EXAMEN MATERIA.

EJERCICIO 1 (Parte examen teoría)

1. Which of the following is an example of ´´inquiry-based learning model of teaching``?

a) The new scientific knowledge is built over the previously learnt knowledge.
b) Students learn the scientific contents provided by scientists.
c) Students are encouraged to ask questions and formulate their own tentative
answers.
d) Teaching and learning are just a transmission of knowledge form the teacher
to student.

2. The weight of an object is most accurately described as the:

a) Measure of the amount of matter contained is an object.
b) Volume of the object multiplied by its density.
c) Force on an object due to the gravitational pull of the Earth.
d) Mass of an object dived bi its volume.

3. The value of a physical quantity…

a) Is expressed by a number.
b) Is expressed as the product of a number and a unit.
c) Is expressed by the unit.
d) Depends of its nature: base quantities are expressed as the product of a
number and a unit, while derived quantities…
4. The following experiment was conducted in the lab: 100mL of water was added to
beaker. A thermometer was placed inside the water and held from the stand. The
water was warmed up until boiling. Temperature was registered every 30 seconds and
a temperature vs time plot was made (as the shown below). Based on the obtained
results, we weight conclude that:

a) The thermometer was not calibrated, since water boils at 100ºC.

b) The pressure of the lab was below the atmospheric pressure (below 760
mmHg)
c) The pressure of the lab was above the atmospheric pressure (over 760mmHg)
d) We have not wait enough time to allow the water reach 100ºC.

5. Which of the following describes a major contribution of Isaac Newton to the

development of modern science?
a) Newton offered a mechanical model of the cosmos in a set of mathematical
laws.
b) Newton merged the water and particle theories of light.
c) Newton developed the heliocentric theory of the solar system.
d) Newton stated three laws that allowed to describe the planetary motion.
6. The Kepler´s law of Planetary Motion establish: ¿?
a) All planets move around the Sun in elliptical orbits (the Sun is in the center),
when the planet is passing close to the Sun moves slower and the planets
orbiting far away from the Sun have longer years.
b) All planets move around the Sun in elliptical orbits (The Sun is in one of the
foci), when the planet is passing close to the Sun moves slower and the planets
orbiting far away from the Sun have longer years.
c) All planets move around the Sun in elliptical orbits (the Sun is in one of the
foci), when the planet is passing close to the Sun move faster and the planets
orbiting close to the Sun have shorter years.
d) All planets move around the Sun in elliptical orbits (the Sun is in one of the
foci), when the planet is passing close to the sun moves faster and the planets
orbiting far away from the Sun have shorter years.

7. Students were asked to build a Sundial For the city of Caceres (latitude 39º). What
value should the angle ´´A`` have?

a) 39º
b) 51º
c) 141º
d) 45º

8. In order to use the quadrant to measure the height of tree (H), we have to keep in mind
that:

a) H=D x cos(alfa) + observer height.

b) H=D x sin(alfa) + observer height.
c) H=D x tg(alfa) + observer height.
d) H=D + observer height.

9. Which of the following is an example of pure substance as opposed to a mixture?

 a) Alcohol.
b) Milk.
c) Gasoline.
d) Blood.

10. Table salt is an example of which of the following types of matter?

a) Alloy.
b) Compound.
c) Element.
d) Homogeneous molecule.

11. A unit of concentration commonly used in chemistry is the weight percent. Which of
the following correctly represents weight percent?
a) (Weight solute) / (weight solution) x 100%
b) (Weight solution) / (weight solvent) x 100%
c) (Weight solute) / (weight solvent) x 100%
d) (Weight solute) / (weight solution + weight solute) x 100%
12. Knowing that the saponification index of the olive oil is 0.134. What amount of NaOH is
needed to saponificate 250 grams of oil?
a) 0.134g of NaOH per every mL of oil.
b) 0.134g of NaOH per every gram of oil.
c) 1/3 of the grams of oil used.
d) 6.67 grams of NaOH.

13. An egg is introduced in a glass of water observing that the egg sinks. In a second
experiment, the egg is place in a glass containing unknown homogenous solution
observing that the egg floats. We conclude that:
a) The density of the egg is lower than the density of both liquids.
b) The density of the water is lower than the density of the unknown fluid.
c) The density of the egg is higher than the density of the unknown fluid.
d) The density of the egg and the unknown fluid is the same.

