Decide which of the following properties are magnitudes:
Height Beauty Mass
Time Happiness Temperature
Height, mass, time and temperature are magnitudes.
100
Is this number in scientific notation? Justify your answer.
45·10 6
This number is not in scientific notation because 45 is bigger than 10.
100
Decide which of the following letters stand for a multiple and which of them stand for a submultiple:
m c k h da d
- Multiples: k, h, da
- Submultiples: m, c, d
100
¿Cuál es la primera etapa del método científico?
La identificación o planteamiento del problema.
200
Give an example of a chemical change.
Open answer.
200
Identify the magnitude and the unit in the following example:
The height of the building is 15 m.
Magnitude: height.
Unit: metre.
200
Write this number in scientific notation:
7 000 000 000 m
7·10 9
200
Replace the following powers of ten by a multiple or submultiple:
6·10 -3 m 5·10 1 s
7·10 2 g 3·10 -2 K
4·10 3 L 2·10 -1 m
6 mm 5 das
7 hg 3 cK
4 kL 2 dm
200
¿Qué es un hipótesis?
Es una explicación provisional al problema planteado.
300
Is dissolving salt in water a physical or a chemical change? Justify your answer.
It's a physical change. If we evaporate the water we can recover the salt.
300
Identify the magnitude and the unit in the following example:
The film lasts 120 min.
Magnitude: time.
Unit: minute.
300
Transform this number from scientific notation to "normal":
6·10 4
60 000
300
Replace the following multiples and submultiples by a power of ten:
a) 67 mg b) 0.732 cm c) 90 hm
d) 0.5 dag e) 857 kg f) 63 dg
a) 67·10 -3 g b) 0.732·10 -2 m c) 90·10 2 m
d) 0.5·10 1 g e) 857·10 3 g f) 63·10 -1 g
300
a) ¿Cómo se comprueba si una hipótesis es o no correcta?
b) ¿Qué se hace en caso de que no sea correcta?
a) Haciendo experimentos.
b) Se plantea una nueva hipótesis.
400
Decide if the following changes are physical or chemical changes:
- Breaking a glass.
- Melting iron.
- An apple falling from a tree.
- Decomposition of a piece of meat.
- Dissolving sugar in water.
- An apple rotting.
- Breaking a glass: Physical change.
- Melting iron: Physical change.
- An apple falling from a tree: Physical change.
- Decomposition of a piece of meat: Chemical change.
- Dissolving sugar in water: Physical change.
- An apple rotting: Chemical chagne.
400
Complete the following table:
FUNDAMENTAL MAGNITUDE UNIT IN THE SI
1.
2.
3.
4.
FUNDAMENTAL MAGNITUDE UNIT IN THE SI
1. Length metre (m)
2. Mass kilogram (kg)
3. Time second (s)
4. Temperature kelvin (K)
400
Write this number in scientific notation:
0.000 000 703
7.03·10 -7
400
Which of the following quantities is bigger?
a) 5 dam2 or 0.0008 km2
b) 480 s or 10 min
a) 5 dam2 < 8 dam2
b) 480 s < 600 s
400
¿Cómo se obtiene el conocimiento científico?
Se obtiene al aplicar el método científico.
500
What is the main difference between a physical and a chemical change?
Physical changes do not produce new substances while chemical changes produce new subtances.
500
What is a derived magnitude?
Give an example of a derived mangitude and explain what is the fundamental magnitude related to this derived magnitude.
A derived magnitude is a magnitude that can be related to one or mor fundamental magnitudes.
Open answer.
500
Transform this number from scientific notation to "normal":
2.69·10 -7
0.000 000 269
500
Write the following numbers in their unit of the SI. Express the result in scientific notation:
a) 809 km b) 5 g c) 327 ms d) 43 daK
a) 809 km = 809 000 m = 8.09·10 5 m
b) 5 g = 0.005 kg = 5·10 -3 kg
c) 327 ms = 0.327 s = 3.27·10 -1 s
d) 43 daK = 430 K = 4.3·10 2 K
500
¿Cuáles son las tres características más importantes del conocimiento científico?
1. Se basa en pruebas (no en creencias o intuiciones)
2. Está de acuerdo con la realidad y debe poder comprobarse.
3. Ha sido construido mediante la contribución de muchas personas a lo largo de la historia.