FIRST TERM UNIT 0: SCIENTIFIC KNOWLEDGE U.0_3: Physical quantities. Física y química 3º E.S.O. FIRST TERM UNIT 0: SCIENTIFIC KNOWLEDGE U.0_3: Physical quantities. U.0_3_2: Physical quantities. Scientific notation. U.0_3_2 d1

Bloque 1. La actividad científica. El método científico: sus etapas. Medida de magnitudes. Sistema Internacional de Unidades. Notación científica. Utilización de las Tecnologías de la Información y la Comunicación. El trabajo en el laboratorio. Proyecto de investigación. Criterios de evaluación C.E.1.1. Reconocer e identificar las características del método científico. CMCT E.A.1.1.1. Formula hipótesis para explicar fenómenos cotidianos utilizando teorías y modelos científicos. E.A.1.1.2. Registra observaciones, datos y resultados de manera organizada y rigurosa, y los comunica de forma oral y escrita utilizando esquemas, gráficos, tablas y expresiones matemáticas. C.E.1.2. Valorar la investigación científica y su impacto en la industria y en el desarrollo de la sociedad. CCL, CSC E.A.1.2.1.Relaciona la investigación científica con las aplicaciones tecnológicas en la vida cotidiana. C.E.1.3. Conocer los procedimientos científicos para determinar magnitudes. CMCT E.A.1.3.1. Establece relaciones entre magnitudes y unidades utilizando, preferentemente, el Sistema Internacional de Unidades y la notación científica para expresar los resultados. C.E.1.4. Reconocer los materiales e instrumentos básicos presentes en los laboratorios de Física y Química; conocer y respetar las normas de seguridad y de eliminación de residuos para la protección del medio ambiente.CCL, CMCT. CAA, CSC. E.A.1.4.1. Reconoce e identifica los símbolos más frecuentes utilizados en el etiquetado de productos químicos e instalaciones, interpretando su significado. E.A.1.4.2. Identifica material e instrumentos básicos de laboratorio y conoce su forma de utilización para la realización de experiencias respetando las normas de seguridad e identificando actitudes y medidas de actuación preventivas. C.E.1.5. Interpretar la información sobre temas científicos de carácter divulgativo que aparece en publicaciones y medios de comunicación. CCL, CSC E.A.1.5.1. Selecciona, comprende e interpreta información relevante en un texto de divulgación científica y transmite las conclusiones obtenidas utilizando el lenguaje oral y escrito con propiedad. E.A.1.5.2. Identifica las principales características ligadas a la fiabilidad y objetividad del flujo de información existente en internet y otros medios digitales. C.E.1.6. Desarrollar y defender pequeños trabajos de investigación en los que se ponga en práctica la aplicación del método científico y la utilización de las TIC.CCL, CMCT, CD, SIEP E.A.1.6.1. Realiza pequeños trabajos de investigación sobre algún tema objeto de estudio aplicando el método científico, y utilizando las TIC para la búsqueda y selección de información y presentación de conclusiones. E.A.1.6.2. Participa, valora, gestiona y respeta el trabajo individual y en equipo. U.0_3_2 d2

Scientific notation Scientific notation is a way of expressing numbers that are too big or too small to be conveniently written in decimal form. It is commonly used by scientists, mathematicians and engineers, in part because it can simplify certain arithmetic operations U.0_3_2 d3

The Milky Way Galaxy contains Scientific notation The Milky Way Galaxy contains 3 000 000 000 000 000 000 000 000 000 000 000 000 000 tons of matter Using an exponent to represent a number allows that number to grow very big very fast. Scientific notation makes the number much more compact and readable: 3 × 1039 tons. U.0_3_2 d4

A number written in scientific notation has two parts : - The first is a number between 1 and 9 - The second is a power of ten, with a base (10) and an exponent Like this: Or this: U.0_3_2 d5

