Chemical and physical changes can be distinguished based on whether changes occur at the molecular level or involve energy and states of matter. Physical changes alter the shape or state of matter of a substance without changing its chemical composition, such as crushing a can or melting ice. Chemical changes involve transformations of molecular structure and composition through breaking and forming of chemical bonds, such as rusting of iron or burning of sugar. While some changes are obvious, others occur at the microscopic level of molecular structure and bonding.
Chemical and physical changes can be distinguished based on whether changes occur at the molecular level or involve energy and states of matter. Physical changes alter the shape or state of matter of a substance without changing its chemical composition, such as crushing a can or melting ice. Chemical changes involve transformations of molecular structure and composition through breaking and forming of chemical bonds, such as rusting of iron or burning of sugar. While some changes are obvious, others occur at the microscopic level of molecular structure and bonding.
La atmósfera terrestre se divide en cinco capas principales ordenadas por altura: la troposfera, la estratosfera, la mesosfera, la termosfera y la exosfera. Cada capa se caracteriza por cómo cambia la temperatura con la altura y por la composición química del aire.
La atmósfera terrestre se divide en cinco capas principales ordenadas por altura: la troposfera, la estratosfera, la mesosfera, la termosfera y la exosfera. Cada capa se caracteriza por cómo cambia la temperatura con la altura y por la composición química del aire.
This document outlines the teaching procedures and timeline for a secondary mathematics lesson. It includes sections for starting the lesson with a warm-up activity, presenting the main lesson procedures over multiple steps, closing the lesson, an extension activity, and final assessment. The document leaves blanks to be filled in with specifics of the topic, duration, strategies, resources and time allotted for each part of the lesson.
The document provides vocabulary words and guidance for planning and conducting science experiments using the scientific method, including defining the problem, forming a hypothesis, designing an experiment with controls and variables, collecting and analyzing data, discussing results, and evaluating errors. It also provides examples of experiments conducted by students on basketball shooting technique, food preferences for a class party, and stain removal methods.
1. Classroom English should be used to maintain an English-speaking atmosphere and encourage learners to think in English rather than translating everything.
2. Teachers should aim to use English for simple instructions and questions, while occasionally translating more complex ideas. Too much English too quickly can reduce confidence, while too much translation creates passive learners.
3. The document provides examples of classroom English for various classroom activities like instructions, group work, board work, using materials, games and songs, classroom management and feedback.
The document provides vocabulary words and steps for planning and conducting science experiments using the scientific method, including defining a problem, forming a hypothesis, designing an experiment with controls and variables, collecting and analyzing data, discussing results, and evaluating and improving the experiment. Examples are given of experiments conducted on basketball shooting technique, food preferences for a class party, and dog food preferences.