CHM 111 Unit 2: Matter and Atomic Theory

Who came up with the first atomic theory?

• Dalton

• Socrates

• Thomas

• Rutherford

What did Rutherford discover about atoms?

• An atom is always negatively charged.

• An atom is mostly empty space, but has a dense positively charged center(nucleus).

• An atom is always positively charged.

• All particles will pass straight through gold foil with no change in path.

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What is a positively charged particle?

• neutron

• electron

• proton

• atom

What is a negatively charged particle?

• neutron

• electron

• proton

• atom

Who proposed a model with electrons moving in specific layers?

• Dalton

• Rutherford

• Bohr

• Thomson

Where are electrons located in an atom?

• Nucleus
• Electron Cloud
• Within a Proton
• Within a Neutron

Which phase of matter has no definite shape or volume?

• Solid

• Liquid

• Gas

• All of the above

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Apple juice is what kind of mixture?

• Homogeneous

• Heterogeneous

A molecule with two or more different atoms is called a:

• Element

• Compound

• Mixture

• Particle

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Which of the following is an example of a heterogeneous mixture?

• A gold bar

• Coffee

• A computer

• Coke