The periodic table and chemical formulas

5.1. The symbols of chemical elements Each one of the 118 known chemical elements has a name and is represented by a chemical symbol. These symbols consist of one or two letters (the first a capital…

Observe. The periodic table and chemical formulas

Look at the photos and answer the questions: Look at figures 1-3. Say which elements are present in each compound and how many atoms there are of each. Which of these compounds is used as fuel?

Think about it. Waves

Remember what you have studied in this section and answer the questions: With a classmate, make a list of other objects that oscillate like a pendulum. Compare your list with the class. What is the…

Final Autoevaluation T12 03 - Waves. Light and sound

Answer these questions: What is sound? What are the characteristics of sound? At what speed does sound travel through the air?

Choose. A stratified society

Match the following definitions with the correct society or social group: Society of the Ancien Régime in which social position was established by birth. New social system adopted during the industrial…

Analyse. 1860 census in Spain

Look at the graph and answer the questions: Ask questions about the graph. → What profession did most people have? Were there more... or...? What does this graph tell us about Spanish industry?

Before you start - Crisis of the democracies and the Second World War (1...

Didactic objectives State the factors that transformed the United States into the first world power and describe the ‘American way of life’. Analyse the causes that led to the stock market crash of…

Writing bank

Recursos TIC. Resolver ecuaciones

Con la calculadora WIRIS podemos resolver cualquier tipo de ecuaciones. Basta con escribir resolver y la ecuación dentro de un paréntesis. Al hacer clic sobre aparece la solución: Para agilizar la…

Averigua. Triángulo equilátero

Halla la altura de un triángulo equilátero de 2 m de lado. La altura del triángulo equilátero es de m.