Fichas
Chemistry C5 GCSE (OCR)
Fichas del conjunto (17)
- 1What does dry air consist of? Elements? Compounds?Elements: Oxygen, Nitrogen, Argon
Compounds: Carbon Dioxide - 2How much of each gas is in the atmosphere?Nitrogen: 78%
Oxygen: 21%
Argon: 1%
Carbon Dioxide: 0.04% - 3What are the symbols for the main gases which make up the air?N2 = Nitrogen
O2 = Oxygen
Ar = Argon
CO2 = Carbon Dioxide - 4Most non-metals and most compounds between non-metals are m_______.Molecular
- 5Molecular elements and elements with small molecules have ______ melting and boiling points.Low
- 6What form do molecular elements take at room temperature? Why?Gas
They consist of small molecules with weak forces of attraction between the molecules. - 7Do pure molecular compounds conduct electricity? Why?No
Their molecules are not charged. - 8What is covalent bonding? How does it arise?Bonding within molecules.
Electrostatic attraction between the nuclei of the atoms and the electrons shared between them. - 9Are covalent bonds strong?Yes
- 10What does the hydrosphere consist of?Mainly water, with some dissolved compounds (salts).
- 11How are the ions in crystals of a solid ionic compound arranged?A regular way, forming a lattice.
- 12What is ionic bonding?The forces of attraction between oppositely charged ions, which hold together ions in a crystal.
- 13What happens to the ions when an ionic crystal dissolves in water?They separate and can move around freely.
- 14Why do ionic compounds conduct electricity when dissolved in water?Because the ions are charged and they are able to move around independently in the solution.
- 15How can ions in ionic compounds be detected?They have distinct properties and they form compounds with distinct properties.
- 16Some metal ions can be identified in solution by adding a______ because they form i______ h_______ with characteristic colours.Alkali
Insoluble Hydroxides - 17Some n_______ i_____ can be identified in solution by adding a r_____ that reacts with ions to form an i_______ s_____.Negative Ions
Reagent
Insoluble Solution
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- Descripción
- GCSE Chemistry Fichas sobre Chemistry C5 GCSE (OCR), creado por Usman Rauf el 16/04/2015.
- Creado por
- Usman Rauf
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- Creado por Josh Price · 16 abr 2015
- Copiado por Usman Rauf · 16 abr 2015
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