Chemistry

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Select the correct word to complete the sentence.

Flores Alejandre Alison Karyna

Mexico

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Chemistry

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Chemistry


Compléter ChemistryVersion en ligne Select the correct word to complete the sentence. par Flores Alejandre Alison Karyna 1 help keep the nucleus stable . 2 The is very small but very heavy . 3 When an atom loses an electron , it becomes an . 4 Water forms through bonds . 5 are used in wires because of their conductivity . 6 Oxygen is a essential for respiration . 7 Water changes its when heated . 8 Oil floats on water because of differences . 9 is transferred during chemical reactions . 10 react with metals to produce gas . 11 transport nutrients and oxygen . 12 Chemical signals guide development . 13 A explanation must be logical . 14 allows controlled observations . 15 move faster in conductive materials . 16 Each has a specific energy level . 17 Physical can change with temperature . 18 The atomic number depends on the number of 19 Matter is made of tiny . 20 is essential for life on Eart h 21 can form four chemical bonds . 22 Electrons have a negative . 23 Opposite charges experience . 24 Atoms join together through chemical . 25 The of DNA determines its function . 26 does not react with other elements . 27 are atoms of the same element with different masses . 28 The equals protons plus neutrons . 29 A occurs when substances change into new substances .