trace element, required only in small amo.pdf

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Which of the following is a trace element, required only in small amounts by most living things? a. oxygen b. iron c. nitrogen d. carbon e. hydrogen An acid is a substance that a. dissolves in water. b. forms covalent bonds with other substances. c. donates hydrogen ions to solutions. d. is a versatile solvent. e. removes hydrogen ions from solutions. How an atom behaves when it comes into contact with other atoms is determined by its a. nucleus. b. size. c. protons. d. neutrons. e. electrons. Most of water\'s unique properties result from the fact that water molecules a. are very small. b. tend to repel each other. c. are extremely large. d. tend to stick together. e. are in constant motion. Atoms of different phosphorus isotopes. a. have different atomic numbers. b. have different numbers of neutrons. c. react differently with other atoms. d. have different numbers of electrons. e. have different numbers of protons. An ion is formed when an atom a. forms a covalent bond with another atom. a. forms a covalent bond with another atom. b. gains or loses an electron. c. becomes part of a molecule. d. gains or loses a proton. e. gains or loses a neutron. The smallest particle of water is a. an atom. b. a crystal c. an element. d. a compound e. a molecule. Why are biologists so interested in chemistry? a. Chemicals are the fundamental parts of all living things. b. Most chemicals are harmful to living things. c. They know little about life except the chemicals it is made from. d. If you underhand the chemistry of life. you can make a lot of money. e. Everything about life can be known by understanding its chemistry. Molecule are always moving. Some molecules move faster than others;___ is a measure of there average velocity of movement. a. Polarity b. heat c. temperature d. electronegativity e. density Which of the following holds atoms together in a molecule? a. ionic bonds between atoms b. transfer of protons from one atom to another c. sharing of electrons between atoms d. loss of neutrons by atoms e. sharing of protons between atoms Ice floats because a. it to colder than liquid water. b. its molecules are moving faster than in liquid water. C it to more dense than liquid water. d. its hydrogen molecules bond to the water surface film e. its water molecules are farther apart than in liquid water. Adding acid tends to______of a solution. a. increase the hydrogen ion concentration and raise the pH b. increase the hydrogen ion concentration and lower the pH c. decrease the hydrogen ion concentration and raise the pH d. decrease the hydrogen Km concentration and lower the pH e. c or d, depending on the original acidity Essay List the four elements needed by living things in large amounts, two others needed in moderate amounts, and two elements needed in trace amounts. Solution Answer:- 1:-Option b, Iron is trace element required in less than 1000mg/kg of dry matter 2:-option c, donates hydrogen ion to the solution. 3:-Option e, electrons determine.

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2:-option c, donates hydrogen ion to the solution.
3:-Option e, electrons determine how atoms combine.
4:- option d, tend to stick each other due hydrogen bonding.
5:- option b, have different number of nuetrons
6:-option b, gains or loses electron
7:-option e smalledt unit water is a molecule H2O.

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1. Elements are the primary types of matter. What make one element different from another? a The number of protons, electrons, and neutrons is different. b The number of neutrons is different. c The number of protons and neutrons is different. d The number of protons is different. 2.What is an element's atomic number ? a The number of protons and neutrons in one atom of the element. b The number of protons in an atom of the element. c The mass of one atom. d The order in which it was discovered. 3. What is the name for multiple atoms that are bonded together? 4. What is the difference between an atom and an ion? a An ion is an atom that does not have an equal number of electrons and protons, so it can have a negative or positive charge. b An ion has a higher atomic number than the corresponding atom, and must share its proton with a neutron. c An ion is an atom that turns into a anion or cation when it shares an electron with another element. d An ion is a charged atom that doesn't have the proper balance of neutrons and protons. 5. Match the chemical bond to it's definition: Question 5 options: a metallic b covalent ionic When atoms share electrons so that their outer electron shells are filled. When atoms lose an electron to another atom, balancing the charge of the two atoms. When electrons can flow from atom to atom. When the charge of an atom or a molecule is distorted by a neighboring atom or molecule, setting up a weak attraction between them. 6. When matter changes phase from a solid to a liquid, it is called: Question 6 options: a melting b freezing c condensation d sublimation 7. What needs to happen for a substance to change state from a gas to a liquid...or the opposite? a Pressure, temperature, or both can change. b Both pressure and temperature need to change. c Only pressure needs to change. d Only temperature needs to change. 8. What happens to liquid water at room temperature if the atmospheric pressure is reduced sufficiently? a It bubbles, releasing gases dissolved in the water. b It freezes at room temperature. c It boils/vaporizes at room temperature. d Nothing- boiling and freezing require temperature changes. a The number of protons, electrons, and neutrons is different. b The number of neutrons is different. c The number of protons and neutrons is different. d The number of protons is different..