Why is 700 written as 7 × 102 in Scientific Notation? How does it work? Why is 700 written as 7 × 102 in Scientific Notation? 700 = 7 × 100 and 100 = 102 (see powers of 10) so 700 = 7 × 102 U.0_3_2 d6

Why is 4,900,000,000 written as 4.9 × 109 in Scientific Notation? How does it work? Why is 4,900,000,000 written as 4.9 × 109 in Scientific Notation? 4,900,000,000 = 4.9 × 1,000,000,000 and 1,000,000,000 = 109 (see powers of 10) U.0_3_2 d7

Why is 5326.6 written as 5.3266 × 103 in Scientific Notation? How does it work? Why is 5326.6 written as 5.3266 × 103 in Scientific Notation? Because 5326.6 = 5.3266 × 1000 = 5.3266 × 103 U.0_3_2 d8

How does it work when the number is smaller than 1? Scientific notation How does it work when the number is smaller than 1? Example: 0.0055 is written 5.5 × 10-3 The power of 10 is negative because 0.0055 = 5.5 × 0.001 = 5.5 × 10-3 0.001 = 10-3 (see powers of 10) U.0_3_2 d9

How does it work when the number is smaller than 1? Scientific notation How does it work when the number is smaller than 1? Example: 0.0000000013 is written 1.3 × 10-9 The power of 10 is negative because 0.0000000013 = 1.3 × 0.000000001 = 1.3 × 10-9 0.000000001 = 10-9 (see powers of 10) U.0_3_2 d10

To figure out the power of 10, think Scientific notation To figure out the power of 10, think "how many places do I move the decimal point?" When writing numbers greater than ten in scientific notation, the exponent is positive and equals the number of places that the original decimal point has been moved to the left. U.0_3_2 d11

To figure out the power of 10, think Scientific notation To figure out the power of 10, think "how many places do I move the decimal point?" When writing numbers greater than ten in scientific notation, the exponent is positive and equals the number of places that the original decimal point has been moved to the left. U.0_3_2 d12

To figure out the power of 10, think Scientific notation To figure out the power of 10, think "how many places do I move the decimal point?" When writing numbers greater than ten in scientific notation, the exponent is positive and equals the number of places that the original decimal point has been moved to the left. 6,300,000 = 6.3 x 106 94,700 = 9.47 x 10 4 U.0_3_2 d13

To figure out the power of 10, think Scientific notation To figure out the power of 10, think "how many places do I move the decimal point?" Numbers less than one have a negative exponent when written in scientific notation. The value of the exponent equals the number of places the decimal has been moved to the right. U.0_3_2 d14

To figure out the power of 10, think Scientific notation To figure out the power of 10, think "how many places do I move the decimal point?" Numbers less than one have a negative exponent when written in scientific notation. The value of the exponent equals the number of places the decimal has been moved to the right. 0.000 008 = 8 x 10 –6 0.00736 = 7.36 x 10 –3 U.0_3_2 d15

To figure out the power of 10, think Scientific notation To figure out the power of 10, think "how many places do I move the decimal point?" 7,500,000,000 is written as 7.5x109 0.00000000005 is written as 5x10-11 U.0_3_2 d16

To figure out the power of 10, think Scientific notation To figure out the power of 10, think "how many places do I move the decimal point?" U.0_3_2 d17

Convert scientific notation into decimal The value of the exponent equals the number of places the decimal point has been moved For positive exponents move the decimal point to the right. For negative exponents move the decimal point to the left. U.0_3_2 d18

Convert scientific notation into decimal The value of the exponent equals the number of places the decimal point has been moved For positive exponents move the decimal point to the right. For negative exponents move the decimal point to the left. U.0_3_2 d19

• Write on your notebook the results of 40 exercises. Mind you Scientific notation Exercices online: http://askthenerd.com/SciNotation.html • Write on your notebook the results of 40 exercises. Mind you can check your answers online. U.0_3_2 d20