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Peter meets me at school everyday. Срочно задать Общий вопрос, альтернативный, с хвостиком, специальный. Быстрее прошу

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furymalice
furymalice
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1. сhemicals must be used carefully in the laboratory. 2. you should stay out of the laboratory if your teacher is not there. 3. many of the chemicals can be dangerous. 4. all chemicals must be treated with care. 5. how should you tell that a substance is pure? 6. dalton`s ideas about atom can explain many scientific laws. 7. a substance must be recognised by its properties. 8. a question that we must answer is how the atoms get electrical charge.

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