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1. What types of bonding is illustrated in sharing of electrons? a. Covalent bond b.Polar covalent bond c.Ionic bond d.Hydrogen bond e. a and b 2. What is the relationship between polar covalent bonds and hydrogen bonds? a.There is no relationship between these two types of bonds b.The formation of hydrogen bonds induces the formation of polar covalent bonds c.The formation of polar covalent bonds creates the centers of partial positive and partial negative charge that are required for the weak electrostatic interactions associated with hydrogen bonds d.Both types of bonds directly use pairs of shared electrons e.Both types of bonds are based on electrostatic interactions. 3. What is the physical nature of the hydrogen bond? a. There is a strong electrostatic attraction between a positive charge and a negative charge. b. There is a weak electrostatic attraction between a positive charge and a negative charge. c. Two electrons are equally shared in a bonding orbital between the oxygen and the hydrogen atom. d. Two electrons are unequally shared in a bonding orbital between the oxygen and the hydrogen atom, such that a polar covalent bond is formed. e. None of the above. 4. What type of bonding is illustrated when electrons are transferred? a.Covalent b.Polar covalent bond c.Ionic bond d.Hydrogen bond e.None of the above 5. What common feature is shared by the sodium and chloride ions? a.Both ions have unpaired electrons in their outermost energy levels. b.Both ions have electrons in the third energy levels. c.Both ions have eight electrons in their outermost energy levels. d.Both ions have complete outermost energy levels, resulting in great stability. e.Both c and d are correct 6. What type of bonding is illustrated when electrons are shared unequally? a.Covalent bond b.Polar covalent bond c.Ionic bond d.Hydrogen bond e.None of the above 7. What feature of the bond between hydrogen and oxygen is most important in explaining how water can act as a powerful solvent? a.The electrons b.The atomic nuclei c.Ionic bonds d.Covalent bonds e.The unequal electron distribution that produces the partial positive andpartial negative charges associated with the hydrogen bond 8. What type of bonding is illustrated when the oxygen of one water molecule bonds with the hydrogen of another? a.Covalent bond b.Polar covalent bond c.Ionic bond d.Hydrogen bond e.None of the above 9. An atom\'s orbital with one electron combines with another atom\'s orbital that also contains one electron. What is produced? a.A bonding orbital containing two electrons b.A covalent bond c.A molecule d.A hydrogen bond e.Responses a, b, and c 10. How many electrons are associated with a single covalent bond between two atoms? a.Zero electrons b.One electron c.Two electrons d.Four electrons e.eight electrons 1. What types of bonding is illustrated in sharing of electrons? a. Covalent bond b.Polar covalent bond c.Ionic bond d.Hydrogen bond e. a and b 2. What is the relationship between po.

