El signo

La lengua en la sociedad

End-of-unit activities - Animal reproduction

Reproduction is the only vital function that is not needed to keep an individual alive. It ensures the continuation of the species. Although sexual reproduction is a universal characteristic of animals,…

Match. The basic function of living things

Indicate which basic function of living things is reflected in each of these cases: A wolf sniffs the trail of a boar. A cheetah eats a gazelle. A rabbit hears a noise and hides in the grass. Two big…

Write. Names and formulas (1)

Write the formula for each of these compounds: Nitrogen tribromide Sulphur dioxide Carbon tetrafluoride Lithium bromide

Calculate. Matter and its properties (1)

84 g of nitrogen reacts with hydrogen to form 102 g of ammonia. Calculate the mass of the hydrogen required for the reaction. g of hydrogen.

Final Autoevaluation T12 08 - Waves. Light and sound

Match the item to its characteristic of sound: 60 decibels   →    High pitched   →    A very loud sound   →    Piano   →    120 decibels   →    Bass…

Final Autoevaluation T12 10 - Waves. Light and sound

Indicate (Yes or No) for the characteristics of the shadow produced by a point light source: It has sharp edges   →    Two different areas of shadow are formed   →    Does it have the…

Initial evaluation T3 03 - The industrialisation of European societies

Complete this table with the characteristics of the two social classes of the capitalist system.

Introducción - Un proyecto ético: los derechos humanos

Introducción Un proyecto ético: los derechos humanos