Explain why an atom has no overall charge
Atoms are made up of three different types of particle. Protons and neutrons exist in the nucleus, while electrons orbit.
The relative charges of these particles mean that protons are positive while electrons are negative. Since in an atom there are the same number of protons and electrons, the charges balance out. Neutrons are neutrally charged so have no effect on the overall charge.
SK
Related Chemistry GCSE answers
All answers ▸25 cm3 of NaOH was titrated with 0.050 mol dm-3 HCl. NaOH + HCl --> NaCl + H2O. 21.5 cm3 HCl neutralised 25 cm3 NaOH. Concentration of NaOH in mol dm-3?
Explain the trends in electronegativity in the periodic table
Describe the trend in reactivity down group 1 of the periodic table.
The student did another experiment using 20 cm3 of sodium hydroxide solution with a concentration of 0.18 mol/dm3 . Relative formula mass (Mr) of NaOH = 40 Calculate the mass of sodium hydroxide in 20 cm3 of this solution.