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Elements of Life

Questão 1 de 14

1

Which scientist cut up a piece of material until he discovered what then was thought to be the smallest particle an atom?

Selecione uma das seguintes:

  • Dalton

  • Democritus

  • Rutherford

Explicação

Questão 2 de 14

1

Who discovered the later to be named electron?

Selecione uma das seguintes:

  • J.J Thomas

  • Dalton

  • Bohr

Explicação

Questão 3 de 14

1

What particle did Rutherford shoot at a piece of thin gold foil during his experiment to confirm that an atom is mostly empty space?

Selecione uma das seguintes:

  • Beta particle

  • Soot particle

  • Alpha particle

Explicação

Questão 4 de 14

1

What did Rutherford discover about the atom due to his experiment with firing particles at gold foil?

Selecione uma das seguintes:

  • The atom has a dense positivley charged nucleus in the center of the atom.

  • The atom has electrons which orbit the nucleus in energy levels.

  • Atoms are mostly empty space with negatively charged particles embedded.

Explicação

Questão 5 de 14

1

What of the below evidence supported Bohrs hypothesis that electrons are located at specific energy levels.

Selecione uma das seguintes:

  • Atomic Spectra

  • When compounds are formed

  • Electrolysis of compounds

Explicação

Questão 6 de 14

4

Selecione das listas do Menu para completar o texto.

( Dalton's, Bohrs, Rutherfords, Democritus ) Billiard Balls-
Conclusion- Atoms are ( solid spheres, Hollow spheres, small squares, identifiable mass ). Atoms are of the same element ( are identical, vary slightly, are different ).
Evidence- When observing the formation of ( compounds, ions, molecules ) and the atom rearrangement.

Explicação

Questão 7 de 14

7

When an electron it is to a higher energy level. However the electron is in its so in turn any lower energy level. The electron in the process in the form of .

Arraste e solte para completar o texto.

    absorbs energy
    steals energy
    light
    emits energy
    unstable
    excited position
    drops to
    excited

Explicação

Questão 8 de 14

1

Which of the following terms is the definition of relative isotopic mass?

Selecione uma das seguintes:

  • Isotopic mass is the mass of an atom compared to 1/12 of a carbon-12 atom.

  • Isotopic mass is the mass of an atom compared to a hydrogen-1 atom.

  • Isotopic mass is the mass of an atom compared to 1/16 of a oxygen-16 atom.

Explicação

Questão 9 de 14

1

Which of the followings are correct for the term isotope.

Selecione uma ou mais das seguintes:

  • Same amount of protons

  • Different number of electrons

  • Different mass number

  • Different number of neutrons

Explicação

Questão 10 de 14

1

Which of the following is the definition for relative atomic mass?

Selecione uma das seguintes:

  • The weighted average of all naturally occurring isotopes of an element.

  • The weighted average of all isotopes and possible ions of an element.

  • The weighted average of all possible ions of an element

Explicação

Questão 11 de 14

1

What machine in the chemical industry is used to identify elements in a sample?

Selecione uma das seguintes:

  • Mass spectrometer

  • Electrode

  • Calorimeter

Explicação

Questão 12 de 14

1

The peaks on a graph showing the elements found in a sample represent what?

Selecione uma das seguintes:

  • Abundance

  • Relative isotopic mass

  • Neutron number

Explicação

Questão 13 de 14

1

What shape is an 's' orbital?

Selecione uma das seguintes:

  • Sphere

  • Dumbell

  • Oval

Explicação

Questão 14 de 14

1

What shape is a 'p' orbital?

Selecione uma das seguintes:

  • Sphere

  • Dumbell

  • Oval

Explicação

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