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NIVEL AÑOS INTERMEDIOS

2 Partial Exam

ACADEMIC YEAR 2015

SAINT ANDREW´S SCHOOL SUBJECT: BIOLOGY Años Intermedios TEACHER: Sofía Paz

9TH GRADE: A B C D NAME:______________________________________ DATE:____________________ SCORE Saber: /100 Hacer: /100 Decidir: /100 This Exam has sections Section A: Knowledge (SABER) Section B: Analysis (HACER) Section C: Extended Answer Question (DECIDIR)

Section A: (Knowledge) Choose the letter of the BEST answer

1. One difference between Ionic Bond and

Covalent bond is a) Ionic bond is when atoms share electrons and Covalent bond is when atoms transferee electrons

b) Ionic bond are formed between three atoms and covalent bonds between 2 atoms

c) Ionic bond is when atoms transferee electrons and Covalent bond is when atoms share electrons

2. Which of the following properties of water is a result of hydrogen bonding? a) Cohesion b) Ability to dissolve substances c) Lower density of ice compared to

liquid water d) All of the above

3. Water molecule is formed by hydrogen and oxygen atoms. They form chemical bond. Which of the following statement is CORRECT for the bond formation? a) The hydrogen atoms transfer one

electron to the oxygen atom. b) The oxygen atoms transfer two electrons

to the hydrogen atoms. c) The oxygen atom shares one pair of

electron with each of the hydrogen atoms

4. If you dissolve sugar into water, sugar is the ______.

a) Ion b) Solute c) Solution 5. The partial negative charge at one end of a water molecule is attracted to the partial positive charge of another water molecule. What is this attraction called? a) Ionic bond b) Hydrogen bond c) Covalent bond


6. Water is transported in plant tissues against gravity due to which of the following properties? a) Adhesion b) Hydrogen bonding c) Cohesion d) Two of the above e) All of the above 7. Many mammals control their body temperature by sweating. Which property of water is most directly responsible for the ability of sweat to lower body temperature? a) Water's higher density than ice b) Water's ability to dissolve molecules d) The absorption of heat by the breaking of hydrogen bonds 8. The ionic bond of sodium chloride is formed when a) Chlorine gains an electron from sodium. b) Sodium and chlorine share an electron pair. c) Sodium gains an electron from chlorine.

9. Which of the following is a reason why water warms much more slowly than metal? a) Thermal energy doesn’t enter into the metal b) Water molecules repel heat d) Part of the thermal energy is consumed by braking the hydrogen bonds of water e) It takes more heat to raise the temperature of a given amount of metal 1o C than it does to raise the temperature of water 1o C. 10. Which of the following describes a hydrogen bond? a) The bond between hydrogen and oxygen within a molecule of water b) The bond between hydrogen in one water molecule and another hydrogen in a different water molecule c) The bond between hydrogen in one water molecule and oxygen in a different water molecule d) The bond between two hydrogen atoms within a molecule of water 11. Which of the following statements about water is false? a) Water molecules are polar b) It takes very little heat to change the temperature of water c) All living organisms contain water d) Ice is less dense than liquid water e) None; all these statements are true 12. Hydrogen bonding between water molecules is directly responsible for the fact that ice is less dense than water at 0 degree C. A) True B) False


Section B:

Analysis

a) Draw an example of two atoms forming an Ionic bond and two atoms forming a

covalent nonpolar bond.

Give this information about each atom: Element, number of protons and number of

electrons.

Ionic Bond:

Atom 1: Atom2: Atom 1: Atom 2:

Covalent:

Atom 1: Atom2: Atom 1: Atom 2:

b) Describe the relation between each pater property and the hydrogen bonds filling the table below.

Water´s property Relation with Hydrogen Bonds


Section C: Extended Answer Question: Application of Knowledge and Decisions

a) Explain the importance of water´s properties by giving an example of how each

one is vital for a living organism.

Criterios de Evaluación:

A) DOMINIO DEL TEMA

5-6 Explica de manera coherente cada una de las propiedades del agua y la

relaciona con la función específ ica de un organismo

3-4 Explica de manera coherente dos a tres de las propiedades del agua yla relaciona con la función específ ica de un organismo

1-2 Explica de manera coherente una propiedad del agua relacionándola con la

función específ ica de un organismo

Aprobación: 3

A) Conclusión y evaluación

5-6 Explica de manera coherente y fundamentada la importancia vital de cada propiedad del agua, a partir de los ejemplos planteados

3-4 Explica de manera coherente y fundamentada la importancia vital de dos o tres propiedades del agua, a partir de los ejemplos planteados

1-2 Explica de manera coherente y fundamentada la importancia vital de una propiedad del agua, a partir del ejemplo planteado

Aprobación: 3


b) Design an experiment. You have learned that attractions between water molecules

help move water through a plant. Design an experiment that would demonstrate that the

direction of this movement is from the roots to the leaves and not opposite

Criterios de Evaluación:

A) Conclusión y evaluación

5-6 Plantea un experimento coherente y verif icable, especificando materiales y método

3-4 Plantea un experimento coherente y verif icable, especificando materiales y/o método

1-2 Plantea un experimento coherente, especif icando materiales y/o método

Aprobación (3)

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