SCIENCE 8 - REVIEW

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Quick review on atoms, models, and compounds.

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Christ Ann Jean Jayson

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SCIENCE 8 - REVIEW


SCIENCE 8 - REVIEWVersión en línea Quick review on atoms, models, and compounds. por Christ Ann Jean Jayson 1 Which scientist's experiment led to the discovery of the nucleus? a Hydrogen Emission Spectrum Experiment b Gold Foil Experiment c Cathode Ray Tube Experiment d Oil Drop Experiment 2 Whose idea is a solar-system-like atom model with electrons orbiting the nucleus? a James Chadwick b Democritus c Ernest Rutherford d Niels Bohr 3 Dalton's idea of indivisible particles is best remembered as being a atoms emit radiation naturally b atoms are mostly empty space c atoms contain subatomic particles d atoms are solid spheres that combine in fixed ratios 4 Who improved Thomson's plum pudding model by showing electrons move around a dense nucleus? a Ernest Rutherford b James Chadwick c Niels Bohr d John Dalton 5 Which scientist is correctly matched with his contribution? a James Chadwick – discovered the electron b J.J. Thomson – discovered the neutron c Ernest Rutherford – discovered the nucleus d Niels Bohr – discovered the proton 6 If an atom loses one electron, what is its charge? a It has gained neutrons b It has equal numbers of protons and electrons c It now has more protons than electrons d It now has more electrons than protons 7 Two atoms of the same element with different numbers of neutrons are a isotopes of the same element b different elements c ions of the same element d identical atomic mass 8 Heating sugar to brown and release water vapor and carbon shows a Sugar is a mixture because it separates easily b Sugar is a mixture because it contains water and carbon c Sugar is a compound because it breaks down into simpler substances d Sugar is an element because it produces carbon 9 When salt is dissolved in water, evaporation shows a The substances form a new pure compound b The substances are chemically combined c The substances retain their original properties d The substances have changed into new elements 10 Which experiment led to the discovery of the nucleus in atoms? a Gold Foil Experiment b Oil Drop Experiment c Cathode Ray Tube Experiment d Hydrogen Emission Spectrum Experiment 11 Whose model resembles a solar system with electrons orbiting the nucleus? a Ernest Rutherford b Niels Bohr c John Dalton d J.J. Thomson 12 Dalton’s theory posits atoms are indivisible; which part is remembered? a Atoms contain subatomic particles b Atoms combine in fixed ratios c Atoms are mostly empty space d Atoms emit radiation 13 Which scientist improved Thomson’s model by proving electrons orbit a dense nucleus? a Ernest Rutherford b James Chadwick c Niels Bohr d John Dalton 14 Which pairing is correctly matched to their contribution? a Ernest Rutherford – discovered the nucleus b Niels Bohr – discovered the proton c J.J. Thomson – discovered the neutron d James Chadwick – discovered the electron 15 If an atom loses one electron, it becomes: a Balanced protons and electrons b More protons than electrons c More electrons than protons d Neutral neutrons 16 Two atoms of the same element with different neutrons are called: a Ions b Allotropes c Isotopes d Molecules 17 Sugar turns brown and produces water vapor and carbon when heated; this shows: a Sugar is radioactive b Sugar is an element c Sugar is a compound that can decompose d Sugar is a mixture 18 When salt dissolves in water, evaporation can separate the components, showing: a They lose properties b They cannot be separated c They retain original properties d They form a new compound 19 Which description best matches a mixture vs. a compound? a Mixtures have new properties; compounds do not b Mixtures retain properties; compounds have new properties c Compounds can be separated physically; mixtures cannot d Mixtures have fixed ratios; compounds vary

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SCIENCE 8 - REVIEW

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SCIENCE 8 - REVIEWVersión en línea

por Christ Ann Jean Jayson

Which scientist's experiment led to the discovery of the nucleus?

Whose idea is a solar-system-like atom model with electrons orbiting the nucleus?

Dalton's idea of indivisible particles is best remembered as being

Who improved Thomson's plum pudding model by showing electrons move around a dense nucleus?

Which scientist is correctly matched with his contribution?

If an atom loses one electron, what is its charge?

Two atoms of the same element with different numbers of neutrons are

Heating sugar to brown and release water vapor and carbon shows

When salt is dissolved in water, evaporation shows

Which experiment led to the discovery of the nucleus in atoms?

Whose model resembles a solar system with electrons orbiting the nucleus?

Dalton’s theory posits atoms are indivisible; which part is remembered?

Which scientist improved Thomson’s model by proving electrons orbit a dense nucleus?

Which pairing is correctly matched to their contribution?

If an atom loses one electron, it becomes:

Two atoms of the same element with different neutrons are called:

Sugar turns brown and produces water vapor and carbon when heated; this shows:

When salt dissolves in water, evaporation can separate the components, showing:

Which description best matches a mixture vs. a compound?