Hollieee01
Test por , creado hace más de 1 año

GCSE Chemistry Test sobre Additional Chemistry - Topic 3: Covalent Compounds and Separation Techniques, creado por Hollieee01 el 15/04/2014.

156
1
0
Hollieee01
Creado por Hollieee01 hace más de 10 años
Cerrar

Additional Chemistry - Topic 3: Covalent Compounds and Separation Techniques

Pregunta 1 de 16

1

What atoms do covalent bonds occur between?

Selecciona una de las siguientes respuestas posibles:

  • Non-metal atoms

  • Metal atoms

  • Metal and non-metal atoms

Explicación

Pregunta 2 de 16

1

A single covalent bond is formed when two atoms share one pair of electrons

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 3 de 16

1

How many electrons are shared when a double bond is formed?

Selecciona una de las siguientes respuestas posibles:

  • 2 electrons

  • Two pairs

  • 1 pair

  • 12 electrons

Explicación

Pregunta 4 de 16

1

What is each atom aiming to do when sharing it's electrons?

Selecciona una de las siguientes respuestas posibles:

  • Get a full outer shell

  • Lose all of its neutrons

  • Give away all of it's electrons to other elements

  • Share with all it's friends to make the world a happier place

Explicación

Pregunta 5 de 16

1

What are the properties of a simple covalent molecule? (2)

Selecciona una o más de las siguientes respuestas posibles:

  • Weak forces between the molecules

  • Strong covalent bonds between atoms

  • Weak covalent bonds between atoms

  • Strong forces between the molecules

Explicación

Pregunta 6 de 16

1

Simple covalent molecules have high melting and boiling points and can conduct electricity

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 7 de 16

1

What makes the giant molecule different to a simple molecule?

Selecciona una o más de las siguientes respuestas posibles:

  • Many of the atoms in a giant molecule are joined together covalently throughout the whole giant molecule structure

  • There are more electrons in the atoms of the giant molecules which makes them negatively charged and able to conduct electricity

  • Giant molecules have high boiling and melting points, simple molecules have low ones

  • A simple molecule is made by breaking the atoms apart, a giant molecule is made by connecting atoms together manually

Explicación

Pregunta 8 de 16

1

Graphite is used to make

Selecciona una de las siguientes respuestas posibles:

  • Cars and airplanes

  • Electrodes and lubricants

  • Roofs of houses and flooring

  • Soles of shoes and hair clips

Explicación

Pregunta 9 de 16

1

Does graphite have weak forces of attraction between its layers or strong?

Selecciona una de las siguientes respuestas posibles:

  • Strong?

  • Weak?

Explicación

Pregunta 10 de 16

1

What methods can you use to test different compounds?

Selecciona una o más de las siguientes respuestas posibles:

  • Melting them using a bunsen burner

  • Placing electrodes into a sample of the substance to see if it conducts electricity as a solid, liquid or aqueous solution

  • Timing how long it takes the substance to dissolve in water

Explicación

Pregunta 11 de 16

1

What is the definition of immiscible?

Selecciona una de las siguientes respuestas posibles:

  • When two liquids are mixed together and form distinct separate layers

  • When liquids are mixed together and stay mixed together

  • When liquids turn to carbon dioxide when placed together

  • When liquids turn to a gas when they have been placed in a freezer

Explicación

Pregunta 12 de 16

1

Miscible is when liquids are mixed together and they stay mixed together

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 13 de 16

1

How would you separate miscible liquids?

Selecciona una de las siguientes respuestas posibles:

  • By using distillation or fractional distillation

  • By shaking them around

  • By using a separating tunnel

  • By placing them in a water bath

Explicación

Pregunta 14 de 16

1

Once oxygen has been separated from liquid air by fractional distillation what can we use it for?

Selecciona una de las siguientes respuestas posibles:

  • Steel-making

  • To help young children breath better

  • To help freeze food quickly

  • To put back into the air

Explicación

Pregunta 15 de 16

1

What is chromatography used for?

Selecciona una o más de las siguientes respuestas posibles:

  • To separate dissolved dyes used in food colourings

  • To check foods for additives, contaminants and other substances

  • To separate traces of chemicals in fires

  • To identify drugs

  • To test our blood pressure

  • To test for animal faeces

Explicación

Pregunta 16 de 16

1

How do we work out the Rf value of a substance?

Selecciona una de las siguientes respuestas posibles:

  • Distance moved by soluble substance / Distance moved by solvent

  • Distance moved by solvent / Distance moved by soluble substance

  • Distance moved by soluble substance x Distance moved by solvent

  • Distance moved by soluble substance + Distance moved by solvent

Explicación

Anterior
Siguiente