Physical Science (pt. 2): properties of matter, mixtures..

The model of the atom where the central core contains protons and neutrons surrounded by a cloud of electrons is best described as...

• The Bohr model of the atom.

• The modern model of the atom.

• The plum pudding model of the atom.

• The solar system model of the atom.

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SC.8.P.8.7

Modern atomic theory states that the atom is a diffuse cloud surrounding a small, dense nucleus. Identify which particle is in the nucleus.

• proton
• photon
• free radical

• electron

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SC.8.P.8.7

Modern atomic theory states that the atom is a diffuse cloud of ________ surrounding a small, dense nucleus.

• protons
• neutrons
• photons
• electrons

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SC.8.P.8.7

Which subatomic particle is involved in a chemical reaction?

• A

• B

• C

• D

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SC.8.P.8.7

Which part of the diagram represents the proton?

• A

• B

• C

• D

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SC.8.P.8.7

Which of these is NOT characteristic of acids?

• Corrosive to metals
• Sour smell
• Bitter taste
• Red litmus paper turns blue

The pH scale runs from 0 to 14, and is an indication of how acidic or basic a solution is. A pH close to zero indicates a(n) _______ solution, and a pH near 14 indicates a(n) _______ solution.

• basic; acidic

• 
  neutral; basic

• acidic; neutral

• acidic, basic

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SC.8.P.8.8

Suzy uses an Italian salad dressing on her lunch. This ____________ mixture is a suspension of oil and vinegar.

• 
  heterogeneous

• 
  heterologous

• homogeneous

• homologous

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SC.8.P.8.9

According to the Law of Conservation of Mass, which box on the right correctly demonstrates the product of this reaction?

• A

• B

• C

• D

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SC.8.P.9.1

Based on the Law of Conservation of Matter, describe the relationship between the mass of the reactants and the mass of the products.

• The mass of the reactants equals the mass of the products.

• The mass of the reactants is less than the mass of the products.

• The mass of the products is always greater than the mass of the reactants.

• The mass of the reactants is greater than the mass of the products; some mass is lost when atoms recombine.

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SC.8.P.9.1