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Element= a substance composed of many “identical” particles called atoms. = the most basic substances that matter can be broken into by chemical means = the “ingredients” making up everything Chapter 5 – Water and Seawater What elements are in water? hydrogen (H) and oxygen (O) Information about all known elements is shown in the Periodic Table Electron (-) Proton (+) Neutron Nucleus Electron Shells The Parts of an Atom Atom = the smallest piece of an element that retains the properties of that element. Atoms contain two main parts and three types of subatomic particles Nucleus Protons Neutrons Electron Shells Electrons Figure 5.1, p. 130 Particle NameWhere FoundElectrical ChargeMass Y/N?OtherProtonNucleus+YesDetermines Type of elementNeutronNucleusøYes# can change for the same elementElectronElectron Shell-No# can change for the same element For an atom to be electrically neutral, # electrons = # protons http://www.vtaide.com/png/atom.htm Ion = an electrically charged atom. # of electrons (-) ≠ the # of protons (+) Negative ions (too many electrons) Positive ions (too few electrons) These will be attracted to each other. Oxygen O-2 Lithium Li+1 http://itc.gsw.edu/faculty/speavy/spclass/chemistry/ions.htm Compound = substance formed when two or more ions bond together. = different properties than the elements which formed it. = examples include water (H20) carbon dioxide (CO2) and halite or table salt (NaCl). Molecule = the smallest piece of a substance that retains the properties of that compound. Ex. NaCl = recipe for 1 molecule of salt Bonding = a group of processes that hold molecules together. = molecule “glue” Wicander and Monroe, @009, Essentials of Geology A Water Molecule is held together by covalent bonds = atoms in the molecule share electrons. 2H +1 + O-2 => H20 Garrison, 2012, Essentials of Oceanography Recipe for 1 molecule of water Water molecules are electrically neutral, but polarized. Their angular shape clusters the – charges on one side, and the + charges on the other side. Opposites still attract, so… http://www.free-extras.com/images/mickey_mouse-1101.htm A water molecule looks like Mickey Mouse, so they are electrically polarized. Fig.5.3, p. 131 Hydrogen bonds => The + end of one water molecule sticks to the – end of the next water molecule. http://www.qualityuswater.com/weregreen.htm Water has some special properties due to its polarized nature: Cohesion = water sticks to itself (hydrogen bonding) Surface tension = water has a thin “skin” on the surface can support light objects but they are NOT floating http://www.britannica.com/EBchecked/topic-art/575080/117360/Aluminum-coin-supported-by-the-surface-tension-of-water What causes surface tension? The molecules of a liquid are always trying to pull one another together. In the middle of a liquid, a molecule is pulled equally hard from all directions, so the attractive forces cancel out. But a molecule on the surfa ...

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Place all the characteristics of living organisms the answer box. Ch.pdf

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LABELING ACTIVITY 2 (Rs 1-10) 10 10. 12. 13 14, 15 16 62 circulatory system: Blood vessels l Laboratory 4 12 11-16 Solution 1.Celiac artery. 2.Common hepatic artery. 3.Right renal artery. 4.Abdominal aorta. 5.Renal artery. 6.Common iliac artery. 7.Internal iliac artery. 8.External iliac artery. 9.Deep femoral artery. 10.Popliteal artery. 11.Hepatic vein. 12.Renal vein. 13.Common iliac vein. 14.Internal iliac vein. 15.External iliac vein. 16.Femoral vein.

LABELING ACTIVITY 2 (Rs 1-10) 10 10. 12. 13 14, 15 16 62 circulatory .pdf

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Of 10 fish in a pond 4 are tagged. If three fish are caught and not thrown back into the pond what is the probability that fewer than two of them are tagged? Solution Binomial Distribution PMF of B.D is = f ( k ) = ( n k ) p^k * ( 1- p) ^ n-k Where k = number of successes in trials n = is the number of independent trials p = probability of success on each trial tagged (p) = 4/10 = 0.4 P( X < 2) = P(X=1) + P(X=0) = ( 3 1 ) * 0.4^1 * ( 1- 0.4 ) ^2 + ( 3 0 ) * 0.4^0 * ( 1- 0.4 ) ^3 = 0.648.

Of 10 fish in a pond 4 are tagged. If three fish are caught and not .pdf

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