14. Which of the following is the best example of a physical change?

a) A copper pipe becomes stained with green tarnish over serval years.
 b) The yolk of an egg hardens as it is cooked.
c) Water droplets form on a cold soda bottle on a humid summer day.
d) Bread dough rises in a warm kitchen.

15. When a compound in the liquids state vaporize and become a gas, which of the
following characteristics of the compounds remains the same?
a) Distance between the molecules.
b) Chemical composition of the substance.
c) Kinetic energy of the molecules.
d) Density of the substance.

16. Which of the following type of chemical transformation is characterized by a substance

reacting with oxygen?
a) Combustion.
b) Neutralization.
c) Fermentation.
d) Decomposition.

17. An outdoor iron railing rusts after several years. The rust on the railing is due to:
a) The elemental iron that has separated from the railing as the results of the
temperature fluctuations.
b) The oxidation reaction that has taken place between the railing with the
oxygen of the air.
c) The product of broken chemical bonds between iron and oxygen atoms that
make up the railing.
d) The chemical reaction of water in the atmosphere with the railing.

18. A child rubs a balloon against a wool sweater on a dry winter day. The child then finds
that the balloon sticks to a wall for several minutes before fallowing. Which of the
following diagrams best represents the charge distribution on the surfaces and the
wall?
c) Neutrons and electrons.
 19. Several lights are connected in a parallel circuit and one of the lights burns out. Which
of the following describes how the burning out of the light affects to other lights in the
parallel circuit?
a) Charge still flows through the burned-out light, providing the lights in the
other branches of the circuit with electricity.
b) The other lights continue to draw the same current since nothing is affected in
those branches of the circuit.
c) Current is increased in the other branches of the circuit so the light will
brighten as a result of the increased flow of charge.
d) The branches of the circuit draw less charge overall because the burned-out
light no longer draws a charge, reducing the brightness of the lights.

20. Regarding the three types of levers:

a) In a first-class lever, the load or resistance is between the fulcrum and the
effort.
b) In a second-class lever, the fulcrum is located next to the resistance.
c) In a second-class lever, the effort is located in the middle.
d) In a third-class lever, the resistance is located between the fulcrum and the
effort.

EJERCICIO 2. (Parte examen teoría)

A science teacher asks to the students to find out the density of a unknown solution. One of
the students comes to the idea to use the Archimedes principle to get the solution. The
students do the following steps: First, weight a cylindrical object, it was 4.62x10 (elevado a -2)
Newtons. Second, measure the perimeter of the cylinder (272mm) and its height (10 cm).
Third, weight the cylindrical object inside of the unknown solution: 3.83x10 (elevado a -2)
Newtons. What was the density of the unknown solution? If the object is place in this solution,
will it sink or float?
EJERCICIO 3. (Parte examen teoría)
A solution is prepared solving 10 mg of sugar in 40g of water. The final volume is 40 ml. What
is the density of the solution? What is the concentration expressed in weight percent?
EJERCICIO 4. (Parte examen teoría)
What happen when the light interacts with the matter? Please describe all the phenomena and
provide some examples.
EJERCICIO 5. (Parte seminario)
How many grams of NaOH are needed to prepare soap from 200g of olive oil? (Saponification
index 0.134)
EJERCICIO 6. (Parte seminario)
Peso objeto en el aire W1: 0.82N
Peso objeto en el agua Ww: 0.1N
Peso objeto en el líquido: 0.06N
Averigua cual es la densidad del líquido desconocido.

EJERCICIO 7. (Parte seminario)

Aprenderse la teoría y las medidas. Puede ser que nos ponga el (SCRAW GAUGE)- buscar en los
apuntes.

EJERCICIO 8. (Instrumentos de laboratorio) (Parte seminario)

FUNNEL

TERMOMETER
 GAS CYLINDER

LABORATORY
GLASSES

BULB

STAINER/SIEVE

PIPETTE

LAB SUPPORT

TILT
 TEST TUBE

TIMER

EJERCICIO 9. (Parte seminario)

Calcular la capacidad pulmonar y El diámetro del pulgar.
Lung capacity and The diameter of the thumb.
EJERCICIO 10. (Parte de seminario)??
Problema de Heat Transfer.

EJERCICIO 11. (Parte examen teoría)

Conceptual map about the general and specific properties of matter and (the states).