Test
AQA GCSE Chemistry Unit 2.3
Preguntas del test (20)
1What is the mass number of an element?
- ANumber of protons
- BNumber of protons and neutrons
- CNumber of protons, neutrons and electrons
2True or false? Isotopes of the same element have the same physical properties but different chemical properties.
- AVerdadero
- BFalso
3Which isotope of hydrogen has 1 neutron?
- AProtium
- BDeuterium
- CTritium
4What is the relative formula mass of a compound?
- AThe sum of the atomic masses of each element relative to C-12
- BThe mass of the compound which it has decayed from
- CThe mass of the compound in micrograms
5True or false? A mole of a substance is the amount that contains Avogadro's constant number of particles - this can be simplified to the relative formula mass in grams.
- AVerdadero
- BFalso
6What percentage of magnesium oxide is magnesium? (RAM of Mg = 24, RAM of O = 16, magnesium oxide = MgO)
- A50%
- B55%
- C60%
- D65%
7True or false? The empirical formula of a substance is the simplest ratio of the elements within it.
- AVerdadero
- BFalso
8What is the empirical formula of the hydrocarbon containing 75% carbon? (RAM of C = 12, RAM of H = 1)
- AC2H3
- BCH2
- CCH3
- DCH4
9What can we learn from the balanced symbol equation?
- ANumber of molecules involved in each side of the reaction
- BNumber of moles involved in each side of the reaction
- CThe rate of the reaction
- DHow much energy is required to carry out the reaction
10Given that H2 + Cl2 --> 2HCl, what mass of HCl would you expect to produce with 17.75g of Cl2? (RAM of H = 1, RAM of Cl = 35.5)
- A17.75g
- B36.5g
- C73g
11True or false? The formula to work out percentage yield is theoretical yield/actual yield * 100.
- AVerdadero
- BFalso
12Given that CaCO3 --> CaO + CO2, what is the percentage yield of CaO if 100g of CaCO3 were used and 39g of CaO were collected? (RAM of Ca = 40, RAM of C = 12, RAM of O = 16)
- A50%
- B60%
- C70%
- D80%
13Why is the percentage yield of a reaction rarely 100%?
- AThe reaction may be reversible
- BSome of the product may not be collected
- CThe reaction may be incomplete
- DThe product may have been hidden
14What is a reversible reaction?
- AOne in which the reaction is always incomplete
- BOne in which the products may react to produce reactants
- COne in which the products disintegrate upon production
15Assuming that the reaction is reversible, what is the scientific notation for the reaction between ammonia and hydrogen chloride to form ammonium chloride?
- ANH3 + HCl --> NH4Cl
- BNH3 + HCl <--> NH4Cl
- CNH3 + HCl --> NH4Cl --> NH3 + HCl
16True or false? One key application of chemical analysis is detection of illegal food additives such as tartrazine.
- AVerdadero
- BFalso
17Which of these analytical methods does not rely on machinery?
- AMass spectrometry
- BGas chromatography
- CPaper chromatography
18Which of these are advantages of using instrumental methods of analysis?
- AMore expensive
- BVery accurate and sensitive
- CQuicker
- DRequires training to use
- ECan be used with small samples
- FIs only useful with known data to compare it to
19What is measured to identify compounds in GC-MS?
- AMolecular ion peak
- BRetention time
20What separates out compounds in a mixture in GC-MS?
- AMolecular ion peak
- BRetention time
Información
- Descripción
- Twenty questions on the third section of Unit 2 in AQA GCSE Chemistry: How much?
- Autor
- Matthew T
- Idioma
- English
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