General Chemistry Unit 3 Assessment

What contribution did John Dalton make to atomic theory? 

• He discovered that every atom was positively charged. 
• He discovered that every element consisted of one type of atom that couldn't be divided. 
• He discovered that atoms had nuclei. 
• He discovered that atoms could be divided into smaller parts. 

Tags

NGSS.MS-PS1-1

Rutherford's gold foil experiment provided evidence that...

• negative and positive charges are spread evenly throughout the atom.
• alpha particles have a positive charge.
• gold is not a dense as previously thought.
• there is a dense positively charged nucleus at the center of an atom.

Tags

NGSS.MS-PS1-1

The first person to propose a theory about an atom called the Atomos Theory was

• Democritus
• Rutherford
• Dalton
• Aristotle

How did Thomson build upon Dalton's model?

• His model was the same.

• He put electrons in orbitals.

• He discovered the nucleus.

• He discovered subatomic particles (electron).

How did each model of the atom help to develop the atomic theory? 

• Each model provided opinions that were added.
• Each model showed different properties of the same structure. 
• Each model showed new particles that had been discovered.
• Each model built upon the other to show new particles or properties of previously discovered particles. 

Tags

NGSS.MS-PS1-1

What was the name of the model pictured behind this question?

• Oatmeal Model

• Rutherford Model

• Bohr Model

• Plum Pudding Model

Which of the following are parts of Dalton's theory?

• All substances are made of atoms.

• Atoms join with other atoms to make new substances.

• Atoms of different elements are different

• All of these are part of his theory

Tags

NGSS.HS-PS1-7

When you add the number of protons and neutrons together, you are calculating...

• Atomic Number
• Atomic Mass
• Mass Number
• Pythagorean's Theorem

The average mass of all naturally occurring isotope is also known as ...

• Atomic Number
• Atomic Mass
• Mass Number
• Radioactivity

Tags

NGSS.HS-PS1-1

What is an element that has a different number of neutrons called?

• ion
• isotope
• carbon
• radioactive

Tags

NGSS.HS-PS1-8