Chemistry Quiz 1 (Year 9)

Chemistry Quiz 1 (Year 9)

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1) By 1932, scientists had developed a new model. The model explains

. It also explains chemical reactions.

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2)

and neutrons make up the nucleus.

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3) The charge for proton is

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4)

of the mass of an atom is in its nucleus

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5) Thomson collected evidence to test his idea. He passed cathode rays between electrically charged pieces of metal. The rays bent towards the

charged metal.

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6) Thomson knew that electrons are negatively charged. He also knew that atoms have

electrical charge.

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7) Thomson suggested a new atomic model, Thomson's plum pudding model. ................................. are placed throughout a .....................-charged sphere. The electrons move around in rings.

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8) Nagaoka suggested a new model, Nagaoka's Saturn model. An atom consists of a ....................... charged centre. Electrons orbit around the .............. in rings, like those of the planet Saturn.

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9) By 1911, Rutherford had created a new model:

Atoms have a .................... nucleus. Most of the mass of an atom is in its nucleus. The nucleus is ...................... charged.

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10) Rutherford's model explained Geiger and Marsden's observations:

The positive particles that

had hit a nucleus.

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11) Niels Bohr wondered how electrons move in the empty space around a nucleus. He suggested an explanation. Electrons move in

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12) By 1932, James Chadwick had an answer. His experiments showed that nuclei contain ......................... as well as .........................

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13) All atoms of a element have the same number of

.

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14) In the modern periodic table, the elements are arranged in order of their number of

.

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15) Each shell can hold a maximum number of electrons:

• the first shell can hold up to ..................... electrons

• the second shell can hold up to ........................ electrons.

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16) Given that the proton number for Oxygen is 8. Write the electronic structure of Oxygen.

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17) In all groups, atoms of each element have the same number of electrons in their

shell.

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18) Particles in the nucleus, protons and neutrons are called

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19) The nucleon number of an atom is also called its

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20) Fluorine has 9 protons and 10 neutrons. What is its Nucleon number?

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21) Atoms of the same element that have different numbers of neutrons are called

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22) A gradual change in a property is called a

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23) Universal Indicator solution becomes

in the solution where metal from Group 1 reacts with water.

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24) potassium + water ➔

+ hydrogen

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25. Going down the group, from lithium to rubidium, melting point