2.3. Formulas
A subsection of Chemistry, 9701, through 2. Atoms, molecules and stoichiometry
Listing 10 of 88 questions
Separate samples of R, S, T and U are added to cold water. The identity of each sample is unknown. However, each sample is known to be pure and can only be one of Ba(OH)2, NaCl, P4O10 or SiCl 4. Use the observations in the table to identify each sample as one of Ba(OH)2, NaCl, P4O10 and SiCl 4. Write your answers in the table. state at room temperature observations on addition of sample to water identity of sample R solid alkaline, colourless solution is produced, some white solid remains S solid white solid disappears, solution is neutral T liquid misty fumes produced, white solid is made in vigorous reaction U solid acidic, colourless solution produced in vigorous reaction  Identify the formula of the white solid made when sampleT reacts with water. Name the solution formed when sampleU reacts with water. Magnesiumoxide and aluminiumoxide have properties typical of ceramic materials. Name one physical property typical of ceramic materials. Give the formula of another Period3 oxide which behaves as a ceramic material. Tungsten oxide, WxOy, is used to give colour to ceramic materials. A sample of WxOy contains 79.29% tungsten by mass. Calculate the empirical formula of WxOy. Show your working.  empirical formula =  
9701_s21_qp_23
THEORY
2021
Paper 2, Variant 3
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