5070_w23_qp_12
A paper of Chemistry, 5070
Questions:
40
Year:
2023
Paper:
1
Variant:
2
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2
A crystal of sodium chloride is dropped into a beaker of water and the crystal dissolves. There are four stages in this process. The water molecules collide with the ions in the crystal lattice. The ionic bonds in the crystal break. The ions move randomly in all directions until they are evenly spread throughout the solution. The ions continue to move randomly in all directions but remain evenly spread throughout the solution. At which stages is diffusion occurring?
7. Acids, bases and salts  →  7.3. Preparation of salts
1. States of matter  →  1.2. Diffusion
Open
16
Two methods used by students to measure the rate of a reaction are the ‘disappearing cross’ method and the ‘loss of mass’ method. ● For the ‘disappearing cross’ method, the student measures the time taken for the reaction mixture to go cloudy. ● For the ‘loss of mass’ method, the student measures the loss of mass over a known time interval. The rates of two reactions are investigated. reaction 1 Warm aqueous silver nitrate is added to chlorobutane dissolved in ethanol. Two products are formed. One is an organic compound which is soluble in ethanol and the other is silver chloride which is insoluble in ethanol. reaction 2 Pieces of solid calcium carbonate are added to dilute hydrochloric acid. Which method should be used for each reaction?
6. Chemical reactions  →  6.2. Rate of reaction
Open