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Year 11 Core Science Test sobre Chemistry Quiz, creado por First Name el 27/02/2018.

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Chemistry Quiz

Pregunta 1 de 5

1

What is an ion?

Selecciona una de las siguientes respuestas posibles:

  • An ion is a atom that has gained or lost an electron

  • An ion is a substance that can displace all other substances

  • An ion is an element

  • An ion is a group of atoms that is joined with a covalent bond

Explicación

Pregunta 2 de 5

1

What is a covalent bond?

Selecciona una de las siguientes respuestas posibles:

  • A covalent bond is what an ion formes after it gains an electron

  • A covalent bond is a acadic solution

  • A covalent bond is a bond formed between two or more atoms when they share a pair of electrons

  • A covalent bond is a substance that can only be displaced

Explicación

Pregunta 3 de 5

1

What is a displacement reaction?

Selecciona una de las siguientes respuestas posibles:

  • Its when one solution take the place of another solution

  • It is when one ion takess the place of another ion in a compound

  • Its when one or more atoms are connected bt a covalent biond

  • Its when a compound gets its place taken by a molecule

Explicación

Pregunta 4 de 5

1

When X Ion can displace Z ion. But X cannot displace Yi on. What is the most reactive ion.

Selecciona una de las siguientes respuestas posibles:

  • X

  • Y

  • Z

Explicación

Pregunta 5 de 5

1

Why dose a catalyst make a reaction faster?

Selecciona una de las siguientes respuestas posibles:

  • It lowers the activation energy and this makes each collision more likely to succeed in its reaction increcing the reaction rate.

  • It highers the activation energy making the reaction temperature higher and so making the atoms move more

  • It causes the colisions happening to become less freuent and this then makes it more likly that it reacts

Explicación