760246
Descripción
Test por Hollieee01, actualizado hace más de 1 año
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Creado por Hollieee01
hace más de 10 años
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Pregunta 1
Pregunta
What atoms do covalent bonds occur between?
Respuesta
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Non-metal atoms
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Metal atoms
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Metal and non-metal atoms
Pregunta 2
Pregunta
A single covalent bond is formed when two atoms share one pair of electrons
Respuesta
- True
- False
Pregunta 3
Pregunta
How many electrons are shared when a double bond is formed?
Respuesta
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2 electrons
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Two pairs
-
1 pair
-
12 electrons
Pregunta 4
Pregunta
What is each atom aiming to do when sharing it's electrons?
Respuesta
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Get a full outer shell
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Lose all of its neutrons
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Give away all of it's electrons to other elements
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Share with all it's friends to make the world a happier place
Pregunta 5
Pregunta
What are the properties of a simple covalent molecule? (2)
Respuesta
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Weak forces between the molecules
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Strong covalent bonds between atoms
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Weak covalent bonds between atoms
-
Strong forces between the molecules
Pregunta 6
Pregunta
Simple covalent molecules have high melting and boiling points and can conduct electricity
Respuesta
- True
- False
Pregunta 7
Pregunta
What makes the giant molecule different to a simple molecule?
Respuesta
-
Many of the atoms in a giant molecule are joined together covalently throughout the whole giant molecule structure
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There are more electrons in the atoms of the giant molecules which makes them negatively charged and able to conduct electricity
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Giant molecules have high boiling and melting points, simple molecules have low ones
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A simple molecule is made by breaking the atoms apart, a giant molecule is made by connecting atoms together manually
Pregunta 8
Pregunta
Graphite is used to make
Respuesta
-
Cars and airplanes
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Electrodes and lubricants
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Roofs of houses and flooring
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Soles of shoes and hair clips
Pregunta 9
Pregunta
Does graphite have weak forces of attraction between its layers or strong?
Respuesta
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Strong?
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Weak?
Pregunta 10
Pregunta
What methods can you use to test different compounds?
Respuesta
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Melting them using a bunsen burner
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Placing electrodes into a sample of the substance to see if it conducts electricity as a solid, liquid or aqueous solution
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Timing how long it takes the substance to dissolve in water
Pregunta 11
Pregunta
What is the definition of immiscible?
Respuesta
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When two liquids are mixed together and form distinct separate layers
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When liquids are mixed together and stay mixed together
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When liquids turn to carbon dioxide when placed together
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When liquids turn to a gas when they have been placed in a freezer
Pregunta 12
Pregunta
Miscible is when liquids are mixed together and they stay mixed together
Respuesta
- True
- False
Pregunta 13
Pregunta
How would you separate miscible liquids?
Respuesta
-
By using distillation or fractional distillation
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By shaking them around
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By using a separating tunnel
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By placing them in a water bath
Pregunta 14
Pregunta
Once oxygen has been separated from liquid air by fractional distillation what can we use it for?
Respuesta
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Steel-making
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To help young children breath better
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To help freeze food quickly
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To put back into the air
Pregunta 15
Pregunta
What is chromatography used for?
Respuesta
-
To separate dissolved dyes used in food colourings
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To check foods for additives, contaminants and other substances
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To separate traces of chemicals in fires
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To identify drugs
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To test our blood pressure
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To test for animal faeces
Pregunta 16
Pregunta
How do we work out the Rf value of a substance?
Respuesta
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Distance moved by soluble substance / Distance moved by solvent
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Distance moved by solvent / Distance moved by soluble substance
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Distance moved by soluble substance x Distance moved by solvent
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Distance moved by soluble substance + Distance moved by solvent
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