First Quarter Science 7 Re-Test

Who proposed the plum pudding model of atom?

• John Dalton

• J.J. Thomson

• Ernest Rutherford

• Democritus

What resembles the Plum Pudding Model of the atom?

• Tiny, solid ball with negative charges stuck on the outside

• A complex mathematical equation describing electron behavior.

• A miniature solar system with planets orbiting a central nucleus.

• A positively charged sphere with negatively charges scattered throughout.

Why do scientists use models?

• They are exact representations of reality.

• They only exist in computer simulations.

• They are always simple and easy to understand.

• They can be used to test ideas and make predictions.

Which of the following CAN NOT be a scientific model for the atom?

• A song with lyrics full of subatomic particles and their charges.

• An image (picture, concept map, flowchart, etc.) that considers all laws of science.

• A round Styrofoam colored with parts representing electrons and other subatomic particles.

• A computerized interactive game where you can put subatomic particles and guess the correct image for atom.

Which of the following shows an electron cloud model of atom according to quantum mechanics?

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Who formulated the Atomic Theory of Matter and supports Democritus’ theory which states that matter is made up of an atom that is a tiny indestructible sphere with mass.

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What do you call the smallest particle of matter having its own kind of properties that set it apart from other particles?

• Element

• Compound

• Nucleon

• Ion

Chemical formula were used by scientists and chemists to describe the elements present in a certain compound. What do you call the chemical formula of table salt?

• S

• H₂O

• NaCa

• NaCl

Matter is made up of tiny particles that are constantly moving. There are spaces between particles and they attract each other. Which of the following elements will form a compound of water?

• two atoms of Hydrogen and one atom of oxygen

• two atoms of Hydrogen and two atoms of Oxygen

• one atom of Sodium and one atom of Chlorine

• one atom of Carbon and two atoms of Oxygen

Which of the following statement is NOT TRUE about the particle of water?

• the smallest particle of water is called molecule

• water molecule is made up of two atoms of hydrogen and an atom of oxygen

• water molecule can split into hydrogen and oxygen by electrolysis

• water molecule is attracted to magnet