Mid-term for Advanced Review

Who discovered electrons?

• Thomson

• Dalton

• Rutherford

• Chadwick

Which subatomic particles contribute the most to the mass of an atom?

• Protons, Neutrons, Electrons
• Protons only
• Protons and Electrons
• Protons and Neutrons

Who was it that developed the rules of chemical reactions and explained that compounds are produced by different combinations of elements?

• John Dalton

• Isaac Newton

• Galileo Galilei

• Albert Einstein

Tags

NGSS.MS-PS1-5

What is made up of two or more elements that are chemically combined?

• Element

• Mixture

• Compound

• Solids

What cannot be broken down into other substances?

• Compound
• Mixture
• Solids
• Element

A combination of substances that are not chemically combined is called a(n)____________. 

• mixture
• compound
• physical

Which of the following formulae represents an element?

• H₂O
• H₂
• NaCl
• CaCO₃

An element is made up of only one kind of _____.

• isotope
• plastic
• atom
• metal

The positive particles of an atom are 

• electrons 
• positrons 
• neutrons 
• protons 

What does the 1.00794 stand for?

• Hydrogen
• atomic number
• atomic mass
• atomic explosion

Tags

NGSS.MS-PS1-1