Chemistry unit 1 0.0 / 5 ? ChemistryEverythingGCSEAQA Created by: aleenar144Created on: 05-04-16 18:23 What is the atomic number equal to? The number of protons. 1 of 11 What is the mass number equal to? The number of protons and neutrons. 2 of 11 What is electronic structure? The number of electrons on each energy level or shell. 3 of 11 Why do atoms not have an overall charge? The positive protons balance out the negative electrons. 4 of 11 What is ionic bonding? When a metal and a non-metal react. The metal is positively charged and gives electronsand the non-metal is negatively charged and takes electrons. 5 of 11 What is covalent bonding? Wwhen a non-metal and a non-metal react. They share electrons. 6 of 11 What is limestone? Calcium carbonate (CaCO3). 7 of 11 How did limestone form? Carbon dioxide was absorbed and dissolved into oceans and locked into sedimentary rock. 8 of 11 How is cement made? Powdered limestone + powdered clay (using heat) 9 of 11 How is concrete made? Cement powder + sand + crushed rock + water. 10 of 11 What is limestone used for? 1. Building material 11 of 11
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